rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=a97/1/0x4000000000000000 softirq=18221/18221 fqs=0 
	(detected by 0, t=10505 jiffies, g=25737, q=632)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3561 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_region_inline mm/kasan/generic.c:169 [inline]
RIP: 0010:kasan_check_range+0xe/0x290 mm/kasan/generic.c:189
Code: 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 00 00 cc cc 00 00 cc cc 00 00 cc cc b0 01 48 85 f6 0f 84 ac 01 00 00 55 41 57 <41> 56 41 54 53 49 89 f8 49 01 f0 0f 82 0e 02 00 00 49 89 f8 49 c1
RSP: 0018:ffffc90000dd0b68 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff815d25d6
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d8a06e8
RBP: ffffc90000dd0c88 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1b140de R12: ffff888027280300
R13: 1ffff920001ba17c R14: 0000000000000001 R15: dffffc0000000000
FS:  00007fde6a166880(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005573a19fc950 CR3: 000000007cf69000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 cpumask_test_cpu include/linux/cpumask.h:344 [inline]
 cpu_online include/linux/cpumask.h:895 [inline]
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0xb6/0x400 kernel/locking/lockdep.c:5594
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:364 [inline]
 advance_sched+0x49/0x920 net/sched/sch_taprio.c:695
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4f2/0xb70 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:arch_atomic64_try_cmpxchg arch/x86/include/asm/atomic64_64.h:190 [inline]
RIP: 0010:arch_atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-long.h:443 [inline]
RIP: 0010:atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1669 [inline]
RIP: 0010:rwsem_write_trylock+0xa6/0x1c0 kernel/locking/rwsem.c:262
Code: ff 48 89 df be 08 00 00 00 e8 26 cb 61 00 4c 89 f7 be 08 00 00 00 e8 19 cb 61 00 48 8b 44 24 20 b9 01 00 00 00 f0 48 0f b1 0b <41> 0f 94 c6 0f 85 c8 00 00 00 48 c7 c0 84 3a 8a 8d 48 c1 e8 03 42
RSP: 0018:ffffc90002207520 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888076755a30 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90002207540
RBP: ffffc900022075c0 R08: ffffc90002207547 R09: 1ffff92000440ea8
R10: dffffc0000000000 R11: fffff52000440ea9 R12: 1ffff92000440ea4
R13: dffffc0000000000 R14: ffffc90002207540 R15: dffffc0000000000
 __down_write_common kernel/locking/rwsem.c:1291 [inline]
 __down_write kernel/locking/rwsem.c:1301 [inline]
 down_write+0x44/0x60 kernel/locking/rwsem.c:1552
 inode_lock include/linux/fs.h:787 [inline]
 process_measurement+0x3af/0x1ba0 security/integrity/ima/ima_main.c:242
 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533
 do_open fs/namei.c:3618 [inline]
 path_openat+0x27a8/0x2fa0 fs/namei.c:3750
 do_filp_open+0x1e2/0x410 fs/namei.c:3777
 do_sys_openat2+0x150/0x4b0 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fde6a254407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffee6fa13f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fde6a166880 RCX: 00007fde6a254407
RDX: 0000000000080000 RSI: 00007ffee6fa1570 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000056404b4bb7f5
R13: 000056404b4bb7f5 R14: 0000000000000001 R15: 00007ffee6fa5bd0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g25737 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=18879
rcu: rcu_preempt kthread starved for 10505 jiffies! g25737 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:27760 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11d0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9b/0x370 kernel/rcu/tree.c:2145
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3561 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3682 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3701 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3756 [inline]
RIP: 0010:__lock_acquire+0x16e7/0x7d10 kernel/locking/lockdep.c:5012
Code: 00 48 8b 7c 24 38 48 8b 74 24 10 48 ba 00 00 00 00 00 fc ff df e9 65 ff ff ff 4c 8d 73 18 4c 89 f0 48 c1 e8 03 42 80 3c 00 00 <74> 12 4c 89 f7 e8 ff 20 61 00 49 b8 00 00 00 00 00 fc ff df 49 8b
RSP: 0018:ffffc90000dd0900 EFLAGS: 00000046
RAX: 1ffffffff2069557 RBX: ffffffff9034aaa0 RCX: ffffffff815d3e00
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff901d8260
RBP: ffffc90000dd0b50 R08: dffffc0000000000 R09: 1ffffffff203b04c
R10: dffffc0000000000 R11: fffffbfff203b04d R12: e90b65d0a83111cf
R13: ffff88807d49d940 R14: ffffffff9034aab8 R15: ffff88807d49e478
FS:  00007fde6a166880(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005573a19fc950 CR3: 000000007cf69000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:364 [inline]
 advance_sched+0x49/0x920 net/sched/sch_taprio.c:695
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4f2/0xb70 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:arch_atomic64_try_cmpxchg arch/x86/include/asm/atomic64_64.h:190 [inline]
RIP: 0010:arch_atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-long.h:443 [inline]
RIP: 0010:atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1669 [inline]
RIP: 0010:rwsem_write_trylock+0xa6/0x1c0 kernel/locking/rwsem.c:262
Code: ff 48 89 df be 08 00 00 00 e8 26 cb 61 00 4c 89 f7 be 08 00 00 00 e8 19 cb 61 00 48 8b 44 24 20 b9 01 00 00 00 f0 48 0f b1 0b <41> 0f 94 c6 0f 85 c8 00 00 00 48 c7 c0 84 3a 8a 8d 48 c1 e8 03 42
RSP: 0018:ffffc90002207520 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888076755a30 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90002207540
RBP: ffffc900022075c0 R08: ffffc90002207547 R09: 1ffff92000440ea8
R10: dffffc0000000000 R11: fffff52000440ea9 R12: 1ffff92000440ea4
R13: dffffc0000000000 R14: ffffc90002207540 R15: dffffc0000000000
 __down_write_common kernel/locking/rwsem.c:1291 [inline]
 __down_write kernel/locking/rwsem.c:1301 [inline]
 down_write+0x44/0x60 kernel/locking/rwsem.c:1552
 inode_lock include/linux/fs.h:787 [inline]
 process_measurement+0x3af/0x1ba0 security/integrity/ima/ima_main.c:242
 ima_file_check+0xc7/0x110 security/integrity/ima/ima_main.c:533
 do_open fs/namei.c:3618 [inline]
 path_openat+0x27a8/0x2fa0 fs/namei.c:3750
 do_filp_open+0x1e2/0x410 fs/namei.c:3777
 do_sys_openat2+0x150/0x4b0 fs/open.c:1255
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fde6a254407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffee6fa13f0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fde6a166880 RCX: 00007fde6a254407
RDX: 0000000000080000 RSI: 00007ffee6fa1570 RDI: ffffffffffffff9c
RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000056404b4bb7f5
R13: 000056404b4bb7f5 R14: 0000000000000001 R15: 00007ffee6fa5bd0
 </TASK>