[v6.6] INFO: task hung in hci_conn_failed
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syzbot
May 18, 2026, 9:18:33 PM (2 days ago) May 18
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: eac8889a3a1c Linux 6.6.140
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=101714ec580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5b35c4db8465904
dashboard link: https://syzkaller.appspot.com/bug?extid=1709a4b33bbc11702663
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fb5539a09d8e/disk-eac8889a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9b3a1bf56c30/vmlinux-eac8889a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/260b151a96c7/bzImage-eac8889a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1709a4...@syzkaller.appspotmail.com
INFO: task kworker/u5:2:5776 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:2 state:D stack:25928 pid:5776 ppid:2 flags:0x00004000
Workqueue: hci3 hci_cmd_sync_work
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
hci_conn_failed+0x165/0x300 net/bluetooth/hci_conn.c:1252
hci_abort_conn_sync+0xcbe/0xec0 net/bluetooth/hci_sync.c:5692
hci_cmd_sync_work+0x20c/0x380 net/bluetooth/hci_sync.c:333
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
INFO: task syz.2.788:8155 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.788 state:D stack:24232 pid:8155 ppid:5778 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
perf_event_ctx_lock_nested+0x3b9/0x490 kernel/events/core.c:1309
perf_event_ctx_lock kernel/events/core.c:1322 [inline]
perf_event_release_kernel+0x1a0/0x8d0 kernel/events/core.c:5405
perf_release+0x3b/0x40 kernel/events/core.c:5513
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f802c99ce59
RSP: 002b:00007ffe0ef4e4f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f802cc17da0 RCX: 00007f802c99ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f802cc17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f802cc17cb0 R11: 0000000000000246 R12: 000000000003261a
R13: 00007f802cc1636c R14: 00000000000324c5 R15: 00007f802cc16360
</TASK>
Showing all locks held in the system:
2 locks held by kworker/0:1/9:
#0: ffff888017c72538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c72538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900000e7d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900000e7d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
1 lock held by rcu_tasks_trace/15:
#0: ffffffff8d132e90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0xadb/0xdb0 kernel/rcu/tasks.h:607
1 lock held by khungtaskd/29:
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
3 locks held by kworker/u4:3/49:
#0: ffff88802cc66938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88802cc66938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc90000ba7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc90000ba7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4718
3 locks held by kworker/0:2/787:
#0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900039c7d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900039c7d00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104
4 locks held by kworker/u4:6/1092:
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900044cfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900044cfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:286
#3: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#3: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3da/0x880 kernel/rcu/tree_exp.h:1004
3 locks held by kworker/u4:7/1143:
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046afd00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046afd00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#2: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3da/0x880 kernel/rcu/tree_exp.h:1004
6 locks held by kworker/u5:1/5082:
#0: ffff888020ef8138 ((wq_completion)hci1){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888020ef8138 ((wq_completion)hci1){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900104efd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900104efd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888030458e70 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1d4/0x380 net/bluetooth/hci_sync.c:332
#3: ffff8880304580b8 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x98a/0xec0 net/bluetooth/hci_sync.c:5673
#4: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#4: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x165/0x300 net/bluetooth/hci_conn.c:1252
#5: ffff88802d06ab38 (&conn->lock#2){+.+.}-{3:3}, at: l2cap_conn_del+0x70/0x660 net/bluetooth/l2cap_core.c:1759
2 locks held by getty/5525:
#0: ffff8880319aa0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
3 locks held by kworker/1:2/5762:
#0: ffff888017c71d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900045cfd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900045cfd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x92/0xd90 net/wireless/reg.c:2463
5 locks held by kworker/u5:2/5776:
#0: ffff888025a69138 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888025a69138 ((wq_completion)hci3){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046cfd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046cfd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff8880306fce70 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1d4/0x380 net/bluetooth/hci_sync.c:332
#3: ffff8880306fc0b8 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x98a/0xec0 net/bluetooth/hci_sync.c:5673
#4: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#4: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x165/0x300 net/bluetooth/hci_conn.c:1252
4 locks held by kworker/u5:3/5781:
#0: ffff888023d3e538 ((wq_completion)hci4#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888023d3e538 ((wq_completion)hci4#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046efd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046efd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff88807c1540b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
4 locks held by kworker/u5:4/5782:
#0: ffff8880264ac938 ((wq_completion)hci2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff8880264ac938 ((wq_completion)hci2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046ffd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046ffd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff88807a480e70 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1d4/0x380 net/bluetooth/hci_sync.c:332
#3: ffff88807a4800b8 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x98a/0xec0 net/bluetooth/hci_sync.c:5673
4 locks held by kworker/u5:5/5784:
#0: ffff888027619d38 ((wq_completion)hci9#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888027619d38 ((wq_completion)hci9#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000471fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000471fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888043cb00b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
4 locks held by kworker/u5:6/5786:
#0: ffff88805c969538 ((wq_completion)hci5#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88805c969538 ((wq_completion)hci5#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000473fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000473fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff88803045c0b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
3 locks held by kworker/u4:14/7327:
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000c817d00 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000c817d00 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8d137a00 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:4089
1 lock held by syz.2.788/8155:
#0: ffff88805c0b48a8 (&ctx->mutex){+.+.}-{3:3}, at: perf_event_ctx_lock_nested+0x3b9/0x490 kernel/events/core.c:1309
4 locks held by syz.2.788/8156:
1 lock held by syz-executor/8183:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
1 lock held by dhcpcd/8196:
#0: ffff88807873e220 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#0: ffff88807873e220 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline]
#0: ffff88807873e220 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x9b/0x230 net/socket.c:1420
1 lock held by dhcpcd/8197:
#0: ffff88805da94420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#0: ffff88805da94420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline]
#0: ffff88805da94420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x9b/0x230 net/socket.c:1420
1 lock held by syz-executor/8200:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:7/8202:
#0: ffff88801ef6a538 ((wq_completion)hci6#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88801ef6a538 ((wq_completion)hci6#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000be97d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000be97d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff88807adac0b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by syz-executor/8203:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:8/8205:
#0: ffff888027591138 ((wq_completion)hci7#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888027591138 ((wq_completion)hci7#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000beb7d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000beb7d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff8880278d00b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by syz-executor/8206:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:9/8207:
#0: ffff888018b68938 ((wq_completion)hci8#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888018b68938 ((wq_completion)hci8#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000bea7d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000bea7d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888076ab00b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by dhcpcd/8211:
#0: ffff888044aca130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline]
#0: ffff888044aca130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcc0 net/packet/af_packet.c:3264
1 lock held by syz-executor/8212:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
1 lock held by syz-executor/8219:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:10/8220:
#0: ffff888020ed6d38 ((wq_completion)hci10#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888020ed6d38 ((wq_completion)hci10#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000bf3fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000bf3fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888043cb40b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by syz-executor/8222:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:11/8223:
#0: ffff88802f09c538 ((wq_completion)hci11#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88802f09c538 ((wq_completion)hci11#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000bf6fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000bf6fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888043e780b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by syz-executor/8225:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
1 lock held by dhcpcd/8228:
#0: ffff888043f3a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline]
#0: ffff888043f3a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcc0 net/packet/af_packet.c:3264
1 lock held by dhcpcd/8229:
#0: ffff88801cf66130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline]
#0: ffff88801cf66130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcc0 net/packet/af_packet.c:3264
1 lock held by dhcpcd/8230:
#0: ffff8880501c2130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline]
#0: ffff8880501c2130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcc0 net/packet/af_packet.c:3264
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf3d/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8156 Comm: syz.2.788 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:debug_object_activate+0x2e5/0x4f0 lib/debugobjects.c:724
Code: e8 03 42 80 3c 30 00 74 08 4c 89 ff e8 54 fe ad fd 49 8b 07 48 85 c0 74 35 48 8b 7c 24 08 ff d0 49 89 c7 eb 2c 43 0f b6 04 37 <84> c0 0f 85 d1 01 00 00 41 c7 04 24 03 00 00 00 48 8b 7c 24 20 48
RSP: 0018:ffffc900001f0328 EFLAGS: 00000097
RAX: 0000000000000000 RBX: ffff888077d799c8 RCX: 0000000000000001
RDX: ffffffff9750e300 RSI: 0000000000000004 RDI: ffffc900001f0200
RBP: ffff88805e864718 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003e040 R12: ffff88805e864710
R13: ffff88805e864700 R14: dffffc0000000000 R15: 1ffff1100bd0c8e2
FS: 00007f802d8536c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556f499624b0 CR3: 000000005cc12000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
debug_hrtimer_activate kernel/time/hrtimer.c:450 [inline]
debug_activate kernel/time/hrtimer.c:505 [inline]
enqueue_hrtimer+0x30/0x370 kernel/time/hrtimer.c:1108
__run_hrtimer kernel/time/hrtimer.c:1767 [inline]
__hrtimer_run_queues+0x63a/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:nf_hook_slow+0x4b/0x200 net/netfilter/core.c:625
Code: 00 00 00 00 00 fc ff df e8 12 aa cc f8 48 89 d8 48 c1 e8 03 48 89 44 24 10 42 0f b6 04 30 84 c0 0f 85 93 01 00 00 44 0f b7 33 <89> ef 44 89 f6 e8 6b ab cc f8 44 39 f5 0f 83 09 01 00 00 41 89 ec
RSP: 0018:ffffc900001f0730 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88802e997d00 RCX: ffff88807ef11e00
RDX: 0000000000000100 RSI: ffffc900001f07e0 RDI: ffff888023f00640
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff2238ea0
R10: dffffc0000000000 R11: fffffbfff2238ea1 R12: 1ffff9200003e0f8
R13: ffffffff8938ea30 R14: 0000000000000004 R15: ffffc900001f07e0
nf_hook+0x228/0x390 include/linux/netfilter.h:259
NF_HOOK_COND include/linux/netfilter.h:292 [inline]
ip6_output+0x272/0x3b0 net/ipv6/ip6_output.c:240
dst_output include/net/dst.h:467 [inline]
NF_HOOK include/linux/netfilter.h:304 [inline]
ndisc_send_skb+0xc26/0x14f0 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x542/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:css_tryget include/linux/cgroup_refcnt.h:44 [inline]
RIP: 0010:get_mem_cgroup_from_objcg+0xa4/0x150 include/linux/memcontrol.h:533
Code: 81 ff 49 bd 00 00 00 00 00 fc ff df 49 83 c6 10 4c 89 f5 48 c1 ed 03 42 80 7c 2d 00 00 74 08 4c 89 f7 e8 5f 23 f8 ff 4d 8b 3e <4d> 8d 67 54 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 75 16 41 f6
RSP: 0018:ffffc9000ba67610 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff81e73f09 RCX: 90846f8c47b24c00
RDX: 0000000000000000 RSI: ffffffff8b1c9840 RDI: ffffffff8b1c9800
RBP: 1ffff110298901c2 R08: dffffc0000000000 R09: 1ffffffff2238ea0
R10: dffffc0000000000 R11: fffffbfff2238ea1 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88814c480e10 R15: ffff88805bb0c000
obj_cgroup_uncharge_pages mm/memcontrol.c:3114 [inline]
__memcg_kmem_uncharge_page+0xd3/0x280 mm/memcontrol.c:3190
free_pages_prepare mm/page_alloc.c:1171 [inline]
free_unref_page_prepare+0x158/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
mm_free_pgd kernel/fork.c:811 [inline]
__mmdrop+0xb4/0x3d0 kernel/fork.c:927
mmdrop include/linux/sched/mm.h:54 [inline]
mmdrop_sched include/linux/sched/mm.h:82 [inline]
mmdrop_lazy_tlb_sched include/linux/sched/mm.h:109 [inline]
finish_task_switch+0x3dc/0x8f0 kernel/sched/core.c:5280
context_switch kernel/sched/core.c:5384 [inline]
__schedule+0x155b/0x45a0 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652
task_function_call kernel/events/core.c:120 [inline]
perf_install_in_context+0x5be/0x920 kernel/events/core.c:2959
__do_sys_perf_event_open kernel/events/core.c:12957 [inline]
__se_sys_perf_event_open+0x1836/0x1c50 kernel/events/core.c:12609
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f802c99ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f802d853028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f802cc15fa0 RCX: 00007f802c99ce59
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000080
RBP: 00007f802ca32d6f R08: 000000000000000a R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f802cc16038 R14: 00007f802cc15fa0 R15: 00007ffe0ef4e398
</TASK>
---
This report is generated by a bot. It may contain errors.
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syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: eac8889a3a1c Linux 6.6.140
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=101714ec580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5b35c4db8465904
dashboard link: https://syzkaller.appspot.com/bug?extid=1709a4b33bbc11702663
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fb5539a09d8e/disk-eac8889a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9b3a1bf56c30/vmlinux-eac8889a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/260b151a96c7/bzImage-eac8889a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1709a4...@syzkaller.appspotmail.com
INFO: task kworker/u5:2:5776 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u5:2 state:D stack:25928 pid:5776 ppid:2 flags:0x00004000
Workqueue: hci3 hci_cmd_sync_work
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
hci_conn_failed+0x165/0x300 net/bluetooth/hci_conn.c:1252
hci_abort_conn_sync+0xcbe/0xec0 net/bluetooth/hci_sync.c:5692
hci_cmd_sync_work+0x20c/0x380 net/bluetooth/hci_sync.c:333
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
INFO: task syz.2.788:8155 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.788 state:D stack:24232 pid:8155 ppid:5778 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
perf_event_ctx_lock_nested+0x3b9/0x490 kernel/events/core.c:1309
perf_event_ctx_lock kernel/events/core.c:1322 [inline]
perf_event_release_kernel+0x1a0/0x8d0 kernel/events/core.c:5405
perf_release+0x3b/0x40 kernel/events/core.c:5513
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f802c99ce59
RSP: 002b:00007ffe0ef4e4f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f802cc17da0 RCX: 00007f802c99ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f802cc17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f802cc17cb0 R11: 0000000000000246 R12: 000000000003261a
R13: 00007f802cc1636c R14: 00000000000324c5 R15: 00007f802cc16360
</TASK>
Showing all locks held in the system:
2 locks held by kworker/0:1/9:
#0: ffff888017c72538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c72538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900000e7d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900000e7d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
1 lock held by rcu_tasks_trace/15:
#0: ffffffff8d132e90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0xadb/0xdb0 kernel/rcu/tasks.h:607
1 lock held by khungtaskd/29:
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
3 locks held by kworker/u4:3/49:
#0: ffff88802cc66938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88802cc66938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc90000ba7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc90000ba7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4718
3 locks held by kworker/0:2/787:
#0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900039c7d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900039c7d00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104
4 locks held by kworker/u4:6/1092:
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900044cfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900044cfd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:286
#3: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#3: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3da/0x880 kernel/rcu/tree_exp.h:1004
3 locks held by kworker/u4:7/1143:
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046afd00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046afd00 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#2: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3da/0x880 kernel/rcu/tree_exp.h:1004
6 locks held by kworker/u5:1/5082:
#0: ffff888020ef8138 ((wq_completion)hci1){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888020ef8138 ((wq_completion)hci1){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900104efd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900104efd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888030458e70 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1d4/0x380 net/bluetooth/hci_sync.c:332
#3: ffff8880304580b8 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x98a/0xec0 net/bluetooth/hci_sync.c:5673
#4: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#4: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x165/0x300 net/bluetooth/hci_conn.c:1252
#5: ffff88802d06ab38 (&conn->lock#2){+.+.}-{3:3}, at: l2cap_conn_del+0x70/0x660 net/bluetooth/l2cap_core.c:1759
2 locks held by getty/5525:
#0: ffff8880319aa0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
3 locks held by kworker/1:2/5762:
#0: ffff888017c71d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71d38 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900045cfd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900045cfd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x92/0xd90 net/wireless/reg.c:2463
5 locks held by kworker/u5:2/5776:
#0: ffff888025a69138 ((wq_completion)hci3){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888025a69138 ((wq_completion)hci3){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046cfd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046cfd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff8880306fce70 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1d4/0x380 net/bluetooth/hci_sync.c:332
#3: ffff8880306fc0b8 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x98a/0xec0 net/bluetooth/hci_sync.c:5673
#4: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#4: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_failed+0x165/0x300 net/bluetooth/hci_conn.c:1252
4 locks held by kworker/u5:3/5781:
#0: ffff888023d3e538 ((wq_completion)hci4#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888023d3e538 ((wq_completion)hci4#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046efd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046efd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff88807c1540b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
4 locks held by kworker/u5:4/5782:
#0: ffff8880264ac938 ((wq_completion)hci2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff8880264ac938 ((wq_completion)hci2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900046ffd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900046ffd00 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff88807a480e70 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1d4/0x380 net/bluetooth/hci_sync.c:332
#3: ffff88807a4800b8 (&hdev->lock){+.+.}-{3:3}, at: hci_abort_conn_sync+0x98a/0xec0 net/bluetooth/hci_sync.c:5673
4 locks held by kworker/u5:5/5784:
#0: ffff888027619d38 ((wq_completion)hci9#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888027619d38 ((wq_completion)hci9#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000471fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000471fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888043cb00b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
4 locks held by kworker/u5:6/5786:
#0: ffff88805c969538 ((wq_completion)hci5#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88805c969538 ((wq_completion)hci5#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000473fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000473fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff88803045c0b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
3 locks held by kworker/u4:14/7327:
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888017c71538 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000c817d00 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000c817d00 ((work_completion)(©->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffffffff8d137a00 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:4089
1 lock held by syz.2.788/8155:
#0: ffff88805c0b48a8 (&ctx->mutex){+.+.}-{3:3}, at: perf_event_ctx_lock_nested+0x3b9/0x490 kernel/events/core.c:1309
4 locks held by syz.2.788/8156:
1 lock held by syz-executor/8183:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
1 lock held by dhcpcd/8196:
#0: ffff88807873e220 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#0: ffff88807873e220 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline]
#0: ffff88807873e220 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x9b/0x230 net/socket.c:1420
1 lock held by dhcpcd/8197:
#0: ffff88805da94420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#0: ffff88805da94420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: __sock_release net/socket.c:658 [inline]
#0: ffff88805da94420 (&sb->s_type->i_mutex_key#11){+.+.}-{3:3}, at: sock_close+0x9b/0x230 net/socket.c:1420
1 lock held by syz-executor/8200:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:7/8202:
#0: ffff88801ef6a538 ((wq_completion)hci6#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88801ef6a538 ((wq_completion)hci6#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000be97d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000be97d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff88807adac0b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by syz-executor/8203:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:8/8205:
#0: ffff888027591138 ((wq_completion)hci7#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888027591138 ((wq_completion)hci7#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000beb7d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000beb7d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff8880278d00b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by syz-executor/8206:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:9/8207:
#0: ffff888018b68938 ((wq_completion)hci8#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888018b68938 ((wq_completion)hci8#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000bea7d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000bea7d00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888076ab00b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by dhcpcd/8211:
#0: ffff888044aca130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline]
#0: ffff888044aca130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcc0 net/packet/af_packet.c:3264
1 lock held by syz-executor/8212:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
1 lock held by syz-executor/8219:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:10/8220:
#0: ffff888020ed6d38 ((wq_completion)hci10#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888020ed6d38 ((wq_completion)hci10#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000bf3fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000bf3fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888043cb40b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by syz-executor/8222:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
4 locks held by kworker/u5:11/8223:
#0: ffff88802f09c538 ((wq_completion)hci11#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff88802f09c538 ((wq_completion)hci11#2){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000bf6fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000bf6fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888043e780b8 (&hdev->lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x9c/0x900 net/bluetooth/hci_event.c:3688
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1996 [inline]
#3: ffffffff8e531828 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x547/0x900 net/bluetooth/hci_event.c:3722
1 lock held by syz-executor/8225:
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3c3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x811/0xfa0 net/core/rtnetlink.c:6473
1 lock held by dhcpcd/8228:
#0: ffff888043f3a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline]
#0: ffff888043f3a130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcc0 net/packet/af_packet.c:3264
1 lock held by dhcpcd/8229:
#0: ffff88801cf66130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline]
#0: ffff88801cf66130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcc0 net/packet/af_packet.c:3264
1 lock held by dhcpcd/8230:
#0: ffff8880501c2130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline]
#0: ffff8880501c2130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcc0 net/packet/af_packet.c:3264
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf3d/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8156 Comm: syz.2.788 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:debug_object_activate+0x2e5/0x4f0 lib/debugobjects.c:724
Code: e8 03 42 80 3c 30 00 74 08 4c 89 ff e8 54 fe ad fd 49 8b 07 48 85 c0 74 35 48 8b 7c 24 08 ff d0 49 89 c7 eb 2c 43 0f b6 04 37 <84> c0 0f 85 d1 01 00 00 41 c7 04 24 03 00 00 00 48 8b 7c 24 20 48
RSP: 0018:ffffc900001f0328 EFLAGS: 00000097
RAX: 0000000000000000 RBX: ffff888077d799c8 RCX: 0000000000000001
RDX: ffffffff9750e300 RSI: 0000000000000004 RDI: ffffc900001f0200
RBP: ffff88805e864718 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003e040 R12: ffff88805e864710
R13: ffff88805e864700 R14: dffffc0000000000 R15: 1ffff1100bd0c8e2
FS: 00007f802d8536c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556f499624b0 CR3: 000000005cc12000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
debug_hrtimer_activate kernel/time/hrtimer.c:450 [inline]
debug_activate kernel/time/hrtimer.c:505 [inline]
enqueue_hrtimer+0x30/0x370 kernel/time/hrtimer.c:1108
__run_hrtimer kernel/time/hrtimer.c:1767 [inline]
__hrtimer_run_queues+0x63a/0xc40 kernel/time/hrtimer.c:1814
hrtimer_interrupt+0x3c9/0x9c0 kernel/time/hrtimer.c:1876
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1077 [inline]
__sysvec_apic_timer_interrupt+0xfb/0x3b0 arch/x86/kernel/apic/apic.c:1094
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0x51/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:nf_hook_slow+0x4b/0x200 net/netfilter/core.c:625
Code: 00 00 00 00 00 fc ff df e8 12 aa cc f8 48 89 d8 48 c1 e8 03 48 89 44 24 10 42 0f b6 04 30 84 c0 0f 85 93 01 00 00 44 0f b7 33 <89> ef 44 89 f6 e8 6b ab cc f8 44 39 f5 0f 83 09 01 00 00 41 89 ec
RSP: 0018:ffffc900001f0730 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88802e997d00 RCX: ffff88807ef11e00
RDX: 0000000000000100 RSI: ffffc900001f07e0 RDI: ffff888023f00640
RBP: 0000000000000000 R08: dffffc0000000000 R09: 1ffffffff2238ea0
R10: dffffc0000000000 R11: fffffbfff2238ea1 R12: 1ffff9200003e0f8
R13: ffffffff8938ea30 R14: 0000000000000004 R15: ffffc900001f07e0
nf_hook+0x228/0x390 include/linux/netfilter.h:259
NF_HOOK_COND include/linux/netfilter.h:292 [inline]
ip6_output+0x272/0x3b0 net/ipv6/ip6_output.c:240
dst_output include/net/dst.h:467 [inline]
NF_HOOK include/linux/netfilter.h:304 [inline]
ndisc_send_skb+0xc26/0x14f0 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x542/0x800 kernel/time/timer.c:2023
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:css_tryget include/linux/cgroup_refcnt.h:44 [inline]
RIP: 0010:get_mem_cgroup_from_objcg+0xa4/0x150 include/linux/memcontrol.h:533
Code: 81 ff 49 bd 00 00 00 00 00 fc ff df 49 83 c6 10 4c 89 f5 48 c1 ed 03 42 80 7c 2d 00 00 74 08 4c 89 f7 e8 5f 23 f8 ff 4d 8b 3e <4d> 8d 67 54 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 84 c0 75 16 41 f6
RSP: 0018:ffffc9000ba67610 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff81e73f09 RCX: 90846f8c47b24c00
RDX: 0000000000000000 RSI: ffffffff8b1c9840 RDI: ffffffff8b1c9800
RBP: 1ffff110298901c2 R08: dffffc0000000000 R09: 1ffffffff2238ea0
R10: dffffc0000000000 R11: fffffbfff2238ea1 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88814c480e10 R15: ffff88805bb0c000
obj_cgroup_uncharge_pages mm/memcontrol.c:3114 [inline]
__memcg_kmem_uncharge_page+0xd3/0x280 mm/memcontrol.c:3190
free_pages_prepare mm/page_alloc.c:1171 [inline]
free_unref_page_prepare+0x158/0x8c0 mm/page_alloc.c:2365
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
mm_free_pgd kernel/fork.c:811 [inline]
__mmdrop+0xb4/0x3d0 kernel/fork.c:927
mmdrop include/linux/sched/mm.h:54 [inline]
mmdrop_sched include/linux/sched/mm.h:82 [inline]
mmdrop_lazy_tlb_sched include/linux/sched/mm.h:109 [inline]
finish_task_switch+0x3dc/0x8f0 kernel/sched/core.c:5280
context_switch kernel/sched/core.c:5384 [inline]
__schedule+0x155b/0x45a0 kernel/sched/core.c:6700
preempt_schedule_common+0x82/0xc0 kernel/sched/core.c:6867
preempt_schedule+0xc0/0xd0 kernel/sched/core.c:6891
preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
smp_call_function_single+0x48d/0x5a0 kernel/smp.c:652
task_function_call kernel/events/core.c:120 [inline]
perf_install_in_context+0x5be/0x920 kernel/events/core.c:2959
__do_sys_perf_event_open kernel/events/core.c:12957 [inline]
__se_sys_perf_event_open+0x1836/0x1c50 kernel/events/core.c:12609
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f802c99ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f802d853028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f802cc15fa0 RCX: 00007f802c99ce59
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000080
RBP: 00007f802ca32d6f R08: 000000000000000a R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f802cc16038 R14: 00007f802cc15fa0 R15: 00007ffe0ef4e398
</TASK>
---
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