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* [Bug nptl/19004] New: tst-robust8 fails intermittently on x86_64
@ 2015-09-25 8:50 fweimer at redhat dot com
2015-09-25 8:54 ` [Bug nptl/19004] " fweimer at redhat dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2015-09-25 8:50 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=19004
Bug ID: 19004
Summary: tst-robust8 fails intermittently on x86_64
Product: glibc
Version: 2.23
Status: NEW
Severity: normal
Priority: P2
Component: nptl
Assignee: unassigned at sourceware dot org
Reporter: fweimer at redhat dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Flags: security-
The test machine is an x86_64 machine running the 3.10 kernel from Red Hat
Enterprise Linux 7, two Xeon E5-2450 CPUs with 8 cores each, for a total number
of 32 hardware threads.
I can reproduce this with 2.23 master as of today, but I have trouble getting
proper backtraces because I cannot get GDB to use the right libthread_db, so I
am not completely certain the observation below applies to glibc master.
With the glibc 2.17 in Red Hat Enterprise Linux 7, this pthread_mutex_lock call
blocks indefinitely:
232 for (int n = 0; n < N; ++n)
233 {
234 int e = pthread_mutex_lock (&map[n]);
235 if (e != 0 && e != EOWNERDEAD)
Sometimes, this happens on the first round, sometimes on subsequent rounds.
(gdb) print/x map[n]
$4 = {__data = {__lock = 0x80000000, __count = 0x1, __owner = 0x0,
__nusers = 0x0, __kind = 0x90, __spins = 0x0, __list = {__prev = 0x0,
__next = 0x0}}, __size = {0x0, 0x0, 0x0, 0x80, 0x1,
0x0 <repeats 11 times>, 0x90, 0x0 <repeats 23 times>},
__align = 0x180000000}
(gdb) print/x map[n-1]
$5 = {__data = {__lock = 0x800052b0, __count = 0x1, __owner = 0x7fffffff,
__nusers = 0x1, __kind = 0x90, __spins = 0x0, __list = {
__prev = 0x7ffff7feca20, __next = 0x7ffff7ff8480}}, __size = {0xb0,
0x52, 0x0, 0x80, 0x1, 0x0, 0x0, 0x0, 0xff, 0xff, 0xff, 0x7f, 0x1, 0x0,
0x0, 0x0, 0x90, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x20, 0xca, 0xfe,
0xf7, 0xff, 0x7f, 0x0, 0x0, 0x80, 0x84, 0xff, 0xf7, 0xff, 0x7f, 0x0,
0x0}, __align = 0x1800052b0}
(gdb) print/x map[n+1]
$7 = {__data = {__lock = 0x40000000, __count = 0x1, __owner = 0x52b3,
__nusers = 0x1, __kind = 0x90, __spins = 0x0, __list = {
__prev = 0x7ffff7ff8200, __next = 0x7ffff7ff8138}}, __size = {0x0,
0x0, 0x0, 0x40, 0x1, 0x0, 0x0, 0x0, 0xb3, 0x52, 0x0, 0x0, 0x1, 0x0, 0x0,
0x0, 0x90, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x82, 0xff, 0xf7,
0xff, 0x7f, 0x0, 0x0, 0x38, 0x81, 0xff, 0xf7, 0xff, 0x7f, 0x0, 0x0},
__align = 0x140000000}
(gdb) print/x map[n+2]
$8 = {__data = {__lock = 0xc0000000, __count = 0x1, __owner = 0x52ba,
__nusers = 0x1, __kind = 0x90, __spins = 0x0, __list = {
__prev = 0x7ffff7ff8d18, __next = 0x7ffff7ff8250}}, __size = {0x0,
0x0, 0x0, 0xc0, 0x1, 0x0, 0x0, 0x0, 0xba, 0x52, 0x0, 0x0, 0x1, 0x0, 0x0,
0x0, 0x90, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x18, 0x8d, 0xff, 0xf7,
0xff, 0x7f, 0x0, 0x0, 0x50, 0x82, 0xff, 0xf7, 0xff, 0x7f, 0x0, 0x0},
__align = 0x1c0000000}
I don't know enough about futexes to debug this further.
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* [Bug nptl/19004] tst-robust8 fails intermittently on x86_64
2015-09-25 8:50 [Bug nptl/19004] New: tst-robust8 fails intermittently on x86_64 fweimer at redhat dot com
@ 2015-09-25 8:54 ` fweimer at redhat dot com
2015-09-25 9:45 ` fweimer at redhat dot com
2020-04-28 17:08 ` carlos at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2015-09-25 8:54 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=19004
--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
Full backtrace:
#1 0x00007ffff7bc4d7c in _L_robust_lock_205 () at pthread_mutex_lock.c:478
No symbol table info available.
#2 0x00007ffff7bc4a05 in __pthread_mutex_lock_full (mutex=0x7ffff7ff84b0)
at pthread_mutex_lock.c:225
result = <optimized out>
oldval = <optimized out>
id = 21168
#3 0x00007ffff7bc8c1a in __GI___pthread_mutex_lock (mutex=<optimized out>)
at pthread_mutex_lock.c:55
type = <optimized out>
id = <optimized out>
#4 0x0000000000402349 in do_test () at tst-robust8.c:234
e = <optimized out>
n = 30
p = 21169
status = 9
round = 1
ma = {__size = "\000\000\000\300", __align = -1073741824}
#5 0x0000000000401a17 in main (argc=<optimized out>, argv=<optimized out>)
at test-skeleton.c:412
direct = <optimized out>
status = 0
opt = <optimized out>
timeoutfactor = 1
termpid = <optimized out>
envstr_timeoutfactor = <optimized out>
envstr_direct = <optimized out>
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* [Bug nptl/19004] tst-robust8 fails intermittently on x86_64
2015-09-25 8:50 [Bug nptl/19004] New: tst-robust8 fails intermittently on x86_64 fweimer at redhat dot com
2015-09-25 8:54 ` [Bug nptl/19004] " fweimer at redhat dot com
@ 2015-09-25 9:45 ` fweimer at redhat dot com
2020-04-28 17:08 ` carlos at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2015-09-25 9:45 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=19004
--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
I could reproduce this on a much smaller machine (with once i7-4810MQ CPU),
with glibc-2.17-78.el7.x86_64. The hang looks identical.
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* [Bug nptl/19004] tst-robust8 fails intermittently on x86_64
2015-09-25 8:50 [Bug nptl/19004] New: tst-robust8 fails intermittently on x86_64 fweimer at redhat dot com
2015-09-25 8:54 ` [Bug nptl/19004] " fweimer at redhat dot com
2015-09-25 9:45 ` fweimer at redhat dot com
@ 2020-04-28 17:08 ` carlos at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: carlos at redhat dot com @ 2020-04-28 17:08 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=19004
Carlos O'Donell <carlos at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://bugzilla.redhat.com
| |/show_bug.cgi?id=1026383
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2015-09-25 8:50 [Bug nptl/19004] New: tst-robust8 fails intermittently on x86_64 fweimer at redhat dot com
2015-09-25 8:54 ` [Bug nptl/19004] " fweimer at redhat dot com
2015-09-25 9:45 ` fweimer at redhat dot com
2020-04-28 17:08 ` carlos at redhat dot com
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