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[Bug nptl/4578] New: Assertion `...r_state == RT_CONSISTENT' failed!
- From: "larry dot stewart at sicortex dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 31 May 2007 18:58:42 -0000
- Subject: [Bug nptl/4578] New: Assertion `...r_state == RT_CONSISTENT' failed!
- Reply-to: sourceware-bugzilla at sourceware dot org
We hit an assertion in ld.so about every 6000 runs of the cluster manager
slurmstepd on SiCortex hardware. This is evidently the same bug as
http://www.redhat.com/archives/phil-list/2003-December/msg00008.html
Evidently it has reappeared because of ld.so consistency checking and
because our chip (6 way SMP at 500 MHz) has a wider window of vulnerability.
We've adapted the previously reported test case so that it fails about half the
time (attached) and developed a patch (attached) that resolves the problem.
The test case doesn't fail for us on opterons, the only other systems we have
available.
The failure message we get on our machines is:
Inconsistency detected by ld.so: dl-open.c: 215: dl_open_worker: Assertion
`_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT' failed!
Details:
If a thread happens to hold dl_load_lock and have r_state set to RT_ADD or
RT_DELETE at the time another thread calls fork(), then the child exit code
from fork (in nptl/sysdeps/unix/sysv/linux/fork.c in our case) re-initializes
dl_load_lock but does not restore r_state to RT_CONSISTENT. If the child
subsequently requires ld.so functionality before calling exec(), then the
assertion will fire.
The patch acquires dl_load_lock on entry to fork() and releases it on exit
from the parent path. The child path is initialized as currently done.
This is essentially pthreads_atfork, but forced to be first because the
acquisition of dl_load_lock must happen before malloc_atfork is active
to avoid a deadlock.
--
Summary: Assertion `...r_state == RT_CONSISTENT' failed!
Product: glibc
Version: 2.3.5
Status: NEW
Severity: normal
Priority: P2
Component: nptl
AssignedTo: drepper at redhat dot com
ReportedBy: larry dot stewart at sicortex dot com
CC: glibc-bugs at sources dot redhat dot com
GCC host triplet: mips64-linux-gnu
http://sourceware.org/bugzilla/show_bug.cgi?id=4578
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