rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: (detected by 0, t=10502 jiffies, g=24677, q=76)
rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294971080-4294960579), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.0 R running task 27248 15381 8133 0x00000000
Call Trace:
sched_show_task.cold+0x332/0x396 kernel/sched/core.c:5337
print_other_cpu_stall kernel/rcu/tree.c:1430 [inline]
check_cpu_stall kernel/rcu/tree.c:1557 [inline]
__rcu_pending kernel/rcu/tree.c:3293 [inline]
rcu_pending kernel/rcu/tree.c:3336 [inline]
rcu_check_callbacks.cold+0xb37/0xe19 kernel/rcu/tree.c:2682
update_process_times+0x2a/0x70 kernel/time/timer.c:1650
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
__run_hrtimer kernel/time/hrtimer.c:1465 [inline]
__hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527
hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline]
smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:tty_open+0x5ae/0x990 drivers/tty/tty_io.c:2034
Code: 00 0f 85 c3 03 00 00 49 8b bc 24 90 01 00 00 41 89 ed 49 c7 84 24 90 01 00 00 00 00 00 00 e8 09 3d df fd 89 ee bf f5 ff ff ff cd 8f a9 fd 83 fd f5 0f 85 6f ff ff ff e8 4f 8e a9 fd 65 48 8b
RSP: 0018:ffff88809577f910 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00000000fffffff5 RDI: 00000000fffffff5
RBP: fffffffffffffff5 R08: 0000000000400000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ab7f5a40
R13: 00000000fffffff5 R14: fffffffffffffff5 R15: 0000000000400043
chrdev_open+0x266/0x770 fs/char_dev.c:423
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f9439e49049
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f94387be168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9439f5bf60 RCX: 00007f9439e49049
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007f9439ea308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc13fd1eaf R14: 00007f94387be300 R15: 0000000000022000
rcu: rcu_preempt kthread starved for 10533 jiffies! g24677 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 29208 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1818
rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
----------------
Code disassembly (best guess):
0: 00 0f add %cl,(%rdi)
2: 85 c3 test %eax,%ebx
4: 03 00 add (%rax),%eax
6: 00 49 8b add %cl,-0x75(%rcx)
9: bc 24 90 01 00 mov $0x19024,%esp
e: 00 41 89 add %al,-0x77(%rcx)
11: ed in (%dx),%eax
12: 49 c7 84 24 90 01 00 movq $0x0,0x190(%r12)
19: 00 00 00 00 00
1e: e8 09 3d df fd callq 0xfddf3d2c
23: 89 ee mov %ebp,%esi
25: bf f5 ff ff ff mov $0xfffffff5,%edi
* 2a: e8 cd 8f a9 fd callq 0xfda98ffc <-- trapping instruction
2f: 83 fd f5 cmp $0xfffffff5,%ebp
32: 0f 85 6f ff ff ff jne 0xffffffa7
38: e8 4f 8e a9 fd callq 0xfda98e8c
3d: 65 gs
3e: 48 rex.W
3f: 8b .byte 0x8b