Bluetooth: hci6: command 0x1003 tx timeout Bluetooth: hci6: unexpected event for opcode 0x0c03 INFO: task kworker/0:3:8986 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:3 D26192 8986 2 0x80000000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4476 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 4 locks held by systemd/1: 3 locks held by kworker/1:1/33: #0: 000000001d109a37 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000e239ae0c (deferred_process_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 000000009c580eb2 (rtnl_mutex){+.+.}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150 1 lock held by khungtaskd/1570: #0: 000000007d5ea7d6 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 2 locks held by kworker/u4:4/2895: 1 lock held by systemd-udevd/4700: 1 lock held by in:imklog/7815: 1 lock held by syz-fuzzer/8141: 2 locks held by syz-fuzzer/10098: 2 locks held by syz-executor.2/8165: 3 locks held by kworker/0:3/8986: #0: 00000000dc22c871 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000e916de13 ((addr_chk_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 000000009c580eb2 (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4476 5 locks held by kworker/u4:13/11078: 3 locks held by syz-executor.4/15104: #0: 0000000017ec102d (&hdev->req_lock){+.+.}, at: hci_dev_do_close+0x122/0x1020 net/bluetooth/hci_core.c:1629 #1: 000000007ee85eca (&hdev->lock){+.+.}, at: hci_dev_do_close+0x343/0x1020 net/bluetooth/hci_core.c:1674 #2: 00000000970c123c (uevent_sock_mutex){+.+.}, at: kobject_uevent_env+0x85d/0x1480 lib/kobject_uevent.c:584 3 locks held by syz-executor.0/15126: 2 locks held by syz-executor.5/15179: 4 locks held by syz-executor.3/15184: 1 lock held by syz-executor.1/15186: #0: 000000009c580eb2 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 000000009c580eb2 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779 1 lock held by syz-executor.5/15191: 4 locks held by kworker/u5:1/15193: #0: 0000000081de4ccd ((wq_completion)"%s"hdev->name#2){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 0000000012525e14 ((work_completion)(&hdev->rx_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 0000000045e9406a (&hdev->lock){+.+.}, at: hci_conn_complete_evt net/bluetooth/hci_event.c:2415 [inline] #2: 0000000045e9406a (&hdev->lock){+.+.}, at: hci_event_packet+0x2294/0x7e20 net/bluetooth/hci_event.c:5825 #3: 00000000970c123c (uevent_sock_mutex){+.+.}, at: kobject_uevent_env+0x85d/0x1480 lib/kobject_uevent.c:584 1 lock held by systemd-cgroups/15194: #0: 0000000026ad3b85 (&mm->mmap_sem){++++}, at: __access_remote_vm+0xa4/0x5f0 mm/memory.c:4628 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2895 Comm: kworker/u4:4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Workqueue: bat_events batadv_tt_purge RIP: 0010:deref_stack_reg+0x13/0x1d0 arch/x86/kernel/unwind_orc.c:330 Code: ef e8 21 e6 6e 00 0f b6 44 24 04 eb a0 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 56 41 55 49 89 d5 41 54 <49> 89 fc 55 48 89 f5 53 48 83 ec 68 48 c7 44 24 08 b3 8a b5 41 48 RSP: 0000:ffff8880ba107570 EFLAGS: 00000083 RAX: dffffc0000000000 RBX: 1ffff11017420ebb RCX: ffffffff8b99d3bf RDX: ffff8880ba107700 RSI: ffff8880ba107998 RDI: ffff8880ba1076c0 RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000000001 R10: ffff8880ba10771f R11: 0000000000074071 R12: ffff8880ba1079b8 R13: ffff8880ba107700 R14: ffff8880ba1076c0 R15: ffffffff8b99d3ba FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f715e014008 CR3: 0000000098f83000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xf83/0x1400 arch/x86/kernel/unwind_orc.c:555 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x126/0x1f0 mm/kasan/kasan.c:521 __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 kfree_skbmem+0xc1/0x140 net/core/skbuff.c:595 __kfree_skb net/core/skbuff.c:655 [inline] consume_skb+0x120/0x3d0 net/core/skbuff.c:714 can_create_echo_skb include/linux/can/skb.h:77 [inline] vxcan_xmit+0x781/0xd20 drivers/net/can/vxcan.c:65 __netdev_start_xmit include/linux/netdevice.h:4349 [inline] netdev_start_xmit include/linux/netdevice.h:4363 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 can_send+0x4be/0xa00 net/can/af_can.c:297 bcm_can_tx+0x565/0x800 net/can/bcm.c:300 bcm_tx_timeout_tsklet+0x1f0/0x3a0 net/can/bcm.c:414 tasklet_action_common.constprop.0+0x265/0x360 kernel/softirq.c:522 __do_softirq+0x265/0x980 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1092 do_softirq.part.0+0x160/0x1c0 kernel/softirq.c:336 do_softirq kernel/softirq.c:328 [inline] __local_bh_enable_ip+0x20e/0x270 kernel/softirq.c:189 spin_unlock_bh include/linux/spinlock.h:374 [inline] batadv_tt_global_purge net/batman-adv/translation-table.c:2541 [inline] batadv_tt_purge+0x386/0xa00 net/batman-adv/translation-table.c:3812 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415