Control: reassign -1 liblockfile1 1.09-5
Control: affects -1 + sendmail-bin
On 2014-01-25 22:28, Paul Szabo wrote:
> The wheezy mail.local is unable to deliver mail. I was getting syslog
> lines like:
>
> Jan 26 07:41:37 bari mail.local[11136]: lockmailbox psz failed; error code 75
> Jan 26 07:41:37 bari sm-mta[11135]: s0PKfb67011134:
> to=<p...@bari.maths.usyd.edu.au>, delay=00:00:00, xdelay=00:00:00,
> mailer=local, pri=30977, dsn=4.0.0, stat=Deferred: local mailer
> (/usr/lib/sm.bin/mail.local) exited with EX_TEMPFAIL
>
> Looking into the problem with strace, I noticed that running mail.local
> with "strace -f" allowed it to succeed. A possible workaround is to move
sounds like a race condition, strace will change the timing ...
> The following short C code demonstrates the issue.
>
>
> /*
> Testing with code mimicking sendmail mail.local .
> Compile with
> cc mytest.c -llockfile
> Fails when running "plain" or with strace, but succeeds
> when running with strace -f as shown below:
> root# ./a.out
> lockmailbox psz code 2 errno=1
> root# strace -o outx ./a.out
> lockmailbox psz code 2 errno=1
> root# strace -o outy -f ./a.out
> root#
> Another oddity: in the output of "strace -f" I see
> geteuid32() return 0 within the children (in the execed
> /usr/bin/dotlockfile): should not that return 1001?
> */
>
> #include <stdlib.h>
> #include <unistd.h>
> #include <stdio.h>
> #include <errno.h>
> #include <maillock.h>
>
> int
> main(argc, argv)
> int argc;
> char *argv[];
> {
> /* name and UID of some plain user */
> char *p = "psz";
> uid_t uid = 1001;
>
> int off;
>
> /* use a reasonable umask */
> (void) umask(0077);
>
> /* change UID for quota checks */
> if (setreuid(0, uid) < 0)
> {
> printf("450 setreuid(0, %d) errno=%d (r=%d, e=%d)\n",
> (int) uid, errno, (int) getuid(), (int) geteuid());
> exit(1);
> }
>
> if ((off = maillock(p, 15)) != 0)
> {
> printf("lockmailbox %s code %d errno=%d\n", p, off, errno);
> }
>
> mailunlock();
> }
Thanks for the testcase. Reassigning to liblockfile.
Andreas
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