CVE-2021-47510 — btrfs: fix re-dirty process of tree-log nodes

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix re-dirty process of tree-log nodes

There is a report of a transaction abort of -EAGAIN with the following script.

#!/bin/sh

for d in sda sdb; do mkfs.btrfs -d single -m single -f /dev/\${d} done

mount /dev/sda /mnt/test mount /dev/sdb /mnt/scratch

for dir in test scratch; do echo 3 >/proc/sys/vm/drop_caches fio --directory=/mnt/\${dir} --name=fio.\${dir} --rw=read --size=50G --bs=64m \ --numjobs=$(nproc) --time_based --ramp_time=5 --runtime=480 \ --group_reporting |& tee /dev/shm/fio.\${dir} echo 3 >/proc/sys/vm/drop_caches done

for d in sda sdb; do umount /dev/\${d} done

The stack trace is shown in below.

[3310.967991] BTRFS: error (device sda) in btrfs_commit_transaction:2341: errno=-11 unknown (Error while writing out transaction) [3310.968060] BTRFS info (device sda): forced readonly [3310.968064] BTRFS warning (device sda): Skipping commit of aborted transaction. [3310.968065] ------------[ cut here ]------------ [3310.968066] BTRFS: Transaction aborted (error -11) [3310.968074] WARNING: CPU: 14 PID: 1684 at fs/btrfs/transaction.c:1946 btrfs_commit_transaction.cold+0x209/0x2c8 [3310.968131] CPU: 14 PID: 1684 Comm: fio Not tainted 5.14.10-300.fc35.x86_64 #1 [3310.968135] Hardware name: DIAWAY Tartu/Tartu, BIOS V2.01.B10 04/08/2021 [3310.968137] RIP: 0010:btrfs_comm…

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CVE-2021-47510 — btrfs: fix re-dirty process of tree-log nodes