INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
0-....: (125000 ticks this GP) idle=bb6/140000000000001/0 softirq=28393/28393 fqs=31241
(detected by 1, t=125002 jiffies, g=15433, c=15432, q=512)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12174 Comm: syz-executor2 Not tainted 4.15.0-rc5+ #149
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:76 [inline]
RIP: 0010:delay_tsc+0x48/0x70 arch/x86/lib/delay.c:68
RSP: 0018:ffff8801db406ff0 EFLAGS: 00000003
RAX: 00000066820fb171 RBX: ffffffff87debf80 RCX: 00000066820fad38
RDX: 0000000000000439 RSI: 0000000000000000 RDI: 00000000000008fd
RBP: ffff8801db406ff0 R08: 1ffff1003b680d57 R09: 000000000000000c
R10: ffff8801db406f78 R11: 0000000000000040 R12: 000000000000270d
R13: 0000000000000020 R14: fffffbfff0fbd835 R15: fffffbfff0fbd7f9
FS: 0000000000000000(0000) GS:ffff8801db400000(0063) knlGS:00000000f77abb40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020ff0000 CR3: 00000001d6a6b002 CR4: 00000000001606f0
DR0: 0000000020001000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
__delay arch/x86/lib/delay.c:161 [inline]
__const_udelay+0x5b/0x70 arch/x86/lib/delay.c:175
wait_for_xmitr+0x6f/0x1e0 drivers/tty/serial/8250/8250_port.c:2041
serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3170
uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1858
serial8250_console_write+0x64f/0xa40 drivers/tty/serial/8250/8250_port.c:3236
univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590
call_console_drivers kernel/printk/printk.c:1574 [inline]
console_unlock+0x788/0xd80 kernel/printk/printk.c:2233
vprintk_emit+0x4ad/0x590 kernel/printk/printk.c:1757
vprintk_default+0x28/0x30 kernel/printk/printk.c:1796
vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379
printk+0xaa/0xca kernel/printk/printk.c:1829
print_cpu_stall_info_begin kernel/rcu/tree_plugin.h:1657 [inline]
print_cpu_stall kernel/rcu/tree.c:1594 [inline]
check_cpu_stall.isra.61+0x845/0x15b0 kernel/rcu/tree.c:1676
__rcu_pending kernel/rcu/tree.c:3440 [inline]
rcu_pending kernel/rcu/tree.c:3502 [inline]
rcu_check_callbacks+0x256/0xd00 kernel/rcu/tree.c:2842
update_process_times+0x30/0x60 kernel/time/timer.c:1630
tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162
tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1166
__run_hrtimer kernel/time/hrtimer.c:1211 [inline]
__hrtimer_run_queues+0x358/0xe20 kernel/time/hrtimer.c:1275
hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1309
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050
apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:904
RIP: 0010:__sanitizer_cov_trace_pc+0x38/0x50 kernel/kcov.c:107
RSP: 0018:ffff8801bef5f970 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11
RAX: 0000000000010000 RBX: ffffc90001257060 RCX: ffffffff8286ff0c
RDX: 0000000000000002 RSI: ffffc900029b8000 RDI: ffffc90001258260
RBP: ffff8801bef5f970 R08: 1ffff10037debe5f R09: 0000000000000004
R10: ffff8801bef5f7c0 R11: 0000000000000003 R12: ffffc90001256000
R13: 000000045829d54a R14: 00000000201e2ffc R15: ffff8801d0353378
inq_canon drivers/tty/n_tty.c:2409 [inline]
n_tty_ioctl+0x20c/0x2d0 drivers/tty/n_tty.c:2429
tty_ioctl+0x336/0x1610 drivers/tty/tty_io.c:2638
vfs_ioctl fs/ioctl.c:46 [inline]
do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
C_SYSC_ioctl fs/compat_ioctl.c:1495 [inline]
compat_SyS_ioctl+0x4ef/0x2a30 fs/compat_ioctl.c:1419
do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7fd0c79
RSP: 002b:00000000f77ab08c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 000000000000541b
RDX: 00000000201e2ffc RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Code: d1 48 09 c1 0f ae e8 0f 31 48 c1 e2 20 48 09 d0 48 89 c2 48 29 ca 48 39 fa 73 25 65 ff 0d 31 d3 eb 7a f3 90 65 ff 05 28 d3 eb 7a <65> 8b 15 01 a0 eb 7a 39 f2 74 ce 48 29 c1 89 d6 48 01 cf eb b5
0-....: (125000 ticks this GP) idle=bb6/140000000000001/0 softirq=28393/28393 fqs=31421
(t=125728 jiffies g=15433 c=15432 q=512)
NMI backtrace for cpu 0
CPU: 0 PID: 12174 Comm: syz-executor2 Not tainted 4.15.0-rc5+ #149
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x122/0x180 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:156 [inline]
rcu_dump_cpu_stacks+0x186/0x1d9 kernel/rcu/tree.c:1459
print_cpu_stall kernel/rcu/tree.c:1608 [inline]
check_cpu_stall.isra.61+0xbb8/0x15b0 kernel/rcu/tree.c:1676
__rcu_pending kernel/rcu/tree.c:3440 [inline]
rcu_pending kernel/rcu/tree.c:3502 [inline]
rcu_check_callbacks+0x256/0xd00 kernel/rcu/tree.c:2842
update_process_times+0x30/0x60 kernel/time/timer.c:1630
tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162
tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1166
__run_hrtimer kernel/time/hrtimer.c:1211 [inline]
__hrtimer_run_queues+0x358/0xe20 kernel/time/hrtimer.c:1275
hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1309
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050
apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:904
RIP: 0010:__sanitizer_cov_trace_pc+0x38/0x50 kernel/kcov.c:107
RSP: 0018:ffff8801bef5f970 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11
RAX: 0000000000010000 RBX: ffffc90001257060 RCX: ffffffff8286ff0c
RDX: 0000000000000002 RSI: ffffc900029b8000 RDI: ffffc90001258260
RBP: ffff8801bef5f970 R08: 1ffff10037debe5f R09: 0000000000000004
R10: ffff8801bef5f7c0 R11: 0000000000000003 R12: ffffc90001256000
R13: 000000045829d54a R14: 00000000201e2ffc R15: ffff8801d0353378
inq_canon drivers/tty/n_tty.c:2409 [inline]
n_tty_ioctl+0x20c/0x2d0 drivers/tty/n_tty.c:2429
tty_ioctl+0x336/0x1610 drivers/tty/tty_io.c:2638
vfs_ioctl fs/ioctl.c:46 [inline]
do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
C_SYSC_ioctl fs/compat_ioctl.c:1495 [inline]
compat_SyS_ioctl+0x4ef/0x2a30 fs/compat_ioctl.c:1419
do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
entry_SYSENTER_compat+0x54/0x63 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7fd0c79
RSP: 002b:00000000f77ab08c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 000000000000541b
RDX: 00000000201e2ffc RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-... } 126636 jiffies s: 1817 root: 0x1/.
blocking rcu_node structures:
Task dump for CPU 0:
syz-executor2 R running task 23312 12174 3373 0xa002000c
Call Trace:
context_switch kernel/sched/core.c:2802 [inline]
__schedule+0x8f3/0x2060 kernel/sched/core.c:3375