INFO: task kworker/u4:8:4203 blocked for more than 143 seconds.
      Not tainted 5.15.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:8    state:D stack:    0 pid: 4203 ppid:     2 flags:0x00000008
Workqueue: writeback wb_workfn (flush-7:1)
Call trace:
 __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0xe00/0x1c0c kernel/sched/core.c:6376
 schedule+0x11c/0x1c8 kernel/sched/core.c:6459
 rwsem_down_write_slowpath+0xcb8/0x13f4 kernel/locking/rwsem.c:1165
 __down_write_common kernel/locking/rwsem.c:1292 [inline]
 __down_write kernel/locking/rwsem.c:1301 [inline]
 down_write+0xe8/0x12c kernel/locking/rwsem.c:1552
 f2fs_balance_fs+0x3a4/0x650 fs/f2fs/segment.c:528
 f2fs_write_inode+0x3f4/0x598 fs/f2fs/inode.c:738
 write_inode fs/fs-writeback.c:1495 [inline]
 __writeback_single_inode+0x560/0x11f0 fs/fs-writeback.c:1705
 writeback_sb_inodes+0x7fc/0x1378 fs/fs-writeback.c:1930
 __writeback_inodes_wb+0x110/0x394 fs/fs-writeback.c:2001
 wb_writeback+0x3ec/0xe44 fs/fs-writeback.c:2106
 wb_check_background_flush fs/fs-writeback.c:2172 [inline]
 wb_do_writeback fs/fs-writeback.c:2260 [inline]
 wb_workfn+0xa7c/0xdd8 fs/fs-writeback.c:2288
 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310
 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457
 kthread+0x374/0x454 kernel/kthread.c:334
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855

Showing all locks held in the system:
3 locks held by kworker/1:0/21:
2 locks held by kworker/1:1/25:
1 lock held by khungtaskd/27:
 #0: ffff800014341360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311
8 locks held by kworker/u4:1/136:
 #0: ffff0000c038c138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff80001bd77c00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff800016290910 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x12c/0xa98 net/core/net_namespace.c:589
 #3: ffff8000162c1f28 (devlink_mutex){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x98/0x33c net/core/devlink.c:11534
 #4: ffff0000ca448670 (&nsim_bus_dev->nsim_bus_reload_lock){+.+.}-{3:3}, at: nsim_dev_reload_down+0x54/0x154 drivers/net/netdevsim/dev.c:870
 #5: ffff0000ca449400 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1359 [inline]
 #5: ffff0000ca449400 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_reload_destroy+0xf4/0x204 drivers/net/netdevsim/dev.c:1561
 #6: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:72
 #7: ffff800014345e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #7: ffff800014345e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2f0/0x5e0 kernel/rcu/tree_exp.h:845
3 locks held by kworker/0:2/3335:
 #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff800021167c00 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000ca449400 (&nsim_dev->port_list_lock){+.+.}-{3:3}, at: nsim_dev_trap_report_work+0x5c/0x938 drivers/net/netdevsim/dev.c:757
2 locks held by getty/3817:
 #0: ffff0000d5009098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340
 #1: ffff80001bd6e2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158
4 locks held by kworker/u4:8/4203:
 #0: ffff0000c207b938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff80001fdb7c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
 #2: ffff0000d94a20e0 (&type->s_umount_key#73){++++}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:418
 #3: ffff0000c111d1b0 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3a4/0x650 fs/f2fs/segment.c:528
2 locks held by kworker/1:7/4424:
 #0: ffff0000c0021938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283
 #1: ffff800020327c00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285
5 locks held by syz.1.81/4527:
2 locks held by kworker/u4:9/4769:
4 locks held by syz-executor/8139:
 #0: ffff0000d525a460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xa2c fs/read_write.c:590
 #1: ffff0000e908b888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c0/0x478 fs/kernfs/file.c:287
 #2: ffff0000ce2c4918 (kn->active#236){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1dc/0x478 fs/kernfs/file.c:288
 #3: ffff80001586c388 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x128/0x59c drivers/net/netdevsim/bus.c:295
6 locks held by syz-executor/8200:
 #0: ffff0000d525a460 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x228/0xa2c fs/read_write.c:590
 #1: ffff0000e9c9e888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1c0/0x478 fs/kernfs/file.c:287
 #2: ffff0000ce2c4a00 (kn->active#235){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1dc/0x478 fs/kernfs/file.c:288
 #3: ffff80001586c388 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xd4/0x33c drivers/net/netdevsim/bus.c:344
 #4: ffff0000ca52c178 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline]
 #4: ffff0000ca52c178 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1044 [inline]
 #4: ffff0000ca52c178 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0x9c/0x63c drivers/base/dd.c:1259
 #5: ffff8000162c1f28 (devlink_mutex){+.+.}-{3:3}, at: devlink_reload_disable+0x28/0x88 net/core/devlink.c:9019
1 lock held by syz-executor/8246:
 #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x98c/0xd04 net/core/rtnetlink.c:5647
1 lock held by syz-executor/8320:
 #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffff80001629c1e8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x98c/0xd04 net/core/rtnetlink.c:5647
2 locks held by syz.1.624/8364:

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