INFO: task syz-executor.3:13071 can't die for more than 143 seconds. syz-executor.3 D28400 13071 7077 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 kthread_stop+0x17a/0x7f0 kernel/kthread.c:572 ubi_detach_mtd_dev+0x211/0x432 drivers/mtd/ubi/build.c:1101 ctrl_cdev_ioctl+0x1bf/0x2b0 drivers/mtd/ubi/cdev.c:1068 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f5c23b41c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f5c23b426d4 INFO: task syz-executor.3:13071 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28400 13071 7077 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 kthread_stop+0x17a/0x7f0 kernel/kthread.c:572 ubi_detach_mtd_dev+0x211/0x432 drivers/mtd/ubi/build.c:1101 ctrl_cdev_ioctl+0x1bf/0x2b0 drivers/mtd/ubi/cdev.c:1068 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f5c23b41c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f5c23b426d4 INFO: task syz-executor.1:13069 can't die for more than 143 seconds. syz-executor.1 D28400 13069 7085 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f3fcc5b2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f3fcc5b36d4 INFO: task syz-executor.1:13069 blocked for more than 144 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28400 13069 7085 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: Bad RIP value. RSP: 002b:00007f3fcc5b2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f3fcc5b36d4 INFO: task syz-executor.5:13080 can't die for more than 144 seconds. syz-executor.5 D28400 13080 7076 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f46d25ccc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f46d25cd6d4 INFO: task syz-executor.5:13080 blocked for more than 144 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28400 13080 7076 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f46d25ccc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f46d25cd6d4 INFO: task syz-executor.0:13082 can't die for more than 144 seconds. syz-executor.0 D28400 13082 7079 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007fdf71c6fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007fdf71c706d4 INFO: task syz-executor.0:13082 blocked for more than 144 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28400 13082 7079 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007fdf71c6fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007fdf71c706d4 INFO: task syz-executor.4:13091 can't die for more than 145 seconds. syz-executor.4 D28400 13091 7081 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f8b6832bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f8b6832c6d4 INFO: task syz-executor.4:13091 blocked for more than 145 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28400 13091 7081 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f8b6832bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f8b6832c6d4 INFO: task syz-executor.2:13100 can't die for more than 145 seconds. syz-executor.2 D28400 13100 7073 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f3016afbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f3016afc6d4 INFO: task syz-executor.2:13100 blocked for more than 145 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28400 13100 7073 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f3016afbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f3016afc6d4 INFO: task syz-executor.2:13103 can't die for more than 145 seconds. syz-executor.2 D28400 13103 7073 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x214/0x2b0 drivers/mtd/ubi/cdev.c:1042 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f3016adac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f3016adb6d4 INFO: task syz-executor.2:13103 blocked for more than 146 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28400 13103 7073 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x214/0x2b0 drivers/mtd/ubi/cdev.c:1042 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f3016adac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040186f40 RDI: 0000000000000004 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f3016adb6d4 INFO: task syz-executor.2:13109 can't die for more than 146 seconds. syz-executor.2 D28400 13109 7073 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f3016ab9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f3016aba6d4 INFO: task syz-executor.2:13109 blocked for more than 146 seconds. Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28400 13109 7073 0x00000004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4222 __mutex_lock_common kernel/locking/mutex.c:1033 [inline] __mutex_lock+0x7ab/0x13c0 kernel/locking/mutex.c:1103 ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:763 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca29 Code: 48 20 0f 94 c0 88 44 24 40 48 8b 6c 24 20 48 83 c4 28 c3 31 c0 eb ee 48 89 34 24 48 89 4c 24 08 48 89 54 24 10 e8 17 5a fa ff <0f> b6 4c 24 18 48 8b 44 24 30 48 8b 5c 24 38 eb bb 31 c9 eb b7 48 RSP: 002b:00007f3016ab9c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1080 RCX: 000000000045ca29 RDX: 000000000076006e RSI: 0000000040046f41 RDI: 0000000000000003 RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000209 R14: 00000000004c44c1 R15: 00007f3016aba6d4 Showing all locks held in the system: 1 lock held by khungtaskd/1163: #0: ffffffff899befc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 1 lock held by syz-executor.3/13071: #0: ffffffff8a15c988 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.1/13069: #0: ffffffff8a15c988 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.5/13080: #0: ffffffff8a15c988 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.0/13082: #0: ffffffff8a15c988 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.4/13091: #0: ffffffff8a15c988 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.2/13100: #0: ffffffff8a15c988 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 1 lock held by syz-executor.2/13103: #0: ffffffff8a15c988 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x214/0x2b0 drivers/mtd/ubi/cdev.c:1042 1 lock held by syz-executor.2/13109: #0: ffffffff8a15c988 (ubi_devices_mutex){+.+.}-{3:3}, at: ctrl_cdev_ioctl+0x1b5/0x2b0 drivers/mtd/ubi/cdev.c:1067 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1163 Comm: khungtaskd Not tainted 5.7.0-rc1-next-20200415-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xde3/0x14e0 kernel/hung_task.c:333 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60