INFO: task syz.1.804:15994 blocked for more than 430 seconds.
      Not tainted 6.13.0-rc2-syzkaller-g21f1b85c8912 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.804       state:D stack:0     pid:15994 tgid:15994 ppid:3167   flags:0x0000000c
Call Trace:
[<ffffffff861cbf70>] context_switch kernel/sched/core.c:5369 [inline]
[<ffffffff861cbf70>] __schedule+0xdaa/0x393a kernel/sched/core.c:6756
[<ffffffff861cebc4>] __schedule_loop kernel/sched/core.c:6833 [inline]
[<ffffffff861cebc4>] schedule+0xc4/0x324 kernel/sched/core.c:6848
[<ffffffff861e2236>] schedule_timeout+0x1c6/0x28a kernel/time/sleep_timeout.c:75
[<ffffffff861d06a8>] do_wait_for_common kernel/sched/completion.c:95 [inline]
[<ffffffff861d06a8>] __wait_for_common+0x1ca/0x4b6 kernel/sched/completion.c:116
[<ffffffff861d09ae>] wait_for_common kernel/sched/completion.c:127 [inline]
[<ffffffff861d09ae>] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:148
[<ffffffff848bfc8c>] __vhost_worker_flush+0x204/0x274 drivers/vhost/vhost.c:288
[<ffffffff848bfdb0>] vhost_worker_flush drivers/vhost/vhost.c:295 [inline]
[<ffffffff848bfdb0>] vhost_dev_flush+0xb4/0x114 drivers/vhost/vhost.c:305
[<ffffffff848a8b4a>] vhost_net_flush+0x24/0x19e drivers/vhost/net.c:1359
[<ffffffff848a8fb8>] vhost_net_release+0xac/0x256 drivers/vhost/net.c:1380
[<ffffffff80ad4c7a>] __fput+0x378/0x9ee fs/file_table.c:450
[<ffffffff80ad5396>] ____fput+0x1c/0x26 fs/file_table.c:478
[<ffffffff801c1c92>] task_work_run+0x16a/0x25e kernel/task_work.c:239
[<ffffffff861c3128>] resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
[<ffffffff861c3128>] exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
[<ffffffff861c3128>] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
[<ffffffff861c3128>] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
[<ffffffff861c3128>] syscall_exit_to_user_mode+0x302/0x316 kernel/entry/common.c:218
[<ffffffff861c1e8a>] do_trap_ecall_u+0x86/0x216 arch/riscv/kernel/traps.c:345
[<ffffffff861e652a>] _new_vmalloc_restore_context_a0+0xc2/0xce

Showing all locks held in the system:
1 lock held by khungtaskd/37:
 #0: ffffffff881d0c40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x68/0x2e6 kernel/locking/lockdep.c:6740
2 locks held by getty/3130:
 #0: ff6000001bce00a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ff2000000008b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xd7c/0x129a drivers/tty/n_tty.c:2211
2 locks held by syz-executor/3160:
2 locks held by kworker/u9:2/10660:
3 locks held by kworker/u10:8/14167:
3 locks held by kworker/u10:4/14902:
 #0: ff60000011471148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x848/0x1f38 kernel/workqueue.c:3204
 #1: ff200000052c7c90 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x870/0x1f38 kernel/workqueue.c:3204
 #2: ffffffff895df208 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79
3 locks held by kworker/1:3/15830:
3 locks held by kworker/u8:3/15999:
 #0: ff6000001ca3a948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x848/0x1f38 kernel/workqueue.c:3204
 #1: ff200000053b7c90 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x870/0x1f38 kernel/workqueue.c:3204
 #2: ffffffff895df208 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79
1 lock held by syz-executor/16031:
 #0: ffffffff895df208 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff895df208 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline]
 #0: ffffffff895df208 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x65e/0x1ab6 net/core/rtnetlink.c:4008
5 locks held by kworker/u8:4/16037:
 #0: ff60000012289948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x848/0x1f38 kernel/workqueue.c:3204
 #1: ff200000052d7c90 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x870/0x1f38 kernel/workqueue.c:3204
 #2: ffffffff895c8a70 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xda/0x984 net/core/net_namespace.c:586
 #3: ffffffff895df208 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79
 #4: ffffffff881e1238 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x266/0x384 kernel/rcu/tree_exp.h:297
1 lock held by syz-executor/16837:
 #0: ffffffff895df208 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x22/0x2a net/core/rtnetlink.c:79
2 locks held by dhcpcd-run-hook/16847:

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.13.0-rc2-syzkaller-g21f1b85c8912 #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff80071bae>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
[<ffffffff8000325c>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:136
[<ffffffff8005e1f4>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff8005e1f4>] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120
[<ffffffff8005e288>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff86185c28>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff86185ee0>] nmi_trigger_cpumask_backtrace+0x2b6/0x458 lib/nmi_backtrace.c:62
[<ffffffff8007c972>] arch_trigger_cpumask_backtrace+0x2c/0x3e arch/riscv/kernel/smp.c:347
[<ffffffff804b88b8>] trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
[<ffffffff804b88b8>] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
[<ffffffff804b88b8>] watchdog+0xcee/0x1170 kernel/hung_task.c:397
[<ffffffff801c6f2c>] kthread+0x28c/0x3a4 kernel/kthread.c:389
[<ffffffff861e6642>] 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: 14540 Comm: kworker/u10:1 Not tainted 6.13.0-rc2-syzkaller-g21f1b85c8912 #0
Hardware name: riscv-virtio,qemu (DT)
Workqueue: events_unbound nsim_dev_trap_report_work
epc : walk_stackframe+0x1ee/0x452 arch/riscv/kernel/stacktrace.c:57
 ra : walk_stackframe+0x1ee/0x452 arch/riscv/kernel/stacktrace.c:57
epc : ffffffff80071588 ra : ffffffff80071588 sp : ff20000000f674c0
 gp : ffffffff899f4f80 tp : ff6000001acb3480 t0 : ff20000000f67810
 t1 : fffffffef2195f53 t2 : 0000000000000000 s0 : ff20000000f67540
 s1 : ff20000000f67a30 a0 : 0000000000000001 a1 : 0000000000000000
 a2 : 0000000000000001 a3 : ffffffff80071588 a4 : 0000000000000000
 a5 : ff6000001acb4480 a6 : 0000000000000003 a7 : 1fec000003596807
 s2 : ff20000000f67a00 s3 : 0000000000000009 s4 : 0000000000000001
 s5 : 0000000000000000 s6 : ffffffff84ebdbea s7 : dfffffff00000000
 s8 : dfffffff00000000 s9 : ffffffff861e63e4 s10: 0000000000007fff
 s11: ff20000000f67a30 t3 : ff6000001acb3fa0 t4 : fffffffef2195f53
 t5 : fffffffef2195f54 t6 : 0000000000000009
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff80071588>] walk_stackframe+0x1ee/0x452 arch/riscv/kernel/stacktrace.c:57
[<ffffffff861c20d4>] arch_stack_walk+0x1c/0x24 arch/riscv/kernel/stacktrace.c:163
[<ffffffff803a7bc2>] stack_trace_save+0xa0/0xd2 kernel/stacktrace.c:122
[<ffffffff80a1913a>] kasan_save_stack+0x3e/0x6a mm/kasan/common.c:47
[<ffffffff80a19190>] kasan_save_track+0x16/0x28 mm/kasan/common.c:68
[<ffffffff80a1bee8>] kasan_save_free_info+0x40/0x5c mm/kasan/generic.c:582
[<ffffffff80a194ae>] poison_slab_object mm/kasan/common.c:247 [inline]
[<ffffffff80a194ae>] __kasan_slab_free+0x4e/0x68 mm/kasan/common.c:264
[<ffffffff8097e3b6>] kasan_slab_free include/linux/kasan.h:233 [inline]
[<ffffffff8097e3b6>] slab_free_hook mm/slub.c:2338 [inline]
[<ffffffff8097e3b6>] slab_free mm/slub.c:4598 [inline]
[<ffffffff8097e3b6>] kfree+0x142/0x50c mm/slub.c:4746
[<ffffffff84ea47b0>] skb_kfree_head net/core/skbuff.c:1086 [inline]
[<ffffffff84ea47b0>] skb_free_head+0x230/0x2ec net/core/skbuff.c:1098
[<ffffffff84eaff66>] skb_release_data+0x6ec/0x86a net/core/skbuff.c:1125
[<ffffffff84ebdbea>] skb_release_all net/core/skbuff.c:1190 [inline]
[<ffffffff84ebdbea>] __kfree_skb net/core/skbuff.c:1204 [inline]
[<ffffffff84ebdbea>] consume_skb net/core/skbuff.c:1436 [inline]
[<ffffffff84ebdbea>] consume_skb+0xca/0xfa net/core/skbuff.c:1430
[<ffffffff834d0706>] nsim_dev_trap_report drivers/net/netdevsim/dev.c:821 [inline]
[<ffffffff834d0706>] nsim_dev_trap_report_work+0x8b6/0xc96 drivers/net/netdevsim/dev.c:851
[<ffffffff801a7a24>] process_one_work+0x968/0x1f38 kernel/workqueue.c:3229
[<ffffffff801a95b2>] process_scheduled_works kernel/workqueue.c:3310 [inline]
[<ffffffff801a95b2>] worker_thread+0x5be/0xdc6 kernel/workqueue.c:3391
[<ffffffff801c6f2c>] kthread+0x28c/0x3a4 kernel/kthread.c:389
[<ffffffff861e6642>] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:326