Bug 964008 - Segmention fault in journalctl
Segmention fault in journalctl
Product: Fedora
Classification: Fedora
Component: systemd (Show other bugs)
x86_64 Linux
unspecified Severity medium
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Assigned To: Michal Schmidt
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-05-16 23:18 EDT by David Strauss
Modified: 2013-08-01 14:38 EDT (History)
9 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2013-08-01 14:38:06 EDT
Type: Bug
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Description David Strauss 2013-05-16 23:18:43 EDT
This code may be completely different in current journalctl implementations, but here's what I found. Presumably, f->path could be NULL at the time this log item tries to print.

[straussd@endpoint21d5d347 tmp]$ sudo gdb -ex "set pagination 0" -ex "thread apply all bt" -batch `which journalctl` coredump.journalctl.18997.endpoint21d5d347.1367282164
[New LWP 18997]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `journalctl -o json -f'.
Program terminated with signal 11, Segmentation fault.
#0  remove_file (j=j@entry=0x25d4010, prefix=prefix@entry=0x25e3130 "/run/log/journal/05046d45ef454d85af397025b312cff6", filename=filename@entry=0x7fff0f05db20 "system@201ef05c466b406c850e566a32d5b798-0000000000f1db50-0004db85e667f988.journal", dir=0x0) at src/journal/sd-journal.c:1018
1018	        log_debug("File %s got removed.", f->path);

Thread 1 (Thread 0x7f6eaa97c780 (LWP 18997)):
#0  remove_file (j=j@entry=0x25d4010, prefix=prefix@entry=0x25e3130 "/run/log/journal/05046d45ef454d85af397025b312cff6", filename=filename@entry=0x7fff0f05db20 "system@201ef05c466b406c850e566a32d5b798-0000000000f1db50-0004db85e667f988.journal", dir=0x0) at src/journal/sd-journal.c:1018
#1  0x0000003e0d60564b in process_inotify_event (e=<optimized out>, j=<optimized out>) at src/journal/sd-journal.c:1565
#2  sd_journal_process (j=0x25d4010) at src/journal/sd-journal.c:1644
#3  0x000000000040292e in main (argc=<optimized out>, argv=<optimized out>) at src/journal/journalctl.c:368
Comment 1 David Strauss 2013-05-16 23:20:16 EDT
Here's the version that box has installed.

Installed Packages
Name        : systemd
Arch        : x86_64
Version     : 44
Release     : 24.fc17
Comment 2 David Strauss 2013-05-16 23:21:32 EDT
Correction: Presumably, f could be NULL at the time this log item tries to print. The printf-like functionality behind log_debug will work around f->path being NULL if f isn't.
Comment 3 Michal Schmidt 2013-05-17 04:44:07 EDT
We cannot access f->path after journal_file_close(f). This got fixed upstream in:

commit 44a5fa34d9f9a5050cdf4a497e6ccf5af2d1678d
Author: Lennart Poettering <lennart@poettering.net>
Date:   Tue Oct 16 22:59:28 2012 +0200

    sd-journal: fix bad memory access
Comment 4 Fedora End Of Life 2013-07-04 02:57:21 EDT
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Comment 5 Fedora End Of Life 2013-08-01 14:38:11 EDT
Fedora 17 changed to end-of-life (EOL) status on 2013-07-30. Fedora 17 is 
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