INFO: task kworker/u8:1:9129 blocked for more than 430 seconds. Not tainted 6.12.0-rc1-syzkaller-00010-gc05ad457ce8c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:1 state:D stack:0 pid:9129 tgid:9129 ppid:2 flags:0x00000000 Workqueue: netns cleanup_net Call Trace: [] context_switch kernel/sched/core.c:5315 [inline] [] __schedule+0xd5a/0x3886 kernel/sched/core.c:6675 [] __schedule_loop kernel/sched/core.c:6752 [inline] [] schedule+0xc4/0x324 kernel/sched/core.c:6767 [] schedule_timeout+0x1e2/0x296 kernel/time/timer.c:2591 [] do_wait_for_common kernel/sched/completion.c:95 [inline] [] __wait_for_common+0x1ca/0x4b6 kernel/sched/completion.c:116 [] wait_for_common kernel/sched/completion.c:127 [inline] [] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:148 [] rcu_barrier+0x2dc/0x6cc kernel/rcu/tree.c:4629 [] netdev_run_todo+0x294/0x105e net/core/dev.c:10778 [] rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:152 [] cleanup_net+0x52c/0x984 net/core/net_namespace.c:622 [] process_one_work+0x956/0x1dae kernel/workqueue.c:3229 [] process_scheduled_works kernel/workqueue.c:3310 [inline] [] worker_thread+0x5be/0xdc6 kernel/workqueue.c:3391 [] kthread+0x28c/0x3a6 kernel/kthread.c:389 [] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326 Showing all locks held in the system: 1 lock held by kworker/R-mm_pe/13: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 1 lock held by khungtaskd/37: #0: ffffffff87fcc100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x68/0x2d6 kernel/locking/lockdep.c:6716 1 lock held by kworker/R-dm_bu/1603: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x73e/0xc72 kernel/workqueue.c:3526 2 locks held by getty/3149: #0: ff6000001c91e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340 #1: ff2000000008b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xd7c/0x129a drivers/tty/n_tty.c:2211 1 lock held by syz-executor/3175: 1 lock held by kworker/R-wg-cr/3380: 1 lock held by kworker/R-wg-cr/3395: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 1 lock held by kworker/R-wg-cr/3410: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x73e/0xc72 kernel/workqueue.c:3526 2 locks held by kworker/1:2/3794: 2 locks held by kworker/1:4/3867: 2 locks held by kworker/u9:1/5570: 2 locks held by kworker/1:1/6157: 3 locks held by kworker/0:3/6177: 1 lock held by kworker/R-wg-cr/6334: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x73e/0xc72 kernel/workqueue.c:3526 1 lock held by kworker/R-wg-cr/6339: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 1 lock held by kworker/R-wg-cr/6342: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x73e/0xc72 kernel/workqueue.c:3526 2 locks held by kworker/1:0/6978: 2 locks held by kworker/1:6/7840: 1 lock held by kworker/R-wg-cr/8331: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 1 lock held by kworker/R-wg-cr/8334: 1 lock held by kworker/R-wg-cr/8337: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 2 locks held by kworker/1:3/8655: 4 locks held by kworker/0:0/8744: #0: ff6000002d93dd48 ((wq_completion)wg-kex-wg1#2){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff20000003687c90 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __asm__ ("" : "=r"(__ptr) : "0"((typeof(*((worker))) *)((worker)))); (typeof((typeof(*((worker))) *)((worker)))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204 #2: ff6000002d961208 (&wg->static_identity.lock){++++}-{3:3}, at: wg_noise_handshake_consume_initiation+0x12c/0x904 drivers/net/wireguard/noise.c:598 #3: ff6000002e0c0c98 (&handshake->lock){++++}-{3:3}, at: wg_noise_handshake_consume_initiation+0x4b4/0x904 drivers/net/wireguard/noise.c:632 2 locks held by kworker/1:5/8745: 1 lock held by kworker/R-wg-cr/8893: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x73e/0xc72 kernel/workqueue.c:3526 2 locks held by kworker/R-wg-cr/8896: 1 lock held by kworker/R-wg-cr/8899: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool kernel/workqueue.c:2727 [inline] #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: rescuer_thread+0x73e/0xc72 kernel/workqueue.c:3526 4 locks held by kworker/u8:1/9129: #0: ff60000011e81948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff200000076a7c90 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204 #2: ffffffff89397670 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xda/0x984 net/core/net_namespace.c:580 #3: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 2 locks held by kworker/1:7/9219: 2 locks held by kworker/1:8/9418: 1 lock held by syz.0.916/9431: #0: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 2 locks held by kworker/u9:3/9440: #0: ff60000011071148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff20000002ab7c90 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204 7 locks held by syz-executor/9467: #0: ff6000001bec4420 (sb_writers#7){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1716 [inline] #0: ff6000001bec4420 (sb_writers#7){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1852 [inline] #0: ff6000001bec4420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #0: ff6000001bec4420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x728/0x9b4 fs/read_write.c:679 #1: ff600000367dcc88 (&of->mutex#2){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x23a/0x460 fs/kernfs/file.c:325 #2: ff6000001b5f4a58 (kn->active#4){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x258/0x460 fs/kernfs/file.c:326 #3: ffffffff88c129e8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xf0/0x48c drivers/net/netdevsim/bus.c:216 #4: ff6000001b1f10e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ff6000001b1f10e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ff6000001b1f10e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x9c/0x572 drivers/base/dd.c:1293 #5: ff6000001b698250 (&devlink->lock_key#4){+.+.}-{3:3}, at: devl_lock+0x22/0x2c net/devlink/core.c:276 #6: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 2 locks held by kworker/1:9/9566: 4 locks held by kworker/1:10/9831: 1 lock held by kworker/1:11/9874: 1 lock held by syz.1.967/9921: #0: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 2 locks held by syz-executor/9927: 2 locks held by modprobe/9931: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.0-rc1-syzkaller-00010-gc05ad457ce8c #0 Hardware name: riscv-virtio,qemu (DT) Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130 [] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:136 [] __dump_stack lib/dump_stack.c:94 [inline] [] dump_stack_lvl+0x122/0x196 lib/dump_stack.c:120 [] dump_stack+0x1c/0x24 lib/dump_stack.c:129 [] nmi_cpu_backtrace+0x39c/0x39e lib/nmi_backtrace.c:113 [] nmi_trigger_cpumask_backtrace+0x2b6/0x456 lib/nmi_backtrace.c:62 [] arch_trigger_cpumask_backtrace+0x2c/0x3c arch/riscv/kernel/smp.c:347 [] trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] [] watchdog+0xcfa/0x1178 kernel/hung_task.c:379 [] kthread+0x28c/0x3a6 kernel/kthread.c:389 [] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 3867 Comm: kworker/1:4 Not tainted 6.12.0-rc1-syzkaller-00010-gc05ad457ce8c #0 Hardware name: riscv-virtio,qemu (DT) Workqueue: wg-crypt-wg1 wg_packet_tx_worker epc : ipt_do_table+0x4d6/0x1d54 net/ipv4/netfilter/ip_tables.c:263 ra : ipt_do_table+0x4aa/0x1d54 net/ipv4/netfilter/ip_tables.c:261 epc : ffffffff855d3368 ra : ffffffff855d333c sp : ff20000000017480 gp : ffffffff897bea80 tp : ff60000019e54ec0 t0 : ff60000019e559e0 t1 : 0000000000000000 t2 : 0000000000000006 s0 : ff20000000017730 s1 : 0000000000000001 a0 : 0000000000000001 a1 : ffffffff867152a0 a2 : ff6000002b63c840 a3 : ff6000002b63c838 a4 : ff6000002b63c800 a5 : 0000000000000000 a6 : 0000000000f00000 a7 : 1fec0000033cab45 s2 : 0000000000000001 s3 : ffffffff90b60b08 s4 : dfffffff00000000 s5 : ff6000002e93b8c0 s6 : ff200000000177f0 s7 : 1fe4000000002ec8 s8 : ff200000000176c0 s9 : 0000000000000003 s10: ff6000003c442900 s11: ff20000000017660 t3 : 1fec0000031df902 t4 : ffffffff87217028 t5 : ff600000207aa138 t6 : 1fec0000033cab4f status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001 [] ipt_do_table+0x4d6/0x1d54 net/ipv4/netfilter/ip_tables.c:263 [] nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline] [] nf_hook_slow+0xb8/0x1ec net/netfilter/core.c:626 [] nf_hook include/linux/netfilter.h:269 [inline] [] NF_HOOK include/linux/netfilter.h:312 [inline] [] ip_local_deliver+0x2ea/0x568 net/ipv4/ip_input.c:254 [] dst_input include/net/dst.h:460 [inline] [] ip_rcv_finish+0x1b0/0x2d2 net/ipv4/ip_input.c:449 [] NF_HOOK include/linux/netfilter.h:314 [inline] [] NF_HOOK include/linux/netfilter.h:308 [inline] [] ip_rcv+0xd6/0x44e net/ipv4/ip_input.c:569 [] __netif_receive_skb_one_core+0x106/0x16e net/core/dev.c:5662 [] __netif_receive_skb+0x2c/0x144 net/core/dev.c:5775 [] process_backlog+0x4fc/0x1cbc net/core/dev.c:6107 [] __napi_poll.constprop.0+0xaa/0x4b8 net/core/dev.c:6771 [] napi_poll net/core/dev.c:6840 [inline] [] net_rx_action+0xa12/0xf10 net/core/dev.c:6962 [] handle_softirqs+0x4a6/0x10de kernel/softirq.c:554 [] __do_softirq+0x12/0x1a kernel/softirq.c:588 [] ___do_softirq+0x18/0x20 arch/riscv/kernel/irq.c:85 [] call_on_irq_stack+0x32/0x40 arch/riscv/kernel/entry.S:355