rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=106313, q=277 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10410 (4295035895-4295025485), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10410 jiffies! g106313 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:26664 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 schedule+0xbd/0x170 kernel/sched/core.c:6775
 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 20913 Comm: syz.3.3682 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:241 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x17/0x80 kernel/kcov.c:316
Code: 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 f3 0f 1e fa 48 8b 04 24 65 48 8b 0d 60 28 7c 7e 65 8b 15 61 28 7c 7e <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 57 83 b9 24 16 00 00
RSP: 0018:ffffc90000007668 EFLAGS: 00000046
RAX: ffffffff81af422d RBX: 0000000000000103 RCX: ffff88807d0b0000
RDX: 0000000000000103 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8e8c316f R09: 1ffffffff1d1862d
R10: dffffc0000000000 R11: fffffbfff1d1862e R12: ffffffff8d1858e0
R13: dffffc0000000000 R14: ffff8880b8e00000 R15: dffffc0000000000
FS:  00007f0e1767e6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000061e55000 CR4: 00000000003506f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 interrupt_context_level include/linux/preempt.h:95 [inline]
 get_recursion_context kernel/events/internal.h:214 [inline]
 perf_swevent_get_recursion_context+0x7d/0x150 kernel/events/core.c:9979
 perf_trace_buf_alloc+0x59/0x290 kernel/trace/trace_event_perf.c:410
 perf_trace_preemptirq_template+0x144/0x330 include/trace/events/preemptirq.h:14
 trace_irq_disable+0xbb/0xe0 include/trace/events/preemptirq.h:36
 irqentry_enter+0x37/0x50 kernel/entry/common.c:384
 sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1088
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:queue_work_on+0x1a4/0x1f0 kernel/workqueue.c:1863
Code: 4d 85 e4 75 16 e8 7c b1 2f 00 eb 15 e8 75 b1 2f 00 e8 00 71 39 09 4d 85 e4 74 ea e8 66 b1 2f 00 fb 48 c7 44 24 20 0e 36 e0 45 <48> b8 00 00 00 00 00 fc ff df 49 c7 44 05 00 00 00 00 00 41 c7 44
RSP: 0018:ffffc900000078a0 EFLAGS: 00000246
RAX: ffffffff8157d9ea RBX: 0000000000000001 RCX: ffff88807d0b0000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007970 R08: ffffffff911eb5ff R09: 1ffffffff223d6bf
R10: dffffc0000000000 R11: fffffbfff223d6c0 R12: 0000000000000200
R13: 1ffff92000000f18 R14: 0000000000000000 R15: 0000000000000000
 queue_work include/linux/workqueue.h:564 [inline]
 schedule_work include/linux/workqueue.h:625 [inline]
 __rhashtable_remove_fast_one include/linux/rhashtable.h:1069 [inline]
 __rhashtable_remove_fast include/linux/rhashtable.h:1093 [inline]
 rhashtable_remove_fast include/linux/rhashtable.h:1122 [inline]
 inet_frag_kill+0xf26/0x1080 net/ipv4/inet_fragment.c:279
 ip_expire+0x20f/0x850 net/ipv4/ip_fragment.c:143
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x570/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x27d/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 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:generic_exec_single+0x477/0x4e0 kernel/smp.c:418
Code: 75 11 e8 2c 10 0b 00 48 85 db 75 16 e8 22 10 0b 00 eb 15 e8 1b 10 0b 00 e8 a6 cf 14 09 48 85 db 74 ea e8 0c 10 0b 00 fb 31 c0 <48> c7 44 24 20 0e 36 e0 45 4b c7 04 2c 00 00 00 00 43 c7 44 2c 08
RSP: 0018:ffffc9000bd1fa00 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000200 RCX: ffff88807d0b0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000bd1fad0 R08: ffffffff911eb5ff R09: 1ffffffff223d6bf
R10: dffffc0000000000 R11: fffffbfff223d6c0 R12: 1ffff920017a3f44
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff920017a3f65
 smp_call_function_single+0x36d/0x5a0 kernel/smp.c:647
 task_function_call kernel/events/core.c:120 [inline]
 perf_install_in_context+0x5bb/0x920 kernel/events/core.c:2958
 __do_sys_perf_event_open kernel/events/core.c:12967 [inline]
 __se_sys_perf_event_open+0x1818/0x1d40 kernel/events/core.c:12609
 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: 0033:0x7f0e1679e159
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:00007f0e1767e028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f0e16a25fa0 RCX: 00007f0e1679e159
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007f0e1683506b R08: 000000000000000a R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e16a26038 R14: 00007f0e16a25fa0 R15: 00007ffc45649798
 </TASK>