INFO: task kmmpd-loop5:7632 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kmmpd-loop5     state:D stack:0     pid:7632  tgid:7632  ppid:2      task_flags:0x208040 flags:0x00000010
Call trace:
 __switch_to+0x414/0x834 arch/arm64/kernel/process.c:735 (T)
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x13b0/0x28d4 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xb4/0x230 kernel/sched/core.c:6860
 io_schedule+0x84/0xf0 kernel/sched/core.c:7742
 bit_wait_io+0x1c/0xac kernel/sched/wait_bit.c:247
 __wait_on_bit kernel/sched/wait_bit.c:49 [inline]
 out_of_line_wait_on_bit+0x158/0x1f0 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:105 [inline]
 __wait_on_buffer+0x6c/0x7c fs/buffer.c:123
 wait_on_buffer include/linux/buffer_head.h:422 [inline]
 write_mmp_block_thawed+0x208/0x2dc fs/ext4/mmp.c:52
 write_mmp_block+0x1d0/0x5dc fs/ext4/mmp.c:67
 kmmpd+0x2ec/0x9b8 fs/ext4/mmp.c:178
 kthread+0x5fc/0x75c kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847

Showing all locks held in the system:
1 lock held by kthreadd/2:
8 locks held by kworker/R-netns/8:
 #0: ffff0000c183a148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212
 #1: ffff800097617ba0 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212
 #2: ffff800092481e50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x138/0x9c0 net/core/net_namespace.c:608
 #3: ffff0000cbb220e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
 #3: ffff0000cbb220e8 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline]
 #3: ffff0000cbb220e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0xe4/0x380 net/devlink/core.c:506
 #4: ffff0000ed43e250 (&devlink->lock_key#6){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:276 [inline]
 #4: ffff0000ed43e250 (&devlink->lock_key#6){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline]
 #4: ffff0000ed43e250 (&devlink->lock_key#6){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0xf0/0x380 net/devlink/core.c:506
 #5: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
 #6: ffff0000ee670d38 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline]
 #6: ffff0000ee670d38 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x470/0x1fbc net/core/dev.c:11931
 #7: ffff800092520e28 (flowtable_lock){+.+.}-{4:4}, at: nf_flow_table_cleanup+0x30/0xd0 net/netfilter/nf_flow_table_core.c:740
3 locks held by kworker/u8:0/12:
3 locks held by kworker/u8:1/13:
3 locks held by kworker/1:1/26:
1 lock held by khungtaskd/32:
 #0: ffff80008f508920 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330
3 locks held by kworker/u8:2/40:
2 locks held by kworker/0:1H/41:
 #0: ffff0000c20b6548 ((wq_completion)kblockd){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212
 #1: ffff800097d27bc0 ((work_completion)(&q->timeout_work)){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212
3 locks held by kworker/u8:3/45:
5 locks held by kworker/u8:4/122:
3 locks held by kworker/u8:5/260:
3 locks held by kworker/u8:6/338:
3 locks held by kworker/u8:7/2235:
3 locks held by kworker/R-ipv6_/4139:
 #0: ffff0000d3493948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212
 #1: ffff8000a21f7ba0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212
 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80
2 locks held by kworker/R-bat_e/4220:
1 lock held by klogd/6092:
2 locks held by udevd/6103:
1 lock held by crond/6232:
2 locks held by getty/6255:
 #0: ffff0000d7b920a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff80009b5fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa0 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/6487:
1 lock held by syz-executor/6490:
3 locks held by kworker/u8:8/6609:
1 lock held by syz-executor/6788:
 #0: ffff0000c260c0e0 (&type->s_umount_key#30){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff0000c260c0e0 (&type->s_umount_key#30){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff0000c260c0e0 (&type->s_umount_key#30){++++}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:505
3 locks held by kworker/u8:9/6852:
3 locks held by kworker/u8:10/6853:
2 locks held by kworker/u8:11/6854:
4 locks held by udevd/7176:
2 locks held by syz.4.175/7590:
 #0: ffff80008fc26ea8 (bio_slab_lock){+.+.}-{4:4}, at: bio_put_slab block/bio.c:140 [inline]
 #0: ffff80008fc26ea8 (bio_slab_lock){+.+.}-{4:4}, at: bioset_exit+0x1f8/0x3dc block/bio.c:1664