rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P3545/1:b..l
	(detected by 1, t=10503 jiffies, g=5801, q=63)
task:udevd           state:R  running task     stack:22328 pid: 3545 ppid:     1 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777
 irqentry_exit+0x53/0x80 kernel/entry/common.c:432
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x252/0x4f0 kernel/locking/lockdep.c:5627
Code: 2b 00 74 08 4c 89 f7 e8 9c 9e 67 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc900012df400 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff9200025be8c RCX: 1ffff9200025be2c
RDX: dffffc0000000000 RSI: ffffffff8aab3e20 RDI: ffffffff8af9f2c0
RBP: ffffc900012df548 R08: dffffc0000000000 R09: fffffbfff2131821
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff9200025be88
R13: dffffc0000000000 R14: ffffc900012df460 R15: 0000000000000246
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312
 rcu_read_lock include/linux/rcupdate.h:739 [inline]
 dput+0x35/0x1a0 fs/dcache.c:879
 step_into+0x352/0xe90 fs/namei.c:1815
 walk_component+0x359/0x610 fs/namei.c:1982
 link_path_walk+0x642/0xd90
 path_openat+0x249/0x2f20 fs/namei.c:3738
 do_filp_open+0x21c/0x460 fs/namei.c:3769
 do_sys_openat2+0x13b/0x4f0 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f96fd687477
RSP: 002b:00007ffc43280938 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055fc14228740 RCX: 00007f96fd687477
RDX: 0000000000090800 RSI: 000055fc14217a90 RDI: 00000000ffffff9c
RBP: 000055fc142f5850 R08: 0000000000090800 R09: 000055fc14217a90
R10: 0000000000000000 R11: 0000000000000287 R12: 000055fc14217a90
R13: 00000000000000fd R14: 000055fbe27d81c4 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread starved for 10542 jiffies! g5801 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:27032 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914
 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145
 kthread+0x3f6/0x4f0 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4362 Comm: syz.1.32 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x60 kernel/kcov.c:205
Code: 00 00 00 0f 1f 00 53 48 89 fb e8 17 00 00 00 48 8b 3d 18 04 8a 0c 48 89 de 5b e9 47 11 49 00 cc cc cc cc cc cc cc 48 8b 04 24 <65> 48 8b 0d 24 ea 81 7e 65 8b 15 25 ea 81 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc9000318feb8 EFLAGS: 00000046
RAX: ffffffff812f171c RBX: 0000000000000000 RCX: ffff888029df3b80
RDX: ffff888029df3b80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff812f1713 R09: ffffed10053be771
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888029df54c0
FS:  00007fcf930346c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2a36d9 CR3: 0000000062881000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 fpregs_assert_state_consistent+0xac/0xe0 arch/x86/kernel/fpu/core.c:420
 arch_exit_to_user_mode_prepare arch/x86/include/asm/entry-common.h:56 [inline]
 exit_to_user_mode_prepare+0x58/0x140 kernel/entry/common.c:216
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fcf951f3520
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 2a 15 08 00 e8 f5 8f f8 ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007fcf93033b38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fcf953e3fa8 RCX: 00007fcf951cade9
RDX: 00007fcf93033b40 RSI: 00007fcf93033c70 RDI: 0000000000000021
RBP: 00007fcf953e3fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcf953e3fac
R13: 0000000000000000 R14: 00007fff67be3ee0 R15: 00007fff67be3fc8
 </TASK>