team0 (unregistering): Port device team_slave_0 removed bond0 (unregistering): Releasing backup interface bond_slave_1 bond0 (unregistering): Releasing backup interface bond_slave_0 bond0 (unregistering): Released all slaves INFO: task syz-executor.4:19174 blocked for more than 140 seconds. Not tainted 4.14.198-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28656 19174 11826 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 request_wait_answer+0x30d/0x620 fs/fuse/dev.c:478 __fuse_request_send+0x108/0x1a0 fs/fuse/dev.c:498 fuse_request_send fs/fuse/dev.c:511 [inline] fuse_simple_request+0x2fa/0x790 fs/fuse/dev.c:569 fuse_lookup_name+0x228/0x550 fs/fuse/dir.c:330 fuse_lookup+0xcd/0x390 fs/fuse/dir.c:368 lookup_slow+0x20a/0x400 fs/namei.c:1696 mountpoint_last fs/namei.c:2688 [inline] path_mountpoint+0x5d0/0x940 fs/namei.c:2719 filename_mountpoint+0x162/0x490 fs/namei.c:2745 SYSC_umount fs/namespace.c:1730 [inline] SyS_umount+0x125/0xeb0 fs/namespace.c:1714 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45dd99 RSP: 002b:00007f35cca49c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000036e40 RCX: 000000000045dd99 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffe5d5e2bff R14: 00007f35cca4a9c0 R15: 000000000118bf2c Showing all locks held in the system: 1 lock held by khungtaskd/1068: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by syz-executor.4/19174: #0: (&type->i_mutex_dir_key#8){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] #0: (&type->i_mutex_dir_key#8){++++}, at: [] lookup_slow+0x129/0x400 fs/namei.c:1674 #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xb0/0xe0 fs/fuse/inode.c:365 2 locks held by syz-executor.3/19177: #0: (&type->i_mutex_dir_key#8){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] #0: (&type->i_mutex_dir_key#8){++++}, at: [] lookup_slow+0x129/0x400 fs/namei.c:1674 #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xb0/0xe0 fs/fuse/inode.c:365 2 locks held by syz-executor.0/19180: #0: (&type->i_mutex_dir_key#8){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] #0: (&type->i_mutex_dir_key#8){++++}, at: [] lookup_slow+0x129/0x400 fs/namei.c:1674 #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xb0/0xe0 fs/fuse/inode.c:365 2 locks held by syz-executor.2/19276: #0: (&type->i_mutex_dir_key#8){++++}, at: [] inode_lock_shared include/linux/fs.h:729 [inline] #0: (&type->i_mutex_dir_key#8){++++}, at: [] lookup_slow+0x129/0x400 fs/namei.c:1674 #1: (&fi->mutex){+.+.}, at: [] fuse_lock_inode+0xb0/0xe0 fs/fuse/inode.c:365 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1068 Comm: khungtaskd Not tainted 4.14.198-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f 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+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3635 Comm: systemd-journal Not tainted 4.14.198-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888094f00600 task.stack: ffff888094f08000 RIP: 0010:preempt_count_add+0x0/0x170 kernel/sched/core.c:3099 RSP: 0018:ffff888094f0fa10 EFLAGS: 00000246 RAX: ffff888094f0fe30 RBX: 1ffff110129e1f4a RCX: 0000000000000004 RDX: 1ffff110129e1f62 RSI: ffff888094f0f9c8 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001 R10: ffff888094f0fe30 R11: 0000000000000001 R12: ffff888094f0fb60 R13: ffff888094f0fb10 R14: ffff8880aa58ccc0 R15: ffff888094f0fad8 FS: 00007fbb6f51c8c0(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb6cacf020 CR3: 0000000094f73000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xc2/0x17d0 arch/x86/kernel/unwind_orc.c:340 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552 getname_flags+0xc8/0x550 fs/namei.c:138 user_path_at_empty+0x2a/0x50 fs/namei.c:2631 user_path_at include/linux/namei.h:57 [inline] SYSC_faccessat fs/open.c:403 [inline] SyS_faccessat+0x21b/0x680 fs/open.c:353 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fbb6e7d89c7 RSP: 002b:00007ffcc317dd48 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffcc3180d70 RCX: 00007fbb6e7d89c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000560c17b5a9a3 RBP: 00007ffcc317de90 R08: 0000560c17b503e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000560c188da8c0 R15: 00007ffcc317e380 Code: ff ff 48 c7 c7 40 2b 68 8a e8 cd d3 46 00 eb d1 48 c7 c7 40 2b 68 8a e8 bf d3 46 00 e9 72 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 <48> b8 00 00 00 00 00 fc ff df 55 89 fd 53 48 c7 c3 00 8c 5a 8a