INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
1-....: (125000 ticks this GP) idle=f0e/140000000000001/0 softirq=136617/136617 fqs=31241
(detected by 0, t=125002 jiffies, g=73470, c=73469, q=465)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 21335 Comm: syz-executor2 Not tainted 4.15.0-rc4+ #137
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:ffff8801db506ff8 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000005 RDI: ffffffff87cdbb98
RBP: ffff8801db507008 R08: 1ffff1003b6a0d57 R09: 000000000000000c
R10: ffff8801db506f78 R11: 0000000000000040 R12: ffffffff87cdbb60
R13: 0000000000000020 R14: fffffbfff0f9b7b1 R15: fffffbfff0f9b775
FS: 0000000000000000(0000) GS:ffff8801db500000(0063) knlGS:00000000f77c8b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000020fea000 CR3: 00000001ae17d002 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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+0x647/0xa20 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.64+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+0x349/0xe10 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+0x9d/0xb0 arch/x86/entry/entry_64.S:795
RIP: 0010:__write_once_size include/linux/compiler.h:212 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x50 kernel/kcov.c:109
RSP: 0018:ffff8801bf4bf970 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11
RAX: 0000000000010000 RBX: ffffc900012ab060 RCX: ffffffff8286252c
RDX: 0000000000010000 RSI: ffffc900033d4000 RDI: ffffc900012ac260
RBP: ffff8801bf4bf970 R08: 1ffff10037e97e5f R09: 0000000000000004
R10: ffff8801bf4bf7c0 R11: 0000000000000003 R12: ffffc900012aa000
R13: 000000041b73c451 R14: 0000000020febffc R15: ffff8801c3b585f8
inq_canon drivers/tty/n_tty.c:2409 [inline]
n_tty_ioctl+0x20c/0x2d0 drivers/tty/n_tty.c:2429
tty_ioctl+0x32e/0x15f0 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+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7fccc79
RSP: 002b:00000000f77c808c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000015 RCX: 000000000000541b
RDX: 0000000020febffc RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 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 c8 f8 18 ff eb c2 e8 21 f9 18 ff eb
1-....: (125000 ticks this GP) idle=f0e/140000000000001/0 softirq=136617/136617 fqs=31416
(t=125708 jiffies g=73470 c=73469 q=465)
NMI backtrace for cpu 1
CPU: 1 PID: 21335 Comm: syz-executor2 Not tainted 4.15.0-rc4+ #137
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+0x186/0x1d5 kernel/rcu/tree.c:1459
print_cpu_stall kernel/rcu/tree.c:1608 [inline]
check_cpu_stall.isra.64+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+0x349/0xe10 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+0x9d/0xb0 arch/x86/entry/entry_64.S:795
RIP: 0010:__write_once_size include/linux/compiler.h:212 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4b/0x50 kernel/kcov.c:109
RSP: 0018:ffff8801bf4bf970 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11
RAX: 0000000000010000 RBX: ffffc900012ab060 RCX: ffffffff8286252c
RDX: 0000000000010000 RSI: ffffc900033d4000 RDI: ffffc900012ac260
RBP: ffff8801bf4bf970 R08: 1ffff10037e97e5f R09: 0000000000000004
R10: ffff8801bf4bf7c0 R11: 0000000000000003 R12: ffffc900012aa000
R13: 000000041b73c451 R14: 0000000020febffc R15: ffff8801c3b585f8
inq_canon drivers/tty/n_tty.c:2409 [inline]
n_tty_ioctl+0x20c/0x2d0 drivers/tty/n_tty.c:2429
tty_ioctl+0x32e/0x15f0 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+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7fccc79
RSP: 002b:00000000f77c808c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000015 RCX: 000000000000541b
RDX: 0000000020febffc 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: { 1-... } 128365 jiffies s: 5877 root: 0x2/.
blocking rcu_node structures:
Task dump for CPU 1:
syz-executor2 R running task 25120 21335 3382 0xa002000c
Call Trace:
context_switch kernel/sched/core.c:2802 [inline]
__schedule+0x8f3/0x2060 kernel/sched/core.c:3375