linux-kernel - Re: [syzbot] [arm?] WARNING in delayed_work_timer

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Message-ID: <675c28e0.050a0220.17d782.000d.GAE@google.com>
Date: Fri, 13 Dec 2024 04:30:24 -0800
From: syzbot <syzbot+e13e654d315d4da1277c@...kaller.appspotmail.com>
To: catalin.marinas@....com, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	will@...nel.org
Subject: Re: [syzbot] [arm?] WARNING in delayed_work_timer_fn

syzbot has found a reproducer for the following issue on:

HEAD commit:    2e7aff49b5da Merge branches 'for-next/core' and 'for-next/..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=11ed5be8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=696fb014d05da3a3
dashboard link: https://syzkaller.appspot.com/bug?extid=e13e654d315d4da1277c
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10192d44580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ef408f67fde3/disk-2e7aff49.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/414ac17a20dc/vmlinux-2e7aff49.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a93415d2a7e7/Image-2e7aff49.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e13e654d315d4da1277c@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 6023 at kernel/workqueue.c:2257 current_wq_worker kernel/workqueue_internal.h:69 [inline]
WARNING: CPU: 1 PID: 6023 at kernel/workqueue.c:2257 is_chained_work kernel/workqueue.c:2199 [inline]
WARNING: CPU: 1 PID: 6023 at kernel/workqueue.c:2257 __queue_work+0xe50/0x1308 kernel/workqueue.c:2256
Modules linked in:
CPU: 1 UID: 0 PID: 6023 Comm: klogd Not tainted 6.13.0-rc2-syzkaller-g2e7aff49b5da #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 404000c5 (nZcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __queue_work+0xe50/0x1308 kernel/workqueue_internal.h:69
lr : current_wq_worker kernel/workqueue_internal.h:69 [inline]
lr : is_chained_work kernel/workqueue.c:2199 [inline]
lr : __queue_work+0xe50/0x1308 kernel/workqueue.c:2256
sp : ffff800080017b40
x29: ffff800080017b90 x28: dfff800000000000 x27: ffff700010002f88
x26: dfff800000000000 x25: ffff0000d1c63800 x24: 0000000000000008
x23: 1fffe0001b14d791 x22: ffff0000d1c639c0 x21: 0000000000000100
x20: ffff0000d8a6bc80 x19: ffff0000da2f0930 x18: 1fffe000366c5e7e
x17: ffff800123d64000 x16: ffff80008326d65c x15: 0000000000000002
x14: 1ffff00011f300ca x13: dfff800000000000 x12: 00000000b1aebe1c
x11: 00000000beaa9035 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000d8a6bc80 x7 : ffff8000805819c0 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff80008df6a320
x2 : ffff0000da2f0930 x1 : 0000000000000100 x0 : 0000000000000000
Call trace:
 current_wq_worker kernel/workqueue_internal.h:69 [inline] (P)
 is_chained_work kernel/workqueue.c:2199 [inline] (P)
 __queue_work+0xe50/0x1308 kernel/workqueue.c:2256 (P)
 current_wq_worker kernel/workqueue_internal.h:69 [inline] (L)
 is_chained_work kernel/workqueue.c:2199 [inline] (L)
 __queue_work+0xe50/0x1308 kernel/workqueue.c:2256 (L)
 delayed_work_timer_fn+0x74/0x90 kernel/workqueue.c:2485
 call_timer_fn+0x1b4/0x8b8 kernel/time/timer.c:1793
 expire_timers kernel/time/timer.c:1839 [inline]
 __run_timers kernel/time/timer.c:2418 [inline]
 __run_timer_base+0x59c/0x7b4 kernel/time/timer.c:2430
 run_timer_base kernel/time/timer.c:2439 [inline]
 run_timer_softirq+0xcc/0x194 kernel/time/timer.c:2449
 handle_softirqs+0x320/0xd34 kernel/softirq.c:554
 __do_softirq+0x14/0x20 kernel/softirq.c:588
 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81
 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891
 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86
 invoke_softirq kernel/softirq.c:435 [inline]
 __irq_exit_rcu+0x1d8/0x544 kernel/softirq.c:655
 irq_exit_rcu+0x14/0x84 kernel/softirq.c:671
 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline]
 el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580
 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P)
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P)
 raw_spin_rq_unlock_irq kernel/sched/sched.h:1526 [inline] (P)
 finish_lock_switch+0xc0/0x1e4 kernel/sched/core.c:5123 (P)
 raw_spin_rq_unlock_irq kernel/sched/sched.h:1526 [inline] (L)
 finish_lock_switch+0xbc/0x1e4 kernel/sched/core.c:5123 (L)
 finish_task_switch+0x120/0x608 kernel/sched/core.c:5241
 context_switch kernel/sched/core.c:5372 [inline]
 __schedule+0x1748/0x27f0 kernel/sched/core.c:6756
 preempt_schedule_irq+0x80/0x188 kernel/sched/core.c:7078
 arm64_preempt_schedule_irq arch/arm64/kernel/entry-common.c:301 [inline]
 __el1_irq arch/arm64/kernel/entry-common.c:563 [inline]
 el1_interrupt+0x4c/0x68 arch/arm64/kernel/entry-common.c:575
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580
 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596
 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P)
 arch_local_irq_enable arch/arm64/include/asm/irqflags.h:48 [inline] (P)
 do_notify_resume+0x5c/0x1f4 arch/arm64/kernel/entry-common.c:133 (P)
 do_notify_resume+0x58/0x1f4 arch/arm64/kernel/entry-common.c:133 (L)
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_interrupt+0xc8/0x248 arch/arm64/kernel/entry-common.c:832
 __el0_irq_handler_common+0x18/0x24 arch/arm64/kernel/entry-common.c:837
 el0t_64_irq_handler+0x10/0x1c arch/arm64/kernel/entry-common.c:842
 el0t_64_irq+0x198/0x19c arch/arm64/kernel/entry.S:601
irq event stamp: 35689
hardirqs last  enabled at (35688): [<ffff80008b687f2c>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline]
hardirqs last  enabled at (35688): [<ffff80008b687f2c>] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:95
hardirqs last disabled at (35689): [<ffff80008b6a9b44>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
hardirqs last disabled at (35689): [<ffff80008b6a9b44>] _raw_spin_lock_irq+0x28/0x70 kernel/locking/spinlock.c:170
softirqs last  enabled at (34558): [<ffff800080129934>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (35685): [<ffff800080020db4>] __do_softirq+0x14/0x20 kernel/softirq.c:588
---[ end trace 0000000000000000 ]---


---
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#syz test: git://repo/address.git branch-or-commit-hash
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