rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P6288/1:b..l
rcu: 	(detected by 0, t=10503 jiffies, g=13757, q=838 ncpus=2)
task:udevd           state:R  running task     stack:25592 pid:6288  tgid:6288  ppid:5199   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__kasan_check_byte+0x2d/0x40 mm/kasan/common.c:578
Code: d6 41 56 53 48 89 f3 49 89 fe e8 3e 15 00 00 84 c0 75 16 be 01 00 00 00 4c 89 f7 31 d2 48 89 d9 89 c3 e8 36 04 00 00 89 d8 5b <41> 5e c3 cc cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90
RSP: 0018:ffffc9000bce7680 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 7a0fa8ba56d03600
RDX: 0000000000000000 RSI: ffffffff82656de8 RDI: 1ffffffff1c27f14
RBP: ffffffff82656dcc R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed102808c025 R12: 0000000000000002
R13: ffffffff8e13f8a0 R14: ffffffff8e13f8a0 R15: 0000000000000000
 kasan_check_byte include/linux/kasan.h:402 [inline]
 lock_acquire+0x84/0x340 kernel/locking/lockdep.c:5842
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1195 [inline]
 kernfs_root+0x38/0x230 fs/kernfs/kernfs-internal.h:75
 kernfs_root_is_locked fs/kernfs/kernfs-internal.h:109 [inline]
 kernfs_parent+0x51/0x190 fs/kernfs/kernfs-internal.h:133
 kernfs_get_target_path fs/kernfs/symlink.c:67 [inline]
 kernfs_getlink fs/kernfs/symlink.c:122 [inline]
 kernfs_iop_get_link+0x139/0x6c0 fs/kernfs/symlink.c:140
 pick_link+0x732/0xfa0 fs/namei.c:-1
 step_into_slowpath+0x53b/0x7d0 fs/namei.c:2066
 step_into fs/namei.c:2091 [inline]
 open_last_lookups fs/namei.c:4574 [inline]
 path_openat+0x226d/0x3840 fs/namei.c:4783
 do_filp_open+0x1fa/0x410 fs/namei.c:4813
 do_sys_openat2+0x121/0x200 fs/open.c:1391
 do_sys_open fs/open.c:1397 [inline]
 __do_sys_openat fs/open.c:1413 [inline]
 __se_sys_openat fs/open.c:1408 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1408
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4e800a7407
RSP: 002b:00007ffd45d1d050 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4e8079a880 RCX: 00007f4e800a7407
RDX: 0000000000080000 RSI: 00005605b4e3f410 RDI: ffffffffffffff9c
RBP: 00005605b4e3f410 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000009
 </TASK>
rcu: rcu_preempt kthread starved for 10537 jiffies! g13757 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:27344 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5258 [inline]
 __schedule+0x150e/0x5070 kernel/sched/core.c:6866
 __schedule_loop kernel/sched/core.c:6948 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6963
 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+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </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 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 4e 2b 00 f3 0f 1e fa fb f4 <e9> 48 ee 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: 623fe751f6716f00 RBX: ffffffff8197888a RCX: 623fe751f6716f00
RDX: 0000000000000001 RSI: ffffffff8d99597b RDI: ffffffff8be075e0
RBP: ffffc90000197f10 R08: ffff8880b87336db R09: 1ffff110170e66db
R10: dffffc0000000000 R11: ffffed10170e66dc R12: ffffffff8fa20e70
R13: 1ffff11003adcb70 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d2d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc34d531c9c CR3: 00000000308d6000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x1ea/0x520 kernel/sched/idle.c:332
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:430
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>