INFO: task hung in hci_remote_features_evt

Status: auto-obsoleted due to no activity on 2025/03/09 20:58
Reported-by: syzbot+b963594de699ca096856@syzkaller.appspotmail.com
First crash: 635d, last: 635d
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in hci_remote_features_evt 1 3 659d 665d 0/3 auto-obsoleted due to no activity on 2025/02/14 05:43
linux-6.1 INFO: task hung in hci_remote_features_evt (2) origin:upstream missing-backport 1 syz error 2 228d 238d 0/3 upstream: reported syz repro on 2025/12/31 11:22
upstream INFO: task hung in hci_remote_features_evt (2) prio:high bluetooth 1 syz error inconclusive 9 332d 477d 0/29 upstream: reported syz repro on 2025/05/07 00:51
upstream INFO: task hung in hci_remote_features_evt bluetooth 1 9 687d 783d 0/29 auto-obsoleted due to no activity on 2025/01/07 02:12

Sample crash report:
INFO: task kworker/u5:6:4265 blocked for more than 142 seconds.
      Not tainted 6.1.119-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:6    state:D stack:25952 pid:4265  ppid:2      flags:0x00004000
Workqueue: hci14 hci_rx_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 hci_connect_cfm include/net/bluetooth/hci_core.h:1784 [inline]
 hci_remote_features_evt+0x615/0xa60 net/bluetooth/hci_event.c:3803
 hci_event_func net/bluetooth/hci_event.c:7373 [inline]
 hci_event_packet+0xa9d/0x1510 net/bluetooth/hci_event.c:7425
 hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4085
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task kworker/u5:8:4267 blocked for more than 142 seconds.
      Not tainted 6.1.119-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:8    state:D stack:26624 pid:4267  ppid:2      flags:0x00004000
Workqueue: hci13 hci_rx_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 hci_connect_cfm include/net/bluetooth/hci_core.h:1784 [inline]
 hci_remote_features_evt+0x615/0xa60 net/bluetooth/hci_event.c:3803
 hci_event_func net/bluetooth/hci_event.c:7373 [inline]
 hci_event_packet+0xa9d/0x1510 net/bluetooth/hci_event.c:7425
 hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4085
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
INFO: task kworker/0:9:4789 blocked for more than 147 seconds.
      Not tainted 6.1.119-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:9     state:D stack:25256 pid:4789  ppid:2      flags:0x00004000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 addrconf_verify_work+0x15/0x30 net/ipv6/addrconf.c:4656
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Showing all locks held in the system:

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/29 20:57 linux-6.1.y e4d90d63d385 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in hci_remote_features_evt
* Struck through repros no longer work on HEAD.