https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293141
Bug ID: 293141
Summary: Quitting gdb while debugging a program using kqueue
leaves system unresponsive
Product: Base System
Version: 14.3-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Attachment #268006 text/plain
mime type:
Created attachment 268006
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=268006&action=edit
demonstration code
Hello,
A single-threaded process that creates two independent kqueue() objects, each
with an EVFILT_TIMER event, will cause a hard kernel lockup when run in a
debugger (gdb or lldb), interrupted, then exiting the debugger. I am seeing
this on amd64 and arm64, FreeBSD 14.3 and 15.0. I do not need root access.
To reproduce (using the attached test.c):
gcc -O0 -g -o test test.c
gdb ./test
> r
Ctrl + C to interrupt
> q
Debugger will ask if you are sure you want to quit (y/N) - answer y
At this point the system locks up hard (to the point where, when running under
vmware or qemu, the vm cannot be shutdown gracefully and the vm container must
be killed). I can still ping the box but attempts to ssh in fail. Running
shutdown on the console also fails.
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