netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. INFO: task syz-executor.1:5491 blocked for more than 140 seconds. Not tainted 4.14.155-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25312 5491 1 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789 vfs_open+0x105/0x230 fs/open.c:903 do_last fs/namei.c:3539 [inline] path_openat+0xb6c/0x2be0 fs/namei.c:3681 do_filp_open+0x1a1/0x280 fs/namei.c:3715 do_sys_open+0x2ca/0x590 fs/open.c:1096 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4143b0 RSP: 002b:00007ffe75dce998 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000036ebf RCX: 00000000004143b0 RDX: 00007ffe75dcea2a RSI: 0000000000000002 RDI: 00007ffe75dcea20 RBP: 00000000000000f3 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe75dce9d0 R14: 0000000000036b88 R15: 00007ffe75dce9e0 INFO: task syz-executor.2:7173 blocked for more than 140 seconds. Not tainted 4.14.155-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D25312 7173 1 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789 vfs_open+0x105/0x230 fs/open.c:903 do_last fs/namei.c:3539 [inline] path_openat+0xb6c/0x2be0 fs/namei.c:3681 do_filp_open+0x1a1/0x280 fs/namei.c:3715 do_sys_open+0x2ca/0x590 fs/open.c:1096 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4143b0 RSP: 002b:00007ffcb5661d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000036fda RCX: 00000000004143b0 RDX: 00007ffcb5661e1a RSI: 0000000000000002 RDI: 00007ffcb5661e10 RBP: 00000000000000d7 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcb5661dc0 R14: 0000000000036cda R15: 00007ffcb5661dd0 INFO: task syz-executor.4:9907 blocked for more than 140 seconds. Not tainted 4.14.155-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D25312 9907 1 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789 vfs_open+0x105/0x230 fs/open.c:903 do_last fs/namei.c:3539 [inline] path_openat+0xb6c/0x2be0 fs/namei.c:3681 do_filp_open+0x1a1/0x280 fs/namei.c:3715 do_sys_open+0x2ca/0x590 fs/open.c:1096 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4143b0 RSP: 002b:00007ffcbe6058f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000036fa7 RCX: 00000000004143b0 RDX: 00007ffcbe60598a RSI: 0000000000000002 RDI: 00007ffcbe605980 RBP: 000000000000001a R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcbe605930 R14: 0000000000036c78 R15: 00007ffcbe605940 INFO: task syz-executor.0:10558 blocked for more than 140 seconds. Not tainted 4.14.155-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D26080 10558 9917 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 blkdev_reread_part+0x1b/0x40 block/ioctl.c:192 loop_reread_partitions+0x7f/0x90 drivers/block/loop.c:614 loop_clr_fd+0x835/0xad0 drivers/block/loop.c:1068 lo_ioctl+0x460/0x1a30 drivers/block/loop.c:1414 __blkdev_driver_ioctl block/ioctl.c:297 [inline] blkdev_ioctl+0x8d0/0x1870 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/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a4a7 RSP: 002b:00007ff01089a9f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff01089b6d4 RCX: 000000000045a4a7 RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000c R10: 0000000000000064 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000005 R15: 0000000000000001 INFO: task syz-executor.0:10563 blocked for more than 140 seconds. Not tainted 4.14.155-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27936 10563 9917 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 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/0xe20 fs/open.c:789 vfs_open+0x105/0x230 fs/open.c:903 do_last fs/namei.c:3539 [inline] path_openat+0xb6c/0x2be0 fs/namei.c:3681 do_filp_open+0x1a1/0x280 fs/namei.c:3715 do_sys_open+0x2ca/0x590 fs/open.c:1096 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4143d1 RSP: 002b:00007ff0108799f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ff01087a6d4 RCX: 00000000004143d1 RDX: 00007ff010879baa RSI: 0000000000000002 RDI: 00007ff010879ba0 RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000293 R12: 0000000000000004 R13: 0000000000000004 R14: 00007ff01087a6d4 R15: 00000000ffffffff INFO: task syz-executor.5:10580 blocked for more than 140 seconds. Not tainted 4.14.155-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29792 10580 8534 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 loop_control_ioctl+0x183/0x310 drivers/block/loop.c:1997 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/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a639 RSP: 002b:00007fb46ee8fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000008 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb46ee906d4 R13: 00000000004c409c R14: 00000000004d8698 R15: 00000000ffffffff INFO: task blkid:10581 blocked for more than 140 seconds. Not tainted 4.14.155-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. blkid D28608 10581 7752 0x00000004 Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3499 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3557 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 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+0x6d6/0xf90 fs/block_dev.c:1517 blkdev_get+0x97/0x8b0 fs/block_dev.c:1612 blkdev_open+0x1cc/0x250 fs/block_dev.c:1770 do_dentry_open+0x44e/0xe20 fs/open.c:789 vfs_open+0x105/0x230 fs/open.c:903 do_last fs/namei.c:3539 [inline] path_openat+0xb6c/0x2be0 fs/namei.c:3681 do_filp_open+0x1a1/0x280 fs/namei.c:3715 do_sys_open+0x2ca/0x590 fs/open.c:1096 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f6d8bfa1120 RSP: 002b:00007ffe25f27458 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6d8bfa1120 RDX: 00007ffe25f27f29 RSI: 0000000000000000 RDI: 00007ffe25f27f29 RBP: 0000000000000000 R08: 0000000000000078 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001386030 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000005 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [<00000000b15c4b1c>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 1 lock held by rsyslogd/1640: #0: (&f->f_pos_lock){+.+.}, at: [<0000000069582cb6>] __fdget_pos+0xb5/0xd0 fs/file.c:769 2 locks held by getty/1768: #0: (&tty->ldisc_sem){++++}, at: [<000000005e1e1946>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000077f1bbb3>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.1/5491: #0: (&bdev->bd_mutex){+.+.}, at: [<000000003f39aecb>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 #1: (loop_index_mutex){+.+.}, at: [<0000000016471363>] lo_open+0x19/0xb0 drivers/block/loop.c:1624 2 locks held by syz-executor.2/7173: #0: (&bdev->bd_mutex){+.+.}, at: [<000000003f39aecb>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 #1: (loop_index_mutex){+.+.}, at: [<0000000016471363>] lo_open+0x19/0xb0 drivers/block/loop.c:1624 2 locks held by syz-executor.4/9907: #0: (&bdev->bd_mutex){+.+.}, at: [<000000003f39aecb>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 #1: (loop_index_mutex){+.+.}, at: [<0000000016471363>] lo_open+0x19/0xb0 drivers/block/loop.c:1624 2 locks held by syz-executor.0/10558: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<00000000b591c6ea>] lo_ioctl+0x86/0x1a30 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.}, at: [<00000000f0310256>] blkdev_reread_part+0x1b/0x40 block/ioctl.c:192 1 lock held by syz-executor.0/10563: #0: (&bdev->bd_mutex){+.+.}, at: [<000000003f39aecb>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 2 locks held by syz-executor.5/10580: #0: (loop_index_mutex){+.+.}, at: [<0000000099a9685c>] loop_control_ioctl+0x71/0x310 drivers/block/loop.c:1983 #1: (&lo->lo_ctl_mutex#2){+.+.}, at: [<00000000ec13b594>] loop_control_ioctl+0x183/0x310 drivers/block/loop.c:1997 3 locks held by blkid/10581: #0: (&bdev->bd_mutex){+.+.}, at: [<000000003f39aecb>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 #1: (&bdev->bd_mutex/1){+.+.}, at: [<000000003f39aecb>] __blkdev_get+0xf3/0xf90 fs/block_dev.c:1457 #2: (loop_index_mutex){+.+.}, at: [<0000000016471363>] lo_open+0x19/0xb0 drivers/block/loop.c:1624 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.155-syzkaller #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xe5/0x154 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x119/0x147 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+0x629/0xbe0 kernel/hung_task.c:274 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1638 Comm: rs:main Q:Reg Not tainted 4.14.155-syzkaller #0 task: 000000008468845f task.stack: 00000000abec35ff RIP: 0010:__lock_acquire+0x9e0/0x4320 kernel/locking/lockdep.c:3522 RSP: 0018:ffff8881d42570d0 EFLAGS: 00000046 RAX: 0000000000000001 RBX: ffffffff853204a0 RCX: 1ffff1103a8cb409 RDX: 1ffff1103a8cb3f5 RSI: 0000000000000000 RDI: ffffffff853204b8 RBP: ffff8881d42572a0 R08: 0000000000005aa2 R09: 0000000000000003 R10: ffff8881d465a028 R11: f6dc2f3d246349d8 R12: dffffc0000000000 R13: f6dc2f3d246349d8 R14: ffff8881d4659780 R15: 0000000000000001 FS: 00007fbf867e7700(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000256a018 CR3: 00000001d6f18003 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x12b/0x360 kernel/locking/lockdep.c:3994 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:160 __debug_check_no_obj_freed lib/debugobjects.c:738 [inline] debug_check_no_obj_freed+0x148/0x5c0 lib/debugobjects.c:776 free_pages_prepare mm/page_alloc.c:1133 [inline] __free_pages_ok+0x34f/0x19a0 mm/page_alloc.c:1330 mm_free_pgd kernel/fork.c:757 [inline] __mmdrop+0x61/0x280 kernel/fork.c:922 mmdrop include/linux/sched/mm.h:43 [inline] finish_task_switch+0x23f/0x660 kernel/sched/core.c:2739 context_switch kernel/sched/core.c:2870 [inline] __schedule+0x894/0x1f80 kernel/sched/core.c:3455 preempt_schedule_common+0x4f/0xd0 kernel/sched/core.c:3579 ___preempt_schedule+0x16/0x18 rcu_read_unlock_sched include/linux/rcupdate.h:768 [inline] percpu_ref_put_many include/linux/percpu-refcount.h:280 [inline] percpu_ref_put include/linux/percpu-refcount.h:294 [inline] blk_queue_exit+0x165/0x1e0 block/blk-core.c:811 generic_make_request block/blk-core.c:2230 [inline] generic_make_request+0x21e/0x880 block/blk-core.c:2172 submit_bio+0xa7/0x390 block/blk-core.c:2317 submit_bh_wbc.isra.0+0x45c/0x600 fs/buffer.c:3152 submit_bh fs/buffer.c:3158 [inline] __sync_dirty_buffer+0xda/0x1e0 fs/buffer.c:3244 ext4_write_inode+0x3bd/0x450 fs/ext4/inode.c:5342 write_inode fs/fs-writeback.c:1227 [inline] __writeback_single_inode+0x87c/0x10a0 fs/fs-writeback.c:1426 writeback_single_inode+0x1ff/0x370 fs/fs-writeback.c:1480 sync_inode fs/fs-writeback.c:2508 [inline] sync_inode_metadata+0xb8/0xf0 fs/fs-writeback.c:2528 __generic_file_fsync+0x121/0x190 fs/libfs.c:992 ext4_sync_file+0x3ac/0x1250 fs/ext4/fsync.c:120 vfs_fsync_range+0x106/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2713 [inline] ext4_file_write_iter+0x883/0xdb0 fs/ext4/file.c:279 call_write_iter include/linux/fs.h:1798 [inline] new_sync_write fs/read_write.c:471 [inline] __vfs_write+0x401/0x5a0 fs/read_write.c:484 vfs_write+0x17f/0x4d0 fs/read_write.c:546 SYSC_write fs/read_write.c:594 [inline] SyS_write+0x102/0x250 fs/read_write.c:586 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7fbf8824519d RSP: 002b:00007fbf867e6000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000000000e6 RCX: 00007fbf8824519d RDX: 00000000000000e6 RSI: 0000000000fc4ce0 RDI: 0000000000000006 RBP: 0000000000fc4ce0 R08: 3020343220766f4e R09: 2032323a35303a36 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fbf867e6480 R14: 0000000000000002 R15: 0000000000fc4ae0 Code: 00 48 c7 00 00 00 00 00 48 c7 40 08 00 00 00 00 c7 40 18 00 00 00 00 44 89 f8 48 8b b4 24 98 01 00 00 65 48 33 34 25 28 00 00 00 <0f> 85 f9 22 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3