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SubjectRe: [PATCH] Add process name to locks warning
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On 11/18/2022 6:06 PM, Jeff Layton wrote:
> On Fri, 2022-11-18 at 15:43 -0800, Andi Kleen wrote:
>> It's fairly useless to complain about using an obsolete feature without
>> telling the user which process used it. My Fedora desktop randomly drops
>> this message, but I would really need this patch to figure out what
>> triggers is.
>>
> Interesting. The only program I know of that tried to use these was
> samba, but we patched that out a few years ago (about the time this
> patch went in). Are you running an older version of samba?


Yes it's running samba, whatever is in Fedora 35. Don't know if that
counts as an

older version.


>
>> Signed-off-by: Andi Kleen <ak@linux.intel.com>
>> ---
>> fs/locks.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/locks.c b/fs/locks.c
>> index 607f94a0e789..2e45232dbeb1 100644
>> --- a/fs/locks.c
>> +++ b/fs/locks.c
>> @@ -2096,7 +2096,7 @@ SYSCALL_DEFINE2(flock, unsigned int, fd, unsigned int, cmd)
>> * throw a warning to let people know that they don't actually work.
>> */
>> if (cmd & LOCK_MAND) {
>> - pr_warn_once("Attempt to set a LOCK_MAND lock via flock(2). This support has been removed and the request ignored.\n");
>> + pr_warn_once("%s: Attempt to set a LOCK_MAND lock via flock(2). This support has been removed and the request ignored.\n", current->comm);
>> return 0;
>> }
>>
> Looks reasonable. Would it help to print the pid or tgid as well?

It wouldn't help me because at that time I see it it's likely long gone.
Just need the name.

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