INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
0-....: (125000 ticks this GP) idle=e3e/140000000000001/0 softirq=85843/85843 fqs=31242
(detected by 1, t=125002 jiffies, g=48372, c=48371, q=876)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 24664 Comm: syz-executor7 Not tainted 4.15.0-rc1+ #198
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d3eb8300 task.stack: ffff8801d11c0000
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: 000000b015a57ec8 RBX: ffffffff87ced940 RCX: 000000b015a57df5
RDX: 00000000000000d3 RSI: 0000000000000000 RDI: 00000000000008fd
RBP: ffff8801db406ff0 R08: 0000000000000002 R09: 000000000000000c
R10: 0000000000000000 R11: ffffffff87489d60 R12: 0000000000002708
R13: 0000000000000020 R14: fffffbfff0f9db6f R15: fffffbfff0f9db32
FS: 00007f3aa7b79700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc83653ddb8 CR3: 00000001d7a81000 CR4: 00000000001426f0
DR0: 0000000020001000 DR1: 0000000020000000 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+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+0x1d4/0x5f0 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:__sanitizer_cov_trace_pc+0x3f/0x50 kernel/kcov.c:106
RSP: 0018:ffff8801d11c7a90 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff11
RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffffff838aee82
RDX: 0000000000010000 RSI: ffffc900021ca000 RDI: ffff8801cf6ca384
RBP: ffff8801d11c7a90 R08: ffffffff85f445c0 R09: 1ffff1003a238efd
R10: ffff8801d3eb8300 R11: 0000000000000001 R12: ffff8801cf6ca338
R13: ffff8801d06db6c0 R14: ffff8801dacb16c0 R15: ffff8801d06db818
loop_set_fd drivers/block/loop.c:882 [inline]
lo_ioctl+0x5a2/0x1b90 drivers/block/loop.c:1358
__blkdev_driver_ioctl block/ioctl.c:303 [inline]
blkdev_ioctl+0x1759/0x1e00 block/ioctl.c:601
block_ioctl+0xea/0x130 fs/block_dev.c:1860
vfs_ioctl fs/ioctl.c:46 [inline]
do_vfs_ioctl+0x1b1/0x1530 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: 0033:0x4529d9
RSP: 002b:00007f3aa7b78c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000000000015 RSI: 0000000000004c00 RDI: 0000000000000014
RBP: 000000000000005b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ed928
R13: 00000000ffffffff R14: 00007f3aa7b796d4 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 81 59 ed 7a f3 90 65 ff 05 78 59 ed 7a <65> 8b 15 d1 25 ed 7a 39 f2 74 ce 48 29 c1 89 d6 48 01 cf eb b5
0-....: (125000 ticks this GP) idle=e3e/140000000000001/0 softirq=85843/85843 fqs=31411
(t=125686 jiffies g=48372 c=48371 q=876)
NMI backtrace for cpu 0
CPU: 0 PID: 24664 Comm: syz-executor7 Not tainted 4.15.0-rc1+ #198
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+0x1d4/0x5f0 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:__sanitizer_cov_trace_pc+0x3f/0x50 kernel/kcov.c:106
RSP: 0018:ffff8801d11c7a90 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff11
RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffffff838aee82
RDX: 0000000000010000 RSI: ffffc900021ca000 RDI: ffff8801cf6ca384
RBP: ffff8801d11c7a90 R08: ffffffff85f445c0 R09: 1ffff1003a238efd
R10: ffff8801d3eb8300 R11: 0000000000000001 R12: ffff8801cf6ca338
R13: ffff8801d06db6c0 R14: ffff8801dacb16c0 R15: ffff8801d06db818
loop_set_fd drivers/block/loop.c:882 [inline]
lo_ioctl+0x5a2/0x1b90 drivers/block/loop.c:1358
__blkdev_driver_ioctl block/ioctl.c:303 [inline]
blkdev_ioctl+0x1759/0x1e00 block/ioctl.c:601
block_ioctl+0xea/0x130 fs/block_dev.c:1860
vfs_ioctl fs/ioctl.c:46 [inline]
do_vfs_ioctl+0x1b1/0x1530 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: 0033:0x4529d9
RSP: 002b:00007f3aa7b78c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 00000000004529d9
RDX: 0000000000000015 RSI: 0000000000004c00 RDI: 0000000000000014
RBP: 000000000000005b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ed928
R13: 00000000ffffffff R14: 00007f3aa7b796d4 R15: 0000000000000000