INFO: task syz-executor:4239 blocked for more than 430 seconds. Not tainted 6.12.0-rc1-syzkaller-00002-gcfb10de18538 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4239 tgid:4239 ppid:1 flags:0x00000006 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 [] tun_detach drivers/net/tun.c:704 [inline] [] tun_chr_close+0xde/0x230 drivers/net/tun.c:3517 [] __fput+0x378/0x9e6 fs/file_table.c:431 [] ____fput+0x1c/0x26 fs/file_table.c:459 [] task_work_run+0x16a/0x25e kernel/task_work.c:228 [] exit_task_work include/linux/task_work.h:40 [inline] [] do_exit+0xa4c/0x2986 kernel/exit.c:939 [] do_group_exit+0xd4/0x26c kernel/exit.c:1088 [] get_signal+0x1e98/0x23b0 kernel/signal.c:2917 [] arch_do_signal_or_restart+0x8d6/0x1190 arch/riscv/kernel/signal.c:437 [] exit_to_user_mode_loop kernel/entry/common.c:111 [inline] [] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] [] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] [] syscall_exit_to_user_mode+0x2a6/0x31e kernel/entry/common.c:218 [] do_trap_ecall_u+0x86/0x216 arch/riscv/kernel/traps.c:345 [] _new_vmalloc_restore_context_a0+0xc2/0xce 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/36: #0: ffffffff87fcc100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x68/0x2d6 kernel/locking/lockdep.c:6716 2 locks held by kworker/1:2/1834: 1 lock held by syslogd/2995: 2 locks held by getty/3151: #0: ff6000001d20d0a0 (&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 2 locks held by syz-executor/3176: 2 locks held by kworker/1:3/3814: 1 lock held by syz-executor/4239: #0: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 4 locks held by kworker/R-wg-cr/4444: 1 lock held by kworker/R-wg-cr/4447: #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/4450: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 2 locks held by kworker/0:3/4553: 2 locks held by kworker/1:0/4770: 3 locks held by kworker/u9:16/5361: #0: ff60000011071148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff20000002ef7c90 ((work_completion)(&pool->idle_cull_work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204 #2: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: idle_cull_fn+0xc0/0x434 kernel/workqueue.c:2951 1 lock held by syz-executor/5414: #0: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 1 lock held by kworker/R-wg-cr/5551: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 3 locks held by kworker/R-wg-cr/5554: 1 lock held by kworker/R-wg-cr/5557: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 2 locks held by kworker/1:1/6052: 4 locks held by kworker/1:6/6279: 4 locks held by kworker/0:2/6280: #0: ff6000001820a548 ((wq_completion)wg-kex-wg0#4){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff20000004ea7c90 ((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: ff60000019a0d208 (&wg->static_identity.lock){++++}-{3:3}, at: wg_noise_handshake_consume_initiation+0x12c/0x904 drivers/net/wireguard/noise.c:598 #3: ff6000001c7dc4d8 (&handshake->lock){++++}-{3:3}, at: wg_noise_handshake_consume_initiation+0x4b4/0x904 drivers/net/wireguard/noise.c:632 4 locks held by kworker/u10:0/6282: #0: ff6000002e9a1948 ((wq_completion)wg-kex-wg0#3){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff20000001b97c90 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204 #2: ff60000019a0d208 (&wg->static_identity.lock){++++}-{3:3}, at: wg_noise_handshake_create_initiation+0xe4/0x5f0 drivers/net/wireguard/noise.c:529 #3: ff6000001c7dc4d8 (&handshake->lock){++++}-{3:3}, at: wg_noise_handshake_create_initiation+0xee/0x5f0 drivers/net/wireguard/noise.c:530 4 locks held by syz-executor/6295: #0: ff6000001c2b2420 (sb_writers#7){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1716 [inline] #0: ff6000001c2b2420 (sb_writers#7){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1852 [inline] #0: ff6000001c2b2420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #0: ff6000001c2b2420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x728/0x9b4 fs/read_write.c:679 #1: ff60000029146088 (&of->mutex#2){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x23a/0x460 fs/kernfs/file.c:325 #2: ff6000001aca4c38 (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 7 locks held by syz-executor/6297: #0: ff6000001c2b2420 (sb_writers#7){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1716 [inline] #0: ff6000001c2b2420 (sb_writers#7){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1852 [inline] #0: ff6000001c2b2420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #0: ff6000001c2b2420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x728/0x9b4 fs/read_write.c:679 #1: ff6000002988fc88 (&of->mutex#2){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x23a/0x460 fs/kernfs/file.c:325 #2: ff6000001aca4c38 (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: ff600000189330e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ff600000189330e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ff600000189330e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x9c/0x572 drivers/base/dd.c:1293 #5: ff60000018931250 (&devlink->lock_key#5){+.+.}-{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 3 locks held by kworker/1:7/6319: 1 lock held by kworker/1:8/6896: #0: ffffffff87e86d68 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x36/0x3c4 kernel/workqueue.c:2669 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 36 Comm: khungtaskd Not tainted 6.12.0-rc1-syzkaller-00002-gcfb10de18538 #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: 5554 Comm: kworker/R-wg-cr Not tainted 6.12.0-rc1-syzkaller-00002-gcfb10de18538 #0 Hardware name: riscv-virtio,qemu (DT) Workqueue: wg-crypt-wg1 wg_packet_decrypt_worker epc : arch_local_irq_restore+0xc/0x12 arch/riscv/include/asm/irqflags.h:52 ra : lock_is_held_type+0x150/0x1f2 kernel/locking/lockdep.c:5899 epc : ffffffff80232184 ra : ffffffff85fda606 sp : ff20000000017530 gp : ffffffff897bea80 tp : ff6000001c238000 t0 : ff6000001c238b20 t1 : ff6000001c238bc0 t2 : 0000000000000006 s0 : ff20000000017540 s1 : ffffffff90b60b08 a0 : 0000000000000002 a1 : ffffffff8643e8a0 a2 : 0000000000f00000 a3 : 0000000000000001 a4 : 0000000000000000 a5 : 0000000000000001 a6 : 0000000000f00000 a7 : 0000000056e543b7 s2 : ff6000006ec3a708 s3 : 0000000000000001 s4 : ff6000001c239000 s5 : ffffffffffffffff s6 : 0000000200000022 s7 : ffffffff86258708 s8 : ffffffff90b60b00 s9 : 0000000000000003 s10: ffffffffffffffff s11: 1fec00000397ce35 t3 : 1fec000003847163 t4 : 000000000000000f t5 : 8374b928a67c3bc0 t6 : 1fec00000384717c status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001 [] arch_local_irq_restore+0xc/0x12 arch/riscv/include/asm/irqflags.h:51 [] lock_is_held_type+0x150/0x1f2 kernel/locking/lockdep.c:5899 [] lock_is_held include/linux/lockdep.h:249 [inline] [] rcu_read_lock_held kernel/rcu/update.c:351 [inline] [] rcu_read_lock_held+0x3c/0x4e kernel/rcu/update.c:345 [] net_generic+0x274/0x310 include/net/netns/generic.h:46 [] nf_ct_pernet include/net/netfilter/nf_conntrack.h:372 [inline] [] nf_conntrack_free+0x140/0x4a4 net/netfilter/nf_conntrack_core.c:1736 [] nf_ct_destroy+0x176/0x272 net/netfilter/nf_conntrack_core.c:598 [] nf_ct_put include/net/netfilter/nf_conntrack.h:186 [inline] [] nf_ct_put include/net/netfilter/nf_conntrack.h:183 [inline] [] nf_conntrack_in+0x728/0x1b28 net/netfilter/nf_conntrack_core.c:2061 [] ipv4_conntrack_in+0x20/0x2e net/netfilter/nf_conntrack_proto.c:207 [] 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_rcv+0x20e/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