netlink: 68 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 68 bytes leftover after parsing attributes in process `syz-executor.2'. INFO: task syz-executor.1:2112 blocked for more than 140 seconds. Not tainted 4.9.182+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25352 2112 1 0x00000004 0000000000000087 ffff8801cba2df00 0000000000000000 ffff8801db621000 ffffffff83031180 ffff8801db621018 ffff8801a8cb76a8 ffffffff8280a19e 0000000000000246 ffffffff831f2f48 00ff8801cba2e7a8 ffff8801db6218f0 Call Trace: [<00000000925bebf4>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000e2e46ed2>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000e5b3bb04>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000e5b3bb04>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 [<00000000aee4b8ca>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424 [<000000005d4ef2f9>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579 [<00000000403a00fa>] do_dentry_open+0x422/0xd20 fs/open.c:772 [<00000000bff1beab>] vfs_open+0x105/0x230 fs/open.c:885 [<00000000dcd4e78d>] do_last fs/namei.c:3457 [inline] [<00000000dcd4e78d>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<00000000b4715857>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<00000000e53138c2>] do_sys_open+0x2f0/0x610 fs/open.c:1078 [<0000000098f23f0f>] SYSC_open fs/open.c:1096 [inline] [<0000000098f23f0f>] SyS_open+0x2d/0x40 fs/open.c:1091 [<0000000019dd785c>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000007653fb9c>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<00000000a8d02949>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000a8d02949>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.?..}, at: [<000000009a6fa36c>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 2 locks held by rs:main Q:Reg/1906: #0: (&f->f_pos_lock){+.+.+.}, at: [<0000000084fb2b8e>] __fdget_pos+0xa8/0xd0 fs/file.c:782 #1: (sb_writers#4){.+.+.+}, at: [<00000000fa578a7d>] file_start_write include/linux/fs.h:2646 [inline] #1: (sb_writers#4){.+.+.+}, at: [<00000000fa578a7d>] vfs_write+0x3e9/0x520 fs/read_write.c:558 1 lock held by rsyslogd/1909: #0: (&f->f_pos_lock){+.+.+.}, at: [<0000000084fb2b8e>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2036: #0: (&tty->ldisc_sem){++++++}, at: [<00000000b880a461>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<000000001cce71c1>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.1/2112: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.4/3460: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000254e7c88>] __blkdev_put+0xbb/0x840 fs/block_dev.c:1587 #1: (loop_index_mutex){+.+.+.}, at: [<000000001b672197>] lo_release+0x20/0x1b0 drivers/block/loop.c:1663 1 lock held by syz-executor.5/6533: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by syz-executor.5/6544: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by syz-executor.4/6530: #0: (loop_index_mutex){+.+.+.}, at: [<000000001b5f6acc>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 #1: (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<000000009491767b>] loop_control_ioctl+0x17f/0x320 drivers/block/loop.c:1987 1 lock held by syz-executor.4/6534: #0: (loop_index_mutex){+.+.+.}, at: [<000000001b5f6acc>] loop_control_ioctl+0x7a/0x320 drivers/block/loop.c:1973 2 locks held by syz-executor.0/6543: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000d6d0b49e>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (&bdev->bd_mutex){+.+.+.}, at: [<000000001637b7f0>] blkdev_reread_part+0x1f/0x40 block/ioctl.c:189 1 lock held by syz-executor.0/6548: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 2 locks held by blkid/6547: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000017716119>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 2 locks held by blkid/6552: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000017716119>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 2 locks held by blkid/6555: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 #1: (loop_index_mutex){+.+.+.}, at: [<0000000017716119>] lo_open+0x1d/0xb0 drivers/block/loop.c:1621 1 lock held by blkid/6582: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000cf5eaa10>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.182+ #3 ffff8801d98d7cc8 ffffffff81b57e21 0000000000000000 0000000000000000 0000000000000000 ffffffff81099901 dffffc0000000000 ffff8801d98d7d00 ffffffff81b630bc 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<000000003afeb63f>] __dump_stack lib/dump_stack.c:15 [inline] [<000000003afeb63f>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<0000000045689f56>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<0000000066fe5343>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<0000000052764faa>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000001ade2cf9>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000001ade2cf9>] check_hung_task kernel/hung_task.c:126 [inline] [<000000001ade2cf9>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000001ade2cf9>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000bcc229e8>] kthread+0x278/0x310 kernel/kthread.c:211 [<000000009def5eaf>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff828192f1