rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 1, t=10502 jiffies, g=5965, q=6 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294966818-4294956315), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10504 jiffies! g5965 f0x2 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:27968 pid:17 tgid:17 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0xf15/0x5c80 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0xe7/0x270 kernel/sched/core.c:6817
schedule_timeout+0x136/0x290 kernel/time/timer.c:2183
rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1631
rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:1830
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
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: 5100 Comm: syz-executor289 Not tainted 6.7.0-rc6-next-20231222-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x20 kernel/kcov.c:304
Code: 00 00 f3 0f 1e fa 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 c8 fe ff ff 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 8b 0c 24 <89> f2 89 fe bf 05 00 00 00 e9 aa fe ff ff 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc90000007cd0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88802237bb80 RCX: ffffffff815227e5
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff1e74b62
R10: ffffffff8f3a5b17 R11: ffffc90000007ff8 R12: ffffc90000007d70
R13: 0000000000000001 R14: 1ffff92000000faa R15: ffff88802237bb80
FS: 00005555575023c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002006b000 CR3: 000000002191b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_read_lock include/linux/rcupdate.h:751 [inline]
__lock_task_sighand+0x55/0x340 kernel/signal.c:1396
lock_task_sighand include/linux/sched/signal.h:748 [inline]
send_sigqueue+0x1d4/0x840 kernel/signal.c:1987
posix_timer_event kernel/time/posix-timers.c:298 [inline]
posix_timer_fn+0x181/0x3d0 kernel/time/posix-timers.c:324
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
__sysvec_apic_timer_interrupt+0x10c/0x410 arch/x86/kernel/apic/apic.c:1082
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 7a 4b d8 f6 48 89 df e8 42 c3 d8 f6 e8 6d ad fe f6 fb bf 01 00 00 00 92 6c ca f6 65 8b 05 b3 a7 73 75 85 c0 74 02 5b c3 e8 00 66 70
RSP: 0018:ffffc90003cefd00 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff88801576ae40 RCX: 1ffffffff1e751db
RDX: 0000000000000000 RSI: ffffffff8b2f95c0 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8f3a5b17 R11: ffffffff8acf3060 R12: ffff88801576b2d8
R13: 0000000000000021 R14: ffff88801576b240 R15: 1ffff9200079dfaf
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1879/0x2760 kernel/signal.c:2896
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11e/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7fbd4b8b2e79
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff0a7fe0d8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fbd4b8b2e79
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000555557502370
R13: 0000000000000005 R14: 00007fff0a7fe150 R15: 00007fff0a7fe140
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.522 msecs