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Message-ID: <20250709215135.3122-1-hdanton@sina.com>
Date: Thu, 10 Jul 2025 05:51:34 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+3470c9ffee63e4abafeb@...kaller.appspotmail.com>
Cc: Dave Chinner <david@...morbit.com>,
Alexander Potapenko <glider@...gle.com>,
cem@...nel.org,
linux-kernel@...r.kernel.org,
linux-xfs@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [xfs?] possible deadlock in xfs_ilock_attr_map_shared (2)
> Date: Wed, 09 Jul 2025 10:39:29 -0700
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 733923397fd9 Merge tag 'pwm/for-6.16-rc6-fixes' of git://g..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13f53582580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b309c907eaab29da
> dashboard link: https://syzkaller.appspot.com/bug?extid=3470c9ffee63e4abafeb
> compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-73392339.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/be7feaa77b8c/vmlinux-73392339.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/a663b3e31463/bzImage-73392339.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+3470c9ffee63e4abafeb@...kaller.appspotmail.com
>
> ======================================================
> WARNING: possible circular locking dependency detected
> 6.16.0-rc5-syzkaller-00038-g733923397fd9 #0 Not tainted
> ------------------------------------------------------
> syz.0.0/5339 is trying to acquire lock:
> ffffffff8e247500 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:318 [inline]
> ffffffff8e247500 (fs_reclaim){+.+.}-{0:0}, at: prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4727
>
> but task is already holding lock:
> ffff888053415098 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_attr_map_shared+0x92/0xd0 fs/xfs/xfs_inode.c:85
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #1 (&xfs_nondir_ilock_class){++++}-{4:4}:
> lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
> down_write_nested+0x9d/0x200 kernel/locking/rwsem.c:1693
> xfs_reclaim_inode fs/xfs/xfs_icache.c:1045 [inline]
> xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1737 [inline]
> xfs_icwalk_ag+0x12c5/0x1ab0 fs/xfs/xfs_icache.c:1819
> xfs_icwalk fs/xfs/xfs_icache.c:1867 [inline]
> xfs_reclaim_inodes_nr+0x1e3/0x260 fs/xfs/xfs_icache.c:1111
> super_cache_scan+0x41b/0x4b0 fs/super.c:228
> do_shrink_slab+0x6ec/0x1110 mm/shrinker.c:437
> shrink_slab+0xd74/0x10d0 mm/shrinker.c:664
> shrink_one+0x28a/0x7c0 mm/vmscan.c:4939
> shrink_many mm/vmscan.c:5000 [inline]
> lru_gen_shrink_node mm/vmscan.c:5078 [inline]
> shrink_node+0x314e/0x3760 mm/vmscan.c:6060
> kswapd_shrink_node mm/vmscan.c:6911 [inline]
> balance_pgdat mm/vmscan.c:7094 [inline]
> kswapd+0x147c/0x2830 mm/vmscan.c:7359
> kthread+0x70e/0x8a0 kernel/kthread.c:464
> ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>
> -> #0 (fs_reclaim){+.+.}-{0:0}:
> check_prev_add kernel/locking/lockdep.c:3168 [inline]
> check_prevs_add kernel/locking/lockdep.c:3287 [inline]
> validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911
> __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240
> lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
> __fs_reclaim_acquire mm/page_alloc.c:4045 [inline]
> fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4059
> might_alloc include/linux/sched/mm.h:318 [inline]
> prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4727
> __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:4948
> alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
> alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline]
> alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2510
> get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5018
> __kasan_populate_vmalloc mm/kasan/shadow.c:362 [inline]
> kasan_populate_vmalloc+0x33/0x1a0 mm/kasan/shadow.c:417
No deadlock report could be triggered without kasan enabled.
> alloc_vmap_area+0xd51/0x1490 mm/vmalloc.c:2084
> __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3179
> __vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3845
> __vmalloc_node_noprof mm/vmalloc.c:3948 [inline]
> __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3962
> xfs_buf_alloc_backing_mem fs/xfs/xfs_buf.c:239 [inline]
> xfs_buf_alloc+0xed3/0x1d40 fs/xfs/xfs_buf.c:312
> xfs_buf_find_insert+0xab/0x1470 fs/xfs/xfs_buf.c:505
> xfs_buf_get_map+0x1264/0x1860 fs/xfs/xfs_buf.c:609
> xfs_buf_read_map+0x82/0xa50 fs/xfs/xfs_buf.c:702
> xfs_buf_read fs/xfs/xfs_buf.h:260 [inline]
> xfs_attr_rmtval_get+0x5c0/0xb80 fs/xfs/libxfs/xfs_attr_remote.c:434
> xfs_attr_node_get+0x150/0x4f0 fs/xfs/libxfs/xfs_attr.c:1532
> xfs_attr_get_ilocked+0x330/0x410 fs/xfs/libxfs/xfs_attr.c:248
> xfs_attr_get+0x492/0x5e0 fs/xfs/libxfs/xfs_attr.c:289
> xfs_xattr_get+0x125/0x1c0 fs/xfs/xfs_xattr.c:150
> vfs_getxattr_alloc+0x52c/0x580 fs/xattr.c:404
> ima_read_xattr+0x38/0x60 security/integrity/ima/ima_appraise.c:230
> process_measurement+0xfd7/0x1a40 security/integrity/ima/ima_main.c:366
> ima_file_check+0xd7/0x120 security/integrity/ima/ima_main.c:613
> security_file_post_open+0xbb/0x290 security/security.c:3130
> do_open fs/namei.c:3898 [inline]
> path_openat+0x2f26/0x3830 fs/namei.c:4055
> do_filp_open+0x1fa/0x410 fs/namei.c:4082
> do_sys_openat2+0x121/0x1c0 fs/open.c:1437
> do_sys_open fs/open.c:1452 [inline]
> __do_sys_openat fs/open.c:1468 [inline]
> __se_sys_openat fs/open.c:1463 [inline]
> __x64_sys_openat+0x138/0x170 fs/open.c:1463
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> other info that might help us debug this:
>
> Possible unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> rlock(&xfs_nondir_ilock_class);
> lock(fs_reclaim);
> lock(&xfs_nondir_ilock_class);
> lock(fs_reclaim);
>
> *** DEADLOCK ***
>
> 2 locks held by syz.0.0/5339:
> #0: ffff888042ae35b8 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: process_measurement+0x74b/0x1a40 security/integrity/ima/ima_main.c:279
> #1: ffff888053415098 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_ilock_attr_map_shared+0x92/0xd0 fs/xfs/xfs_inode.c:85
>
> stack backtrace:
> CPU: 0 UID: 0 PID: 5339 Comm: syz.0.0 Not tainted 6.16.0-rc5-syzkaller-00038-g733923397fd9 #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> Call Trace:
> <TASK>
> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
> print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046
> check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178
> check_prev_add kernel/locking/lockdep.c:3168 [inline]
> check_prevs_add kernel/locking/lockdep.c:3287 [inline]
> validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911
> __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240
> lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
> __fs_reclaim_acquire mm/page_alloc.c:4045 [inline]
> fs_reclaim_acquire+0x72/0x100 mm/page_alloc.c:4059
> might_alloc include/linux/sched/mm.h:318 [inline]
> prepare_alloc_pages+0x153/0x610 mm/page_alloc.c:4727
> __alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:4948
> alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
> alloc_frozen_pages_noprof mm/mempolicy.c:2490 [inline]
> alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2510
> get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5018
> __kasan_populate_vmalloc mm/kasan/shadow.c:362 [inline]
> kasan_populate_vmalloc+0x33/0x1a0 mm/kasan/shadow.c:417
> alloc_vmap_area+0xd51/0x1490 mm/vmalloc.c:2084
> __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3179
> __vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3845
> __vmalloc_node_noprof mm/vmalloc.c:3948 [inline]
> __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3962
> xfs_buf_alloc_backing_mem fs/xfs/xfs_buf.c:239 [inline]
> xfs_buf_alloc+0xed3/0x1d40 fs/xfs/xfs_buf.c:312
> xfs_buf_find_insert+0xab/0x1470 fs/xfs/xfs_buf.c:505
> xfs_buf_get_map+0x1264/0x1860 fs/xfs/xfs_buf.c:609
> xfs_buf_read_map+0x82/0xa50 fs/xfs/xfs_buf.c:702
> xfs_buf_read fs/xfs/xfs_buf.h:260 [inline]
> xfs_attr_rmtval_get+0x5c0/0xb80 fs/xfs/libxfs/xfs_attr_remote.c:434
> xfs_attr_node_get+0x150/0x4f0 fs/xfs/libxfs/xfs_attr.c:1532
> xfs_attr_get_ilocked+0x330/0x410 fs/xfs/libxfs/xfs_attr.c:248
> xfs_attr_get+0x492/0x5e0 fs/xfs/libxfs/xfs_attr.c:289
> xfs_xattr_get+0x125/0x1c0 fs/xfs/xfs_xattr.c:150
> vfs_getxattr_alloc+0x52c/0x580 fs/xattr.c:404
> ima_read_xattr+0x38/0x60 security/integrity/ima/ima_appraise.c:230
> process_measurement+0xfd7/0x1a40 security/integrity/ima/ima_main.c:366
> ima_file_check+0xd7/0x120 security/integrity/ima/ima_main.c:613
> security_file_post_open+0xbb/0x290 security/security.c:3130
> do_open fs/namei.c:3898 [inline]
> path_openat+0x2f26/0x3830 fs/namei.c:4055
> do_filp_open+0x1fa/0x410 fs/namei.c:4082
> do_sys_openat2+0x121/0x1c0 fs/open.c:1437
> do_sys_open fs/open.c:1452 [inline]
> __do_sys_openat fs/open.c:1468 [inline]
> __se_sys_openat fs/open.c:1463 [inline]
> __x64_sys_openat+0x138/0x170 fs/open.c:1463
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fe72bf8e929
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007fe72ce24038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
> RAX: ffffffffffffffda RBX: 00007fe72c1b6080 RCX: 00007fe72bf8e929
> RDX: 0000000000000042 RSI: 0000200000000000 RDI: ffffffffffffff9c
> RBP: 00007fe72c010b39 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 0000000000000001 R14: 00007fe72c1b6080 R15: 00007ffd78e8cfc8
> </TASK>
>
>
> ---
> 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.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
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