INFO: task syz-executor.1:14101 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc2-syzkaller-00394-g032a954061af #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:24360 pid:14101 ppid:1      flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0xc91/0x5770 kernel/sched/core.c:6622
 schedule+0xde/0x1a0 kernel/sched/core.c:6698
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757
 rwsem_down_write_slowpath+0x3e2/0x1220 kernel/locking/rwsem.c:1178
 __down_write_common kernel/locking/rwsem.c:1306 [inline]
 __down_write kernel/locking/rwsem.c:1315 [inline]
 down_write+0x1d2/0x200 kernel/locking/rwsem.c:1574
 register_netdevice_notifier+0x22/0x270 net/core/dev.c:1712
 devlink_alloc_ns+0x144/0xac0 net/devlink/core.c:208
 nsim_drv_probe+0xba/0x13d0 drivers/net/netdevsim/dev.c:1533
 call_driver_probe drivers/base/dd.c:552 [inline]
 really_probe+0x240/0xca0 drivers/base/dd.c:631
 __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:768
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:798
 __device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:926
 bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457
 __device_attach+0x1e4/0x4b0 drivers/base/dd.c:998
 bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
 device_add+0x11c4/0x1c50 drivers/base/core.c:3589
 nsim_bus_dev_new drivers/net/netdevsim/bus.c:290 [inline]
 new_device_store+0x40e/0x690 drivers/net/netdevsim/bus.c:167
 bus_attr_store+0x76/0xa0 drivers/base/bus.c:170
 sysfs_kf_write+0x114/0x170 fs/sysfs/file.c:136
 kernfs_fop_write_iter+0x3f1/0x600 fs/kernfs/file.c:334
 call_write_iter include/linux/fs.h:1851 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9ed/0xe10 fs/read_write.c:584
 ksys_write+0x12b/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd246a3de7f
RSP: 002b:00007ffeda5c4f00 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fd246a3de7f
RDX: 0000000000000003 RSI: 00007ffeda5c4f50 RDI: 0000000000000005
RBP: 0000000000000005 R08: 0000000000000000 R09: 00007ffeda5c4ea0
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd246ae7772
R13: 00007ffeda5c4f50 R14: 0000000000000000 R15: 00007ffeda5c5620
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8c794b70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8c794870 (rcu_tasks_trace.tasks_gp_mutex
){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/28:
 #0: 
ffffffff8c7956c0
 (rcu_read_lock
){....}-{1:2}
, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6495
2 locks held by getty/4760:
 #0: 
ffff88814ad24098
 (
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
 #1: 
ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177
3 locks held by kworker/u4:6/5177:
3 locks held by kworker/u4:9/8278:
6 locks held by syz-executor.1/14101:
 #0: ffff88807f0d6460 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12b/0x250 fs/read_write.c:637
 #1: ffff888029610488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x285/0x600 fs/kernfs/file.c:325
 #2: ffff888147568830 (kn->active#52){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x2a9/0x600 fs/kernfs/file.c:326
 #3: ffffffff8d7e16c8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x170/0x690 drivers/net/netdevsim/bus.c:160
 #4: ffff8880573570e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:832 [inline]
 #4: ffff8880573570e8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:973
 #5: ffffffff8e0e9090 (pernet_ops_rwsem){++++}-{3:3}, at: register_netdevice_notifier+0x22/0x270 net/core/dev.c:1712
1 lock held by syz-executor.1/14123:
 #0: ffffffff8e0e9090 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4cb/0x8e0 net/core/net_namespace.c:486

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc2-syzkaller-00394-g032a954061af #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xe16/0x1090 kernel/hung_task.c:379
 kthread+0x2e8/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4433 Comm: klogd Not tainted 6.3.0-rc2-syzkaller-00394-g032a954061af #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0033:0x7f50391c6678
Code: 07 00 00 0f 85 f6 00 00 00 4c 8d 25 32 1e 07 00 48 63 dd ba ff 03 00 00 bf 02 00 00 00 29 ea 4c 01 e3 48 89 de e8 38 08 fc ff <85> c0 79 1d 48 8b 05 25 1c 07 00 83 38 04 74 c2 48 8d 3d 4f 42 06
RSP: 002b:00007ffd12dfdd40 EFLAGS: 00000203
RAX: 00000000000003ed RBX: 00007f5039238490 RCX: 00007f50390ab8b7
RDX: 00000000000003ff RSI: 00007f5039238490 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000561537e9bd30
R10: 0000000000004000 R11: 0000000000000206 R12: 00007f5039238490
R13: 00007f50392384ab R14: 00007f50392384ab R15: 0000000000000000
FS:  00007f5038f10800 GS:  0000000000000000