rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=dfd/1/0x4000000000000000 softirq=19245/19245 fqs=0 
	(detected by 0, t=10502 jiffies, g=26473, q=192)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3559 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__kasan_check_read+0x6/0x10 mm/kasan/shadow.c:31
Code: 41 5f 5d c3 48 c7 c7 0b 71 b8 8b eb 0a 48 c7 c7 31 a1 a2 8b 48 89 de e8 c8 38 db 07 31 ed eb d7 00 00 cc cc 89 f6 48 8b 0c 24 <31> d2 e9 43 ef ff ff 0f 1f 00 89 f6 48 8b 0c 24 ba 01 00 00 00 e9
RSP: 0018:ffffc90000dd0898 EFLAGS: 00000002
RAX: 0000000000000008 RBX: ffff88807d6b3b80 RCX: ffffffff815cb124
RDX: 0000000000000008 RSI: 0000000000000008 RDI: ffffffff8ffaa0c8
RBP: 0000000000000008 R08: dffffc0000000000 R09: fffffbfff1ff541a
R10: fffffbfff1ff541a R11: 1ffffffff1ff5419 R12: 0000000000000100
R13: dffffc0000000000 R14: ffff88807d6b4698 R15: 0000000000000060
FS:  00007f1171c45880(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c7ebf0f18 CR3: 000000007c48b000 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]
 hlock_class kernel/locking/lockdep.c:197 [inline]
 mark_lock+0x94/0x320 kernel/locking/lockdep.c:4569
 mark_usage kernel/locking/lockdep.c:4512 [inline]
 __lock_acquire+0xd5a/0x7c60 kernel/locking/lockdep.c:4966
 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x9f/0xe0 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x5ff/0xc40 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:tomoyo_check_acl+0x186/0x3f0 security/tomoyo/domain.c:175
Code: 84 c0 0f 85 04 01 00 00 49 8b 36 48 8b 3c 24 e8 40 c5 ff ff 84 c0 0f 85 2f 02 00 00 e8 b3 53 dc fd eb 0c e8 ac 53 dc fd eb 05 <e8> a5 53 dc fd 48 89 e8 48 c1 e8 03 0f b6 04 18 84 c0 75 45 48 8d
RSP: 0018:ffffc90002297a30 EFLAGS: 00000246
RAX: 1ffff92000452f00 RBX: dffffc0000000000 RCX: ffff88807d6b3b80
RDX: 0000000000000000 RSI: 00000000604c0f63 RDI: 00000000a87bdf59
RBP: ffff88807d515980 R08: ffff88807d6b3b80 R09: 0000000000000003
R10: 0000000000000009 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88802a675310 R14: 0000000000000000 R15: 0000000000000000
 tomoyo_path_permission+0x1b4/0x380 security/tomoyo/file.c:586
 tomoyo_path_perm+0x3d9/0x510 security/tomoyo/file.c:838
 security_inode_getattr+0xcf/0x120 security/security.c:1348
 vfs_getattr+0x26/0x3a0 fs/stat.c:157
 vfs_fstat fs/stat.c:182 [inline]
 __do_sys_newfstat fs/stat.c:421 [inline]
 __se_sys_newfstat fs/stat.c:418 [inline]
 __x64_sys_newfstat+0x104/0x1d0 fs/stat.c:418
 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: 0033:0x7f1171d9dad7
Code: 73 01 c3 48 8b 0d 21 f3 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffffc1cc7d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000005
RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00007f1171d9dad7
RDX: 0000000000090800 RSI: 00007ffffc1cc7e0 RDI: 000000000000000f
RBP: 00007ffffc1cc7e0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000202 R12: 0000560c7ebee7b0
R13: 00000000000000fd R14: 0000560c4732ebe0 R15: 00007ffffc1ccb90
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g26473 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=9065
rcu: rcu_preempt kthread starved for 10502 jiffies! g26473 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:27200 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11bb/0x4390 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x15c/0x280 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x29e/0x11b0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x98/0x350 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: 3559 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__lock_acquire+0x104e/0x7c60 kernel/locking/lockdep.c:-1
Code: f1 31 cb 41 01 d6 29 da 41 89 dc 41 c1 c4 04 41 31 d4 48 c7 c0 48 69 69 8d 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85 8c 5a 00 00 <41> 01 de 83 3d d0 59 0d 0c 00 4c 8b 7c 24 18 0f 85 f9 02 00 00 48
RSP: 0018:ffffc90000dd08c0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 000000004e5a6d80 RCX: 00000000fafa4590
RDX: 00000000ae0af538 RSI: 000000000003956b RDI: ffffffff8ffaa288
RBP: ffffc90000dd0b10 R08: dffffc0000000000 R09: fffffbfff1ff5452
R10: fffffbfff1ff5452 R11: 1ffffffff1ff5451 R12: 000000004bac2d3c
R13: ffff88807d6b3b80 R14: 000000000167794c R15: 0000000000000e6c
FS:  00007f1171c45880(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560c7ebf0f18 CR3: 000000007c48b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x197/0x3f0 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+0x47/0x940 net/sched/sch_taprio.c:716
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x53d/0xc40 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:tomoyo_check_acl+0x186/0x3f0 security/tomoyo/domain.c:175
Code: 84 c0 0f 85 04 01 00 00 49 8b 36 48 8b 3c 24 e8 40 c5 ff ff 84 c0 0f 85 2f 02 00 00 e8 b3 53 dc fd eb 0c e8 ac 53 dc fd eb 05 <e8> a5 53 dc fd 48 89 e8 48 c1 e8 03 0f b6 04 18 84 c0 75 45 48 8d
RSP: 0018:ffffc90002297a30 EFLAGS: 00000246
RAX: 1ffff92000452f00 RBX: dffffc0000000000 RCX: ffff88807d6b3b80
RDX: 0000000000000000 RSI: 00000000604c0f63 RDI: 00000000a87bdf59
RBP: ffff88807d515980 R08: ffff88807d6b3b80 R09: 0000000000000003
R10: 0000000000000009 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88802a675310 R14: 0000000000000000 R15: 0000000000000000
 tomoyo_path_permission+0x1b4/0x380 security/tomoyo/file.c:586
 tomoyo_path_perm+0x3d9/0x510 security/tomoyo/file.c:838
 security_inode_getattr+0xcf/0x120 security/security.c:1348
 vfs_getattr+0x26/0x3a0 fs/stat.c:157
 vfs_fstat fs/stat.c:182 [inline]
 __do_sys_newfstat fs/stat.c:421 [inline]
 __se_sys_newfstat fs/stat.c:418 [inline]
 __x64_sys_newfstat+0x104/0x1d0 fs/stat.c:418
 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: 0033:0x7f1171d9dad7
Code: 73 01 c3 48 8b 0d 21 f3 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffffc1cc7d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000005
RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00007f1171d9dad7
RDX: 0000000000090800 RSI: 00007ffffc1cc7e0 RDI: 000000000000000f
RBP: 00007ffffc1cc7e0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000202 R12: 0000560c7ebee7b0
R13: 00000000000000fd R14: 0000560c4732ebe0 R15: 00007ffffc1ccb90
 </TASK>