tree a812244408096e23b2a64cb6402cd19befe82f37
parent 9b2f20344d450137d015b380ff0c2e2a6a170135
author David Sterba <dsterba@suse.com> 1667482741 +0100
committer David Sterba <dsterba@suse.com> 1667828097 +0100

btrfs: don't print stack trace when transaction is aborted due to ENOMEM

Add ENOMEM among the error codes that don't print stack trace on
transaction abort. We've got several reports from syzbot that detects
stacks as errors but caused by limiting memory. As this is an artificial
condition we don't need to know where exactly the error happens, the
abort and error cleanup will continue like e.g. for EIO.

As the transaction aborts code needs to be inline in a lot of code, the
implementation cases about minimal bloat. The error codes are in a
separate function and the WARN uses the condition directly. This
increases the code size by 571 bytes on release build.

Alternatives considered: add -ENOMEM among the errors, this increases
size by 2340 bytes, various attempts to combine the WARN and helper
calls, increase by 700 or more bytes.

Example syzbot reports (error -12):

- https://syzkaller.appspot.com/bug?extid=5244d35be7f589cf093e
- https://syzkaller.appspot.com/bug?extid=9c37714c07194d816417

Signed-off-by: David Sterba <dsterba@suse.com>