Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci4 command 0x0419 tx timeout INFO: task kworker/u4:8:12160 blocked for more than 140 seconds. Not tainted 4.14.295-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:8 D26544 12160 2 0x80000000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 __synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898 quarantine_remove_cache+0xc7/0xd0 mm/kasan/quarantine.c:327 shutdown_cache+0xe/0x1e0 mm/slab_common.c:540 kmem_cache_destroy+0x1d2/0x240 mm/slab_common.c:842 tipc_server_stop+0x13a/0x180 net/tipc/server.c:637 tipc_topsrv_stop net/tipc/subscr.c:390 [inline] tipc_topsrv_exit_net+0x168/0x290 net/tipc/subscr.c:402 ops_exit_list+0xad/0x160 net/core/net_namespace.c:142 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:487 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Showing all locks held in the system: 1 lock held by khungtaskd/1534: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 6 locks held by kworker/u4:8/12160: #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x110/0x840 net/core/net_namespace.c:453 #3: (cpu_hotplug_lock.rw_sem){++++}, at: [] get_online_cpus include/linux/cpu.h:149 [inline] #3: (cpu_hotplug_lock.rw_sem){++++}, at: [] kmem_cache_destroy+0x1f/0x240 mm/slab_common.c:831 #4: (mem_hotplug_lock.rw_sem){.+.+}, at: [] kmem_cache_destroy+0x24/0x240 mm/slab_common.c:832 #5: (slab_mutex){+.+.}, at: [] kmem_cache_destroy+0x32/0x240 mm/slab_common.c:834 1 lock held by syz-executor.4/14588: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:413 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.295-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 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: 12168 Comm: kworker/u4:10 Not tainted 4.14.295-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: bat_events batadv_purge_orig task: ffff88804af30240 task.stack: ffff88804ae58000 RIP: 0010:check_preemption_disabled+0x40/0x240 lib/smp_processor_id.c:53 RSP: 0018:ffff8880ba507b88 EFLAGS: 00000206 RAX: 0000000000000001 RBX: ffffffff893d2ea0 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff87cd0680 RDI: ffffffff87cd06c0 RBP: ffff88804af30240 R08: ffffffff8ae15e92 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff85be7e48 R14: ffff88809b99ea44 R15: ffff88809b99ea40 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f27a918f008 CR3: 0000000050dad000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1186 [inline] rcu_lockdep_current_cpu_online+0x35/0x140 kernel/rcu/tree.c:1177 rcu_read_lock_sched_held+0xd3/0x1d0 kernel/rcu/update.c:113 trace_kmem_cache_free include/trace/events/kmem.h:144 [inline] kmem_cache_free+0x23a/0x2b0 mm/slab.c:3761 kfree_skbmem+0x98/0x100 net/core/skbuff.c:595 __kfree_skb net/core/skbuff.c:655 [inline] consume_skb+0xed/0x380 net/core/skbuff.c:714 can_receive+0x2f5/0x4b0 net/can/af_can.c:712 canfd_rcv+0xfc/0x180 net/can/af_can.c:764 __netif_receive_skb_core+0x15ee/0x2a30 net/core/dev.c:4474 __netif_receive_skb+0x27/0x1a0 net/core/dev.c:4512 process_backlog+0x218/0x6f0 net/core/dev.c:5195 napi_poll net/core/dev.c:5604 [inline] net_rx_action+0x466/0xfd0 net/core/dev.c:5670 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1016 do_softirq.part.0+0x154/0x1b0 kernel/softirq.c:332 do_softirq kernel/softirq.c:324 [inline] __local_bh_enable_ip+0x12b/0x170 kernel/softirq.c:185 spin_unlock_bh include/linux/spinlock.h:362 [inline] _batadv_purge_orig+0x400/0xef0 net/batman-adv/originator.c:1325 batadv_purge_orig+0x17/0x60 net/batman-adv/originator.c:1338 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 65 44 8b 25 b3 d8 e7 7c 65 8b 05 cc 36 e8 7c a9 ff ff ff 7f 74 18 e8 30 ff 3a fe e8 2b ff 3a fe 44 89 e0 5b 5d 41 5c 41 5d 41 5e <41> 5f c3 e8 18 ff 3a fe 48 c7 c0 c0 9a f0 88 48 ba 00 00 00 00