rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10500 ticks this GP) idle=bfdc/1/0x4000000000000000 softirq=7806/7806 fqs=3
(t=10502 jiffies g=6805 q=141 ncpus=2)
rcu: rcu_preempt kthread starved for 10497 jiffies! g6805 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:26912 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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: 4286 Comm: syz-executor583 Not tainted 6.1.138-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:__lock_acquire+0x18a/0x7c50 kernel/locking/lockdep.c:4948
Code: 49 b8 00 00 00 00 00 fc ff df 49 89 c7 48 85 c0 0f 84 6e 58 00 00 4d 8d b4 24 d8 0a 00 00 4c 89 f0 48 c1 e8 03 48 89 44 24 70 <42> 0f b6 04 00 84 c0 0f 85 bc 64 00 00 41 8b 06 48 89 44 24 60 48
RSP: 0018:ffffc90003df75c0 EFLAGS: 00000802
RAX: 1ffff11005db28cb RBX: ffffffff8c943ec8 RCX: 1ffff920007beedc
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8c943ec8
RBP: ffffc90003df7810 R08: dffffc0000000000 R09: 0000000000000001
R10: fffffbfff1bfd046 R11: 1ffffffff1bfd045 R12: ffff88802ed93b80
R13: 0000000000000001 R14: ffff88802ed94658 R15: ffffffff90243700
FS: 0000555590c763c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 000000007c3cd000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662
seqcount_lockdep_reader_access+0xc6/0x1c0 include/linux/seqlock.h:102
ktime_get+0x31/0x270 kernel/time/timekeeping.c:846
clockevents_program_event+0xe2/0x310 kernel/time/clockevents.c:326
hrtimer_start_range_ns+0xa9a/0xc20 kernel/time/hrtimer.c:1293
posixtimer_rearm+0x131/0x340 kernel/time/posix-timers.c:328
dequeue_signal+0x1b6/0x4b0 kernel/signal.c:704
get_signal+0x547/0x1350 kernel/signal.c:2751
arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4ba1afd259
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1a 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:00007ffd3150c038 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f4ba1afd259
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4ba1b54149
R13: 00007ffd3150c360 R14: 00007ffd3150c070 R15: 0000000000000000
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.162 msecs
CPU: 1 PID: 4284 Comm: syz-executor583 Not tainted 6.1.138-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: f5 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 4e 1b 4a f7 48 89 df e8 a6 e0 4a f7 e8 11 e3 6d f7 fb bf 01 00 00 00 b6 5d 3e f7 65 8b 05 b7 22 e9 75 85 c0 74 02 5b c3 e8 04 34 e7
RSP: 0018:ffffc90003d27bb8 EFLAGS: 00000286
RAX: 83b509c578071d00 RBX: ffff88802e7be5c0 RCX: 83b509c578071d00
RDX: dffffc0000000000 RSI: ffffffff8a6bfe00 RDI: 0000000000000001
RBP: ffff88802e7bea58 R08: dffffc0000000000 R09: ffffed1005cf7cb9
R10: ffffed1005cf7cb9 R11: 1ffff11005cf7cb8 R12: 1ffff11005cf7d4b
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000555590c763c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 00000000788ca000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
spin_unlock_irq include/linux/spinlock.h:401 [inline]
get_signal+0x1163/0x1350 kernel/signal.c:2874
arch_do_signal_or_restart+0xb0/0x1230 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f4ba1afc2da
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 23 87 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 83 87 02 00 8b 44 24
RSP: 002b:00007ffd3150c020 EFLAGS: 00000293
RAX: fffffffffffffff7 RBX: 0000000000000004 RCX: 00007f4ba1afc2da
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f4ba1b54149
R13: 00007ffd3150c360 R14: 00007ffd3150c070 R15: 0000000000000000