INFO: task kworker/u8:10:6939 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc1-syzkaller-g2014c95afece #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:10   state:D stack:0     pid:6939  tgid:6939  ppid:2      task_flags:0x4208060 flags:0x00000008
Workqueue: writeback wb_workfn (flush-7:3)
Call trace:
 __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T)
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0x1360/0x257c kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xbc/0x238 kernel/sched/core.c:6856
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6913
 rwsem_down_write_slowpath+0xd10/0x14c8 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0xb4/0xc0 kernel/locking/rwsem.c:1578
 f2fs_down_write fs/f2fs/f2fs.h:2191 [inline]
 f2fs_balance_fs+0x4a8/0x704 fs/f2fs/segment.c:454
 f2fs_write_inode+0x33c/0x5fc fs/f2fs/inode.c:803
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x5a0/0x15a4 fs/fs-writeback.c:1745
 writeback_sb_inodes+0x650/0x1088 fs/fs-writeback.c:1976
 __writeback_inodes_wb+0xec/0x234 fs/fs-writeback.c:2047
 wb_writeback+0x3f4/0xe9c fs/fs-writeback.c:2158
 wb_check_old_data_flush fs/fs-writeback.c:2262 [inline]
 wb_do_writeback fs/fs-writeback.c:2315 [inline]
 wb_workfn+0xb9c/0x1048 fs/fs-writeback.c:2343
 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3317 [inline]
 worker_thread+0x97c/0xeec kernel/workqueue.c:3398
 kthread+0x65c/0x7b0 kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862

Showing all locks held in the system:
3 locks held by kworker/u8:0/11:
1 lock held by khungtaskd/31:
 #0: ffff80008fdb1ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:336
4 locks held by kworker/u8:3/44:
 #0: ffff0000c1899948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3210
 #1: ffff8000993a7ba0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3210
 #2: ffff800092b58dd0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x148/0xa48 net/core/net_namespace.c:606
 #3: ffff800092b652a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79
2 locks held by kworker/u8:7/628:
 #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3210
 #1: ffff80009cfc7ba0 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3210
2 locks held by getty/6202:
 #0: ffff0000d299b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009bc9e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2211
7 locks held by syz.3.28/6682:
4 locks held by kworker/u8:10/6939:
 #0: ffff0000c207e948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x60c/0x15cc kernel/workqueue.c:3210
 #1: ffff8000a40a7ba0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a4/0x15cc kernel/workqueue.c:3210
 #2: ffff0000cc9d40e0 (&type->s_umount_key#58){++++}-{4:4}, at: super_trylock_shared+0x28/0xe4 fs/super.c:562
 #3: ffff0000c68fd350 (&sbi->gc_lock){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2191 [inline]
 #3: ffff0000c68fd350 (&sbi->gc_lock){+.+.}-{4:4}, at: f2fs_balance_fs+0x4a8/0x704 fs/f2fs/segment.c:454
1 lock held by syz-executor/7678:
 #0: ffff80008fdb6ec0 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x58/0x534 kernel/rcu/tree.c:3741
1 lock held by syz-executor/7684:
 #0: ffff80008fdb6ff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:334 [inline]
 #0: ffff80008fdb6ff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x324/0x674 kernel/rcu/tree_exp.h:996
1 lock held by syz-executor/8526:
 #0: ffff800092b652a8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:79
1 lock held by syz-executor/8551:
 #0: ffff800092b58dd0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x290/0x4ac net/core/net_namespace.c:512

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