INFO: task kworker/u8:13:9849 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:13   state:D stack:19760 pid:9849  tgid:9849  ppid:2      flags:0x00004000
Workqueue: netns cleanup_net

Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 cangw_pernet_exit_batch+0x20/0x90 net/can/gw.c:1257
 ops_exit_list net/core/net_namespace.c:178 [inline]
 cleanup_net+0x89f/0xcc0 net/core/net_namespace.c:640
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3329
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task syz-executor:19416 blocked for more than 144 seconds.
      Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20288 pid:19416 tgid:19416 ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline]
 synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:939
 namespace_unlock+0x29f/0x4d0 fs/namespace.c:1573
 do_umount fs/namespace.c:1801 [inline]
 path_umount+0xeca/0xf70 fs/namespace.c:1896
 ksys_umount fs/namespace.c:1919 [inline]
 __do_sys_umount fs/namespace.c:1924 [inline]
 __se_sys_umount fs/namespace.c:1922 [inline]
 __x64_sys_umount+0x126/0x170 fs/namespace.c:1922
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9bc1776f07
RSP: 002b:00007ffe2f078558 EFLAGS: 00000246
 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9bc1776f07
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe2f078610
RBP: 00007ffe2f078610 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe2f0796e0
R13: 00007f9bc17e3515 R14: 00000000001006af R15: 0000000000000009
 </TASK>
INFO: task syz-executor:19782 blocked for more than 145 seconds.
      Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D
 stack:21024 pid:19782 tgid:19782 ppid:1      flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 rtnl_lock net/core/rtnetlink.c:79 [inline]
 rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632
 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2564
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8db/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x223/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2192
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbe31f7796c
RSP: 002b:00007ffce8d97e20 EFLAGS: 00000293
 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fbe32c34620 RCX: 00007fbe31f7796c
RDX: 0000000000000028 RSI: 00007fbe32c34670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffce8d97e74 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fbe32c34670 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:19811 blocked for more than 147 seconds.
      Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21024 pid:19811 tgid:19811 ppid:1      flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 rtnl_lock net/core/rtnetlink.c:79 [inline]
 rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632
 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2564
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8db/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x223/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2192
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f27beb7796c
RSP: 002b:00007ffde0b09190 EFLAGS: 00000293
 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f27bf834620 RCX: 00007f27beb7796c
RDX: 000000000000003c RSI: 00007f27bf834670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffde0b091e4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f27bf834670 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:19854 blocked for more than 149 seconds.
      Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24464 pid:19854 tgid:19854 ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 __tun_chr_ioctl+0x48f/0x2400 drivers/net/tun.c:3110
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfe/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd7e99757db
RSP: 002b:00007fffca563400 EFLAGS: 00000246
 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd7e9b03f20 RCX: 00007fd7e99757db
RDX: 00007fffca563480 RSI: 00000000400454ca RDI: 00000000000000c8
RBP: 00007fd7e9b04a18 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000000c
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009
 </TASK>
INFO: task syz-executor:19881 blocked for more than 150 seconds.
      Not tainted 6.10.0-rc6-syzkaller-00069-g795c58e4c7fc #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D
 stack:24992 pid:19881 tgid:19881 ppid:1      flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 rtnl_lock net/core/rtnetlink.c:79 [inline]
 rtnetlink_rcv_msg+0x842/0x1180 net/core/rtnetlink.c:6632
 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2564
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8db/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x223/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2192
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f27e0d7796c
RSP: 002b:00007fff4a2772f0 EFLAGS: 00000293
 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f27e1a34620 RCX: 00007f27e0d7796c
RDX: 0000000000000028 RSI: 00007f27e1a34670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fff4a277344 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f27e1a34670 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: 
ffffffff8e333f20
 (
rcu_read_lock
){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u8:6/962:
 #0: 
ffff88802a219948
 (
(wq_completion)ipv6_addrconf){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3223 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: 
ffffc90004047d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
ffffc90004047d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: 
ffffffff8f5e6ec8
 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4733
2 locks held by getty/4854:
 #0: 
ffff88802a8a60a0
 (&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: 
ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}
, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211
4 locks held by kworker/u9:4/5101:
 #0: ffff88801830f948 ((wq_completion)hci11#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3223 [inline]
 #0: ffff88801830f948 ((wq_completion)hci11#2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329
 #1: ffffc9000314fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3224 [inline]
 #1: ffffc9000314fd00 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3329
 #2: 
ffff88806eca4078
 (
&hdev->lock
){+.+.}-{3:3}, at: hci_remote_features_evt+0x97/0xaf0 net/bluetooth/hci_event.c:3687
 #3: ffffffff8f7515c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1967 [inline]
 #3: ffffffff8f7515c8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_remote_features_evt+0x4c3/0xaf0 net/bluetooth/hci_event.c:3721
5 locks held by kworker/u9:5/5104:
 #0: 
ffff88806a7a6148
 (
(wq_completion)hci0
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3223 [inline]
, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3329