INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
0-....: (125000 ticks this GP) idle=8d6/140000000000001/0 softirq=93140/93140 fqs=31240
(detected by 1, t=125002 jiffies, g=51550, c=51549, q=741)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1135 Comm: syz-executor1 Not tainted 4.15.0-rc5+ #239
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:inb arch/x86/include/asm/io.h:348 [inline]
RIP: 0010:io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:434
RSP: 0018:ffff8801db406ff8 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff87debfb8
RBP: ffff8801db407008 R08: 1ffff1003b680d57 R09: 000000000000000c
R10: ffff8801db406f78 R11: 0000000000000040 R12: ffffffff87debf80
R13: 0000000000000020 R14: fffffbfff0fbd835 R15: fffffbfff0fbd7f9
FS: 00007f53d4352700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006efa88 CR3: 00000001c2832004 CR4: 00000000001606f0
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:111 [inline]
wait_for_xmitr+0x93/0x1e0 drivers/tty/serial/8250/8250_port.c:2033
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+0xd/0x50 kernel/kcov.c:94
RSP: 0018:ffff8801c037fb38 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11
RAX: ffff8801c1390040 RBX: ffffc90001262060 RCX: ffffffff8286ff0c
RDX: 0000000000010000 RSI: ffffc90002127000 RDI: ffffc90001263260
RBP: ffff8801c037fb38 R08: 1ffff1003806fe99 R09: 0000000000000004
R10: ffff8801c037f988 R11: 0000000000000003 R12: ffffc90001261000
R13: 0000000457d217d5 R14: 0000000020fef000 R15: ffff8801d021f638
inq_canon drivers/tty/n_tty.c:2412 [inline]
n_tty_ioctl+0x266/0x2d0 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
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f53d4351c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000020fef000 RSI: 000000000000541b RDI: 0000000000000014
RBP: 00000000000002ba R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f1210
R13: 00000000ffffffff R14: 00007f53d43526d4 R15: 0000000000000000
Code: 24 d1 00 00 00 49 8d 7c 24 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 17 41 03 5c 24 38 89 da ec <5b> 0f b6 c0 41 5c 5d c3 e8 b8 32 18 ff eb c2 e8 11 33 18 ff eb
0-....: (125000 ticks this GP) idle=8d6/140000000000001/0 softirq=93140/93140 fqs=31401
(t=125653 jiffies g=51550 c=51549 q=741)
NMI backtrace for cpu 0
CPU: 0 PID: 1135 Comm: syz-executor1 Not tainted 4.15.0-rc5+ #239
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+0xd/0x50 kernel/kcov.c:94
RSP: 0018:ffff8801c037fb38 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff11
RAX: ffff8801c1390040 RBX: ffffc90001262060 RCX: ffffffff8286ff0c
RDX: 0000000000010000 RSI: ffffc90002127000 RDI: ffffc90001263260
RBP: ffff8801c037fb38 R08: 1ffff1003806fe99 R09: 0000000000000004
R10: ffff8801c037f988 R11: 0000000000000003 R12: ffffc90001261000
R13: 0000000457d217d5 R14: 0000000020fef000 R15: ffff8801d021f638
inq_canon drivers/tty/n_tty.c:2412 [inline]
n_tty_ioctl+0x266/0x2d0 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
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452ac9
RSP: 002b:00007f53d4351c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000020fef000 RSI: 000000000000541b RDI: 0000000000000014
RBP: 00000000000002ba R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f1210
R13: 00000000ffffffff R14: 00007f53d43526d4 R15: 0000000000000000
INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-... } 128387 jiffies s: 6305 root: 0x1/.
blocking rcu_node structures:
Task dump for CPU 0:
syz-executor1 R running task 25432 1135 3388 0x8000000c
Call Trace:
context_switch kernel/sched/core.c:2802 [inline]
__schedule+0x8f3/0x2060 kernel/sched/core.c:3375