rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5236/1:b..l
rcu: (detected by 1, t=10504 jiffies, g=18473, q=343 ncpus=2)
task:udevd state:R running task stack:22800 pid:5236 tgid:5236 ppid:1 task_flags:0x400140 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288
irqentry_exit+0x6f/0x90 kernel/entry/common.c:197
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_release+0x2b5/0x3e0 kernel/locking/lockdep.c:5893
Code: 51 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 56 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 cb 68 03 11 <48> 3b 44 24 28 0f 85 8b 00 00 00 48 83 c4 30 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000f2df730 EFLAGS: 00000206
RAX: 643f94fe342fdc00 RBX: 0000000000000202 RCX: 643f94fe342fdc00
RDX: 0000000000000000 RSI: ffffffff8dbaa5db RDI: ffffffff8be34480
RBP: ffff8880717cc6f0 R08: ffff888079db13d3 R09: 1ffff1100f3b627a
R10: dffffc0000000000 R11: ffffed100f3b627b R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e13a160 R15: ffff8880717cbc00
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
__d_lookup+0x6da/0x780 fs/dcache.c:2413
lookup_fast+0x84/0x5b0 fs/namei.c:1766
walk_component fs/namei.c:2125 [inline]
link_path_walk+0x642/0xea0 fs/namei.c:2497
path_openat+0x28c/0x3830 fs/namei.c:4042
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1461
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f791c715c3a
RSP: 002b:00007ffd89babb78 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000561b86dc49f0 RCX: 00007f791c715c3a
RDX: 0000000000090800 RSI: 0000561b86cad410 RDI: 00000000ffffff9c
RBP: 0000561b86cad410 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000206 R12: 0000561b86cbe7b0
R13: 00000000000000ff R14: 0000561b71f18be0 R15: 00007ffd89babe00
rcu: rcu_preempt kthread starved for 10502 jiffies! g18473 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27160 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 7715 Comm: syz.1.430 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline]
RIP: 0010:smp_call_function_single+0x3a9/0x590 kernel/smp.c:687
Code: 33 44 89 f6 83 e6 01 31 ff e8 83 7a 0b 00 41 83 e6 01 75 11 e8 38 76 0b 00 4d 89 fe eb 3f e8 2e 76 0b 00 eb 3c 4d 89 fe f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 11 76 0b 00
RSP: 0018:ffffc900055bfaa0 EFLAGS: 00000246
RAX: ffffffff81b44f8f RBX: ffffc900055bfae8 RCX: 0000000000080000
RDX: ffffc90005103000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900055bfb90 R08: ffffffff8fa3b537 R09: 1ffffffff1f476a6
R10: dffffc0000000000 R11: ffffffff81706100 R12: 1ffff92000ab7f5d
R13: dffffc0000000000 R14: 1ffff92000ab7f58 R15: 1ffff92000ab7f58
FS: 00007fda2b9ab6c0(0000) GS:ffff888125d11000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3b1c57 CR3: 000000007695a000 CR4: 00000000003526f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
cpu_function_call kernel/events/core.c:154 [inline]
perf_install_in_context+0x519/0x8f0 kernel/events/core.c:3065
__do_sys_perf_event_open kernel/events/core.c:13722 [inline]
__se_sys_perf_event_open+0x193a/0x1d70 kernel/events/core.c:13364
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fda2ab8eec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fda2b9ab038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fda2ade5fa0 RCX: 00007fda2ab8eec9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 00002000000001c0
RBP: 00007fda2ac11f91 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda2ade6038 R14: 00007fda2ade5fa0 R15: 00007fff3ec72a38