On 12/5/23 11:22, Greg Kroah-Hartman wrote:
This is the start of the stable review cycle for the 5.4.263 release. There are 90 patches in this series, all will be posted as a response to this one. If anyone has any issues with these being applied, please let me know.
Responses should be made by Thu, 07 Dec 2023 18:32:16 +0000. Anything received after that time might be too late.
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Qu Wenruo wqu@suse.com btrfs: add dmesg output for first mount and last unmount of a filesystem
This patch results in the following code in fs/btrfs/disk-io.c:open_ctree():
struct btrfs_super_block *disk_super; ... (no access to disk_super) btrfs_info(fs_info, "first mount of filesystem %pU", disk_super->fsid);
which I would assume _should_ result in btrfs crashes. No idea why that isn't actually happening or why gcc doesn't complain. Building allmodconfig with clang does complain, but doesn't bail out.
s/btrfs/disk-io.c:2832:55: warning: variable 'disk_super' is uninitialized when used here [-Wuninitialized] btrfs_info(fs_info, "first mount of filesystem %pU", disk_super->fsid); ^~~~~~~~~~
The actual log output is:
[ 7.302427] BTRFS info (device nvme0n1): first mount of filesystem (efault)
It might be a good idea to either revert this patch or fix it up (though I don't know how to fix it up).
Guenter