rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=ab5c/1/0x4000000000000000 softirq=2511/2511 fqs=16
rcu: (detected by 0, t=10002 jiffies, g=6161, q=596 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 7132 Comm: syz.0.2234 Not tainted syzkaller #0 00ad55236d4531c7fb9f608a968d4071287717d4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:kasan_check_range+0x1d2/0x2a0 mm/kasan/generic.c:-1
Code: 85 ed 49 0f 49 dd 48 83 e3 f8 49 29 dd 74 12 41 80 3b 00 0f 85 ab 00 00 00 49 ff c3 49 ff cd 75 ee 5b 41 5c 41 5d 41 5e 41 5f <5d> c3 cc cc cc cc cc 45 84 ff 75 61 41 f7 c7 00 ff 00 00 75 5d 41
RSP: 0018:ffffc90007dafc20 EFLAGS: 00000097
RAX: f300f204f1f1f101 RBX: ffffffff889e9040 RCX: ffffffff858dcbf2
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff889e9040
RBP: ffffc90007dafc20 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff113d208 R12: dffffc0000000000
R13: 1ffff92000fb5f88 R14: 0000000000000806 R15: ffffc90007dafc60
FS: 0000555560f70500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 000000013ee1a000 CR4: 00000000003526b0
Call Trace:
__kasan_check_write+0x18/0x20 mm/kasan/shadow.c:37
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1300 [inline]
queued_spin_lock include/asm-generic/qspinlock.h:111 [inline]
do_raw_spin_lock include/linux/spinlock.h:187 [inline]
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0xa2/0x150 kernel/locking/spinlock.c:162
vga_put drivers/pci/vgaarb.c:547 [inline]
vga_arb_release+0x20f/0x950 drivers/pci/vgaarb.c:1455
__fput+0x1fb/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e3/0x250 kernel/task_work.c:240
resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f43a938ebe9
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:00007ffdd4463af8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000022775 RCX: 00007f43a938ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f43a95b7da0 R08: 0000000000000001 R09: 00000025d4463def
R10: 0000001b2d120000 R11: 0000000000000246 R12: 00007f43a95b5fac
R13: 00007f43a95b5fa0 R14: ffffffffffffffff R15: 00007ffdd4463c10
rcu: rcu_preempt kthread starved for 9970 jiffies! g6161 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:0 pid:18 tgid:18 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_timeout+0x139/0x3a0 kernel/time/timer.c:2619
rcu_gp_fqs_loop+0x2f2/0x12f0 kernel/rcu/tree.c:2053
rcu_gp_kthread+0x99/0x380 kernel/rcu/tree.c:2255
kthread+0x2c7/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 00ad55236d4531c7fb9f608a968d4071287717d4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events jump_label_update_timeout
RIP: 0010:csd_lock_wait kernel/smp.c:349 [inline]
RIP: 0010:smp_call_function_many_cond+0xa29/0xf30 kernel/smp.c:884
Code: 00 89 de 83 e6 01 31 ff e8 14 2a 0a 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 07 e8 c0 25 0a 00 eb 38 f3 90 41 0f b6 04 1e <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 a4 25 0a 00 eb e4 44
RSP: 0018:ffffc90000097900 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888102653900
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000097a38 R08: ffff8881f6e50e97 R09: 1ffff1103edca1d2
R10: 0000000000000000 R11: ffffffff813b8630 R12: ffff8881f6e50e88
R13: ffff8881f6f720a8 R14: 1ffff1103edee415 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3e07d212c0 CR3: 00000000072a8000 CR4: 00000000003526b0
Call Trace:
on_each_cpu_cond_mask+0x44/0x90 kernel/smp.c:1051
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:2284 [inline]
text_poke_bp_batch+0x211/0x6d0 arch/x86/kernel/alternative.c:2494
text_poke_flush arch/x86/kernel/alternative.c:2685 [inline]
text_poke_finish+0x34/0x60 arch/x86/kernel/alternative.c:2692
arch_jump_label_transform_apply+0x1e/0x40 arch/x86/kernel/jump_label.c:146
__jump_label_update+0x37c/0x3a0 kernel/jump_label.c:521
jump_label_update+0x395/0x440 kernel/jump_label.c:920
__static_key_slow_dec_cpuslocked+0xb7/0x110 kernel/jump_label.c:315
__static_key_slow_dec kernel/jump_label.c:321 [inline]
jump_label_update_timeout+0x22/0x30 kernel/jump_label.c:329
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0x7d5/0x1020 kernel/workqueue.c:3319
worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
kthread+0x2c7/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244