devpts: called with bogus options ip6_tunnel: ip6tnl1 xmit: Local address not yet configured! INFO: task syz-executor.1:2123 blocked for more than 140 seconds. Not tainted 4.9.188+ #19 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25528 2123 1 0x00000004 0000000000000087 ffff8801cebc0000 ffff8801cffd8b00 ffff8801db621000 ffff8801cfc60000 ffff8801db621018 ffff8801a7397598 ffffffff8281749e ffffffff82e2e6d8 ffffffff8120bd30 00ffffff83c84a40 ffff8801db6218f0 Call Trace: [<000000007eda8cba>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000896006d6>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000491a634e>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000491a634e>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<0000000048b675d6>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 [<00000000b798c0c5>] fuse_lookup+0x89/0x3b0 fs/fuse/dir.c:406 [<000000005f760045>] lookup_slow+0x24b/0x480 fs/namei.c:1709 [<0000000084f00cf9>] walk_component+0x71e/0xce0 fs/namei.c:1825 [<00000000e0e64a71>] link_path_walk+0x8b4/0x1210 fs/namei.c:2161 [<000000002719654a>] path_mountpoint+0x67/0x6d0 fs/namei.c:2737 [<00000000acab80ef>] filename_mountpoint+0x17f/0x350 fs/namei.c:2758 [<000000001c8694c2>] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788 [<000000009b15f4af>] SYSC_umount fs/namespace.c:1722 [inline] [<000000009b15f4af>] SyS_umount+0x136/0xd30 fs/namespace.c:1706 [<000000008d5e8e8f>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000007e671cd5>] 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: [<00000000aadb5af6>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000aadb5af6>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<00000000247827bf>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1914: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000c886ff97>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2041: #0: (&tty->ldisc_sem){++++++}, at: [<00000000ecea8483>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377 #1: (&ldata->atomic_read_lock){+.+.+.}, at: [<000000009bdacf66>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 2 locks held by syz-executor.1/2123: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<00000000b12fd948>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<00000000b12fd948>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<0000000048b675d6>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 2 locks held by syz-executor.1/24240: #0: (sb_writers#10){.+.+.+}, at: [<000000003189ae35>] sb_start_write include/linux/fs.h:1579 [inline] #0: (sb_writers#10){.+.+.+}, at: [<000000003189ae35>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: (&type->i_mutex_dir_key#7){++++++}, at: [<000000004b5977e9>] inode_lock include/linux/fs.h:771 [inline] #1: (&type->i_mutex_dir_key#7){++++++}, at: [<000000004b5977e9>] utimes_common.isra.0+0x2bf/0x5f0 fs/utimes.c:93 2 locks held by syz-executor.1/25144: #0: (sb_writers#10){.+.+.+}, at: [<000000003189ae35>] sb_start_write include/linux/fs.h:1579 [inline] #0: (sb_writers#10){.+.+.+}, at: [<000000003189ae35>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: (&type->i_mutex_dir_key#7){++++++}, at: [<000000004b5977e9>] inode_lock include/linux/fs.h:771 [inline] #1: (&type->i_mutex_dir_key#7){++++++}, at: [<000000004b5977e9>] utimes_common.isra.0+0x2bf/0x5f0 fs/utimes.c:93 2 locks held by syz-executor.1/26026: #0: (sb_writers#10){.+.+.+}, at: [<000000003189ae35>] sb_start_write include/linux/fs.h:1579 [inline] #0: (sb_writers#10){.+.+.+}, at: [<000000003189ae35>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391 #1: (&type->i_mutex_dir_key#7){++++++}, at: [<000000004b5977e9>] inode_lock include/linux/fs.h:771 [inline] #1: (&type->i_mutex_dir_key#7){++++++}, at: [<000000004b5977e9>] utimes_common.isra.0+0x2bf/0x5f0 fs/utimes.c:93 2 locks held by syz-executor.1/26195: #0: (&type->i_mutex_dir_key#7){++++++}, at: [<00000000b12fd948>] inode_lock_shared include/linux/fs.h:781 [inline] #0: (&type->i_mutex_dir_key#7){++++++}, at: [<00000000b12fd948>] lookup_slow+0x160/0x480 fs/namei.c:1686 #1: (&fi->mutex){+.+.+.}, at: [<0000000048b675d6>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.188+ #19 ffff8801d98d7cc8 ffffffff81b64a21 0000000000000001 0000000000000000 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6fcbc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<0000000046658ab8>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000046658ab8>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000a83481df>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000008c69feb5>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000799f771e>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000cad7b354>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000cad7b354>] check_hung_task kernel/hung_task.c:126 [inline] [<00000000cad7b354>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<00000000cad7b354>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000b0408803>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000cbcb20b6>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff828265f1