INFO: task syz-executor.0:1847 blocked for more than 140 seconds. Not tainted 4.14.113+ #61 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D24576 1847 1 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 blkdev_reread_part+0x1b/0x40 block/ioctl.c:192 loop_reread_partitions+0x72/0x80 drivers/block/loop.c:615 loop_clr_fd+0x828/0xac0 drivers/block/loop.c:1069 lo_ioctl+0x813/0x1970 drivers/block/loop.c:1415 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x4d9/0x1810 block/ioctl.c:594 block_ioctl+0xd9/0x120 fs/block_dev.c:1881 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 INFO: task syz-executor.5:1851 blocked for more than 140 seconds. Not tainted 4.14.113+ #61 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D25640 1851 1 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 __lo_release drivers/block/loop.c:1644 [inline] lo_release+0x78/0x190 drivers/block/loop.c:1668 __blkdev_put+0x518/0x6d0 fs/block_dev.c:1791 blkdev_close+0x86/0xb0 fs/block_dev.c:1863 __fput+0x25e/0x700 fs/file_table.c:210 task_work_run+0x118/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x13b/0x160 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:267 [inline] do_syscall_64+0x372/0x4b0 arch/x86/entry/common.c:294 INFO: task syz-executor.4:1855 blocked for more than 140 seconds. Not tainted 4.14.113+ #61 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D25640 1855 1 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 lo_open+0x19/0xb0 drivers/block/loop.c:1624 __blkdev_get+0x267/0xf90 fs/block_dev.c:1472 blkdev_get+0x97/0x8b0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 do_dentry_open+0x44e/0xdf0 fs/open.c:770 vfs_open+0x105/0x230 fs/open.c:884 do_last fs/namei.c:3455 [inline] path_openat+0xb6b/0x2b70 fs/namei.c:3597 do_filp_open+0x1a1/0x280 fs/namei.c:3631 do_sys_open+0x2ca/0x590 fs/open.c:1077 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 INFO: task blkid:19402 blocked for more than 140 seconds. Not tainted 4.14.113+ #61 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D28448 19402 10716 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 blkdev_get+0x97/0x8b0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 do_dentry_open+0x44e/0xdf0 fs/open.c:770 vfs_open+0x105/0x230 fs/open.c:884 do_last fs/namei.c:3455 [inline] path_openat+0xb6b/0x2b70 fs/namei.c:3597 do_filp_open+0x1a1/0x280 fs/namei.c:3631 do_sys_open+0x2ca/0x590 fs/open.c:1077 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 INFO: task blkid:19403 blocked for more than 140 seconds. Not tainted 4.14.113+ #61 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D29000 19403 11600 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893 lo_open+0x19/0xb0 drivers/block/loop.c:1624 __blkdev_get+0x963/0xf90 fs/block_dev.c:1537 blkdev_get+0x97/0x8b0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 do_dentry_open+0x44e/0xdf0 fs/open.c:770 vfs_open+0x105/0x230 fs/open.c:884 do_last fs/namei.c:3455 [inline] path_openat+0xb6b/0x2b70 fs/namei.c:3597 do_filp_open+0x1a1/0x280 fs/namei.c:3631 do_sys_open+0x2ca/0x590 fs/open.c:1077 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [<00000000464fb976>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 2 locks held by getty/1757: #0: (&tty->ldisc_sem){++++}, at: [<0000000076efd19c>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000038a8b635>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.0/1847: #0: (loop_ctl_mutex/1){+.+.}, at: [<000000005618b2c4>] lo_ioctl+0x83/0x1970 drivers/block/loop.c:1405 #1: (&bdev->bd_mutex){+.+.}, at: [<0000000050230faf>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192 3 locks held by syz-executor.5/1851: #0: (&bdev->bd_mutex){+.+.}, at: [<0000000022cc369b>] __blkdev_put+0xb1/0x6d0 fs/block_dev.c:1778 #1: (loop_index_mutex){+.+.}, at: [<00000000f60e347f>] lo_release+0x19/0x190 drivers/block/loop.c:1667 #2: (loop_ctl_mutex#2){+.+.}, at: [<000000006f6c4102>] __lo_release drivers/block/loop.c:1644 [inline] #2: (loop_ctl_mutex#2){+.+.}, at: [<000000006f6c4102>] lo_release+0x78/0x190 drivers/block/loop.c:1668 2 locks held by syz-executor.4/1855: #0: (&bdev->bd_mutex){+.+.}, at: [<000000000b2b6f9e>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 #1: (loop_index_mutex){+.+.}, at: [<000000001e5a7ece>] lo_open+0x19/0xb0 drivers/block/loop.c:1624 1 lock held by blkid/19402: #0: (&bdev->bd_mutex){+.+.}, at: [<000000000b2b6f9e>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 2 locks held by blkid/19403: #0: (&bdev->bd_mutex){+.+.}, at: [<000000000b2b6f9e>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 #1: (loop_index_mutex){+.+.}, at: [<000000001e5a7ece>] lo_open+0x19/0xb0 drivers/block/loop.c:1624 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.113+ #61 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7338 Comm: syz-executor.3 Not tainted 4.14.113+ #61 task: 00000000d3f733bc task.stack: 00000000250ef8ab RIP: 0010:__lock_acquire+0x322/0x3fa0 kernel/locking/lockdep.c:3431 RSP: 0000:ffff8881a13df970 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: ffff8881a13d0848 RSI: 0000000000000237 RDI: ffff8881a13d0840 RBP: ffff8881a13dfb28 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8881a13d0830 R11: 0000000000000000 R12: ffff8881a13d0848 R13: 0000000000000237 R14: 0000000000000000 R15: ffff8881a13d0000 FS: 00007f30fc7e2700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000058ace7c01c65 CR3: 00000001c4f50004 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x10f/0x380 kernel/locking/lockdep.c:3994 __might_fault mm/memory.c:4578 [inline] __might_fault+0x137/0x1b0 mm/memory.c:4563 __copy_to_user include/linux/uaccess.h:102 [inline] save_xstate_epilog arch/x86/kernel/fpu/signal.c:89 [inline] copy_fpstate_to_sigframe+0x2d2/0x6a0 arch/x86/kernel/fpu/signal.c:203 get_sigframe arch/x86/kernel/signal.c:284 [inline] __setup_rt_frame arch/x86/kernel/signal.c:465 [inline] setup_rt_frame arch/x86/kernel/signal.c:699 [inline] handle_signal arch/x86/kernel/signal.c:743 [inline] do_signal+0xefb/0x15c0 arch/x86/kernel/signal.c:811 exit_to_usermode_loop+0x11d/0x160 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x128/0x160 arch/x86/entry/common.c:198 retint_user+0x8/0x18 RIP: 0033:0x58ace7c01c65 RSP: 002b:00007f30fc7e1be0 EFLAGS: 00010287 RAX: 0000000000000001 RBX: 0000000000000009 RCX: 0000000000421310 RDX: 000058ace7c01c65 RSI: 0000000000000001 RDI: 00007f30fc7e2608 RBP: 000000000000000a R08: 00007f30fc7e1be0 R09: 000000000000000a R10: 0000000000000008 R11: 0000000000000246 R12: 000000000000000b R13: 000000000000000c R14: 000000000000000d R15: 00000000ffffffff Code: 42 08 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 0f 85 53 28 00 00 48 b8 00 00 00 00 00 fc ff df 4d 89 62 10 4d 8d 62 18 4c 89 e2 <48> c1 ea 03 80 3c 02 00 0f 85 6e 28 00 00 48 8b 84 24 88 00 00