INFO: task systemd-udevd:4626 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. systemd-udevd D25872 4626 1 0x00000104 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 lo_release+0x1b/0x190 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1677 __blkdev_put+0x5aa/0x800 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1803 blkdev_close+0x86/0xb0 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1875 __fput+0x25f/0x7a0 syzkaller/managers/linux-4-14/kernel/fs/file_table.c:210 task_work_run+0x11f/0x190 syzkaller/managers/linux-4-14/kernel/kernel/task_work.c:113 tracehook_notify_resume syzkaller/managers/linux-4-14/kernel/./include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:164 prepare_exit_to_usermode syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:199 [inline] syscall_return_slowpath syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f7ee2c44270 RSP: 002b:00007ffde5dbb8b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007ffde5dbb980 RCX: 00007f7ee2c44270 RDX: 0000000000000000 RSI: 000000000000125f RDI: 000000000000000e RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffde5dbba60 R13: 00005636fd0e6010 R14: 00005636fd315c40 R15: 00007ffde5dbb930 INFO: task syz-executor.4:7993 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D25632 7993 1 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 blkdev_get+0x88/0x890 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 syzkaller/managers/linux-4-14/kernel/fs/open.c:777 vfs_open+0x105/0x220 syzkaller/managers/linux-4-14/kernel/fs/open.c:888 do_last syzkaller/managers/linux-4-14/kernel/fs/namei.c:3428 [inline] path_openat+0x628/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3569 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4190f4 RSP: 002b:00007ffc6d64c1f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007ffc6d64c300 RCX: 00000000004190f4 RDX: 0000000000000002 RSI: 00007ffc6d64c340 RDI: 00000000ffffff9c RBP: 00007ffc6d64c340 R08: 0000000000000000 R09: 00007ffc6d64c100 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00000000000704de R14: 0000000000000000 R15: 00007ffc6d64c340 INFO: task syz-executor.5:4764 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27544 4764 7990 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 lo_release+0x1b/0x190 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1677 __blkdev_put+0x5aa/0x800 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1803 blkdev_close+0x86/0xb0 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1875 __fput+0x25f/0x7a0 syzkaller/managers/linux-4-14/kernel/fs/file_table.c:210 task_work_run+0x11f/0x190 syzkaller/managers/linux-4-14/kernel/kernel/task_work.c:113 tracehook_notify_resume syzkaller/managers/linux-4-14/kernel/./include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:164 prepare_exit_to_usermode syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:199 [inline] syscall_return_slowpath syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x418e1b RSP: 002b:00007f7f0df2dee0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 00007f7f0df2df40 RCX: 0000000000418e1b RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000005 RBP: 00007f7f0df2e6bc R08: 0000000000000000 R09: 00007f7f0df2dd90 R10: 00007f7f0df2dc47 R11: 0000000000000293 R12: 0000000000000008 R13: 0000000000000000 R14: 0000000000000000 R15: 00007f7f0df2df80 INFO: task syz-executor.1:4771 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27544 4771 7994 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 blkdev_reread_part+0x1b/0x40 syzkaller/managers/linux-4-14/kernel/block/ioctl.c:192 loop_reread_partitions syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:624 [inline] loop_set_status+0xeeb/0x12b0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1193 loop_set_status64+0x92/0xe0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1311 lo_ioctl+0x587/0x1cd0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1441 __blkdev_driver_ioctl syzkaller/managers/linux-4-14/kernel/block/ioctl.c:297 [inline] blkdev_ioctl+0x540/0x1830 syzkaller/managers/linux-4-14/kernel/block/ioctl.c:594 block_ioctl+0xd9/0x120 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1893 vfs_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:46 [inline] file_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:684 SYSC_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4658c7 RSP: 002b:00007fb668eabef8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb668eabf40 RCX: 00000000004658c7 RDX: 00007fb668eac050 RSI: 0000000000004c04 RDI: 0000000000000005 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fb668eac050 R13: 00007fffa8ef620f R14: 00007fb668eac300 R15: 0000000000022000 INFO: task syz-executor.1:4775 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29184 4775 7994 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 lo_open+0x19/0xb0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1634 __blkdev_get+0xa8c/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1537 blkdev_get+0x88/0x890 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 syzkaller/managers/linux-4-14/kernel/fs/open.c:777 vfs_open+0x105/0x220 syzkaller/managers/linux-4-14/kernel/fs/open.c:888 do_last syzkaller/managers/linux-4-14/kernel/fs/namei.c:3428 [inline] path_openat+0x628/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3569 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4190f4 RSP: 002b:00007fb668e8ae20 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004bf878 RCX: 00000000004190f4 RDX: 0000000000000002 RSI: 00007fb668e8af40 RDI: 00000000ffffff9c RBP: 00007fb668e8af40 R08: 0000000000000000 R09: ffffffff00000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 0000000000000006 R14: 0000000020000220 R15: 0000000000000004 INFO: task syz-executor.3:4780 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28728 4780 7992 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 lo_open+0x19/0xb0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1634 __blkdev_get+0x306/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1470 blkdev_get+0x88/0x890 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 syzkaller/managers/linux-4-14/kernel/fs/open.c:777 vfs_open+0x105/0x220 syzkaller/managers/linux-4-14/kernel/fs/open.c:888 do_last syzkaller/managers/linux-4-14/kernel/fs/namei.c:3428 [inline] path_openat+0x628/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3569 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4190f4 RSP: 002b:00007fa00a19de20 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004bf878 RCX: 00000000004190f4 RDX: 0000000000000002 RSI: 00007fa00a19df40 RDI: 00000000ffffff9c RBP: 00007fa00a19df40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 0000000000000003 R14: 0000000020000608 R15: 0000000000000003 INFO: task syz-executor.3:4788 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29248 4788 7992 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 blkdev_get+0x88/0x890 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 syzkaller/managers/linux-4-14/kernel/fs/open.c:777 vfs_open+0x105/0x220 syzkaller/managers/linux-4-14/kernel/fs/open.c:888 do_last syzkaller/managers/linux-4-14/kernel/fs/namei.c:3428 [inline] path_openat+0x628/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3569 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4190f4 RSP: 002b:00007fa00a17ce20 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004bf878 RCX: 00000000004190f4 RDX: 0000000000000002 RSI: 00007fa00a17cf40 RDI: 00000000ffffff9c RBP: 00007fa00a17cf40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 0000000000000005 R14: 00000000200004e0 R15: 0000000000000004 INFO: task syz-executor.3:4795 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28968 4795 7992 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 blkdev_get+0x88/0x890 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1611 blkdev_open+0x1cc/0x250 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1772 do_dentry_open+0x44b/0xec0 syzkaller/managers/linux-4-14/kernel/fs/open.c:777 vfs_open+0x105/0x220 syzkaller/managers/linux-4-14/kernel/fs/open.c:888 do_last syzkaller/managers/linux-4-14/kernel/fs/namei.c:3428 [inline] path_openat+0x628/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3569 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4190f4 RSP: 002b:00007fa00a13ae20 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00000000004bf878 RCX: 00000000004190f4 RDX: 0000000000000002 RSI: 00007fa00a13af40 RDI: 00000000ffffff9c RBP: 00007fa00a13af40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 0000000000000003 R14: 0000000020000608 R15: 0000000000000003 INFO: task syz-executor.2:4781 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D29928 4781 7991 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 loop_control_ioctl+0x181/0x3f0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:2007 vfs_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:46 [inline] file_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:684 SYSC_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007fe12a671188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000001 RSI: 0000000000004c81 RDI: 0000000000000005 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff67a68faf R14: 00007fe12a671300 R15: 0000000000022000 INFO: task syz-executor.2:4789 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28432 4789 7991 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 loop_control_ioctl+0x67/0x3f0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1993 vfs_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:46 [inline] file_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:684 SYSC_ioctl syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 syzkaller/managers/linux-4-14/kernel/fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x465b09 RSP: 002b:00007fe12a650188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000000004c82 RDI: 0000000000000007 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007fff67a68faf R14: 00007fe12a650300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1531: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:4548 2 locks held by systemd-udevd/4626: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xd8/0x800 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1790 #1: (loop_index_mutex){+.+.}, at: [] lo_release+0x1b/0x190 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1677 1 lock held by in:imklog/7703: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 syzkaller/managers/linux-4-14/kernel/fs/file.c:769 1 lock held by syz-executor.4/7993: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 2 locks held by syz-executor.5/4764: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_put+0xd8/0x800 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1790 #1: (loop_index_mutex){+.+.}, at: [] lo_release+0x1b/0x190 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1677 2 locks held by syz-executor.1/4771: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1414 #1: (&bdev->bd_mutex){+.+.}, at: [] blkdev_reread_part+0x1b/0x40 syzkaller/managers/linux-4-14/kernel/block/ioctl.c:192 2 locks held by syz-executor.1/4775: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 #1: (loop_index_mutex){+.+.}, at: [] lo_open+0x19/0xb0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1634 2 locks held by syz-executor.3/4780: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 #1: (loop_index_mutex){+.+.}, at: [] lo_open+0x19/0xb0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1634 1 lock held by syz-executor.3/4788: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 1 lock held by syz-executor.3/4795: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 2 locks held by syz-executor.2/4781: #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1993 #1: (&lo->lo_ctl_mutex){+.+.}, at: [] loop_control_ioctl+0x181/0x3f0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:2007 1 lock held by syz-executor.2/4789: #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1993 1 lock held by syz-executor.2/4793: #0: (loop_index_mutex){+.+.}, at: [] loop_control_ioctl+0x67/0x3f0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1993 2 locks held by syz-executor.0/4787: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 #1: (loop_index_mutex){+.+.}, at: [] lo_open+0x19/0xb0 syzkaller/managers/linux-4-14/kernel/drivers/block/loop.c:1634 1 lock held by syz-executor.0/4791: #0: (&bdev->bd_mutex){+.+.}, at: [] __blkdev_get+0x191/0x1090 syzkaller/managers/linux-4-14/kernel/fs/block_dev.c:1455 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1531 Comm: khungtaskd Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/linux-4-14/kernel/./include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:274 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2857 Comm: kworker/u4:4 Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker task: ffff8880ac7e2080 task.stack: ffff8880ac070000 RIP: 0010:debug_lockdep_rcu_enabled syzkaller/managers/linux-4-14/kernel/kernel/rcu/update.c:300 [inline] RIP: 0010:debug_lockdep_rcu_enabled+0x8e/0xe0 syzkaller/managers/linux-4-14/kernel/kernel/rcu/update.c:297 RSP: 0018:ffff8880ac077cc8 EFLAGS: 00000a03 RAX: dffffc0000000000 RBX: ffff8880ac7e2080 RCX: 0000000000000001 RDX: 1ffff110158fc520 RSI: 0000000000000002 RDI: ffff8880ac7e2904 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000020012 R10: ffff8880ac7e2958 R11: ffff8880ac7e2080 R12: dffffc0000000000 R13: ffff8880ae699600 R14: ffff88813fe1a8c0 R15: ffff8880a4ad1c00 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc66e9d6000 CR3: 00000000a1b4b000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock syzkaller/managers/linux-4-14/kernel/./include/linux/rcupdate.h:681 [inline] batadv_nc_purge_orig_hash syzkaller/managers/linux-4-14/kernel/net/batman-adv/network-coding.c:420 [inline] batadv_nc_worker+0x56a/0xc50 syzkaller/managers/linux-4-14/kernel/net/batman-adv/network-coding.c:726 process_one_work+0x793/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2250 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Code: 8b 0d 47 f8 f6 07 85 c9 74 45 65 48 8b 1c 25 80 df 01 00 48 8d bb 84 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 32