Bluetooth: hci5 command 0x0406 tx timeout Bluetooth: hci0 command 0x0406 tx timeout Bluetooth: hci3 command 0x0406 tx timeout NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task kworker/u4:1:22 blocked for more than 140 seconds. Not tainted 4.14.193-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:1 D26232 22 2 0x80000000 Workqueue: netns cleanup_net 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 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 cleanup_net+0x110/0x840 net/core/net_namespace.c:450 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task syz-executor.0:8443 blocked for more than 140 seconds. Not tainted 4.14.193-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29000 8443 6366 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 exp_funnel_lock kernel/rcu/tree_exp.h:295 [inline] _synchronize_rcu_expedited+0x5f6/0x770 kernel/rcu/tree_exp.h:596 synchronize_rcu+0x98/0x130 kernel/rcu/tree_plugin.h:762 synchronize_net+0x3a/0x40 net/core/dev.c:8241 nf_register_net_hook+0x6a5/0xa40 net/netfilter/core.c:294 nf_register_net_hooks+0x47/0x96 net/netfilter/core.c:382 ops_init+0xaa/0x3e0 net/core/net_namespace.c:118 setup_net+0x22f/0x530 net/core/net_namespace.c:295 copy_net_ns+0x19b/0x440 net/core/net_namespace.c:419 create_new_namespaces+0x375/0x720 kernel/nsproxy.c:107 copy_namespaces+0x27b/0x310 kernel/nsproxy.c:165 copy_process.part.0+0x2600/0x6f00 kernel/fork.c:1774 copy_process kernel/fork.c:1586 [inline] _do_fork+0x184/0xc80 kernel/fork.c:2070 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45d239 RSP: 002b:00007fabc4805c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000001f40 RCX: 000000000045d239 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000053003903 RBP: 000000000118d170 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d12c R13: 00007fff706a63df R14: 00007fabc48069c0 R15: 000000000118d12c Showing all locks held in the system: 3 locks held by kworker/u4:1/22: #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x110/0x840 net/core/net_namespace.c:450 1 lock held by khungtaskd/1067: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor.0/8443: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:410 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1067 Comm: khungtaskd Not tainted 4.14.193-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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3652 Comm: systemd-journal Not tainted 4.14.193-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880943cc340 task.stack: ffff8880943d0000 RIP: 0010:__save_stack_trace+0x0/0x160 arch/x86/kernel/stacktrace.c:36 RSP: 0018:ffff8880943d7b50 EFLAGS: 00000246 RAX: ffff8880943d7b78 RBX: ffff888086a35840 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff8880943cc340 RDI: ffff8880943d7b60 RBP: ffff888086a35840 R08: ffffed1010d46908 R09: ffffed1010d46b08 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000014000c0 R13: 0000000000000000 R14: ffff8880aa58bcc0 R15: 0000000000001000 FS: 00007fc925e158c0(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc923151000 CR3: 00000000947d2000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550 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: 0033:0x7fc9250d19c7 RSP: 002b:00007ffd4adf6788 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffd4adf97b0 RCX: 00007fc9250d19c7 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000055e298d209a3 RBP: 00007ffd4adf68d0 R08: 000055e298d163e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000055e29a4e08c0 R15: 00007ffd4adf6dc0 Code: e6 8b eb c0 e6 82 89 fa ee ee 8d 57 01 ee ee eb cd e6 81 eb f1 e6 87 eb ed e6 83 eb e9 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 41 55 41 89 cd 41 54 49 89 fc 53 48 83 ec 68 48 85