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Historically for size limitation reasons, we would only dump the
backtrace of stuck threads. The problem is that when triggering
a panic or other reasons, we have no backtrace, which effectively
limits it to the watchdog timer. It's also visible in "show threads"
which used to report backtraces for all threads in 2.4 and displays
none nowadays, making its use much more limited.
A first approach could be to just dump the thread that triggers the
panic (in addition to stuck threads). But that remains quite limited
since "show threads" would still display nothing. This patch takes a
better approach consisting in dumping all non-idle threads. This way
the output is less polluted that with the older approach (no need to
dump all those waiting in the poller), and all active threads are
visible, in panics as well as in "show threads". As such, the CLI
command "debug dev panic" now dmups backtraces again. This is already
a benefit which will ease testing of various locations against the
ability to resolve useful symbols.
(cherry picked from commit 4adb2d864d7e3ca9df1e39beabf7b2ffa5aee35c)
Signed-off-by: Willy Tarreau <w@1wt.eu>
c984817bb8