Bug 202173 - Btrfs deadlock calling leaf_space_used() and btrfs_tree_read_lock()
Summary: Btrfs deadlock calling leaf_space_used() and btrfs_tree_read_lock()
Status: RESOLVED CODE_FIX
Alias: None
Product: File System
Classification: Unclassified
Component: btrfs (show other bugs)
Hardware: All Linux
: P1 high
Assignee: BTRFS virtual assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-01-07 19:13 UTC by Eli V
Modified: 2019-01-08 16:17 UTC (History)
1 user (show)

See Also:
Kernel Version: 4.19.12
Subsystem:
Regression: No
Bisected commit-id:

Attachments
dmesg stack traces just before deadlock (16.58 KB, text/plain)
2019-01-07 19:14 UTC, Eli V 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Eli V 2019-01-07 19:13:32 UTC 
Running an rsync process writing to the btrfs filesystem deadlocked with a bunch of kworkers in leaf_space_used and one in btrfs_tree_read_lock(). The first stack trace in the attched file, hitting btrfs_lock_root_node(), was about 2 minutes before the deadlock when all activity on the filesystem stopped.
Comment 1 Eli V 2019-01-07 19:14:19 UTC 
Created attachment 280299 [details]
dmesg stack traces just before deadlock
Comment 2 David Sterba 2019-01-08 16:17:24 UTC 
Thanks for the report. Fix https://patchwork.kernel.org/patch/10751909/ will go to 5.0-rc and then to stable 4.19.x.
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