INFO: task kworker/u9:0:3204 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:kworker/u9:0 state:D stack:0 pid:3204 tgid:3204 ppid:2 flags:0x00000000 Workqueue: events_unbound bpf_map_free_deferred 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_preempt_disabled+0x16/0x28 kernel/sched/core.c:6824 [] __mutex_lock_common kernel/locking/mutex.c:684 [inline] [] __mutex_lock+0x86a/0x1022 kernel/locking/mutex.c:752 [] mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:804 [] rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 [] dev_map_free+0x11c/0x6b8 kernel/bpf/devmap.c:214 [] bpf_map_free kernel/bpf/syscall.c:744 [inline] [] bpf_map_free_deferred+0x21e/0x46a kernel/bpf/syscall.c:768 [] 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: 2 locks held by kworker/1:1/33: 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 3 locks held by kworker/u9:2/47: #0: ff60000011071148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff20000000397c90 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204 #2: ffffffff893adde8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79 2 locks held by kworker/1:2/3033: 2 locks held by getty/3162: #0: ff6000001d2c90a0 (&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/3199: 3 locks held by kworker/u9:0/3204: #0: ff60000011071148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff20000007837c90 ((work_completion)(&map->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204 #2: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 3 locks held by kworker/u8:3/3545: #0: ff6000001c66c948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x848/0x1dae kernel/workqueue.c:3204 #1: ff2000000c4f7c90 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1dae kernel/workqueue.c:3204 #2: ffffffff893adde8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79 2 locks held by kworker/0:3/3842: 2 locks held by kworker/1:4/3900: 3 locks held by kworker/1:5/4029: 2 locks held by kworker/1:6/4699: 3 locks held by kworker/1:7/4716: 1 lock held by syz.0.301/4737: #0: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 2 locks held by kworker/1:9/4746: 7 locks held by syz-executor/4765: #0: ff6000001dc16420 (sb_writers#7){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1716 [inline] #0: ff6000001dc16420 (sb_writers#7){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1852 [inline] #0: ff6000001dc16420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #0: ff6000001dc16420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x728/0x9b4 fs/read_write.c:679 #1: ff60000019ce4088 (&of->mutex#2){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x23a/0x460 fs/kernfs/file.c:325 #2: ff6000001b4162d8 (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: ff600000192f10e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ff600000192f10e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ff600000192f10e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x9c/0x572 drivers/base/dd.c:1293 #5: ff600000192f0250 (&devlink->lock_key){+.+.}-{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/1:11/4781: 2 locks held by kworker/1:13/5150: 1 lock held by syz.1.374/5281: #0: ffffffff87fdc6c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x56/0x6cc kernel/rcu/tree.c:4561 4 locks held by syz-executor/5289: #0: ff6000001dc16420 (sb_writers#7){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1716 [inline] #0: ff6000001dc16420 (sb_writers#7){.+.+}-{0:0}, at: sb_start_write include/linux/fs.h:1852 [inline] #0: ff6000001dc16420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #0: ff6000001dc16420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x728/0x9b4 fs/read_write.c:679 #1: ff60000019110888 (&of->mutex#2){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x23a/0x460 fs/kernfs/file.c:325 #2: ff6000001b4162d8 (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 2 locks held by syz-executor/5592: #0: ffffffff893adde8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff893adde8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3e2/0xdbe net/core/rtnetlink.c:6643 #1: ffffffff87fdc7f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x266/0x384 kernel/rcu/tree_exp.h:297 ============================================= 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: 25 Comm: ksoftirqd/1 Not tainted 6.12.0-rc1-syzkaller-00002-gcfb10de18538 #0 Hardware name: riscv-virtio,qemu (DT) epc : preempt_count include/asm-generic/preempt.h:11 [inline] epc : should_resched include/asm-generic/preempt.h:77 [inline] epc : __local_bh_enable_ip+0x392/0x5ee kernel/softirq.c:389 ra : __local_bh_enable_ip+0x38e/0x5ee kernel/softirq.c:387 epc : ffffffff800e2674 ra : ffffffff800e2670 sp : ff200000001b7230 gp : ffffffff897bea80 tp : ff60000012aa1a40 t0 : ff60000012aa2560 t1 : 0000000000000000 t2 : 0000000000000006 s0 : ff200000001b7280 s1 : 0000000000000101 a0 : 0000000000000001 a1 : ffffffff8643e620 a2 : 0000000000000003 a3 : 0000000000000100 a4 : 0000000000000001 a5 : 00000000000ec450 a6 : 0000000000f00000 a7 : 0000000000000000 s2 : ff60000012aa1a40 s3 : ffffffff855d3cf6 s4 : 0000000000000001 s5 : ffffffff90b60b00 s6 : 1fec000002554349 s7 : ffffffff897f7f20 s8 : ff200000001b74c0 s9 : dfffffff00000000 s10: ff6000003b710100 s11: ff200000001b7460 t3 : 1fec000005b08f02 t4 : ffffffff87217028 t5 : ff60000016ff8138 t6 : 1fec0000025544b5 status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001 [] arch_local_irq_enable arch/riscv/include/asm/irqflags.h:21 [inline] [] __local_bh_enable_ip+0x392/0x5ee kernel/softirq.c:387 [] local_bh_enable include/linux/bottom_half.h:33 [inline] [] ipt_do_table+0xe9a/0x1d54 net/ipv4/netfilter/ip_tables.c:357 [] 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 [] run_ksoftirqd kernel/softirq.c:927 [inline] [] run_ksoftirqd+0xce/0x144 kernel/softirq.c:919 [] smpboot_thread_fn+0x654/0xb98 kernel/smpboot.c:164 [] kthread+0x28c/0x3a6 kernel/kthread.c:389 [] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326