Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2056762
Title:
ThreadSanitizer: unexpected memory mapping with 6.5.0-25.25~22.04.1
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Mantic:
Confirmed
Bug description:
We updated a number of (amd64) machines from linux-
image-6.5.0-21-generic (6.5.0-21.21~22.04.1) to linux-
image-6.5.0-25-generic (6.5.0-25.25~22.04.1), and this caused
ThreadSanitizer-instrumented programs to immediately exit with an
error similar to:
FATAL: ThreadSanitizer: unexpected memory mapping
0x5c4dc2bcd000-0x5c4dc2bed000
Reverting the kernel back to 6.5.0-21.21~22.04.1 and rebooting makes
the same executables work again.
There are a few older bugs including
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67308 and
https://github.com/google/sanitizers/issues/503 but these are from
~2015, and about gcc 7 and linux 4.1 so it does not seem to be the
same problem.
A very small program, lifted from
https://github.com/google/sanitizers/wiki/ThreadSanitizerCppManual can
be used to show the problem:
$ cat simple-race.c
#include <pthread.h>
#include <stdio.h>
int Global;
void *Thread1(void *x) {
Global++;
return NULL;
}
void *Thread2(void *x) {
Global--;
return NULL;
}
int main() {
pthread_t t[2];
pthread_create(&t[0], NULL, Thread1, NULL);
pthread_create(&t[1], NULL, Thread2, NULL);
pthread_join(t[0], NULL);
pthread_join(t[1], NULL);
}
$ cc -fsanitize=thread -fPIE -pie -g simple-race.c -o simple-race
$ ./simple-race
FATAL: ThreadSanitizer: unexpected memory mapping
0x5d161227c000-0x5d161227d000
$ uname -a
Linux buildhost 6.5.0-25-generic #25~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue
Feb 20 16:09:15 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
When running that exact same binary, on the same machine, but with
linux 6.5.0-21:
$ ./simple-race
==================
WARNING: ThreadSanitizer: data race (pid=19373)
Read of size 4 at 0x560964a2d014 by thread T2:
#0 Thread2 /home/lxc-unpriv/simple-race.c:12 (simple-race+0x12d1)
Previous write of size 4 at 0x560964a2d014 by thread T1:
#0 Thread1 /home/lxc-unpriv/simple-race.c:7 (simple-race+0x128c)
Location is global 'Global' of size 4 at 0x560964a2d014 (simple-
race+0x000000004014)
Thread T2 (tid=19376, running) created by main thread at:
#0 pthread_create
../../../../src/libsanitizer/tsan/tsan_interceptors_posix.cpp:969
(libtsan.so.0+0x605b8)
#1 main /home/lxc-unpriv/simple-race.c:19 (simple-race+0x1368)
Thread T1 (tid=19375, finished) created by main thread at:
#0 pthread_create
../../../../src/libsanitizer/tsan/tsan_interceptors_posix.cpp:969
(libtsan.so.0+0x605b8)
#1 main /home/lxc-unpriv/simple-race.c:18 (simple-race+0x1347)
SUMMARY: ThreadSanitizer: data race /home/lxc-unpriv/simple-race.c:12 in
Thread2
==================
ThreadSanitizer: reported 1 warnings
$ uname -a
Linux buildhost 6.5.0-21-generic #21~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri
Feb 9 13:32:52 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
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