rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10499 ticks this GP) idle=cc44/1/0x4000000000000000 softirq=8052/8054 fqs=1
(t=10501 jiffies g=6589 q=82 ncpus=2)
rcu: rcu_preempt kthread starved for 10500 jiffies! g6589 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:28192 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10ec/0x40b0 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: 4294 Comm: syz-executor373 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__lock_acquire+0x1051/0x7c50 kernel/locking/lockdep.c:5044
Code: 41 01 d6 29 da 41 89 dc 41 c1 c4 04 41 31 d4 48 c7 c0 68 80 1f 8e 48 c1 e8 03 42 0f b6 04 00 84 c0 0f 85 b4 5a 00 00 41 01 de <83> 3d 10 81 bc 0c 00 4c 8b bc 24 c0 00 00 00 0f 85 02 03 00 00 48
RSP: 0018:ffffc900000079c0 EFLAGS: 00000087
RAX: 0000000000000000 RBX: 00000000e33cdd05 RCX: 000000004b3978aa
RDX: 000000000c70359c RSI: 0000000000105208 RDI: ffffffff90add248
RBP: ffffc90000007c10 R08: dffffc0000000000 R09: fffffbfff215ba4a
R10: fffffbfff215ba4a R11: 1ffffffff215ba49 R12: 000000003fbde5c2
R13: 0000000000004049 R14: 00000000879fe4a6 R15: ffff88802cc36440
FS: 000055555cdde3c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2b241df50 CR3: 000000007c429000 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
timekeeping_get_delta kernel/time/timekeeping.c:254 [inline]
timekeeping_get_ns kernel/time/timekeeping.c:388 [inline]
ktime_get+0x7b/0x270 kernel/time/timekeeping.c:848
clockevents_program_event+0xe2/0x310 kernel/time/clockevents.c:326
hrtimer_interrupt+0x59d/0x9c0 kernel/time/hrtimer.c:1891
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline]
__sysvec_apic_timer_interrupt+0x153/0x5a0 arch/x86/kernel/apic/apic.c:1124
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
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 2e 31 43 f7 48 89 df e8 86 f6 43 f7 e8 91 e8 66 f7 fb bf 01 00 00 00 36 74 37 f7 65 8b 05 07 35 e2 75 85 c0 74 02 5b c3 e8 54 46 e0
RSP: 0018:ffffc90003f87bb8 EFLAGS: 00000286
RAX: e437e67cc4c31200 RBX: ffff88802f30c0c0 RCX: e437e67cc4c31200
RDX: dffffc0000000000 RSI: ffffffff8a8c0460 RDI: 0000000000000001
RBP: ffff88802f30c558 R08: dffffc0000000000 R09: ffffed1005e61819
R10: ffffed1005e61819 R11: 1ffff11005e61818 R12: 1ffff11005e618ab
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
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: 0033:0x7fa2b24068d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 19 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:00007ffe2c6b1bb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fa2b24068d9
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007fa2b23c6990 R09: 00007fa2b23c6990
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa2b246433c
R13: 00007fa2b245e106 R14: 00007ffe2c6b1bf0 R15: 0000000000000000
CPU: 1 PID: 4292 Comm: syz-executor373 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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 2e 31 43 f7 48 89 df e8 86 f6 43 f7 e8 91 e8 66 f7 fb bf 01 00 00 00 36 74 37 f7 65 8b 05 07 35 e2 75 85 c0 74 02 5b c3 e8 54 46 e0
RSP: 0018:ffffc90003e77bb8 EFLAGS: 00000286
RAX: a32e014c69d2c600 RBX: ffff88802ef92e40 RCX: a32e014c69d2c600
RDX: dffffc0000000000 RSI: ffffffff8a8c0460 RDI: 0000000000000001
RBP: ffff88802ef932d8 R08: dffffc0000000000 R09: ffffed1005df25c9
R10: ffffed1005df25c9 R11: 1ffff11005df25c8 R12: 1ffff11005df265b
R13: 0000000000000021 R14: dffffc0000000000 R15: 0000000000000000
FS: 000055555cdde3c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa2b241df50 CR3: 000000002f067000 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: 0033:0x7fa2b24068d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 19 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:00007ffe2c6b1bb8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007fa2b24068d9
RDX: 000020000006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007fa2b23c6990 R09: 00007fa2b23c6990
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa2b246433c
R13: 00007fa2b245e106 R14: 00007ffe2c6b1bf0 R15: 0000000000000000
sched: RT throttling activated