rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-....: (1 GPs behind) idle=6f2/1/0x4000000000000002 softirq=443021/443023 fqs=5249
(t=10502 jiffies g=525441 q=2396)
NMI backtrace for cpu 1
CPU: 1 PID: 28581 Comm: syz-executor.2 Not tainted 5.5.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x197/0x210 lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
rcu_pending kernel/rcu/tree.c:2827 [inline]
rcu_sched_clock_irq.cold+0x509/0xc0d kernel/rcu/tree.c:2271
update_process_times+0x2d/0x70 kernel/time/timer.c:1726
tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
__run_hrtimer kernel/time/hrtimer.c:1517 [inline]
__hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:check_kcov_mode kernel/kcov.c:153 [inline]
RIP: 0010:write_comp_data+0x10/0x70 kernel/kcov.c:208
Code: 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 c0 1e 02 00 65 8b 05 38 f7 8c 7e 00 01 1f 00 75 51 41 8b 80 80 13 00 00 83 f8 03 75 45 49 8b 80
RSP: 0018:ffffc90004027568 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000201 RBX: 0000000000000001 RCX: ffffffff86478eec
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc90004027570 R08: ffff88821b35a2c0 R09: fffffbfff165ebbd
R10: fffffbfff165ebbc R11: ffffffff8b2f5de7 R12: ffff8880949ee338
R13: ffff8880949ee320 R14: dffffc0000000000 R15: ffff8880949ee320
cbq_dequeue_prio net/sched/sch_cbq.c:774 [inline]
cbq_dequeue_1 net/sched/sch_cbq.c:792 [inline]
cbq_dequeue+0x1acc/0x22a0 net/sched/sch_cbq.c:816
dequeue_skb net/sched/sch_generic.c:263 [inline]
qdisc_restart net/sched/sch_generic.c:366 [inline]
__qdisc_run+0x1a5/0x1770 net/sched/sch_generic.c:384
__dev_xmit_skb net/core/dev.c:3677 [inline]
__dev_queue_xmit+0x163f/0x35c0 net/core/dev.c:3982
dev_queue_xmit+0x18/0x20 net/core/dev.c:4046
packet_snd net/packet/af_packet.c:2966 [inline]
packet_sendmsg+0x260d/0x6220 net/packet/af_packet.c:2991
sock_sendmsg_nosec net/socket.c:639 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:659
sock_write_iter+0x2cb/0x400 net/socket.c:991
call_write_iter include/linux/fs.h:1902 [inline]
new_sync_write+0x4d3/0x770 fs/read_write.c:483
__vfs_write+0xe1/0x110 fs/read_write.c:496
vfs_write+0x268/0x5d0 fs/read_write.c:558
ksys_write+0x220/0x290 fs/read_write.c:611
__do_sys_write fs/read_write.c:623 [inline]
__se_sys_write fs/read_write.c:620 [inline]
__ia32_sys_write+0x71/0xb0 fs/read_write.c:620
do_syscall_32_irqs_on arch/x86/entry/common.c:337 [inline]
do_fast_syscall_32+0x27b/0xe16 arch/x86/entry/common.c:408
entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f42a39
Code: 00 00 00 89 d3 5b 5e 5f 5d c3 b8 80 96 98 00 eb c4 8b 04 24 c3 8b 1c 24 c3 8b 34 24 c3 8b 3c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5d3e0cc EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000300
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000