INFO: task syz-executor:5835 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:23752 pid:5835 tgid:5835 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760
nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
nfsd_umount+0x48/0xe0 fs/nfsd/nfsctl.c:1347
deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
deactivate_super fs/super.c:506 [inline]
deactivate_super+0xde/0x100 fs/super.c:502
cleanup_mnt+0x225/0x450 fs/namespace.c:1327
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x419/0x4b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9550d901f7
RSP: 002b:00007ffd30393468 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f9550e11d7d RCX: 00007f9550d901f7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd303945b0
RBP: 00007ffd3039459c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd303945b0
R13: 00007f9550e11d7d R14: 000000000006a52c R15: 00007ffd303945f0
INFO: task syz.2.1477:13361 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.1477 state:D stack:28248 pid:13361 tgid:13352 ppid:5846 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760
nfsd_nl_listener_set_doit+0xd5/0x1b10 fs/nfsd/nfsctl.c:1880
genl_family_rcv_msg_doit+0x206/0x2f0 net/netlink/genetlink.c:1115
genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210
netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:727 [inline]
__sock_sendmsg net/socket.c:742 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2630
___sys_sendmsg+0x134/0x1d0 net/socket.c:2684
__sys_sendmsg+0x16d/0x220 net/socket.c:2716
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff26838eec9
RSP: 002b:00007ff2661f4038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff2685e6270 RCX: 00007ff26838eec9
RDX: 0000000000000000 RSI: 0000200000003700 RDI: 0000000000000003
RBP: 00007ff268411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff2685e6308 R14: 00007ff2685e6270 R15: 00007ffd4cfd9088
Showing all locks held in the system:
3 locks held by kworker/0:0/9:
#0: ffff88801b059948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238
#1: ffffc900000e7d10 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239
#2: ffff88804ace9240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1bb/0x2e80 drivers/net/netdevsim/fib.c:1490
1 lock held by khungtaskd/31:
#0: ffffffff8e1c3fa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e1c3fa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e1c3fa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
2 locks held by syz-executor/5835:
#0: ffff888078b800e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff888078b800e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff888078b800e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff888078b800e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/5836:
#0: ffff888039a9a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff888039a9a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff888039a9a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff888039a9a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/5839:
#0: ffff88805bf240e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88805bf240e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88805bf240e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff88805bf240e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
3 locks held by kworker/1:5/5906:
#0: ffff88801b059948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238
#1: ffffc9000493fd10 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239
#2: ffffffff8e1cf538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:311
3 locks held by kworker/u10:14/9787:
#0: ffff88814cf7a148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238
#1: ffffc90003a3fd10 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239
#2: ffffffff8fee7908 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8fee7908 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x120/0x14e0 net/ipv6/addrconf.c:4194
4 locks held by kworker/u10:27/9833:
#0: ffff88801bede948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238
#1: ffffc90003e5fd10 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239
#2: ffffffff8fed14f0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xad/0x8b0 net/core/net_namespace.c:669
#3: ffffffff8fee7908 (rtnl_mutex){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:173 [inline]
#3: ffffffff8fee7908 (rtnl_mutex){+.+.}-{4:4}, at: ops_undo_list+0x7e9/0xab0 net/core/net_namespace.c:248
2 locks held by syz.2.1477/13356:
#0: ffffffff8ff8b170 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0xd5/0x1b10 fs/nfsd/nfsctl.c:1880
2 locks held by syz.2.1477/13361:
#0: ffffffff8ff8b170 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0xd5/0x1b10 fs/nfsd/nfsctl.c:1880
2 locks held by syz-executor/13557:
#0: ffff888058fc20e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff888058fc20e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff888058fc20e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff888058fc20e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/13607:
#0: ffff888048f2a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff888048f2a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff888048f2a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff888048f2a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/14021:
#0: ffff888032ac00e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff888032ac00e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff888032ac00e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff888032ac00e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/14236:
#0: ffff88802fee20e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88802fee20e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88802fee20e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff88802fee20e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/14599:
#0: ffff8880332700e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff8880332700e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff8880332700e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff8880332700e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/14647:
#0: ffff888079a960e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff888079a960e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff888079a960e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff888079a960e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/15000:
#0: ffff88802f5300e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88802f5300e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88802f5300e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff88802f5300e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/15127:
#0: ffff88802f5ba0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88802f5ba0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88802f5ba0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff88802f5ba0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
5 locks held by syz-executor/15155:
#0: ffff888095880dc8 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:499
#1: ffff8880958800b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ae/0x11d0 net/bluetooth/hci_sync.c:5291
#2: ffffffff901500c8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:2118 [inline]
#2: ffffffff901500c8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xbb/0x260 net/bluetooth/hci_conn.c:2602
#3: ffff888095944b38 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0x80/0x730 net/bluetooth/l2cap_core.c:1762
#4: ffffffff8e1cf538 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:343
2 locks held by syz-executor/15264:
#0: ffff88809d0c00e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88809d0c00e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88809d0c00e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff88809d0c00e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/15359:
#0: ffff8880a51cc0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff8880a51cc0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff8880a51cc0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff8880a51cc0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by syz-executor/15420:
#0: ffff88808c1000e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88808c1000e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88808c1000e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline]
#0: ffff88808c1000e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502
#1: ffffffff8e5eb648 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593
2 locks held by getty/15688:
#0: ffff888030eea0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900037142f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
3 locks held by syz-executor/15713:
#0: ffff88808eb78dc8 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:499
#1: ffff88808eb780b8 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x3ae/0x11d0 net/bluetooth/hci_sync.c:5291
#2: ffffffff901500c8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:2118 [inline]
#2: ffffffff901500c8 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_hash_flush+0xbb/0x260 net/bluetooth/hci_conn.c:2602
3 locks held by syz.8.1932/15729:
#0: ffff8880afd8e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:289 [inline]
#0: ffff8880afd8e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock_pair_timeout drivers/tty/tty_ldisc.c:335 [inline]
#0: ffff8880afd8e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock_pair drivers/tty/tty_ldisc.c:366 [inline]
#0: ffff8880afd8e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_release+0x153/0x2e0 drivers/tty/tty_ldisc.c:780
#1: ffff8880afd8f0a0 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: __tty_ldisc_lock_nested drivers/tty/tty_ldisc.c:295 [inline]
#1: ffff8880afd8f0a0 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_lock_pair_timeout drivers/tty/tty_ldisc.c:337 [inline]
#1: ffff8880afd8f0a0 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_lock_pair drivers/tty/tty_ldisc.c:366 [inline]
#1: ffff8880afd8f0a0 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: tty_ldisc_release+0x17d/0x2e0 drivers/tty/tty_ldisc.c:780
#2: ffffffff8fee7908 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8fee7908 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2142
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0xf3f/0x1170 kernel/hung_task.c:495
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:109 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:151 [inline]
RIP: 0010:lock_is_held_type+0xf2/0x150 kernel/locking/lockdep.c:5942
Code: c0 45 31 ed 44 39 f0 41 0f 94 c5 48 c7 c7 02 df 7f 8d e8 31 14 00 00 b8 ff ff ff ff 65 0f c1 05 ec d2 2f 08 83 f8 01 75 2d 9c <58> f6 c4 02 75 43 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 44
RSP: 0018:ffffc90000007a48 EFLAGS: 00000046
RAX: 0000000000000001 RBX: ffffffff8de98558 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8d7fdf02 RDI: ffffffff8bd04ac0
RBP: ffff888024bf18b0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8de97a00
R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000002
FS: 0000000000000000(0000) GS:ffff888124e7e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c68cc3b138 CR3: 000000007c7ba000 CR4: 00000000003526f0
Call Trace:
lock_is_held include/linux/lockdep.h:249 [inline]
lockdep_rht_mutex_is_held lib/rhashtable.c:49 [inline]
lockdep_rht_mutex_is_held+0x7a/0xa0 lib/rhashtable.c:47
__rhashtable_lookup.isra.0+0x423/0x6c0 include/linux/rhashtable.h:602
rhltable_lookup include/linux/rhashtable.h:696 [inline]
sta_info_hash_lookup net/mac80211/sta_info.c:199 [inline]
sta_info_get_bss+0xb2/0x3a0 net/mac80211/sta_info.c:236
ieee80211_rx_for_interface+0x15a/0x770 net/mac80211/rx.c:5116
__ieee80211_rx_handle_packet net/mac80211/rx.c:5312 [inline]
ieee80211_rx_list+0x10c6/0x2a10 net/mac80211/rx.c:5447
ieee80211_rx_napi+0xdc/0x410 net/mac80211/rx.c:5470
ieee80211_rx include/net/mac80211.h:5214 [inline]
ieee80211_handle_queued_frames+0xd5/0x130 net/mac80211/main.c:453
tasklet_action_common+0x281/0x400 kernel/softirq.c:925
handle_softirqs+0x216/0x8e0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:723
irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: ee 61 02 e9 c3 09 03 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d a3 6c 1f 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8de07e08 EFLAGS: 000002c2
RAX: 00000000005e20fb RBX: 0000000000000000 RCX: ffffffff8b4a9a59
RDX: 0000000000000000 RSI: ffffffff8d823954 RDI: ffffffff8bd04ac0
RBP: fffffbfff1bd2f40 R08: 0000000000000001 R09: ffffed10170c6655
R10: ffff8880b86332ab R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8de97a00 R14: ffffffff905fe890 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:757
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x38d/0x500 kernel/sched/idle.c:330
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
rest_init+0x16b/0x2b0 init/main.c:757
start_kernel+0x3f3/0x4e0 init/main.c:1111
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148