linux-kernel - Re: [PATCH 0/6] locking/rwsem: Rework writer wakeup and handoff

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Date:   Fri, 24 Feb 2023 12:55:09 +0100
From:   Jiri Wiesner <jwiesner@...e.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Waiman Long <longman@...hat.com>, mingo@...hat.com,
        will@...nel.org, linux-kernel@...r.kernel.org, boqun.feng@...il.com
Subject: Re: [PATCH 0/6] locking/rwsem: Rework writer wakeup and handoff

On Thu, Feb 23, 2023 at 08:19:46PM -0500, Waiman Long wrote:
> On 2/23/23 07:26, Peter Zijlstra wrote:
> > Hi,
> > 
> > these here few patches boot but are otherwise very much untested. Please test.
> 
> However, I got the following task hanging message when doing a kernel build:
> [ 2215.895252] INFO: task pahole:65220 blocked for more than 123 seconds.

I was running locktorture and ran into the same problem as Waiman. It's unrelated to the locktorture workload, though:

[ 1482.886856] INFO: task btrfs-transacti:1073 blocked for more than 491 seconds.
[ 1482.895755]       Tainted: G            E      6.2.0-pz1 #1
[ 1482.912382] task:btrfs-transacti state:D stack:0     pid:1073  ppid:2      flags:0x00004000
[ 1482.922544] Call Trace:
[ 1482.926074]  <TASK>
[ 1482.929211]  __schedule+0x3c0/0x1360
[ 1482.954121]  schedule+0x5c/0xc0
[ 1482.958428]  schedule_preempt_disabled+0x11/0x20
[ 1482.964396]  rwsem_down_write_slowpath+0x17c/0x580
[ 1482.975260]  down_write+0x57/0x60
[ 1482.979763]  __btrfs_tree_lock+0x17/0x90 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1482.989779]  btrfs_lock_root_node+0x3b/0x90 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.000082]  btrfs_search_slot+0x2b7/0xc70 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.010267]  btrfs_lookup_file_extent+0x4a/0x70 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.020949]  btrfs_drop_extents+0x12e/0xf20 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.031252]  insert_reserved_file_extent+0xec/0x2e0 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.053705]  insert_prealloc_file_extent+0xb9/0x1b0 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.064774]  __btrfs_prealloc_file_range+0x12c/0x420 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.075941]  cache_save_setup+0x26d/0x3d0 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.086052]  btrfs_setup_space_cache+0x9c/0xc0 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.096648]  commit_cowonly_roots+0xd9/0x279 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.107046]  btrfs_commit_transaction+0x8e2/0xe70 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.128221]  transaction_kthread+0x14e/0x1b0 [btrfs a6f0f85f39d8ec2ab376bf2ae3a09f935847037e]
[ 1483.149588]  kthread+0xd7/0x100
[ 1483.158891]  ret_from_fork+0x29/0x50
[ 1483.163689]  </TASK>

-- 
Jiri Wiesner
SUSE Labs