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Re: GDB and thread


Am 28.12.2019 um 23:03 schrieb Ken Brown:
On 12/28/2019 4:27 PM, Marco Atzeri wrote:
Hi,
I am trying to debug the libuv test failures,
but it seems I am not able to convince GDB on stopping
just before the failure.

Is "thread apply all" working on Cygwin ?
The fact that produces no output in comparison to
a normal break command is a bit strange

(gdb) break test-dlerror.c:34
Breakpoint 1 at 0x10040b0b0: file /pub/devel/libuv/libuv-1.34.0/test/test-dlerro
r.c, line 34.
(gdb) thread apply all break test-dlerror.c:34

Others know this better than I do, but I seem to recall that a break command
automatically applies to all threads.  In other words, "thread apply all" is
redundant.

It seems to ignore any break for what I see.
thread apply all was a tentative after simple break was ineffective


(gdb) run dlerror
Starting program: /cygdrive/d/cyg_pub/devel/libuv/libuv-1.34.0-build/test/.libs/
run-tests.exe dlerror
[New Thread 139176.0x231a0]
[New Thread 139176.0x231c8]
[New Thread 139176.0x21a0c]
[New Thread 139176.0x2332c]
[New Thread 139176.0x230b0]
[New Thread 139176.0x231cc]
[New Thread 139176.0x23028]
[New Thread 139176.0x23214]
[Thread 139176.0x23028 exited with code 0]
not ok 1 - dlerror
# exit code 134
# Output from process `dlerror`:
# Assertion failed in /pub/devel/libuv/libuv-1.34.0/test/test-dlerror.c on line
45: strstr(msg, path) != NULL
[Thread 139176.0x231c8 exited with code 134]
[Thread 139176.0x230b0 exited with code 134]
[Thread 139176.0x2332c exited with code 134]
[Thread 139176.0x23214 exited with code 134]
[Thread 139176.0x21a0c exited with code 134]
[Inferior 1 (process 139176) exited with code 0206]
(gdb)


Any hint will be appreciated

Might this be related to optimization?  That could change the order in which
lines of code are executed.  Have you tried building without optimization?

Already thought, but it is built with -ggdb -O0

Ken

Marco

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