rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5210/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=30873, q=608 ncpus=2)
task:udevd state:R running task stack:25352 pid:5210 tgid:5210 ppid:1 task_flags:0x400140 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x165c/0x5560 kernel/sched/core.c:6964
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7292
irqentry_exit+0x5e4/0x700 kernel/entry/common.c:240
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5872
Code: ff ff ff e8 81 20 19 0a f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 2b 1d a0 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 d0 0c 1c 0a cc 48 8d 3d a8 e7 94
RSP: 0018:ffffc900031678e0 EFLAGS: 00000282
RAX: ad784d746f506900 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005a44979c RSI: ffffffff8e2d5414 RDI: ffffffff8c2a8e80
RBP: ffffffff81b04e1d R08: ffffffff81b04e1d R09: ffffffff8e95d7e0
R10: ffffc900031679f8 R11: ffffffff81b1dc30 R12: 0000000000000002
R13: ffffffff8e95d7e0 R14: 0000000000000000 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
class_rcu_constructor include/linux/rcupdate.h:1193 [inline]
is_module_text_address+0x39/0x1e0 kernel/module/main.c:3927
kernel_text_address+0x94/0xe0 kernel/extable.c:119
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6242 [inline]
kmem_cache_free+0x182/0x650 mm/slub.c:6369
class_filename_destructor include/linux/fs.h:2547 [inline]
do_sys_openat2+0x14c/0x200 fs/open.c:1367
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1383
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa9395e2407
RSP: 002b:00007ffea5bd1ff0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fa939556880 RCX: 00007fa9395e2407
RDX: 0000000000080141 RSI: 00005643b0a5102e RDI: ffffffffffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001a4 R11: 0000000000000202 R12: 00000000ffffffff
R13: 00000000ffffffff R14: ffffffffffffffff R15: 00007ffea5bd2310
rcu: rcu_preempt kthread starved for 10342 jiffies! g30873 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:27512 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5352 [inline]
__schedule+0x165c/0x5560 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7047 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7062
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 7127 Comm: vhost-7126 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 89 fb e8 23 00 00 00 48 8b 3d 94 3e 6b 0c 48 89 de 5b e9 e3 13 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0d 78 2e 7c 11 65 8b 15 99 2e 7c
RSP: 0018:ffffc90003dff9d0 EFLAGS: 00000046
RAX: 1ffff1100b5a89a8 RBX: ffff88805ad44d30 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff88805ad44d30
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: ffffffff890b8440 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88805ad44d40
FS: 00007f6063e986c0(0000) GS:ffff888124ff3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 0000000079752000 CR4: 00000000003526f0
Call Trace:
vhost_poll_wakeup+0x21/0x140 drivers/vhost/vhost.c:174
__wake_up_common kernel/sched/wait.c:108 [inline]
__wake_up_locked_key+0xe7/0x160 kernel/sched/wait.c:166
eventfd_signal_mask+0x13a/0x1f0 fs/eventfd.c:76
eventfd_signal include/linux/eventfd.h:89 [inline]
vhost_update_used_flags+0x221/0x2b0 drivers/vhost/vhost.c:2580
vhost_disable_notify+0xad/0x1d0 drivers/vhost/vhost.c:3258
vhost_vsock_handle_tx_kick+0x163/0x10a0 drivers/vhost/vsock.c:526
vhost_run_work_list+0x14d/0x1e0 drivers/vhost/vhost.c:454
vhost_task_fn+0x2ef/0x4a0 kernel/vhost_task.c:49
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245