INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
0-....: (125000 ticks this GP) idle=fba/1/4611686018427387906 softirq=34118/34118 fqs=31221
(detected by 1, t=125002 jiffies, g=18273, c=18272, q=669)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10990 Comm: syz-executor2 Not tainted 4.15.0-rc1-mm1+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 00000000e3bd13c0 task.stack: 00000000818eef04
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: ffffffff87cf0a80
RBP: ffff8801db407008 R08: 0000000000000002 R09: 000000000000000c
R10: 0000000000000000 R11: ffffffff8748cda0 R12: ffffffff87cf0a40
R13: 0000000000000020 R14: fffffbfff0f9e18f R15: fffffbfff0f9e152
FS: 00007f37e64a0700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000006ef050 CR3: 00000001c39fb000 CR4: 00000000001426f0
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+0x788/0xd70 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:1656 [inline]
print_cpu_stall kernel/rcu/tree.c:1510 [inline]
check_cpu_stall.isra.64+0x845/0x15b0 kernel/rcu/tree.c:1592
__rcu_pending kernel/rcu/tree.c:3361 [inline]
rcu_pending kernel/rcu/tree.c:3423 [inline]
rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763
update_process_times+0x30/0x60 kernel/time/timer.c:1640
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:1348 [inline]
__hrtimer_run_queues+0x373/0xea0 kernel/time/hrtimer.c:1411
hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469
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:907
RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x50 kernel/kcov.c:106
RSP: 0018:ffff8801cca7fa90 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff11
RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffffff838b9fb2
RDX: 0000000000010000 RSI: ffffc9000362a000 RDI: ffff8801cf6e6a44
RBP: ffff8801cca7fa90 R08: ffffffff85f44cc0 R09: 1ffff1003994fefd
R10: ffff8801c851a400 R11: 0000000000000001 R12: ffff8801cf6e69f8
R13: ffff880192e3d6c0 R14: ffff8801cf6e1180 R15: ffff880192e3d818
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:00007f37e649fc58 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: 00007f37e64a06d4 R15: 0000000000000000
Code: 24 d9 00 00 00 49 8d 7c 24 40 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 40 89 da ec <5b> 0f b6 c0 41 5c 5d c3 e8 78 b1 18 ff eb c2 e8 d1 b1 18 ff eb
0-....: (125000 ticks this GP) idle=fba/1/4611686018427387906 softirq=34118/34118 fqs=31389
(t=125675 jiffies g=18273 c=18272 q=669)
NMI backtrace for cpu 0
CPU: 0 PID: 10990 Comm: syz-executor2 Not tainted 4.15.0-rc1-mm1+ #29
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+0x186/0x1da kernel/rcu/tree.c:1375
print_cpu_stall kernel/rcu/tree.c:1524 [inline]
check_cpu_stall.isra.64+0xbb8/0x15b0 kernel/rcu/tree.c:1592
__rcu_pending kernel/rcu/tree.c:3361 [inline]
rcu_pending kernel/rcu/tree.c:3423 [inline]
rcu_check_callbacks+0x238/0xd20 kernel/rcu/tree.c:2763
update_process_times+0x30/0x60 kernel/time/timer.c:1640
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:1348 [inline]
__hrtimer_run_queues+0x373/0xea0 kernel/time/hrtimer.c:1411
hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469
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:907
RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x50 kernel/kcov.c:106
RSP: 0018:ffff8801cca7fa90 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff11
RAX: 0000000000010000 RBX: dffffc0000000000 RCX: ffffffff838b9fb2
RDX: 0000000000010000 RSI: ffffc9000362a000 RDI: ffff8801cf6e6a44
RBP: ffff8801cca7fa90 R08: ffffffff85f44cc0 R09: 1ffff1003994fefd
R10: ffff8801c851a400 R11: 0000000000000001 R12: ffff8801cf6e69f8
R13: ffff880192e3d6c0 R14: ffff8801cf6e1180 R15: ffff880192e3d818
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:00007f37e649fc58 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: 00007f37e64a06d4 R15: 0000000000000000
INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 0-... } 127045 jiffies s: 1777 root: 0x1/.
blocking rcu_node structures:
Task dump for CPU 0:
syz-executor2 R running task 23048 10990 3328 0x8000000c
Call Trace:
context_switch kernel/sched/core.c:2803 [inline]
__schedule+0x8f3/0x2060 kernel/sched/core.c:3376