generic_make_request: Trying to write to read-only block-device unknown-block(7,0) (partno 0)
INFO: task syz-executor7:17809 blocked for more than 120 seconds.
Not tainted 4.15.0+ #293
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7 D24400 17809 4071 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_update_dio+0x4b1/0x640 drivers/block/loop.c:214
loop_set_dio drivers/block/loop.c:1321 [inline]
lo_ioctl+0x14b7/0x1b70 drivers/block/loop.c:1395
__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:00007f005df99c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000453299
RDX: 00000000000003ff RSI: 0000000000004c08 RDI: 0000000000000015
RBP: 0000000000000622 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f83d0
R13: 00000000ffffffff R14: 00007f005df9a6d4 R15: 0000000000000005
Showing all locks held in the system:
2 locks held by khungtaskd/755:
#0: (rcu_read_lock){....}, at: [<0000000059655979>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<0000000059655979>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000b29c7b53>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/3873:
#0: (&f->f_pos_lock){+.+.}, at: [<00000000947ca86c>] __fdget_pos+0x12b/0x190 fs/file.c:765
2 locks held by getty/3995:
#0: (&tty->ldisc_sem){++++}, at: [<000000008a3b1e51>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005082ac10>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3996:
#0: (&tty->ldisc_sem){++++}, at: [<000000008a3b1e51>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005082ac10>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3997:
#0: (&tty->ldisc_sem){++++}, at: [<000000008a3b1e51>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005082ac10>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3998:
#0: (&tty->ldisc_sem){++++}, at: [<000000008a3b1e51>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005082ac10>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3999:
#0: (&tty->ldisc_sem){++++}, at: [<000000008a3b1e51>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005082ac10>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4000:
#0: (&tty->ldisc_sem){++++}, at: [<000000008a3b1e51>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005082ac10>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/4001:
#0: (&tty->ldisc_sem){++++}, at: [<000000008a3b1e51>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005082ac10>] n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
1 lock held by syz-executor7/17809:
#0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<00000000e58c5ba6>] lo_ioctl+0x8b/0x1b70 drivers/block/loop.c:1355
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 755 Comm: khungtaskd Not tainted 4.15.0+ #293
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0+ #293
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0xa1a/0x3e00 kernel/locking/lockdep.c:3310
RSP: 0018:ffff8801db507750 EFLAGS: 00000006
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000002
RDX: 1ffffffff1029629 RSI: 0000000000000000 RDI: ffffffff86ac93e0
RBP: ffff8801db507ae0 R08: ffffffff81645d2e R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff8814b148 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000002 R15: ffff8801d9f10300
FS: 0000000000000000(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd4c2e31000 CR3: 0000000006a22003 CR4: 00000000001606e0
Call Trace:
<IRQ>
lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920
seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline]
read_seqcount_begin include/linux/seqlock.h:164 [inline]
ktime_get+0x12f/0x3a0 kernel/time/timekeeping.c:762
tick_nohz_irq_enter kernel/time/tick-sched.c:1148 [inline]
tick_irq_enter+0x9e/0x390 kernel/time/tick-sched.c:1169
irq_enter+0xb6/0xd0 kernel/softirq.c:346
scheduler_ipi+0x23d/0x820 kernel/sched/core.c:1794
smp_reschedule_interrupt+0xe6/0x670 arch/x86/kernel/smp.c:277
reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:962
</IRQ>
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffff8801d9f1fcb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02
RAX: dffffc0000000000 RBX: 1ffff1003b3e3f99 RCX: 0000000000000000
RDX: 1ffffffff0d59280 RSI: 0000000000000001 RDI: ffffffff86ac9400
RBP: ffff8801d9f1fcb0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8801d9f1fd68 R14: ffffffff87268d20 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline]
default_idle+0xbf/0x430 arch/x86/kernel/process.c:354
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345
default_idle_call+0x36/0x90 kernel/sched/idle.c:98
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:351
start_secondary+0x40a/0x590 arch/x86/kernel/smpboot.c:267
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237
Code: 5e 41 5f 5d 49 8d 62 f8 c3 4c 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 0a 33 00 00 49 81 3b 20 4d 57 87 <41> bd 00 00 00 00 44 0f 45 eb 83 fe 01 0f 87 85 f7 ff ff 89 f3