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From: Yaohui Hu <yhu@digitalocean.com>
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Subject: Re: md_raid: mdX_raid6 looping after sync_action "check" to "idle"
 transition
Message-Id: <E5A94FC9-E0E4-4A82-AA51-CBFC766231A4@digitalocean.com>
Date: Thu, 30 May 2024 01:12:04 -0700
Cc: buczek@molgen.mpg.de,
 dragan@stancevic.com,
 guoqing.jiang@linux.dev,
 it+raid@molgen.mpg.de,
 linux-kernel@vger.kernel.org,
 linux-raid@vger.kernel.org,
 msmith626@gmail.com,
 song@kernel.org,
 yangerkun@huawei.com,
 yukuai3@huawei.com
To: yukuai1@huaweicloud.com

Hi,

After applied suggested 7 commits to kernel v6.1. There are still =
deadlocks in raid456 such as following. Do we have other follow up patch =
to fix this issue?=20

[2378440.310330] INFO: task systemd-journal:1415 blocked for more than =
120 seconds.
[2378440.318649]       Tainted: G           OE K    =
6.1.51-0digitalocean2-generic #0digitalocean2
[2378440.328327] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" =
disables this message.
[2378440.337306] task:systemd-journal state:D stack:0     pid:1415  =
ppid:1      flags:0x00000006
[2378440.337310] Call Trace:
[2378440.337312]  <TASK>
[2378440.337315]  __schedule+0x1f5/0x5c0
[2378440.337324]  schedule+0x53/0xb0
[2378440.337327]  io_schedule+0x42/0x70
[2378440.337329]  folio_wait_bit_common+0x11f/0x310
[2378440.337335]  ? filemap_invalidate_unlock_two+0x40/0x40
[2378440.337338]  ? ext4_da_map_blocks.constprop.0+0x370/0x370
[2378440.337342]  block_page_mkwrite+0x113/0x160
[2378440.337346]  ext4_page_mkwrite+0x233/0x6d0
[2378440.337349]  do_page_mkwrite+0x4d/0xe0
[2378440.337352]  do_wp_page+0x1d9/0x440
[2378440.337355]  __handle_mm_fault+0x50a/0x5d0
[2378440.337358]  handle_mm_fault+0xe3/0x2e0
[2378440.337359]  do_user_addr_fault+0x187/0x560
[2378440.337363]  exc_page_fault+0x6c/0x150
[2378440.337366]  asm_exc_page_fault+0x22/0x30
[2378440.337371] RIP: 0033:0x7f2b4b7c9e7a
[2378440.337377] RSP: 002b:00007ffcd6387340 EFLAGS: 00010202
[2378440.337379] RAX: 0000000004725c68 RBX: 000056420cb077f0 RCX: =
00007f2b3a7983b0
[2378440.337381] RDX: 00007f2b3fb25c68 RSI: 000056420cb077f0 RDI: =
00007f2b3a7983d8
[2378440.337382] RBP: 000056420caca8f0 R08: 00000000003983b0 R09: =
00007ffcd6387370
[2378440.337383] R10: 86c0275e98fea605 R11: 0000000000244a4c R12: =
000000000000000a
[2378440.337384] R13: e4bdb9e57ca6925c R14: 0000000000000000 R15: =
00007ffcd6387378
[2378440.337386]  </TASK>
[2378440.337587] INFO: task md8_resync:3952093 blocked for more than 120 =
seconds.
[2378440.345699]       Tainted: G           OE K    =
6.1.51-0digitalocean2-generic #0digitalocean2
[2378440.355371] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" =
disables this message.
[2378440.364359] task:md8_resync      state:D stack:0     pid:3952093 =
ppid:2      flags:0x00004000
[2378440.364362] Call Trace:
[2378440.364363]  <TASK>
[2378440.364364]  __schedule+0x1f5/0x5c0
[2378440.364368]  schedule+0x53/0xb0
[2378440.364372]  raid5_get_active_stripe+0x1f6/0x290 [raid456]
[2378440.364381]  ? destroy_sched_domains_rcu+0x30/0x30
[2378440.364385]  raid5_sync_request+0x289/0x2c0 [raid456]
[2378440.364392]  ? is_mddev_idle+0xb5/0x115
[2378440.364395]  md_do_sync.cold+0x3eb/0x96b
[2378440.364398]  ? destroy_sched_domains_rcu+0x30/0x30
[2378440.364400]  md_thread+0xa9/0x160
[2378440.364406]  ? super_90_load.part.0+0x300/0x300
[2378440.364408]  kthread+0xb9/0xe0
[2378440.364412]  ? kthread_complete_and_exit+0x20/0x20
[2378440.364414]  ret_from_fork+0x1f/0x30
[2378440.364418]  </TASK>

Thanks=