Should be fixed on master (763ff625ac).
Issue #2615 has been updated by nthery.
Hello,
It tries to ptrace(PT_ATTACH) to process 0 (the swapper) and crashes
during the reparenting because process 0 has no parent. There is
definitely a bug in the kernel which should return an error. This is
maybe also symptomatic of a bug in gdb which shouldn't try to debug
process 0 (or is it a negative test checking how gdb reacts when
failing to attach to a process?)
I'm tempted to make ptrace(PT_ATTACH) return EINVAL for all system
processes to prevent this as a reckon ptrace(2) is intended to debug
userlang only and attaching to kernel processes, besides security
issues, is deadlock-prone. I'm checking the literature and other
implementations to confirm this is the way to go.
Cheers,
Nicolas
On 17 December 2013 23:25, <bugtracker-admin@leaf.dragonflybsd.org> wrote:
Issue #2615 has been reported by phma.
----------------------------------------
Bug #2615: panic while running gdb test suite
http://bugs.dragonflybsd.org/issues/2615
I ran the testsuite on gdb 7.6.1 and it crashed partway through. This is as far as it got:
Running ./gdb.base/fileio.exp ...
FAIL: gdb.base/fileio.exp: Open for write but no write permission returns
EACCES
FAIL: gdb.base/fileio.exp: Unlinking a file in a directory w/o write access
returns EACCES
Running ./gdb.base/gcore-relro.exp ...
Running ./gdb.base/huge.exp ...
Running ./gdb.base/find.exp ...
Running ./gdb.base/ctxobj.exp ...
Running ./gdb.base/cond-eval-mode.exp ...
Running ./gdb.base/arrayidx.exp ...
Running ./gdb.base/eval-skip.exp ...
Running ./gdb.base/attach.exp ...
It crashed in the same place both times. The kernel dumps are numbers 2 and 3 in leaf:/home/phma/crash/zyxomma/. I need this fixed so that I can fix the thread bug in gdb.
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----------------------------------------
Bug #2615: panic while running gdb test suite
http://bugs.dragonflybsd.org/issues/2615#change-11680
I ran the testsuite on gdb 7.6.1 and it crashed partway through. This is as far as it got:
Running ./gdb.base/fileio.exp ...
FAIL: gdb.base/fileio.exp: Open for write but no write permission returns
EACCES
FAIL: gdb.base/fileio.exp: Unlinking a file in a directory w/o write access
returns EACCES
Running ./gdb.base/gcore-relro.exp ...
Running ./gdb.base/huge.exp ...
Running ./gdb.base/find.exp ...
Running ./gdb.base/ctxobj.exp ...
Running ./gdb.base/cond-eval-mode.exp ...
Running ./gdb.base/arrayidx.exp ...
Running ./gdb.base/eval-skip.exp ...
Running ./gdb.base/attach.exp ...
It crashed in the same place both times. The kernel dumps are numbers 2 and 3 in leaf:/home/phma/crash/zyxomma/. I need this fixed so that I can fix the thread bug in gdb.
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