rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (9395 ticks this GP) idle=05e4/1/0x4000000000000000 softirq=12679/12683 fqs=4854
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1101303        342            0
rcu: 	cputime:    21204      31281           43   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=11249 q=1695 ncpus=2)
CPU: 0 PID: 5936 Comm: syz.3.21 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:preempt_count_sub+0x4/0x160 kernel/sched/core.c:5868
Code: 8c 6e ff ff ff 48 c7 c7 e0 9f 8c 8e e8 d5 f3 82 00 89 df e9 5b ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 f3 0f 1e fa <55> 53 48 bb 00 00 00 00 00 fc ff df 48 c7 c0 80 e4 2e 97 48 c1 e8
RSP: 0018:ffffc90000007a38 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: c79b328d0a83eb00
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: 0000000000000001
RBP: ffffc90000007ac0 R08: ffffffff911e75ef R09: 1ffffffff223cebd
R10: dffffc0000000000 R11: fffffbfff223cebe R12: dffffc0000000000
R13: ffff8880b8e295c0 R14: ffff8880b8e295c0 R15: 1ffff92000000f48
FS:  00005555818f1500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f74436737e0 CR3: 0000000076345000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0xc5/0x120 kernel/locking/spinlock.c:194
 __mod_timer+0x9b0/0xd60 kernel/time/timer.c:1134
 mrp_join_timer_arm net/802/mrp.c:596 [inline]
 mrp_join_timer+0x13f/0x170 net/802/mrp.c:611
 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:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 51 51 c8 f6 e8 9c 3c f9 f6 fb bf 01 00 00 00 <e8> 31 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc90003507da0 EFLAGS: 00000286
RAX: c79b328d0a83eb00 RBX: 0000000000000000 RCX: c79b328d0a83eb00
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: 0000000000000001
RBP: ffffc90003507e40 R08: ffffffff8e8c6b2f R09: 1ffffffff1d18d65
R10: dffffc0000000000 R11: fffffbfff1d18d66 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920006a0fb4
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2e/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 e9 fa ff ff 66 90 66 90 e8 80 84 01 f7 e8 3b 84 01 f7 fb 65 48 8b 05 52 e9 77 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 cd d0 e7 f6 48
RSP: 0018:ffffc90003507f08 EFLAGS: 00000286
RAX: ffff88802eb19e00 RBX: 00000000000001b4 RCX: c79b328d0a83eb00
RDX: dffffc0000000000 RSI: ffffffff8acacb60 RDI: ffffffff8b1cfa20
RBP: ffffc90003507f48 R08: ffffffff8e8c6b2f R09: 1ffffffff1d18d65
R10: dffffc0000000000 R11: fffffbfff1d18d66 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003507f58 R15: 0000000000000000
 do_syscall_64+0x28/0xb0 arch/x86/entry/common.c:72
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f744379de99
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:00007ffdc3b670f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007ffdc3b671e0 RCX: 00007f744379de99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000001b552 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2c420000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7443a25fac R14: 00007f7443a25fa8 R15: 00007f7443a25fa0
 </TASK>