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Message-ID: <CACT4Y+Zv4F1u3XsCH7Hp1Pc+9XCN6WZDDLObrWHiSwduH80uwQ@mail.gmail.com>
Date: Wed, 25 Apr 2018 09:27:42 +0200
From: Dmitry Vyukov <dvyukov@...gle.com>
To: syzbot <syzbot+4529a1346c0a67500ab9@...kaller.appspotmail.com>
Cc: Alexey Dobriyan <adobriyan@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Gargi Sharma <gs051095@...il.com>,
Laura Abbott <lauraa@...eaurora.org>,
LKML <linux-kernel@...r.kernel.org>, linux@...inikbrodowski.net,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
Thomas Gleixner <tglx@...utronix.de>, thomas.lendacky@....com
Subject: Re: WARNING: kernel stack regs has bad value
On Wed, Apr 25, 2018 at 5:50 AM, syzbot
<syzbot+4529a1346c0a67500ab9@...kaller.appspotmail.com> wrote:
> Hello,
>
> syzbot hit the following crash on upstream commit
> 24cac7009cb1b211f1c793ecb6a462c03dc35818 (Tue Apr 24 21:16:40 2018 +0000)
> Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
> syzbot dashboard link:
> https://syzkaller.appspot.com/bug?extid=4529a1346c0a67500ab9
>
> So far this crash happened 2 times on upstream.
> C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5707297623900160
> syzkaller reproducer:
> https://syzkaller.appspot.com/x/repro.syz?id=4674478248296448
> Raw console output:
> https://syzkaller.appspot.com/x/log.txt?id=5189967202484224
> Kernel config:
> https://syzkaller.appspot.com/x/.config?id=7043958930931867332
> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+4529a1346c0a67500ab9@...kaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for
> details.
> If you forward the report, please keep this part and the footer.
This is the same as:
#syz dup: WARNING: kernel stack regs at (ptrval) in syzkaller has bad
'bp' value (ptrval)
https://groups.google.com/forum/#!msg/syzkaller-bugs/03r-GmCNiYw/xvl34jYDAwAJ
> (ptrval): 0000000000440d69 (0x440d69)
> (ptrval): 0000000000000033 (0x33)
> (ptrval): 0000000000000246 (0x246)
> (ptrval): 00007ffca6a2bae8 (0x7ffca6a2bae8)
> (ptrval): 000000000000002b (0x2b)
> WARNING: kernel stack regs at (ptrval) in syz-executor366:4507 has
> bad 'bp' value (ptrval)
>
> ================================
> WARNING: inconsistent lock state
> 4.17.0-rc2+ #15 Not tainted
> --------------------------------
> inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
> sshd/4505 [HC1[1]:SC0[0]:HE0:SE1] takes:
> (ptrval) (fs_reclaim){?.+.}, at: fs_reclaim_acquire.part.82+0x0/0x30
> mm/page_alloc.c:463
> {HARDIRQ-ON-W} state was registered at:
> lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
> fs_reclaim_acquire.part.82+0x24/0x30 mm/page_alloc.c:3739
> fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3740
> slab_pre_alloc_hook mm/slab.h:418 [inline]
> slab_alloc_node mm/slab.c:3299 [inline]
> kmem_cache_alloc_node_trace+0x39/0x770 mm/slab.c:3661
> kmalloc_node include/linux/slab.h:550 [inline]
> kzalloc_node include/linux/slab.h:712 [inline]
> alloc_worker+0xbd/0x2e0 kernel/workqueue.c:1704
> init_rescuer.part.25+0x1f/0x190 kernel/workqueue.c:4000
> init_rescuer kernel/workqueue.c:3997 [inline]
> workqueue_init+0x51f/0x7d0 kernel/workqueue.c:5732
> kernel_init_freeable+0x2ad/0x58e init/main.c:1115
> kernel_init+0x11/0x1b3 init/main.c:1053
> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
> irq event stamp: 688138
> hardirqs last enabled at (688137): [<ffffffff816878c5>]
> seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline]
> hardirqs last enabled at (688137): [<ffffffff816878c5>] read_seqcount_begin
> include/linux/seqlock.h:164 [inline]
> hardirqs last enabled at (688137): [<ffffffff816878c5>]
> ktime_get_ts64+0x405/0x510 kernel/time/timekeeping.c:850
> hardirqs last disabled at (688138): [<ffffffff87800905>]
> interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625
> softirqs last enabled at (688130): [<ffffffff85d601e2>] spin_unlock_bh
> include/linux/spinlock.h:355 [inline]
> softirqs last enabled at (688130): [<ffffffff85d601e2>]
> release_sock+0x1e2/0x2b0 net/core/sock.c:2861
> softirqs last disabled at (688128): [<ffffffff85d60074>] spin_lock_bh
> include/linux/spinlock.h:315 [inline]
> softirqs last disabled at (688128): [<ffffffff85d60074>]
> release_sock+0x74/0x2b0 net/core/sock.c:2848
>
> other info that might help us debug this:
> Possible unsafe locking scenario:
>
> CPU0
> ----
> lock(fs_reclaim);
> <Interrupt>
> lock(fs_reclaim);
>
> *** DEADLOCK ***
>
> no locks held by sshd/4505.
>
> stack backtrace:
> CPU: 0 PID: 4505 Comm: sshd Not tainted 4.17.0-rc2+ #15
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x1b9/0x294 lib/dump_stack.c:113
> print_usage_bug.cold.59+0x320/0x41a kernel/locking/lockdep.c:2542
> valid_state kernel/locking/lockdep.c:2555 [inline]
> mark_lock_irq kernel/locking/lockdep.c:2749 [inline]
> mark_lock+0x1034/0x19e0 kernel/locking/lockdep.c:3147
> mark_irqflags kernel/locking/lockdep.c:3022 [inline]
> __lock_acquire+0x1595/0x5140 kernel/locking/lockdep.c:3388
> lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920
> fs_reclaim_acquire.part.82+0x24/0x30 mm/page_alloc.c:3739
> fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3740
> slab_pre_alloc_hook mm/slab.h:418 [inline]
> slab_alloc mm/slab.c:3378 [inline]
> __do_kmalloc mm/slab.c:3716 [inline]
> __kmalloc+0x45/0x760 mm/slab.c:3727
> kmalloc_array include/linux/slab.h:631 [inline]
> kcalloc include/linux/slab.h:642 [inline]
> numa_crng_init drivers/char/random.c:798 [inline]
> crng_reseed+0x427/0x920 drivers/char/random.c:923
> credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708
> add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254
> handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191
> handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206
> handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791
> generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
> handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77
> do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
> common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
> </IRQ>
> RIP: 0010:__sanitizer_cov_trace_const_cmp8+0xf/0x20 kernel/kcov.c:194
> RSP: 0018:ffff8801cf7f7a30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd5
> RAX: dffffc0000000000 RBX: 00007ffffffff000 RCX: ffffffff81bdcde5
> RDX: 00007ffffffff000 RSI: ffffffffffffffff RDI: 0000000000000007
> RBP: ffff8801cf7f7a30 R08: ffff8801b3c78600 R09: ffffed003b5c46c2
> R10: 0000000000000003 R11: 0000000000000000 R12: ffffffff87f9ef20
> R13: 000000000000000a R14: ffff8801cf7f7ba8 R15: 000055f253dfead0
> __might_fault+0x55/0x1e0 mm/memory.c:4548
> _copy_from_user+0x30/0x150 lib/usercopy.c:10
> copy_from_user include/linux/uaccess.h:147 [inline]
> get_fd_set fs/select.c:367 [inline]
> core_sys_select+0x3e2/0xb60 fs/select.c:647
> kern_select+0x1b7/0x250 fs/select.c:696
> __do_sys_select fs/select.c:705 [inline]
> __se_sys_select fs/select.c:702 [inline]
> __x64_sys_select+0xbe/0x150 fs/select.c:702
> do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x7f7337a51dd3
> RSP: 002b:00007fffa0a9c698 EFLAGS: 00000246 ORIG_RAX: 0000000000000017
> RAX: ffffffffffffffda RBX: 00007fffa0a9c720 RCX: 00007f7337a51dd3
> RDX: 000055f253dfeab0 RSI: 000055f253dfead0 RDI: 000000000000000c
> RBP: 000055f2539298dc R08: 00007fffa0a9c6c0 R09: 0101010101010101
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa0a9c728
> R13: 0000000000000000 R14: 00007fffa0a9c718 R15: 00007fffa0a9c71c
> BUG: sleeping function called from invalid context at mm/slab.h:421
> in_atomic(): 1, irqs_disabled(): 1, pid: 4505, name: sshd
> INFO: lockdep is turned off.
> irq event stamp: 688138
> hardirqs last enabled at (688137): [<ffffffff816878c5>]
> seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline]
> hardirqs last enabled at (688137): [<ffffffff816878c5>] read_seqcount_begin
> include/linux/seqlock.h:164 [inline]
> hardirqs last enabled at (688137): [<ffffffff816878c5>]
> ktime_get_ts64+0x405/0x510 kernel/time/timekeeping.c:850
> hardirqs last disabled at (688138): [<ffffffff87800905>]
> interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625
> softirqs last enabled at (688130): [<ffffffff85d601e2>] spin_unlock_bh
> include/linux/spinlock.h:355 [inline]
> softirqs last enabled at (688130): [<ffffffff85d601e2>]
> release_sock+0x1e2/0x2b0 net/core/sock.c:2861
> softirqs last disabled at (688128): [<ffffffff85d60074>] spin_lock_bh
> include/linux/spinlock.h:315 [inline]
> softirqs last disabled at (688128): [<ffffffff85d60074>]
> release_sock+0x74/0x2b0 net/core/sock.c:2848
> CPU: 0 PID: 4505 Comm: sshd Not tainted 4.17.0-rc2+ #15
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x1b9/0x294 lib/dump_stack.c:113
> ___might_sleep.cold.87+0x11f/0x13a kernel/sched/core.c:6188
> __might_sleep+0x95/0x190 kernel/sched/core.c:6141
> slab_pre_alloc_hook mm/slab.h:421 [inline]
> slab_alloc mm/slab.c:3378 [inline]
> __do_kmalloc mm/slab.c:3716 [inline]
> __kmalloc+0x2b9/0x760 mm/slab.c:3727
> kmalloc_array include/linux/slab.h:631 [inline]
> kcalloc include/linux/slab.h:642 [inline]
> numa_crng_init drivers/char/random.c:798 [inline]
> crng_reseed+0x427/0x920 drivers/char/random.c:923
> credit_entropy_bits+0x98d/0xa30 drivers/char/random.c:708
> add_interrupt_randomness+0x494/0x860 drivers/char/random.c:1254
> handle_irq_event_percpu+0xf9/0x1c0 kernel/irq/handle.c:191
> handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206
> handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791
> generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
> handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77
> do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245
> common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642
> </IRQ>
> RIP: 0010:__sanitizer_cov_trace_const_cmp8+0xf/0x20 kernel/kcov.c:194
> RSP: 0018:ffff8801cf7f7a30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffffd5
> RAX: dffffc0000000000 RBX: 00007ffffffff000 RCX: ffffffff81bdcde5
> RDX: 00007ffffffff000 RSI: ffffffffffffffff RDI: 0000000000000007
> RBP: ffff8801cf7f7a30 R08: ffff8801b3c78600 R09: ffffed003b5c46c2
> R10: 0000000000000003 R11: 0000000000000000 R12: ffffffff87f9ef20
> R13: 000000000000000a R14: ffff8801cf7f7ba8 R15: 000055f253dfead0
> __might_fault+0x55/0x1e0 mm/memory.c:4548
> _copy_from_user+0x30/0x150 lib/usercopy.c:10
> copy_from_user include/linux/uaccess.h:147 [inline]
> get_fd_set fs/select.c:367 [inline]
> core_sys_select+0x3e2/0xb60 fs/select.c:647
> kern_select+0x1b7/0x250 fs/select.c:696
> __do_sys_select fs/select.c:705 [inline]
> __se_sys_select fs/select.c:702 [inline]
> __x64_sys_select+0xbe/0x150 fs/select.c:702
> do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x7f7337a51dd3
> RSP: 002b:00007fffa0a9c698 EFLAGS: 00000246 ORIG_RAX: 0000000000000017
> RAX: ffffffffffffffda RBX: 00007fffa0a9c720 RCX: 00007f7337a51dd3
> RDX: 000055f253dfeab0 RSI: 000055f253dfead0 RDI: 000000000000000c
> RBP: 000055f2539298dc R08: 00007fffa0a9c6c0 R09: 0101010101010101
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa0a9c728
> R13: 0000000000000000 R14: 00007fffa0a9c718 R15: 00007fffa0a9c71c
> random: crng init done
>
>
> ---
> This bug is generated by a dumb bot. It may contain errors.
> See https://goo.gl/tpsmEJ for details.
> Direct all questions to syzkaller@...glegroups.com.
>
> syzbot will keep track of this bug report.
> If you forgot to add the Reported-by tag, once the fix for this bug is
> merged
> into any tree, please reply to this email with:
> #syz fix: exact-commit-title
> If you want to test a patch for this bug, please reply with:
> #syz test: git://repo/address.git branch
> and provide the patch inline or as an attachment.
> To mark this as a duplicate of another syzbot report, please reply with:
> #syz dup: exact-subject-of-another-report
> If it's a one-off invalid bug report, please reply with:
> #syz invalid
> Note: if the crash happens again, it will cause creation of a new bug
> report.
> Note: all commands must start from beginning of the line in the email body.
>
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