syzbot


INFO: task hung in hci_conn_failed

Status: upstream: reported C repro on 2024/01/27 23:34
Subsystems: bluetooth
[Documentation on labels]
Reported-by: syzbot+a984066a63e9c1e62662@syzkaller.appspotmail.com
First crash: 83d, last: 36d
Cause bisection: introduced by (bisect log) :
commit 5af1f84ed13a416297ab9ced7537f4d5ae7f329a
Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date: Thu Aug 3 18:04:51 2023 +0000

  Bluetooth: hci_sync: Fix UAF on hci_abort_conn_sync

Crash: INFO: task hung in hci_conn_failed (log)
Repro: C syz .config
  
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [bluetooth?] INFO: task hung in hci_conn_failed 12 (18) 2024/01/31 11:29
Last patch testing requests (6)
Created Duration User Patch Repo Result
2024/02/07 12:02 27m retest repro upstream OK log
2024/01/31 10:27 21m hdanton@sina.com https://github.com/fbq/linux.git rcu-exp.2024.01.29b OK log
2024/01/30 11:31 2h52m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log
2024/01/28 11:28 30m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master OK log
2024/01/28 09:15 9m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master error OK
2024/01/28 01:31 46m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master report log
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2024/03/11 04:37 4h16m bisect fix upstream job log (0) log

Sample crash report:
INFO: task kworker/u5:3:5119 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc1-syzkaller-00026-g7ed2632ec7d7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:3    state:D stack:27264 pid:5119  tgid:5119  ppid:2      flags:0x00004000
Workqueue: hci5 hci_cmd_sync_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf12/0x5c00 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6817
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
 hci_connect_cfm include/net/bluetooth/hci_core.h:1983 [inline]
 hci_conn_failed+0x158/0x370 net/bluetooth/hci_conn.c:1289
 hci_abort_conn_sync+0x758/0xb50 net/bluetooth/hci_sync.c:5356
 abort_conn_sync+0x187/0x390 net/bluetooth/hci_conn.c:2988
 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:306
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2787
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
INFO: task kworker/u5:5:5122 blocked for more than 146 seconds.
      Not tainted 6.8.0-rc1-syzkaller-00026-g7ed2632ec7d7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:5    state:D stack:27536 pid:5122  tgid:5122  ppid:2      flags:0x00004000
Workqueue: hci1 hci_cmd_sync_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf12/0x5c00 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6817
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
 hci_connect_cfm include/net/bluetooth/hci_core.h:1983 [inline]
 hci_conn_failed+0x158/0x370 net/bluetooth/hci_conn.c:1289
 hci_abort_conn_sync+0x758/0xb50 net/bluetooth/hci_sync.c:5356
 abort_conn_sync+0x187/0x390 net/bluetooth/hci_conn.c:2988
 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:306
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2787
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
INFO: task kworker/u5:8:5131 blocked for more than 148 seconds.
      Not tainted 6.8.0-rc1-syzkaller-00026-g7ed2632ec7d7 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:8    state:D stack:27808 pid:5131  tgid:5131  ppid:2      flags:0x00004000
Workqueue: hci4 hci_cmd_sync_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf12/0x5c00 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6817
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:752
 hci_connect_cfm include/net/bluetooth/hci_core.h:1983 [inline]
 hci_conn_failed+0x158/0x370 net/bluetooth/hci_conn.c:1289
 hci_abort_conn_sync+0x758/0xb50 net/bluetooth/hci_sync.c:5356
 abort_conn_sync+0x187/0x390 net/bluetooth/hci_conn.c:2988
 hci_cmd_sync_work+0x1a4/0x410 net/bluetooth/hci_sync.c:306
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2787
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/0:1/9:
3 locks held by kworker/1:0/23:
1 lock held by khungtaskd/29:
 #0: ffffffff8d1acba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8d1acba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8d1acba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
2 locks held by kswapd0/87:
2 locks held by kswapd1/88:
3 locks held by kworker/1:2/925:
2 locks held by syslogd/4496:
 #0: ffff8880b993ccd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
 #1: ffff8880b9928a08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:988
2 locks held by getty/4812:
 #0: ffff88802908b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
2 locks held by kworker/0:0/5077:
1 lock held by sshd/5100:
2 locks held by kworker/1:1/5116:
5 locks held by kworker/u5:3/5119:
 #0: ffff88801d8b3938 ((wq_completion)hci5){+.+.}-{0:0}, at: process_one_work+0x789/0x15d0 kernel/workqueue.c:2608
 #1: ffffc900046efd80 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x7eb/0x15d0 kernel/workqueue.c:2609
 #2: ffff888021019060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x170/0x410 net/bluetooth/hci_sync.c:305
 #3: ffff888021018078 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x150/0xb50 net/bluetooth/hci_sync.c:5337
 #4: ffffffff8ef22548 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1983 [inline]
 #4: ffffffff8ef22548 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x158/0x370 net/bluetooth/hci_conn.c:1289

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/01/23 23:28 upstream 7ed2632ec7d7 1e153dc8 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hci_conn_failed
* Struck through repros no longer work on HEAD.