INFO: task syz-executor.4:23283 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc4-next-20240212-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:20984 pid:23283 tgid:23283 ppid:1      flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x17df/0x4a40 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6804 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6819
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6876
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 new_device_store+0x1b4/0x890 drivers/net/netdevsim/bus.c:166
 kernfs_fop_write_iter+0x3a1/0x500 fs/kernfs/file.c:334
 call_write_iter include/linux/fs.h:2103 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa84/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f107587caef
RSP: 002b:00007ffc7d4571b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f107587caef
RDX: 0000000000000003 RSI: 00007ffc7d457200 RDI: 0000000000000005
RBP: 00007f10758ca045 R08: 0000000000000000 R09: 00007ffc7d457007
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 00007ffc7d457200 R14: 00007f10764d4620 R15: 0000000000000003
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8e131520 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u8:2/32:
2 locks held by getty/4824:
 #0: ffff88802eb520a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by kworker/u8:3/1703:
 #0: ffff88802a18e948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
 #0: ffff88802a18e948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
 #1: ffffc90004f27d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
 #1: ffffc90004f27d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
 #2: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4671
3 locks held by kworker/0:1/3854:
 #0: ffff888014c7c948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
 #0: ffff888014c7c948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
 #1: ffffc9000a927d00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
 #1: ffffc9000a927d00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
 #2: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:75
5 locks held by kworker/u8:4/23222:
 #0: ffff888015ad5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
 #0: ffff888015ad5948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
 #1: ffffc9001505fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3121 [inline]
 #1: ffffc9001505fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x8e1/0x1730 kernel/workqueue.c:3226
 #2: ffffffff8f378b90 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:591
 #3: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: cleanup_net+0x6af/0xcc0 net/core/net_namespace.c:627
 #4: ffffffff8e1368b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #4: ffffffff8e1368b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x39a/0x820 kernel/rcu/tree_exp.h:939
1 lock held by syz-executor.2/23267:
 #0: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:696 [inline]
 #0: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3e/0x1b0 drivers/net/tun.c:3504
7 locks held by syz-executor.1/23279:
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2810 [inline]
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #1: ffff888017ef0488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff88801fbcf788 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8ecbf828 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
 #4: ffff88803e8d00e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline]
 #4: ffff88803e8d00e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
 #4: ffff88803e8d00e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292
 #5: ffff88803e883250 (&devlink->lock_key){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672
 #6: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x40/0x160 drivers/net/netdevsim/netdev.c:417
4 locks held by syz-executor.4/23283:
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2810 [inline]
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #1: ffff8880831bdc88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff88801fbcf698 (kn->active#51){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8ecbf828 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x1b4/0x890 drivers/net/netdevsim/bus.c:166
4 locks held by syz-executor.2/23607:
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2810 [inline]
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #1: ffff8880acd98488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff88801fbcf788 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8ecbf828 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.1/23665:
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2810 [inline]
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #1: ffff88801ebbec88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff88801fbcf788 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8ecbf828 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.4/23708:
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2810 [inline]
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #1: ffff88807e7b2488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff88801fbcf788 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8ecbf828 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.2/24080:
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2810 [inline]
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #1: ffff888015f8cc88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff88801fbcf788 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8ecbf828 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.1/24158:
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2810 [inline]
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #1: ffff8881d54a4488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff88801fbcf788 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8ecbf828 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
4 locks held by syz-executor.4/24204:
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2810 [inline]
 #0: ffff88802a9be420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #1: ffff888022891888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff88801fbcf788 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8ecbf828 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
1 lock held by syz-executor.2/24600:
 #0: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f385208 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6603

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

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc4-next-20240212-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfb0/0xff0 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 19683 Comm: syz-fuzzer Not tainted 6.8.0-rc4-next-20240212-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:arch_exit_to_user_mode arch/x86/include/asm/entry-common.h:95 [inline]
RIP: 0010:exit_to_user_mode include/linux/entry-common.h:364 [inline]
RIP: 0010:syscall_exit_to_user_mode+0x212/0x370 kernel/entry/common.c:214
Code: 92 74 85 c0 0f 85 d8 00 00 00 e8 a9 13 02 f6 90 90 e8 92 57 2b f6 e8 cd 77 01 f6 90 0f 1f 44 00 00 66 90 0f 00 2d 7c 92 3c 00 <f3> 0f 1e fa e8 e5 c5 ff ff 48 8b 7c 24 30 e8 4b f6 ff ff 48 83 c4
RSP: 0018:ffffc90014757ed8 EFLAGS: 00000046
RAX: e6741a72f7654800 RBX: 0000000000000000 RCX: ffffffff944b6603
RDX: dffffc0000000000 RSI: ffffffff8baac9e0 RDI: ffffffff8bfe8fa0
RBP: ffffc90014757f48 R08: ffffffff8f867d2f R09: 1ffffffff1f0cfa5
R10: dffffc0000000000 R11: fffffbfff1f0cfa6 R12: ffff8880215abc00
R13: 0000000000000000 R14: ffffc90014757f58 R15: 0000000000000119
FS:  000000c01dd01090(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f515ff465f8 CR3: 00000000186f6000 CR4: 00000000003506f0
DR0: 000000000000d8dd DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x40720e
Code: 48 83 ec 38 e8 13 00 00 00 48 83 c4 38 5d c3 cc cc cc cc cc cc cc cc cc cc cc cc cc 49 89 f2 48 89 fa 48 89 ce 48 89 df 0f 05 <48> 3d 01 f0 ff ff 76 15 48 f7 d8 48 89 c1 48 c7 c0 ff ff ff ff 48
RSP: 002b:000000c0117dd748 EFLAGS: 00000246 ORIG_RAX: 0000000000000119
RAX: 0000000000000000 RBX: 0000000000000004 RCX: 000000000040720e
RDX: 0000000000000080 RSI: 000000c0117dd818 RDI: 0000000000000004
RBP: 000000c0117dd790 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000c0117dd820
R13: 000000c0008a978c R14: 000000c006ac8340 R15: 0000000000000000
 </TASK>