INFO: task syz-executor:9789 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:22384 pid:9789 ppid:1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5246 [inline] __schedule+0x107f/0x4030 kernel/sched/core.c:6563 schedule+0xb9/0x180 kernel/sched/core.c:6639 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6698 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x548/0xae0 kernel/locking/mutex.c:747 lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 jfs_umount+0x288/0x360 fs/jfs/jfs_umount.c:116 jfs_put_super+0x88/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_block_super+0x7c/0xe0 fs/super.c:1470 deactivate_locked_super+0x93/0xf0 fs/super.c:332 cleanup_mnt+0x471/0x4f0 fs/namespace.c:1191 task_work_run+0x1d0/0x260 kernel/task_work.c:203 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:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fec2979f0d7 RSP: 002b:00007ffc09fd9448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fec2983330a RCX: 00007fec2979f0d7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc09fd9500 RBP: 00007ffc09fd9500 R08: 00007ffc09fda500 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc09fda590 R13: 00007fec2983330a R14: 0000000000084aab R15: 00007ffc09fda5d0 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8cb2e4f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffffffff8cb2ed10 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xef0 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6527 2 locks held by getty/4028: #0: ffff88802ff42098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41e/0x1360 drivers/tty/n_tty.c:2198 2 locks held by syz-executor/5827: #0: ffff888075a000e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 3 locks held by kworker/u4:22/5943: #0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267 #1: ffffc900036e7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267 #2: ffffffff8dd5b968 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263 2 locks held by syz-executor/7361: #0: ffff8880781260e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 3 locks held by kworker/0:20/8186: #0: ffff88814c075538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267 #1: ffffc9000623fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267 #2: ffffffff8dd5b968 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1500 net/ipv6/addrconf.c:4138 3 locks held by kworker/1:17/8596: #0: ffff88814c075538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267 #1: ffffc9000d987d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267 #2: ffff888018edd240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x283/0x3320 drivers/net/netdevsim/fib.c:1491 2 locks held by syz-executor/8993: #0: ffff88807b0260e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/9644: #0: ffff8880726d20e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/9789: #0: ffff8880766640e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 3 locks held by kworker/1:19/10012: #0: ffff88814c075538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267 #1: ffffc90004327d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7b4/0x1160 kernel/workqueue.c:2267 #2: ffffffff8dd5b968 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1500 net/ipv6/addrconf.c:4138 2 locks held by syz-executor/10123: #0: ffff88802aa400e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/10916: #0: ffff88804b95a0e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.8.1215/10919: #0: ffff888075a000e0 (&type->s_umount_key#82){++++}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:889 2 locks held by syz-executor/10954: #0: ffff888074c6a0e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.0.1223/10959: #0: ffff8880781260e0 (&type->s_umount_key#82){++++}-{3:3}, at: user_get_super+0xcd/0x240 fs/super.c:887 2 locks held by syz-executor/11116: #0: ffff88806694c0e0 (&type->s_umount_key#82){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffffffff8cf2de08 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xa9/0x530 fs/jfs/jfs_logmgr.c:1444 4 locks held by syz-executor/11297: 1 lock held by syz-executor/11369: #0: ffffffff8dd5b968 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffffffff8dd5b968 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x80d/0xfb0 net/core/rtnetlink.c:6163 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xf0e/0xf50 kernel/hung_task.c:377 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 11297 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:hlock_class kernel/locking/lockdep.c:240 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4753 [inline] RIP: 0010:__lock_acquire+0x938/0x7c40 kernel/locking/lockdep.c:5013 Code: 41 81 e6 ff 1f 00 00 c1 e8 03 25 f8 03 00 00 48 8d b8 40 f2 b0 90 be 08 00 00 00 e8 a2 5a 6f 00 4c 0f a3 35 9a ea 4c 0f 73 1a <4b> 8d 04 76 c1 e0 06 4c 8d b0 00 71 49 90 49 b8 00 00 00 00 00 fc RSP: 0018:ffffc90000006ca0 EFLAGS: 00000057 RAX: 0000000000000001 RBX: 0000000000000003 RCX: ffffffff8164079e RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90b0f240 RBP: ffffc90000006ed0 R08: ffffffff90b0f247 R09: 1ffffffff2161e48 R10: dffffc0000000000 R11: fffffbfff2161e49 R12: ffff88802518c6d8 R13: ffff88802518c778 R14: 000000000000002d R15: ffff88802518c778 FS: 000055558f5ae500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560017f33078 CR3: 0000000049f77000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 debug_object_activate+0x68/0x4f0 lib/debugobjects.c:747 debug_rcu_head_queue kernel/rcu/rcu.h:190 [inline] call_rcu+0xa2/0x950 kernel/rcu/tree.c:2834 refdst_drop include/net/dst.h:256 [inline] skb_dst_drop include/net/dst.h:268 [inline] skb_release_head_state+0x6d/0x240 net/core/skbuff.c:840 skb_release_all net/core/skbuff.c:854 [inline] __kfree_skb net/core/skbuff.c:870 [inline] kfree_skb_reason+0x133/0x370 net/core/skbuff.c:893 kfree_skb include/linux/skbuff.h:1252 [inline] ip6_tnl_start_xmit+0xbe5/0x1290 net/ipv6/ip6_tunnel.c:1462 __netdev_start_xmit include/linux/netdevice.h:4894 [inline] netdev_start_xmit include/linux/netdevice.h:4908 [inline] xmit_one net/core/dev.c:3695 [inline] dev_hard_start_xmit+0x292/0x8b0 net/core/dev.c:3711 __dev_queue_xmit+0x1b4b/0x3810 net/core/dev.c:4375 neigh_output include/net/neighbour.h:545 [inline] ip6_finish_output2+0xdc6/0x15c0 net/ipv6/ip6_output.c:138 dst_output include/net/dst.h:453 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ndisc_send_skb+0xc04/0x1520 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3986 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x291/0x910 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1948 [inline] RIP: 0010:vprintk_emit+0x48b/0x6a0 kernel/printk/printk.c:2302 Code: 86 01 00 00 e8 96 10 1b 00 41 89 df 4d 85 f6 48 8b 5c 24 08 75 07 e8 84 10 1b 00 eb 06 e8 7d 10 1b 00 fb 48 c7 c7 20 1e b2 8c <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 fd d4 RSP: 0018:ffffc900035164c0 EFLAGS: 00000293 RAX: ffffffff81672373 RBX: ffffffff81672205 RCX: ffff88802518bc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8cb21e20 RBP: ffffc900035165b0 R08: ffffffff90b0f24f R09: 1ffffffff2161e49 R10: dffffc0000000000 R11: fffffbfff2161e4a R12: dffffc0000000000 R13: 1ffff920006a2c9c R14: 0000000000000200 R15: 0000000000000049 dev_vprintk_emit+0x32c/0x3de drivers/base/core.c:4948 dev_printk_emit+0xeb/0x139 drivers/base/core.c:4959 __netdev_printk+0x2ef/0x3d0 net/core/dev.c:11412 netdev_info+0x11b/0x16c net/core/dev.c:11467 nsim_udp_tunnel_set_port+0x28b/0x430 drivers/net/netdevsim/udp_tunnels.c:34 udp_tunnel_nic_device_sync_one net/ipv4/udp_tunnel_nic.c:-1 [inline] udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline] __udp_tunnel_nic_device_sync+0xa17/0x13c0 net/ipv4/udp_tunnel_nic.c:289 udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:312 [inline] __udp_tunnel_nic_add_port+0xb81/0xe90 net/ipv4/udp_tunnel_nic.c:531 udp_tunnel_nic_add_port include/net/udp_tunnel.h:348 [inline] udp_tunnel_notify_add_rx_port+0x290/0x3e0 net/ipv4/udp_tunnel_core.c:127 geneve_socket_create drivers/net/geneve.c:619 [inline] geneve_sock_add+0x526/0x980 drivers/net/geneve.c:694 geneve_open+0xcf/0x140 drivers/net/geneve.c:736 __dev_open+0x2c7/0x430 net/core/dev.c:1501 __dev_change_flags+0x1e4/0x6a0 net/core/dev.c:8676 dev_change_flags+0x78/0x1a0 net/core/dev.c:8748 do_setlink+0xbc7/0x29c0 net/core/rtnetlink.c:2845 __rtnl_newlink net/core/rtnetlink.c:3622 [inline] rtnl_newlink+0x16e4/0x1f90 net/core/rtnetlink.c:3669 rtnetlink_rcv_msg+0x863/0xfb0 net/core/rtnetlink.c:6166 netlink_rcv_skb+0x1ef/0x440 net/netlink/af_netlink.c:2516 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x7ad/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x497/0x650 net/socket.c:2153 __do_sys_sendto net/socket.c:2165 [inline] __se_sys_sendto net/socket.c:2161 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2161 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe2bf75e6ce Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007ffef09ad4b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000055558f5ae500 RCX: 00007fe2bf75e6ce RDX: 000000000000002c RSI: 00007fe2c0554670 RDI: 0000000000000003 RBP: 0000000000000001 R08: 00007ffef09ad534 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 00007fe2c0554670 R15: 0000000000000000