ubi0: max/mean erase counter: 1/1, WL threshold: 4096, image sequence number: 3168473204 ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 ubi0: background thread "ubi_bgt0d" started, PID 4072 ubi0: detaching mtd0 INFO: task syz-executor.5:4061 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28896 4061 6359 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f00ac1efc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000006 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f00ac1f06d4 INFO: task syz-executor.4:4067 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28800 4067 6358 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f2dbbf91c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000007 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f2dbbf926d4 INFO: task syz-executor.4:4080 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D30080 4080 6358 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f2dbbf70c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000006 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f2dbbf716d4 INFO: task syz-executor.4:4081 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D30080 4081 6358 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f2dbbf4fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000006 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f2dbbf506d4 INFO: task syz-executor.4:4094 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29216 4094 6358 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f2dbbf2ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000007 RBP: 000000000078c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f2dbbf2f6d4 INFO: task syz-executor.3:4063 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28832 4063 6357 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f275792cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000009 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f275792d6d4 INFO: task syz-executor.3:4070 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D30080 4070 6357 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f275790bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f275790c6d4 INFO: task syz-executor.3:4079 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28576 4079 6357 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f27578eac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000008 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f27578eb6d4 INFO: task syz-executor.3:4083 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D30080 4083 6357 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f27578c9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000003 RBP: 000000000078c0e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f27578ca6d4 INFO: task syz-executor.3:4087 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D30096 4087 6357 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x5f0/0x1430 kernel/locking/mutex.c:893 ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45cba9 RSP: 002b:00007f27578a8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e2240 RCX: 000000000045cba9 RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004 RBP: 000000000078c180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000215 R14: 00000000004c472a R15: 00007f27578a96d4 Showing all locks held in the system: 1 lock held by khungtaskd/1058: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor.5/4061: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.4/4067: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.4/4080: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.4/4081: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.4/4094: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.3/4063: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.3/4070: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.3/4079: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.3/4083: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.3/4087: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.3/4089: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.1/4066: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.1/4078: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.1/4084: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.1/4085: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 1 lock held by syz-executor.1/4086: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.2/4064: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.2/4075: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.0/4065: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x142/0x220 drivers/mtd/ubi/cdev.c:1039 1 lock held by syz-executor.0/4068: #0: (ubi_devices_mutex){+.+.}, at: [] ctrl_cdev_ioctl+0x190/0x220 drivers/mtd/ubi/cdev.c:1014 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1058 Comm: khungtaskd Not tainted 4.14.184-syzkaller #0 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+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e2/0xb80 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff863e461e