FAT-fs (loop0): codepage cp437 not found
INFO: task syz-executor.5:2104 blocked for more than 140 seconds.
Not tainted 4.9.171+ #49
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D24216 2104 1 0x00000004
ffff8801ce8f2f80 0000000000000000 ffff8801db721000 ffff8801ce67af80
ffff8801db721018 ffff8801b1dbfb28 ffffffff82801dde ffff8801ce8f2f80
ffff8801b1dbfc00 0000000000000046 ffff8801db7218f0 1ffff100363b7f54
Call Trace:
[<00000000b7e28646>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
[<00000000c4aebbc0>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
[<0000000020a115ff>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
[<0000000020a115ff>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
[<00000000972ece13>] __lo_release drivers/block/loop.c:1642 [inline]
[<00000000972ece13>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665
[<0000000025a01a09>] __blkdev_put+0x461/0x840 fs/block_dev.c:1606
[<00000000148f3c03>] blkdev_put+0x88/0x560 fs/block_dev.c:1671
[<000000004b97d6fc>] blkdev_close+0x8b/0xb0 fs/block_dev.c:1678
[<0000000027a27c56>] __fput+0x274/0x720 fs/file_table.c:208
[<00000000f4afa9f9>] ____fput+0x16/0x20 fs/file_table.c:244
[<000000005e81906c>] task_work_run+0x108/0x180 kernel/task_work.c:116
[<00000000ff295b1d>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
[<00000000ff295b1d>] exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:162
[<00000000b115c530>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
[<00000000b115c530>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline]
[<00000000b115c530>] do_syscall_64+0x3f7/0x570 arch/x86/entry/common.c:290
[<00000000ff1a644f>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Showing all locks held in the system:
2 locks held by khungtaskd/24:
#0: (rcu_read_lock){......}, at: [<000000007f12d194>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
#0: (rcu_read_lock){......}, at: [<000000007f12d194>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
#1: (tasklist_lock){.+.+..}, at: [<00000000011b2206>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
2 locks held by getty/2030:
#0: (&tty->ldisc_sem){++++++}, at: [<0000000098706c14>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<0000000096f7c0d4>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
3 locks held by syz-executor.5/2104:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000318affc5>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587
#1: (loop_index_mutex){+.+.+.}, at: [<0000000080b349cd>] lo_release+0x1e/0x1b0 drivers/block/loop.c:1664
#2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000972ece13>] __lo_release drivers/block/loop.c:1642 [inline]
#2: (loop_ctl_mutex#2){+.+.+.}, at: [<00000000972ece13>] lo_release+0x84/0x1b0 drivers/block/loop.c:1665
2 locks held by syz-executor.3/2114:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a2a958db>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000001f47752c>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by syz-executor.4/2119:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a2a958db>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000001f47752c>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by syz-executor.2/2124:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a2a958db>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
2 locks held by syz-executor.3/19592:
#0: (&tty->ldisc_sem){++++++}, at: [<0000000098706c14>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<0000000096f7c0d4>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.3/19830:
#0: (&tty->ldisc_sem){++++++}, at: [<0000000098706c14>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<0000000096f7c0d4>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.3/19857:
#0: (&tty->ldisc_sem){++++++}, at: [<0000000098706c14>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<0000000096f7c0d4>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.3/19999:
#0: (&tty->ldisc_sem){++++++}, at: [<0000000098706c14>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<0000000096f7c0d4>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.3/20041:
#0: (&tty->ldisc_sem){++++++}, at: [<0000000098706c14>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
#1: (&ldata->atomic_read_lock){+.+...}, at: [<0000000096f7c0d4>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.0/3070:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf23f13c>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629
1 lock held by syz-executor.0/3071:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf23f13c>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629
2 locks held by syz-executor.1/3073:
#0: (loop_ctl_mutex/1){+.+.+.}, at: [<00000000767b0882>] lo_ioctl+0x85/0x1a10 drivers/block/loop.c:1405
#1: (&bdev->bd_mutex){+.+.+.}, at: [<0000000071ba679e>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189
1 lock held by syz-executor.1/3084:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a2a958db>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
2 locks held by blkid/3076:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a2a958db>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000001f47752c>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by blkid/3080:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a2a958db>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000001f47752c>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
2 locks held by blkid/3081:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a2a958db>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
#1: (loop_index_mutex){+.+.+.}, at: [<000000001f47752c>] lo_open+0x1d/0xb0 drivers/block/loop.c:1622
1 lock held by blkid/3082:
#0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000a2a958db>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.171+ #49
ffff8801d98d7cc8 ffffffff81b4fb61 0000000000000000 0000000000000000
0000000000000000 ffffffff81097501 dffffc0000000000 ffff8801d98d7d00
ffffffff81b5adfc 0000000000000000 0000000000000000 0000000000000000
Call Trace:
[<000000009bc866ce>] __dump_stack lib/dump_stack.c:15 [inline]
[<000000009bc866ce>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<000000007087391d>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
[<000000001874f8d5>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
[<00000000df085b2b>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
[<00000000ad44aa32>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
[<00000000ad44aa32>] check_hung_task kernel/hung_task.c:126 [inline]
[<00000000ad44aa32>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
[<00000000ad44aa32>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
[<00000000d12d6bf5>] kthread+0x278/0x310 kernel/kthread.c:211
[<000000007034ca6e>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff82810e52