INFO: task syz.1.2:5932 blocked for more than 143 seconds. Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.2 state:D stack:22496 pid:5932 tgid:5929 ppid:5831 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6690 __schedule_loop kernel/sched/core.c:6767 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6782 xfs_ail_push_all_sync+0x236/0x310 fs/xfs/xfs_trans_ail.c:726 xfs_log_quiesce+0xdf/0x5b0 fs/xfs/xfs_log.c:1018 xfs_log_clean+0xa4/0xc40 fs/xfs/xfs_log.c:1030 xfs_remount_ro fs/xfs/xfs_super.c:1922 [inline] xfs_fs_reconfigure+0x7b1/0x930 fs/xfs/xfs_super.c:1978 reconfigure_super+0x445/0x880 fs/super.c:1083 do_remount fs/namespace.c:3047 [inline] path_mount+0xc22/0xfa0 fs/namespace.c:3826 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 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: 0033:0x7ffa77b7feba RSP: 002b:00007ffa788f3e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffa788f3ef0 RCX: 00007ffa77b7feba RDX: 0000000020000f40 RSI: 0000000020000f00 RDI: 0000000000000000 RBP: 0000000020000f40 R08: 00007ffa788f3ef0 R09: 0000000001a4a421 R10: 0000000001a4a421 R11: 0000000000000246 R12: 0000000020000f00 R13: 00007ffa788f3eb0 R14: 0000000000000000 R15: 00000000200008c0 Showing all locks held in the system: 5 locks held by kworker/u8:0/11: #0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000107d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000107d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcb48d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:580 #3: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: wg_destruct+0x25/0x2e0 drivers/net/wireguard/device.c:246 #4: ffff8880b863ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598 1 lock held by khungtaskd/30: #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720 4 locks held by kworker/u8:7/2939: #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc9000b60fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000b60fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 #3: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #3: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976 2 locks held by getty/5595: #0: ffff88814ea380a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by syz.1.2/5932: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: do_remount fs/namespace.c:3044 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: path_mount+0xbdb/0xfa0 fs/namespace.c:3826 1 lock held by syz.7.139/7078: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7079: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7080: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7081: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7083: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7085: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7087: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7091: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7092: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7097: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7098: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz.7.139/7099: #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805a3180e0 (&type->s_umount_key#50){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 3 locks held by kworker/1:6/7952: #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc9000c26fd00 (free_ipc_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000c26fd00 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #2: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976 2 locks held by syz-executor/8773: #0: ffffffff8fcb48d0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:490 #1: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: ip_tunnel_init_net+0x20e/0x720 net/ipv4/ip_tunnel.c:1159 3 locks held by syz.1.344/8831: #0: ffff88805e2b8d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:481 [inline] #0: ffff88805e2b8d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2698 #1: ffff88805e2b8078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x5c8/0x11c0 net/bluetooth/hci_sync.c:5193 #2: ffffffff8fe2dd68 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1972 [inline] #2: ffffffff8fe2dd68 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa6/0x240 net/bluetooth/hci_conn.c:2592 3 locks held by syz.8.345/8834: #0: ffff888061f94d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:481 [inline] #0: ffff888061f94d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2698 #1: ffff888061f94078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x5c8/0x11c0 net/bluetooth/hci_sync.c:5193 #2: ffffffff8fe2dd68 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1972 [inline] #2: ffffffff8fe2dd68 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa6/0x240 net/bluetooth/hci_conn.c:2592 2 locks held by sed/8871: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3604 Comm: kworker/u8:12 Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: bat_events batadv_nc_worker RIP: 0010:match_held_lock+0x2/0xb0 kernel/locking/lockdep.c:5270 Code: c4 10 5b 41 5e 41 5f c3 cc cc cc cc e8 07 f9 ff ff 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 53 01 00 00 00 48 39 77 10 74 67 48 89 fb 81 7f 20 00 00 20 00 72 RSP: 0018:ffffc9000c35f988 EFLAGS: 00000087 RAX: 0000000000000003 RBX: 0000000000000002 RCX: ffffc9000c35fa03 RDX: 1ffff9200186bf44 RSI: ffffffff8e937da0 RDI: ffff888031f9c730 RBP: ffffc9000c35fad8 R08: ffffffff901bdd6f R09: 1ffffffff2037bad R10: dffffc0000000000 R11: fffffbfff2037bae R12: 000000000000000a R13: 0000000000000002 R14: ffff888031f9c730 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000558975298950 CR3: 000000000e734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: find_held_lock kernel/locking/lockdep.c:5315 [inline] __lock_release kernel/locking/lockdep.c:5500 [inline] lock_release+0x285/0xa30 kernel/locking/lockdep.c:5846 rcu_lock_release include/linux/rcupdate.h:347 [inline] rcu_read_unlock include/linux/rcupdate.h:880 [inline] batadv_nc_process_nc_paths+0x2f0/0x3a0 net/batman-adv/network-coding.c:699 batadv_nc_worker+0x52c/0x610 net/batman-adv/network-coding.c:735 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244