device syz2 entered promiscuous mode
device syz2 left promiscuous mode
INFO: task syz-executor4:15553 blocked for more than 120 seconds.
Not tainted 4.15.0+ #288
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4 D24560 15553 4204 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2845 [inline]
__schedule+0x8eb/0x2060 kernel/sched/core.c:3421
schedule+0xf5/0x430 kernel/sched/core.c:3480
blk_mq_freeze_queue_wait+0x1bb/0x400 block/blk-mq.c:136
blk_freeze_queue+0x4a/0x80 block/blk-mq.c:165
blk_mq_freeze_queue+0x15/0x20 block/blk-mq.c:174
loop_change_fd drivers/block/loop.c:667 [inline]
lo_ioctl+0x10ce/0x1b70 drivers/block/loop.c:1361
__blkdev_driver_ioctl block/ioctl.c:303 [inline]
blkdev_ioctl+0x1759/0x1e00 block/ioctl.c:601
block_ioctl+0xde/0x120 fs/block_dev.c:1860
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+0x29/0xa0
RIP: 0033:0x453299
RSP: 002b:00007f34d32b1c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299
RDX: 0000000000000017 RSI: 0000000000004c06 RDI: 0000000000000017
RBP: 00000000000001e9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f1e78
R13: 00000000ffffffff R14: 00007f34d32b26d4 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by khungtaskd/760:
#0: (rcu_read_lock){....}, at: [<000000002575f0f7>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<000000002575f0f7>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<000000006caad8af>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/4004:
#0: (&f->f_pos_lock){+.+.}, at: [<000000008e6b7024>] __fdget_pos+0x12b/0x190 fs/file.c:770
2 locks held by getty/4126:
#0: (&tty->ldisc_sem){++++}, at: [<00000000291a3a36>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c7bfe306>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4127:
#0: (&tty->ldisc_sem){++++}, at: [<00000000291a3a36>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c7bfe306>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4128:
#0: (&tty->ldisc_sem){++++}, at: [<00000000291a3a36>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c7bfe306>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4129:
#0: (&tty->ldisc_sem){++++}, at: [<00000000291a3a36>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c7bfe306>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4130:
#0: (&tty->ldisc_sem){++++}, at: [<00000000291a3a36>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c7bfe306>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4131:
#0: (&tty->ldisc_sem){++++}, at: [<00000000291a3a36>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c7bfe306>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4132:
#0: (&tty->ldisc_sem){++++}, at: [<00000000291a3a36>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c7bfe306>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
1 lock held by syz-executor4/15553:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<0000000098c699cc>] lo_ioctl+0x8b/0x1b70 drivers/block/loop.c:1355
1 lock held by syz-executor4/15570:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<0000000098c699cc>] lo_ioctl+0x8b/0x1b70 drivers/block/loop.c:1355
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 760 Comm: khungtaskd Not tainted 4.15.0+ #288
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_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:542
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54