rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 ticks this GP) idle=4a7/1/0x4000000000000000 softirq=21424/21424 fqs=4896 
	(detected by 1, t=10502 jiffies, g=27409, q=310937)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8714 Comm: syz.1.4009 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:pvclock_clocksource_read+0xb4/0x770 arch/x86/kernel/pvclock.c:68
Code: 03 48 89 44 24 68 49 8d 4a 07 48 89 4c 24 40 48 c1 e9 03 48 89 4c 24 60 48 8d 4f 1d 48 89 4c 24 30 48 c1 e9 03 48 89 4c 24 58 <49> bc 00 00 00 00 00 fc ff df 48 89 54 24 38 42 0f b6 04 22 84 c0
RSP: 0018:ffffc900000077f0 EFLAGS: 00000807
RAX: 1ffffffff1fe7802 RBX: 1ffffffff1fe7800 RCX: 1ffffffff1fe7803
RDX: 1ffffffff1fe7800 RSI: ffffffff8ff3c01c RDI: ffffffff8ff3c000
RBP: 0000000000010000 R08: ffffffff8ff3c008 R09: ffffffff8ff3c018
R10: ffffffff8ff3c010 R11: ffffffff8ff3c003 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888057dc0000 R15: ffffffff8be64820
FS:  000055555d43f500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000004d433 CR3: 000000005eb1a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 kvm_clock_read arch/x86/kernel/kvmclock.c:79 [inline]
 kvm_sched_clock_read+0x14/0x40 arch/x86/kernel/kvmclock.c:91
 sched_clock_cpu+0x15/0x3c0 kernel/sched/clock.c:371
 irqtime_account_irq+0x6a/0x1b0 kernel/sched/cputime.c:61
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x45/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x7f/0x4a0 kernel/rcu/tree_plugin.h:674
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 d2 f6 9c 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007a20 EFLAGS: 00000206
RAX: 4affa68e857c7200 RBX: 1ffff92000000f48 RCX: 4affa68e857c7200
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a5100
RBP: ffffc90000007b00 R08: ffffffff910471d7 R09: 1ffffffff2208e3a
R10: dffffc0000000000 R11: fffffbfff2208e3b R12: ffffffff8d123400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:772 [inline]
 br_forward_delay_timer_expired+0x325/0x3f0 net/bridge/br_stp_timer.c:99
 call_timer_fn+0x17b/0x540 kernel/time/timer.c:1648
 expire_timers kernel/time/timer.c:1699 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:1970
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1983
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:exit_to_user_mode_loop+0x40/0x130 kernel/entry/common.c:171
Code: fb eb 1d e8 b2 4d 62 08 65 48 8b 05 9a 21 9b 7e 4c 8b 30 41 f7 c6 0e 30 02 00 0f 84 ed 00 00 00 e8 35 0b 18 00 fb 41 f6 c6 08 <74> 05 e8 f9 85 6a 08 41 f7 c6 00 10 00 00 74 08 48 89 df e8 c8 97
RSP: 0018:ffffc90005147ed0 EFLAGS: 00000246
RAX: 4affa68e857c7200 RBX: ffffc90005147f58 RCX: 4affa68e857c7200
RDX: dffffc0000000000 RSI: ffffffff8a2b2b60 RDI: ffffffff8a7a5100
RBP: ffffc90005147f48 R08: ffff8880b8e3b30b R09: 1ffff110171c7661
R10: dffffc0000000000 R11: ffffed10171c7662 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: ffff888057dc0000
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
 __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0cba0fdb19
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:00007ffd1f280d38 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffd1f280e20 RCX: 00007f0cba0fdb19
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000004d433 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b30920000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0cba383fac R14: 00007f0cba383fa8 R15: 00007f0cba383fa0
 </TASK>