INFO: task syz.4.5701:25679 blocked for more than 144 seconds. Not tainted 6.14.0-rc1-syzkaller-00020-g0de63bb7d919 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.5701 state:D stack:23680 pid:25679 tgid:25676 ppid:16093 task_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0xf43/0x5890 kernel/sched/core.c:6764 __schedule_loop kernel/sched/core.c:6841 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6856 schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116 disable_device+0x170/0x280 drivers/infiniband/core/device.c:1279 __ib_unregister_device+0x2b4/0x480 drivers/infiniband/core/device.c:1502 ib_unregister_device_and_put+0x5a/0x80 drivers/infiniband/core/device.c:1567 nldev_dellink+0x211/0x300 drivers/infiniband/core/nldev.c:1825 rdma_nl_rcv_msg+0x388/0x6e0 drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x2e6/0x450 drivers/infiniband/core/netlink.c:239 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892 sock_sendmsg_nosec net/socket.c:713 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0xaaf/0xc90 net/socket.c:2568 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2622 __sys_sendmsg+0x16e/0x220 net/socket.c:2654 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f519c98cda9 RSP: 002b:00007f519d826038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f519cba5fa0 RCX: 00007f519c98cda9 RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 000000000000000e RBP: 00007f519ca0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f519cba5fa0 R15: 00007ffdfd41c658 Showing all locks held in the system: 3 locks held by kworker/u8:0/11: #0: ffff88814cd57148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc90000107d18 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 #2: ffffffff8fef49a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:129 [inline] #2: ffffffff8fef49a8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x121/0x14e0 net/ipv6/addrconf.c:4190 1 lock held by khungtaskd/30: #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746 2 locks held by getty/5576: #0: ffff888035fba0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:4/5866: #0: ffff8880232f0548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc90002ea7d18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 #2: ffff888028c1d190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline] #2: ffff888028c1d190 (&dev->mutex){....}-{4:4}, at: hub_event+0x1c1/0x4e10 drivers/usb/core/hub.c:5851 4 locks held by kworker/u8:7/16069: #0: ffff88801beeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3211 #1: ffffc90004567d18 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3212 #2: ffffffff8fededd0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xca/0xbf0 net/core/net_namespace.c:606 #3: ffff8880635946c0 (&device->unregistration_lock){+.+.}-{4:4}, at: rdma_dev_change_netns+0x30/0x320 drivers/infiniband/core/device.c:1650 2 locks held by syz.4.5701/25679: #0: ffffffff9ac050f8 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv_msg+0x16a/0x6e0 drivers/infiniband/core/netlink.c:164 #1: ffff8880635946c0 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x23b/0x480 drivers/infiniband/core/device.c:1498 1 lock held by syz.3.6183/27482: #0: ffff88807dfcf408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:865 [inline] #0: ffff88807dfcf408 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release+0x86/0x270 net/socket.c:641 3 locks held by syz.2.6195/27494: #0: ffffffff90626ca0 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:164 [inline] #0: ffffffff90626ca0 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:256 [inline] #0: ffffffff90626ca0 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x10f/0x2c0 net/core/rtnetlink.c:568 #1: ffffffff8fef49a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #1: ffffffff8fef49a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:335 [inline] #1: ffffffff8fef49a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x5d9/0x1d60 net/core/rtnetlink.c:4020 #2: ffffffff8e1c80f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:334 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc1-syzkaller-00020-g0de63bb7d919 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline] watchdog+0xf62/0x12b0 kernel/hung_task.c:399 kthread+0x3af/0x750 kernel/kthread.c:464 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 27494 Comm: syz.2.6195 Not tainted 6.14.0-rc1-syzkaller-00020-g0de63bb7d919 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] RIP: 0010:_raw_spin_lock_irqsave+0x4d/0x60 kernel/locking/spinlock.c:162 Code: 01 00 00 00 31 c9 ff 74 24 10 48 8d 7b 18 31 d2 31 f6 e8 f6 dc 3d f6 48 89 df e8 de 44 3e f6 58 48 89 e8 5b 5d c3 cc cc cc cc 5e b2 68 f6 eb c0 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 RSP: 0018:ffffc90000007bf8 EFLAGS: 00000006 RAX: fffffbfff355db71 RBX: ffffffff9aaedb90 RCX: dffffc0000000000 RDX: 0000000000001000 RSI: ffffffff9aaedb88 RDI: ffffffff9aaedb90 RBP: 0000000000000286 R08: 0000000000000007 R09: 0000000000014368 R10: 0000000000000000 R11: 0000000000000004 R12: ffffffff9aaedb88 R13: 000000000000286d R14: 0000000000000000 R15: ffff88805d308b00 FS: 00007fdb9136e6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555641075c8 CR3: 000000008d26c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1088 [inline] debug_check_no_obj_freed+0x1cf/0x600 lib/debugobjects.c:1129 slab_free_hook mm/slub.c:2284 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x29f/0x4d0 mm/slub.c:4757 slab_free_after_rcu_debug+0x69/0x340 mm/slub.c:4646 rcu_do_batch kernel/rcu/tree.c:2546 [inline] rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2802 handle_softirqs+0x213/0x8f0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline] RIP: 0010:vprintk_emit+0x621/0x6f0 kernel/printk/printk.c:2431 Code: 85 ed 0f 85 81 00 00 00 e8 ec 2a 20 00 9c 41 5c 41 81 e4 00 02 00 00 31 ff 4c 89 e6 e8 08 26 20 00 4d 85 e4 0f 85 8d 00 00 00 ca 2a 20 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00 RSP: 0018:ffffc90003dcea08 EFLAGS: 00000246 RAX: 0000000000080000 RBX: 000000000000004b RCX: ffffc90011366000 RDX: 0000000000080000 RSI: ffffffff8199a7c8 RDI: 0000000000000007 RBP: 1ffff920007b9d43 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000061 R12: 0000000000000000 R13: 0000000000000200 R14: ffff88801dafc880 R15: ffffc90003dcead0 dev_vprintk_emit drivers/base/core.c:4890 [inline] dev_printk_emit+0xfb/0x140 drivers/base/core.c:4901 __netdev_printk+0x1f7/0x500 net/core/dev.c:12202 netdev_info+0xe5/0x120 net/core/dev.c:12257 nsim_udp_tunnel_unset_port+0x2aa/0x3f0 drivers/net/netdevsim/udp_tunnels.c:64 udp_tunnel_nic_device_sync_one net/ipv4/udp_tunnel_nic.c:225 [inline] udp_tunnel_nic_device_sync_by_port net/ipv4/udp_tunnel_nic.c:246 [inline] __udp_tunnel_nic_device_sync.part.0+0x93a/0xe50 net/ipv4/udp_tunnel_nic.c:289 __udp_tunnel_nic_device_sync net/ipv4/udp_tunnel_nic.c:283 [inline] udp_tunnel_nic_device_sync+0x111/0x190 net/ipv4/udp_tunnel_nic.c:312 __udp_tunnel_nic_del_port+0x25e/0x2e0 net/ipv4/udp_tunnel_nic.c:548 udp_tunnel_nic_del_port include/net/udp_tunnel.h:359 [inline] udp_tunnel_nic_del_port include/net/udp_tunnel.h:354 [inline] udp_tunnel_notify_del_rx_port+0x23d/0x450 net/ipv4/udp_tunnel_core.c:148 __vxlan_sock_release_prep drivers/net/vxlan/vxlan_core.c:1519 [inline] __vxlan_sock_release_prep+0x23c/0x2b0 drivers/net/vxlan/vxlan_core.c:1507 vxlan_sock_release+0x12e/0x550 drivers/net/vxlan/vxlan_core.c:1545 vxlan_stop+0xb9/0x100 drivers/net/vxlan/vxlan_core.c:3191 __dev_close_many+0x1c5/0x360 net/core/dev.c:1688 dev_close_many+0x24c/0x6a0 net/core/dev.c:1713 unregister_netdevice_many_notify+0x48a/0x1f30 net/core/dev.c:11760 rtnl_newlink_create net/core/rtnetlink.c:3823 [inline] __rtnl_newlink net/core/rtnetlink.c:3906 [inline] rtnl_newlink+0x1459/0x1d60 net/core/rtnetlink.c:4021 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6911 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1892 sock_sendmsg_nosec net/socket.c:713 [inline] __sock_sendmsg net/socket.c:728 [inline] ____sys_sendmsg+0xaaf/0xc90 net/socket.c:2568 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2622 __sys_sendmsg+0x16e/0x220 net/socket.c:2654 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdb9058cda9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdb9136e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdb907a5fa0 RCX: 00007fdb9058cda9 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00007fdb9060e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdb907a5fa0 R15: 00007ffc04dc7c58