syzbot

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BUG: KASAN: wild-memory-access in atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline]
BUG: KASAN: wild-memory-access in __lock_acquire+0x2a1/0x4ec0 kernel/locking/lockdep.c:3303
Write of size 4 at addr 1ffff10022271100 by task kworker/u4:6/13730

CPU: 1 PID: 13730 Comm: kworker/u4:6 Not tainted 4.19.0-rc5+ #30
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
ebt_limit: overflow, try lower: 0/0
Workqueue: events_unbound call_usermodehelper_exec_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
 kasan_report_error mm/kasan/report.c:352 [inline]
 kasan_report.cold.9+0x6d/0x309 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
 atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline]
 __lock_acquire+0x2a1/0x4ec0 kernel/locking/lockdep.c:3303
 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x61/0x80 kernel/locking/spinlock.c:160
 spin_lock_irq include/linux/spinlock.h:354 [inline]
 kernel_sigaction+0xa9/0x270 kernel/signal.c:3396
 call_usermodehelper_exec_sync kernel/umh.c:129 [inline]
 call_usermodehelper_exec_work+0xb5/0x2f0 kernel/umh.c:182
 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 13730 Comm: kworker/u4:6 Tainted: G    B             4.19.0-rc5+ #30
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound call_usermodehelper_exec_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c4/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 kasan_end_report+0x47/0x4f mm/kasan/report.c:180
 kasan_report_error mm/kasan/report.c:359 [inline]
 kasan_report.cold.9+0x76/0x309 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
 atomic_inc include/asm-generic/atomic-instrumented.h:109 [inline]
 __lock_acquire+0x2a1/0x4ec0 kernel/locking/lockdep.c:3303
 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x61/0x80 kernel/locking/spinlock.c:160
 spin_lock_irq include/linux/spinlock.h:354 [inline]
 kernel_sigaction+0xa9/0x270 kernel/signal.c:3396
 call_usermodehelper_exec_sync kernel/umh.c:129 [inline]
 call_usermodehelper_exec_work+0xb5/0x2f0 kernel/umh.c:182
 process_one_work+0xc90/0x1b90 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Kernel Offset: disabled
Rebooting in 86400 seconds..