rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10518 ticks this GP) idle=b96/1/0x4000000000000002 softirq=379615/379617 fqs=72
rcu: (t=10500 jiffies g=526833 q=11)
rcu: rcu_preempt kthread starved for 10356 jiffies! g526833 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt I28928 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2844 [inline]
__schedule+0x817/0x1cc0 kernel/sched/core.c:3485
schedule+0x92/0x180 kernel/sched/core.c:3529
schedule_timeout+0x4db/0xfd0 kernel/time/timer.c:1803
rcu_gp_fqs_loop kernel/rcu/tree.c:1948 [inline]
rcu_gp_kthread+0x956/0x17a0 kernel/rcu/tree.c:2105
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 22005 Comm: syz-executor.4 Not tainted 5.0.0-rc7+ #74
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+0x172/0x1f0 lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1be/0x236 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.c:1211
print_cpu_stall kernel/rcu/tree.c:1348 [inline]
check_cpu_stall kernel/rcu/tree.c:1422 [inline]
rcu_pending kernel/rcu/tree.c:3018 [inline]
rcu_check_callbacks.cold+0x500/0xa4a kernel/rcu/tree.c:2521
update_process_times+0x32/0x80 kernel/time/timer.c:1635
tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161
tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271
__run_hrtimer kernel/time/hrtimer.c:1389 [inline]
__hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
RIP: 0010:__x25_find_socket net/x25/af_x25.c:327 [inline]
RIP: 0010:x25_find_socket+0x4e/0x140 net/x25/af_x25.c:342
Code: 8b 25 c6 10 da 04 4d 85 e4 0f 84 c5 00 00 00 e8 68 dc 3b fb 49 83 ec 68 0f 84 b6 00 00 00 49 be 00 00 00 00 00 fc ff df eb 35 4d dc 3b fb 49 8d 7c 24 68 48 89 f8 48 c1 e8 03 42 80 3c 30 00
RSP: 0018:ffff888096147c58 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff86340886
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004
RBP: ffff888096147c80 R08: ffff8880a5658700 R09: fffffbfff1282bf1
R10: fffffbfff1282bf0 R11: ffffffff89415f83 R12: ffff88806b5435c0
R13: ffff8880a118ab40 R14: dffffc0000000000 R15: 0000000000000000
x25_new_lci net/x25/af_x25.c:355 [inline]
x25_connect+0x380/0xde0 net/x25/af_x25.c:784
__sys_connect+0x266/0x330 net/socket.c:1684
__do_sys_connect net/socket.c:1695 [inline]
__se_sys_connect net/socket.c:1692 [inline]
__x64_sys_connect+0x73/0xb0 net/socket.c:1692
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457e29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007efd84a2ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29
RDX: 0000000000000012 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 000000000073c0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007efd84a2b6d4
R13: 00000000004be362 R14: 00000000004ceb98 R15: 00000000ffffffff