rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=d86c/1/0x4000000000000000 softirq=22150/22153 fqs=1
rcu: (detected by 0, t=10505 jiffies, g=26073, q=151 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5141 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:preempt_count_sub+0x5/0x160 kernel/sched/core.c:5868
Code: 6e ff ff ff 48 c7 c7 e0 9f 8c 8e e8 d5 f3 82 00 89 df e9 5b ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 f3 0f 1e fa 55 <53> 48 bb 00 00 00 00 00 fc ff df 48 c7 c0 80 e4 2e 97 48 c1 e8 03
RSP: 0018:ffffc900001f0cb0 EFLAGS: 00000046
RAX: dffffc0000000004 RBX: 0000000000000802 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffffc900001f0d50 R08: ffff8880b8f2b743 R09: 1ffff110171e56e8
R10: dffffc0000000000 R11: ffffed10171e56e9 R12: dffffc0000000000
R13: ffff888024d5f340 R14: ffff8880b8f2b740 R15: 1ffff9200003e198
FS: 00007f43807bc880(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2db23ffc CR3: 0000000019a93000 CR4: 00000000003506e0
Call Trace:
<IRQ>
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xc5/0x120 kernel/locking/spinlock.c:194
__run_hrtimer kernel/time/hrtimer.c:1750 [inline]
__hrtimer_run_queues+0x426/0xc10 kernel/time/hrtimer.c:1818
hrtimer_interrupt+0x39d/0x980 kernel/time/hrtimer.c:1880
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:50 [inline]
RIP: 0010:unwind_next_frame+0x9f/0x2990 arch/x86/kernel/unwind_orc.c:475
Code: 65 38 4c 89 eb 48 c1 eb 03 42 0f b6 04 3b 84 c0 0f 85 f5 21 00 00 41 8b 6d 00 31 ff 89 ee e8 b8 c4 4b 00 89 ac 24 94 00 00 00 <85> ed 74 76 4c 89 74 24 60 48 89 5c 24 18 bf 01 00 00 00 e8 49 43
RSP: 0018:ffffc90003317918 EFLAGS: 00000293
RAX: ffffffff813b2468 RBX: 1ffff92000662f3d RCX: 0000000000000000
RDX: ffff88807def5a00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffc90003317ab0 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc90003317a80
R13: ffffc900033179e8 R14: ffffc90003317a20 R15: dffffc0000000000
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x290 mm/slub.c:3852
file_free fs/file_table.c:95 [inline]
__fput+0x5eb/0x940 fs/file_table.c:431
__do_sys_close fs/open.c:1574 [inline]
__se_sys_close+0x15c/0x1e0 fs/open.c:1559
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4380115a67
Code: 44 00 00 48 83 ec 10 48 63 ff 45 31 c9 45 31 c0 6a 01 31 c9 e8 ca 19 f9 ff 48 83 c4 18 c3 0f 1f 44 00 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 61 b3 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007ffd41fa1be8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000557d4757ff10 RCX: 00007f4380115a67
RDX: fffffffffffff000 RSI: 00007f43801f1b20 RDI: 000000000000000d
RBP: 0000557d47560030 R08: 000000000000b420 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000202 R12: 0000557d4756b7b0
R13: 00000000000000ff R14: 0000557d10eb2be0 R15: 00007ffd41fa1e60
</TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g26073 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:27848 pid:17 ppid:2 flags:0x00004000
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0x188/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x30d/0x1590 kernel/rcu/tree.c:1667
rcu_gp_kthread+0x9d/0x3b0 kernel/rcu/tree.c:1866
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 7688 Comm: syz.4.523 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_many_cond+0xd85/0x1190 kernel/smp.c:855
Code: 45 8b 34 24 44 89 f6 83 e6 01 31 ff e8 54 f1 0a 00 41 83 e6 01 49 be 00 00 00 00 00 fc ff df 75 07 e8 8f ed 0a 00 eb 38 f3 90 <42> 0f b6 04 33 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 73 ed
RSP: 0018:ffffc900136df9c0 EFLAGS: 00000246
RAX: ffffffff817bf7fd RBX: 1ffff110171e82bd RCX: 0000000000080000
RDX: ffffc90018f0d000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900136dfb40 R08: ffffffff911e7507 R09: 1ffffffff223cea0
R10: dffffc0000000000 R11: fffffbfff223cea1 R12: ffff8880b8f415e8
R13: ffff8880b8e3d3c0 R14: dffffc0000000000 R15: 0000000000000001
FS: 00007f7d762b96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c35941a CR3: 000000002fe85000 CR4: 00000000003506f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1022
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:2222 [inline]
text_poke_bp_batch+0x31e/0x980 arch/x86/kernel/alternative.c:2432
text_poke_flush arch/x86/kernel/alternative.c:2623 [inline]
text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2630
arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
static_key_enable_cpuslocked+0x123/0x240 kernel/jump_label.c:207
static_key_enable+0x1a/0x20 kernel/jump_label.c:220
__sched_core_enable kernel/sched/core.c:398 [inline]
sched_core_get+0xb3/0x180 kernel/sched/core.c:422
sched_core_alloc_cookie+0x71/0xa0 kernel/sched/core_sched.c:18
sched_core_share_pid+0x30e/0x7a0 kernel/sched/core_sched.c:185
__do_sys_prctl kernel/sys.c:2727 [inline]
__se_sys_prctl+0x3bb/0x1510 kernel/sys.c:2453
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f7d7539de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7d762b9028 EFLAGS: 00000246 ORIG_RAX: 000000000000009d
RAX: ffffffffffffffda RBX: 00007f7d75625fa0 RCX: 00007f7d7539de59
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000003e
RBP: 00007f7d75433e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d75626038 R14: 00007f7d75625fa0 R15: 00007ffec37fcfd8
</TASK>