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Message-ID: <edef9f69-4b29-4c00-8c1a-67c4b8f36af0@suse.cz>
Date: Thu, 29 Sep 2022 15:24:22 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: syzbot <syzbot+dfcc5f4da15868df7d4d@...kaller.appspotmail.com>,
akpm@...ux-foundation.org, keescook@...omium.org,
linux-kernel@...r.kernel.org, mark.rutland@....com,
mhiramat@...nel.org, rostedt@...dmis.org,
syzkaller-bugs@...glegroups.com
Cc: "linux-mm@...ck.org" <linux-mm@...ck.org>,
Michal Hocko <mhocko@...e.com>, Jan Kara <jack@...e.cz>,
Amir Goldstein <amir73il@...il.com>,
Matthew Bobrowski <repnop@...gle.com>,
Linux-FSDevel <linux-fsdevel@...r.kernel.org>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Matthew Wilcox <willy@...radead.org>
Subject: Re: [syzbot] inconsistent lock state in kmem_cache_alloc
On 9/26/22 18:33, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 105a36f3694e Merge tag 'kbuild-fixes-v6.0-3' of git://git...
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=152bf540880000
> kernel config: https://syzkaller.appspot.com/x/.config?x=7db7ad17eb14cb7
> dashboard link: https://syzkaller.appspot.com/bug?extid=dfcc5f4da15868df7d4d
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1020566c880000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=104819e4880000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+dfcc5f4da15868df7d4d@...kaller.appspotmail.com
+CC more folks
I'm not fully sure what this report means but I assume it's because there's
a GFP_KERNEL kmalloc() allocation from softirq context? Should it perhaps
use memalloc_nofs_save() at some well defined point?
> ================================
> WARNING: inconsistent lock state
> 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0 Not tainted
> --------------------------------
> inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
> swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
> ffffffff8c0be7e0 (fs_reclaim){+.?.}-{0:0}, at: might_alloc include/linux/sched/mm.h:271 [inline]
> ffffffff8c0be7e0 (fs_reclaim){+.?.}-{0:0}, at: slab_pre_alloc_hook mm/slab.h:700 [inline]
> ffffffff8c0be7e0 (fs_reclaim){+.?.}-{0:0}, at: slab_alloc mm/slab.c:3278 [inline]
> ffffffff8c0be7e0 (fs_reclaim){+.?.}-{0:0}, at: __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
> ffffffff8c0be7e0 (fs_reclaim){+.?.}-{0:0}, at: kmem_cache_alloc+0x39/0x520 mm/slab.c:3491
> {SOFTIRQ-ON-W} state was registered at:
> lock_acquire kernel/locking/lockdep.c:5666 [inline]
> lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
> __fs_reclaim_acquire mm/page_alloc.c:4674 [inline]
> fs_reclaim_acquire+0x115/0x160 mm/page_alloc.c:4688
> might_alloc include/linux/sched/mm.h:271 [inline]
> slab_pre_alloc_hook mm/slab.h:700 [inline]
> slab_alloc mm/slab.c:3278 [inline]
> kmem_cache_alloc_trace+0x38/0x460 mm/slab.c:3557
> kmalloc include/linux/slab.h:600 [inline]
> kzalloc include/linux/slab.h:733 [inline]
> alloc_workqueue_attrs+0x39/0xc0 kernel/workqueue.c:3394
> wq_numa_init kernel/workqueue.c:5964 [inline]
> workqueue_init+0x12f/0x8ae kernel/workqueue.c:6091
> kernel_init_freeable+0x3fb/0x73a init/main.c:1607
> kernel_init+0x1a/0x1d0 init/main.c:1512
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
> irq event stamp: 96654
> hardirqs last enabled at (96654): [<ffffffff81c6581b>] kfree+0x25b/0x390 mm/slab.c:3787
> hardirqs last disabled at (96653): [<ffffffff81c65811>] kfree+0x251/0x390 mm/slab.c:3776
> softirqs last enabled at (96624): [<ffffffff814841f3>] invoke_softirq kernel/softirq.c:445 [inline]
> softirqs last enabled at (96624): [<ffffffff814841f3>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
> softirqs last disabled at (96649): [<ffffffff814841f3>] invoke_softirq kernel/softirq.c:445 [inline]
> softirqs last disabled at (96649): [<ffffffff814841f3>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
>
> other info that might help us debug this:
> Possible unsafe locking scenario:
>
> CPU0
> ----
> lock(fs_reclaim);
> <Interrupt>
> lock(fs_reclaim);
>
> *** DEADLOCK ***
>
> 1 lock held by swapper/1/0:
> #0: ffffffff91227508 (&fsnotify_mark_srcu){....}-{0:0}, at: fsnotify+0x2f4/0x1680 fs/notify/fsnotify.c:544
>
> stack backtrace:
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> print_usage_bug kernel/locking/lockdep.c:3961 [inline]
> valid_state kernel/locking/lockdep.c:3973 [inline]
> mark_lock_irq kernel/locking/lockdep.c:4176 [inline]
> mark_lock.part.0.cold+0x18/0xd8 kernel/locking/lockdep.c:4632
> mark_lock kernel/locking/lockdep.c:4596 [inline]
> mark_usage kernel/locking/lockdep.c:4527 [inline]
> __lock_acquire+0x11d9/0x56d0 kernel/locking/lockdep.c:5007
> lock_acquire kernel/locking/lockdep.c:5666 [inline]
> lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
> __fs_reclaim_acquire mm/page_alloc.c:4674 [inline]
> fs_reclaim_acquire+0x115/0x160 mm/page_alloc.c:4688
> might_alloc include/linux/sched/mm.h:271 [inline]
> slab_pre_alloc_hook mm/slab.h:700 [inline]
> slab_alloc mm/slab.c:3278 [inline]
> __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
> kmem_cache_alloc+0x39/0x520 mm/slab.c:3491
> fanotify_alloc_fid_event fs/notify/fanotify/fanotify.c:580 [inline]
> fanotify_alloc_event fs/notify/fanotify/fanotify.c:813 [inline]
> fanotify_handle_event+0x1130/0x3f40 fs/notify/fanotify/fanotify.c:948
> send_to_group fs/notify/fsnotify.c:360 [inline]
> fsnotify+0xafb/0x1680 fs/notify/fsnotify.c:570
> __fsnotify_parent+0x62f/0xa60 fs/notify/fsnotify.c:230
> fsnotify_parent include/linux/fsnotify.h:77 [inline]
> fsnotify_file include/linux/fsnotify.h:99 [inline]
> fsnotify_access include/linux/fsnotify.h:309 [inline]
> __io_complete_rw_common+0x485/0x720 io_uring/rw.c:195
> io_complete_rw+0x1a/0x1f0 io_uring/rw.c:228
> iomap_dio_complete_work fs/iomap/direct-io.c:144 [inline]
> iomap_dio_bio_end_io+0x438/0x5e0 fs/iomap/direct-io.c:178
> bio_endio+0x5f9/0x780 block/bio.c:1564
> req_bio_endio block/blk-mq.c:695 [inline]
> blk_update_request+0x3fc/0x1300 block/blk-mq.c:825
> scsi_end_request+0x7a/0x9a0 drivers/scsi/scsi_lib.c:541
> scsi_io_completion+0x173/0x1f70 drivers/scsi/scsi_lib.c:971
> scsi_complete+0x122/0x3b0 drivers/scsi/scsi_lib.c:1438
> blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1022
> __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
> invoke_softirq kernel/softirq.c:445 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
> common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240
> </IRQ>
> <TASK>
> asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
> RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
> RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
> RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
> RIP: 0010:acpi_safe_halt+0x6f/0xb0 drivers/acpi/processor_idle.c:113
> Code: f7 84 db 74 06 5b e9 a0 26 f8 f7 e8 9b 26 f8 f7 e8 f6 9d fe f7 66 90 e8 8f 26 f8 f7 0f 00 2d c8 a5 d1 00 e8 83 26 f8 f7 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 4e 23 f8 f7 48 85 db
> RSP: 0018:ffffc9000038fd20 EFLAGS: 00000293
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: ffff8880121f0200 RSI: ffffffff8983119d RDI: 0000000000000000
> RBP: ffff8880178c9064 R08: 0000000000000001 R09: 0000000000000001
> R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
> R13: 0000000000000001 R14: ffff8880178c9000 R15: ffff888146aa7804
> acpi_idle_do_entry drivers/acpi/processor_idle.c:555 [inline]
> acpi_idle_enter+0x524/0x6a0 drivers/acpi/processor_idle.c:692
> cpuidle_enter_state+0x1ab/0xd30 drivers/cpuidle/cpuidle.c:239
> cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:356
> call_cpuidle kernel/sched/idle.c:155 [inline]
> cpuidle_idle_call kernel/sched/idle.c:236 [inline]
> do_idle+0x3e8/0x590 kernel/sched/idle.c:303
> cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
> start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262
> secondary_startup_64_no_verify+0xce/0xdb
> </TASK>
> BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/1
> preempt_count: 101, expected: 0
> RCU nest depth: 0, expected: 0
> INFO: lockdep is turned off.
> Preemption disabled at:
> [<0000000000000000>] 0x0
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> __might_resched.cold+0x222/0x26b kernel/sched/core.c:9892
> might_alloc include/linux/sched/mm.h:274 [inline]
> slab_pre_alloc_hook mm/slab.h:700 [inline]
> slab_alloc mm/slab.c:3278 [inline]
> __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
> kmem_cache_alloc+0x381/0x520 mm/slab.c:3491
> fanotify_alloc_fid_event fs/notify/fanotify/fanotify.c:580 [inline]
> fanotify_alloc_event fs/notify/fanotify/fanotify.c:813 [inline]
> fanotify_handle_event+0x1130/0x3f40 fs/notify/fanotify/fanotify.c:948
> send_to_group fs/notify/fsnotify.c:360 [inline]
> fsnotify+0xafb/0x1680 fs/notify/fsnotify.c:570
> __fsnotify_parent+0x62f/0xa60 fs/notify/fsnotify.c:230
> fsnotify_parent include/linux/fsnotify.h:77 [inline]
> fsnotify_file include/linux/fsnotify.h:99 [inline]
> fsnotify_access include/linux/fsnotify.h:309 [inline]
> __io_complete_rw_common+0x485/0x720 io_uring/rw.c:195
> io_complete_rw+0x1a/0x1f0 io_uring/rw.c:228
> iomap_dio_complete_work fs/iomap/direct-io.c:144 [inline]
> iomap_dio_bio_end_io+0x438/0x5e0 fs/iomap/direct-io.c:178
> bio_endio+0x5f9/0x780 block/bio.c:1564
> req_bio_endio block/blk-mq.c:695 [inline]
> blk_update_request+0x3fc/0x1300 block/blk-mq.c:825
> scsi_end_request+0x7a/0x9a0 drivers/scsi/scsi_lib.c:541
> scsi_io_completion+0x173/0x1f70 drivers/scsi/scsi_lib.c:971
> scsi_complete+0x122/0x3b0 drivers/scsi/scsi_lib.c:1438
> blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1022
> __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
> invoke_softirq kernel/softirq.c:445 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
> common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240
> </IRQ>
> <TASK>
> asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
> RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
> RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
> RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
> RIP: 0010:acpi_safe_halt+0x6f/0xb0 drivers/acpi/processor_idle.c:113
> Code: f7 84 db 74 06 5b e9 a0 26 f8 f7 e8 9b 26 f8 f7 e8 f6 9d fe f7 66 90 e8 8f 26 f8 f7 0f 00 2d c8 a5 d1 00 e8 83 26 f8 f7 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 4e 23 f8 f7 48 85 db
> RSP: 0018:ffffc9000038fd20 EFLAGS: 00000293
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: ffff8880121f0200 RSI: ffffffff8983119d RDI: 0000000000000000
> RBP: ffff8880178c9064 R08: 0000000000000001 R09: 0000000000000001
> R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
> R13: 0000000000000001 R14: ffff8880178c9000 R15: ffff888146aa7804
> acpi_idle_do_entry drivers/acpi/processor_idle.c:555 [inline]
> acpi_idle_enter+0x524/0x6a0 drivers/acpi/processor_idle.c:692
> cpuidle_enter_state+0x1ab/0xd30 drivers/cpuidle/cpuidle.c:239
> cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:356
> call_cpuidle kernel/sched/idle.c:155 [inline]
> cpuidle_idle_call kernel/sched/idle.c:236 [inline]
> do_idle+0x3e8/0x590 kernel/sched/idle.c:303
> cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
> start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262
> secondary_startup_64_no_verify+0xce/0xdb
> </TASK>
> BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3675, name: syz-executor284
> preempt_count: 100, expected: 0
> RCU nest depth: 0, expected: 0
> INFO: lockdep is turned off.
> Preemption disabled at:
> [<ffffffff89c000e1>] softirq_handle_begin kernel/softirq.c:409 [inline]
> [<ffffffff89c000e1>] __do_softirq+0xe1/0x9c6 kernel/softirq.c:547
> CPU: 1 PID: 3675 Comm: syz-executor284 Tainted: G W 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> __might_resched.cold+0x222/0x26b kernel/sched/core.c:9892
> might_alloc include/linux/sched/mm.h:274 [inline]
> slab_pre_alloc_hook mm/slab.h:700 [inline]
> slab_alloc mm/slab.c:3278 [inline]
> __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
> kmem_cache_alloc+0x381/0x520 mm/slab.c:3491
> fanotify_alloc_fid_event fs/notify/fanotify/fanotify.c:580 [inline]
> fanotify_alloc_event fs/notify/fanotify/fanotify.c:813 [inline]
> fanotify_handle_event+0x1130/0x3f40 fs/notify/fanotify/fanotify.c:948
> send_to_group fs/notify/fsnotify.c:360 [inline]
> fsnotify+0xafb/0x1680 fs/notify/fsnotify.c:570
> __fsnotify_parent+0x62f/0xa60 fs/notify/fsnotify.c:230
> fsnotify_parent include/linux/fsnotify.h:77 [inline]
> fsnotify_file include/linux/fsnotify.h:99 [inline]
> fsnotify_access include/linux/fsnotify.h:309 [inline]
> __io_complete_rw_common+0x485/0x720 io_uring/rw.c:195
> io_complete_rw+0x1a/0x1f0 io_uring/rw.c:228
> iomap_dio_complete_work fs/iomap/direct-io.c:144 [inline]
> iomap_dio_bio_end_io+0x438/0x5e0 fs/iomap/direct-io.c:178
> bio_endio+0x5f9/0x780 block/bio.c:1564
> req_bio_endio block/blk-mq.c:695 [inline]
> blk_update_request+0x3fc/0x1300 block/blk-mq.c:825
> scsi_end_request+0x7a/0x9a0 drivers/scsi/scsi_lib.c:541
> scsi_io_completion+0x173/0x1f70 drivers/scsi/scsi_lib.c:971
> scsi_complete+0x122/0x3b0 drivers/scsi/scsi_lib.c:1438
> blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1022
> __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
> invoke_softirq kernel/softirq.c:445 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
> common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240
> </IRQ>
> <TASK>
> asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
> RIP: 0010:kmem_cache_free.part.0+0x141/0x2e0 mm/slab.c:3727
> Code: 4c 89 ea 4c 89 e7 e8 ee c0 ff ff 48 85 db 0f 85 a3 00 00 00 9c 58 f6 c4 02 0f 85 7e 01 00 00 48 85 db 74 01 fb 48 8b 44 24 08 <65> 48 2b 04 25 28 00 00 00 0f 85 7c 01 00 00 48 83 c4 10 5b 5d 41
> RSP: 0018:ffffc90002f578a0 EFLAGS: 00000206
> RAX: 90e611cb37c35f00 RBX: 0000000000000200 RCX: 1ffffffff1bbcead
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81c691b3
> RBP: ffffea0001f3fe40 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000080000000 R11: 000000000008c07c R12: ffff888011853000
> R13: ffffffff8136bf10 R14: ffff88807cf5e8a8 R15: 00007f457e2d9000
> pmd_ptlock_free include/linux/mm.h:2355 [inline]
> pgtable_pmd_page_dtor include/linux/mm.h:2392 [inline]
> ___pmd_free_tlb+0x70/0x220 arch/x86/mm/pgtable.c:72
> __pmd_free_tlb arch/x86/include/asm/pgalloc.h:93 [inline]
> free_pmd_range mm/memory.c:269 [inline]
> free_pud_range mm/memory.c:287 [inline]
> free_p4d_range mm/memory.c:321 [inline]
> free_pgd_range+0x9a1/0xbe0 mm/memory.c:401
> free_pgtables+0x230/0x2f0 mm/memory.c:433
> exit_mmap+0x1c7/0x490 mm/mmap.c:3117
> __mmput+0x122/0x4b0 kernel/fork.c:1187
> mmput+0x56/0x60 kernel/fork.c:1208
> exit_mm kernel/exit.c:510 [inline]
> do_exit+0x9e2/0x29b0 kernel/exit.c:782
> do_group_exit+0xd2/0x2f0 kernel/exit.c:925
> get_signal+0x238c/0x2610 kernel/signal.c:2857
> arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869
> exit_to_user_mode_loop kernel/entry/common.c:166 [inline]
> exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201
> __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
> syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
> do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f457e24abe9
> Code: Unable to access opcode bytes at RIP 0x7f457e24abbf.
> RSP: 002b:00007f457e1fc308 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> RAX: fffffffffffffe00 RBX: 00007f457e2d2428 RCX: 00007f457e24abe9
> RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f457e2d2428
> RBP: 00007f457e2d2420 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f457e2a0064
> R13: 0000000000000004 R14: 00007f457e1fc400 R15: 0000000000022000
> </TASK>
> BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3603, name: strace-static-x
> preempt_count: 100, expected: 0
> RCU nest depth: 0, expected: 0
> INFO: lockdep is turned off.
> Preemption disabled at:
> [<ffffffff89c000e1>] softirq_handle_begin kernel/softirq.c:409 [inline]
> [<ffffffff89c000e1>] __do_softirq+0xe1/0x9c6 kernel/softirq.c:547
> CPU: 1 PID: 3603 Comm: strace-static-x Tainted: G W 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
> Call Trace:
> <TASK>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> __might_resched.cold+0x222/0x26b kernel/sched/core.c:9892
> might_alloc include/linux/sched/mm.h:274 [inline]
> slab_pre_alloc_hook mm/slab.h:700 [inline]
> slab_alloc mm/slab.c:3278 [inline]
> __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
> kmem_cache_alloc+0x381/0x520 mm/slab.c:3491
> fanotify_alloc_fid_event fs/notify/fanotify/fanotify.c:580 [inline]
> fanotify_alloc_event fs/notify/fanotify/fanotify.c:813 [inline]
> fanotify_handle_event+0x1130/0x3f40 fs/notify/fanotify/fanotify.c:948
> send_to_group fs/notify/fsnotify.c:360 [inline]
> fsnotify+0xafb/0x1680 fs/notify/fsnotify.c:570
> __fsnotify_parent+0x62f/0xa60 fs/notify/fsnotify.c:230
> fsnotify_parent include/linux/fsnotify.h:77 [inline]
> fsnotify_file include/linux/fsnotify.h:99 [inline]
> fsnotify_access include/linux/fsnotify.h:309 [inline]
> __io_complete_rw_common+0x485/0x720 io_uring/rw.c:195
> io_complete_rw+0x1a/0x1f0 io_uring/rw.c:228
> iomap_dio_complete_work fs/iomap/direct-io.c:144 [inline]
> iomap_dio_bio_end_io+0x438/0x5e0 fs/iomap/direct-io.c:178
> bio_endio+0x5f9/0x780 block/bio.c:1564
> req_bio_endio block/blk-mq.c:695 [inline]
> blk_update_request+0x3fc/0x1300 block/blk-mq.c:825
> scsi_end_request+0x7a/0x9a0 drivers/scsi/scsi_lib.c:541
> scsi_io_completion+0x173/0x1f70 drivers/scsi/scsi_lib.c:971
> scsi_complete+0x122/0x3b0 drivers/scsi/scsi_lib.c:1438
> blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1022
> __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
> invoke_softirq kernel/softirq.c:445 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
> common_interrupt+0x52/0xc0 arch/x86/kernel/irq.c:240
> asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
> RIP: 0033:0x485e00
> Code: 0f 86 de 17 00 00 48 89 8d 08 fb ff ff 48 89 ca 4c 89 d6 4c 89 e7 44 89 8d 00 fb ff ff ff 53 38 48 8b 8d 08 fb ff ff 48 39 c1 <0f> 85 92 f5 ff ff 44 8b 8d 00 fb ff ff b8 ff ff ff 7f 44 29 c8 48
> RSP: 002b:00007fff73e2c5f0 EFLAGS: 00000246
> RAX: 0000000000000001 RBX: 0000000000619460 RCX: 0000000000000001
> RDX: 0000000000000001 RSI: 00007fff73e2cb07 RDI: 0000000000989041
> RBP: 00007fff73e2cb40 R08: 0000000000000000 R09: 0000000000000000
> R10: 00007fff73e2cb07 R11: 0000000000000000 R12: 0000000000617480
> R13: 0000000000534349 R14: 00007fff73e2cb58 R15: 0000000000000064
> </TASK>
> BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/1
> preempt_count: 102, expected: 0
> RCU nest depth: 0, expected: 0
> INFO: lockdep is turned off.
> Preemption disabled at:
> [<0000000000000000>] 0x0
> CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> __might_resched.cold+0x222/0x26b kernel/sched/core.c:9892
> might_alloc include/linux/sched/mm.h:274 [inline]
> slab_pre_alloc_hook mm/slab.h:700 [inline]
> slab_alloc mm/slab.c:3278 [inline]
> __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
> kmem_cache_alloc+0x381/0x520 mm/slab.c:3491
> fanotify_alloc_fid_event fs/notify/fanotify/fanotify.c:580 [inline]
> fanotify_alloc_event fs/notify/fanotify/fanotify.c:813 [inline]
> fanotify_handle_event+0x1130/0x3f40 fs/notify/fanotify/fanotify.c:948
> send_to_group fs/notify/fsnotify.c:360 [inline]
> fsnotify+0xafb/0x1680 fs/notify/fsnotify.c:570
> __fsnotify_parent+0x62f/0xa60 fs/notify/fsnotify.c:230
> fsnotify_parent include/linux/fsnotify.h:77 [inline]
> fsnotify_file include/linux/fsnotify.h:99 [inline]
> fsnotify_access include/linux/fsnotify.h:309 [inline]
> __io_complete_rw_common+0x485/0x720 io_uring/rw.c:195
> io_complete_rw+0x1a/0x1f0 io_uring/rw.c:228
> iomap_dio_complete_work fs/iomap/direct-io.c:144 [inline]
> iomap_dio_bio_end_io+0x438/0x5e0 fs/iomap/direct-io.c:178
> bio_endio+0x5f9/0x780 block/bio.c:1564
> req_bio_endio block/blk-mq.c:695 [inline]
> blk_update_request+0x3fc/0x1300 block/blk-mq.c:825
> scsi_end_request+0x7a/0x9a0 drivers/scsi/scsi_lib.c:541
> scsi_io_completion+0x173/0x1f70 drivers/scsi/scsi_lib.c:971
> scsi_complete+0x122/0x3b0 drivers/scsi/scsi_lib.c:1438
> blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1022
> __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
> invoke_softirq kernel/softirq.c:445 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
> common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240
> </IRQ>
> <TASK>
> asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
> RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline]
> RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:52
> Code: 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01
> RSP: 0018:ffffc9000038f840 EFLAGS: 00000a03
> RAX: 1ffffffff1bda94f RBX: ffffffff8ded4a7c RCX: ffffffff81595532
> RDX: 0000000000000000 RSI: ffffffff8e5f3a12 RDI: ffffffff8ded4a6c
> RBP: ffffffff8ded4a6c R08: ffffffff8be023e0 R09: ffffc9000038f92c
> R10: fffff52000071f2a R11: 000000000008c07c R12: ffffffff8ded4a8c
> R13: ffffffff8ded4a6c R14: ffffffff8ded4a6c R15: dffffc0000000000
> orc_find arch/x86/kernel/unwind_orc.c:178 [inline]
> unwind_next_frame+0x2a3/0x1cc0 arch/x86/kernel/unwind_orc.c:448
> arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
> stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
> kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
> __kasan_record_aux_stack+0x7e/0x90 mm/kasan/generic.c:348
> call_rcu+0x99/0x790 kernel/rcu/tree.c:2793
> put_task_struct_rcu_user+0x7f/0xb0 kernel/exit.c:183
> context_switch kernel/sched/core.c:5185 [inline]
> __schedule+0xae7/0x52b0 kernel/sched/core.c:6494
> schedule_idle+0x57/0x90 kernel/sched/core.c:6598
> do_idle+0x303/0x590 kernel/sched/idle.c:331
> cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
> start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262
> secondary_startup_64_no_verify+0xce/0xdb
> </TASK>
> BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/1
> preempt_count: 101, expected: 0
> RCU nest depth: 0, expected: 0
> INFO: lockdep is turned off.
> Preemption disabled at:
> [<0000000000000000>] 0x0
> CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:88 [inline]
> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
> __might_resched.cold+0x222/0x26b kernel/sched/core.c:9892
> might_alloc include/linux/sched/mm.h:274 [inline]
> slab_pre_alloc_hook mm/slab.h:700 [inline]
> slab_alloc mm/slab.c:3278 [inline]
> __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
> kmem_cache_alloc+0x381/0x520 mm/slab.c:3491
> fanotify_alloc_fid_event fs/notify/fanotify/fanotify.c:580 [inline]
> fanotify_alloc_event fs/notify/fanotify/fanotify.c:813 [inline]
> fanotify_handle_event+0x1130/0x3f40 fs/notify/fanotify/fanotify.c:948
> send_to_group fs/notify/fsnotify.c:360 [inline]
> fsnotify+0xafb/0x1680 fs/notify/fsnotify.c:570
> __fsnotify_parent+0x62f/0xa60 fs/notify/fsnotify.c:230
> fsnotify_parent include/linux/fsnotify.h:77 [inline]
> fsnotify_file include/linux/fsnotify.h:99 [inline]
> fsnotify_access include/linux/fsnotify.h:309 [inline]
> __io_complete_rw_common+0x485/0x720 io_uring/rw.c:195
> io_complete_rw+0x1a/0x1f0 io_uring/rw.c:228
> iomap_dio_complete_work fs/iomap/direct-io.c:144 [inline]
> iomap_dio_bio_end_io+0x438/0x5e0 fs/iomap/direct-io.c:178
> bio_endio+0x5f9/0x780 block/bio.c:1564
> req_bio_endio block/blk-mq.c:695 [inline]
> blk_update_request+0x3fc/0x1300 block/blk-mq.c:825
> scsi_end_request+0x7a/0x9a0 drivers/scsi/scsi_lib.c:541
> scsi_io_completion+0x173/0x1f70 drivers/scsi/scsi_lib.c:971
> scsi_complete+0x122/0x3b0 drivers/scsi/scsi_lib.c:1438
> blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1022
> __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
> invoke_softirq kernel/softirq.c:445 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
> common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240
> </IRQ>
> <TASK>
> asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
> RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
> RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
> RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
> RIP: 0010:acpi_safe_halt+0x6f/0xb0 drivers/acpi/processor_idle.c:113
> Code: f7 84 db 74 06 5b e9 a0 26 f8 f7 e8 9b 26 f8 f7 e8 f6 9d fe f7 66 90 e8 8f 26 f8 f7 0f 00 2d c8 a5 d1 00 e8 83 26 f8 f7 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 4e 23 f8 f7 48 85 db
> RSP: 0018:ffffc9000038fd20 EFLAGS: 00000293
> RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> RDX: ffff8880121f0200 RSI: ffffffff8983119d RDI: ffffffff8983118a
> RBP: ffff8880178c9064 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
> R13: 0000000000000001 R14: ffff8880178c9000 R15: ffff888146aa7804
> acpi_idle_do_entry drivers/acpi/processor_idle.c:555 [inline]
> acpi_idle_enter+0x524/0x6a0 drivers/acpi/processor_idle.c:692
> cpuidle_enter_state+0x1ab/0xd30 drivers/cpuidle/cpuidle.c:239
> cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:356
> call_cpuidle kernel/sched/idle.c:155 [inline]
> cpuidle_idle_call kernel/sched/idle.c:236 [inline]
> do_idle+0x3e8/0x590 kernel/sched/idle.c:303
> cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
> start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:262
> secondary_startup_64_no_verify+0xce/0xdb
> </TASK>
> ------------[ cut here ]------------
> do not call blocking ops when !TASK_RUNNING; state=8 set at [<ffffffff814ad360>] ptrace_stop.part.0+0x0/0xa80 kernel/signal.c:2172
> WARNING: CPU: 1 PID: 3606 at kernel/sched/core.c:9815 __might_sleep+0x105/0x150 kernel/sched/core.c:9815
> Modules linked in:
> CPU: 1 PID: 3606 Comm: syz-executor284 Tainted: G W 6.0.0-rc6-syzkaller-00321-g105a36f3694e #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
> RIP: 0010:__might_sleep+0x105/0x150 kernel/sched/core.c:9815
> Code: 6f 02 00 48 8d bb 08 17 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 34 48 8b 93 08 17 00 00 48 c7 c7 00 1e ec 89 e8 7d c6 e8 07 <0f> 0b e9 75 ff ff ff e8 cf d5 74 00 e9 26 ff ff ff 89 34 24 e8 d2
> RSP: 0018:ffffc900003f8810 EFLAGS: 00010286
> RAX: 0000000000000000 RBX: ffff88807dd3c080 RCX: 0000000000000000
> RDX: ffff88807dd3c080 RSI: ffffffff81611da8 RDI: fffff5200007f0f4
> RBP: ffffffff8b840617 R08: 0000000000000005 R09: 0000000000000000
> R10: 0000000080000102 R11: 6320746f6e206f64 R12: 0000000000000112
> R13: 0000000000404cc0 R14: 0000000000000048 R15: 0000000000000200
> FS: 0000555555731300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000010 CR3: 00000000743dd000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <IRQ>
> might_alloc include/linux/sched/mm.h:274 [inline]
> slab_pre_alloc_hook mm/slab.h:700 [inline]
> slab_alloc mm/slab.c:3278 [inline]
> __kmem_cache_alloc_lru mm/slab.c:3471 [inline]
> kmem_cache_alloc+0x381/0x520 mm/slab.c:3491
> fanotify_alloc_fid_event fs/notify/fanotify/fanotify.c:580 [inline]
> fanotify_alloc_event fs/notify/fanotify/fanotify.c:813 [inline]
> fanotify_handle_event+0x1130/0x3f40 fs/notify/fanotify/fanotify.c:948
> send_to_group fs/notify/fsnotify.c:360 [inline]
> fsnotify+0xafb/0x1680 fs/notify/fsnotify.c:570
> __fsnotify_parent+0x62f/0xa60 fs/notify/fsnotify.c:230
> fsnotify_parent include/linux/fsnotify.h:77 [inline]
> fsnotify_file include/linux/fsnotify.h:99 [inline]
> fsnotify_access include/linux/fsnotify.h:309 [inline]
> __io_complete_rw_common+0x485/0x720 io_uring/rw.c:195
> io_complete_rw+0x1a/0x1f0 io_uring/rw.c:228
> iomap_dio_complete_work fs/iomap/direct-io.c:144 [inline]
> iomap_dio_bio_end_io+0x438/0x5e0 fs/iomap/direct-io.c:178
> bio_endio+0x5f9/0x780 block/bio.c:1564
> req_bio_endio block/blk-mq.c:695 [inline]
> blk_update_request+0x3fc/0x1300 block/blk-mq.c:825
> scsi_end_request+0x7a/0x9a0 drivers/scsi/scsi_lib.c:541
> scsi_io_completion+0x173/0x1f70 drivers/scsi/scsi_lib.c:971
> scsi_complete+0x122/0x3b0 drivers/scsi/scsi_lib.c:1438
> blk_complete_reqs+0xad/0xe0 block/blk-mq.c:1022
> __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
> invoke_softirq kernel/softirq.c:445 [inline]
> __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
> irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
> common_interrupt+0xa9/0xc0 arch/x86/kernel/irq.c:240
> </IRQ>
> <TASK>
> asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640
> RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
> RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
> Code: 74 24 10 e8 5a 76 db f7 48 89 ef e8 e2 f7 db f7 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 23 b9 ce f7 65 8b 05 ac 45 7f 76 85 c0 74 0a 5b 5d c3 e8 e0 85
> RSP: 0018:ffffc90003067c88 EFLAGS: 00000206
> RAX: 0000000000000046 RBX: 0000000000000200 RCX: 1ffffffff1bbcead
> RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
> RBP: ffff888026549640 R08: 0000000000000000 R09: 0000000000000000
> R10: ffffed1004ca92c8 R11: 0000000000000001 R12: ffff88807e924040
> R13: ffff888026549640 R14: ffffc90003067d20 R15: 0000000000000246
> spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
> do_notify_parent_cldstop+0x569/0xa40 kernel/signal.c:2190
> ptrace_stop.part.0+0x834/0xa80 kernel/signal.c:2293
> ptrace_stop kernel/signal.c:2232 [inline]
> ptrace_do_notify+0x215/0x2b0 kernel/signal.c:2344
> ptrace_notify+0xc4/0x140 kernel/signal.c:2356
> ptrace_report_syscall include/linux/ptrace.h:420 [inline]
> ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline]
> syscall_exit_work kernel/entry/common.c:249 [inline]
> syscall_exit_to_user_mode_prepare+0x129/0x280 kernel/entry/common.c:276
> __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline]
> syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294
> do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
> entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f457e2494f6
> Code: 0f 1f 40 00 31 c9 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 49 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 14 48 89 74 24
> RSP: 002b:00007ffd6ecf35c8 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
> RAX: 0000000000000000 RBX: 000000000000d707 RCX: 00007f457e2494f6
> RDX: 0000000040000001 RSI: 00007ffd6ecf35f4 RDI: 00000000ffffffff
> RBP: 0000000000000f02 R08: 0000000000000037 R09: 00007ffd6ed54080
> R10: 0000000000000000 R11: 0000000000000246 R12: 431bde82d7b634db
> R13: 00007ffd6ecf35f4 R14: 0000000000000000 R15: 0000000000000000
> </TASK>
> ----------------
> Code disassembly (best guess):
> 0: f7 84 db 74 06 5b e9 testl $0xf7f826a0,-0x16a4f98c(%rbx,%rbx,8)
> 7: a0 26 f8 f7
> b: e8 9b 26 f8 f7 callq 0xf7f826ab
> 10: e8 f6 9d fe f7 callq 0xf7fe9e0b
> 15: 66 90 xchg %ax,%ax
> 17: e8 8f 26 f8 f7 callq 0xf7f826ab
> 1c: 0f 00 2d c8 a5 d1 00 verw 0xd1a5c8(%rip) # 0xd1a5eb
> 23: e8 83 26 f8 f7 callq 0xf7f826ab
> 28: fb sti
> 29: f4 hlt
> * 2a: 9c pushfq <-- trapping instruction
> 2b: 5b pop %rbx
> 2c: 81 e3 00 02 00 00 and $0x200,%ebx
> 32: fa cli
> 33: 31 ff xor %edi,%edi
> 35: 48 89 de mov %rbx,%rsi
> 38: e8 4e 23 f8 f7 callq 0xf7f8238b
> 3d: 48 85 db test %rbx,%rbx
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
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