Re: kern/53120 (gdb issues with threaded programs)

[Kamil Rytarowski <n54%gmx.com@localhost>]

The following reply was made to PR kern/53120; it has been noted by GNATS.

From: Kamil Rytarowski <n54%gmx.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/53120 (gdb issues with threaded programs)
Date: Thu, 21 Jun 2018 19:26:25 +0200

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 From: Kamil Rytarowski <n54%gmx.com@localhost>
 To: gnats-bugs%NetBSD.org@localhost
 Message-ID: <a1fa055f-0139-7b86-243c-719b03fd7f7b%gmx.com@localhost>
 Subject: Re: kern/53120 (gdb issues with threaded programs)
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 On 21.06.2018 15:35, Andreas Gustafsson wrote:
 > The following reply was made to PR kern/53120; it has been noted by GNA=
 TS.
 >=20
 > From: Andreas Gustafsson <gson%gson.org@localhost>
 > To: gnats-bugs%NetBSD.org@localhost, martin%NetBSD.org@localhost, christos%NetBSD.org@localhost, kami=
 l%NetBSD.org@localhost
 > Cc:=20
 > Subject: Re: kern/53120 (gdb issues with threaded programs)
 > Date: Thu, 21 Jun 2018 16:18:37 +0300
 >=20
 >  I'm also having gdb issues with threaded programs in -current, similar=
 
 >  to those Martin reported in March, and they are impeding my attempts
 >  to track down other bugs.
 > =20
 >  Here is a shell script I'm currently using to test for the problem:
 > =20
 >  sysctl -w security.pax.mprotect.enabled=3D0 || true
 >  sysctl -w security.pax.mprotect.ptrace=3D0 || true
 >  cat <<EOF >test.gdb
 >  b main
 >  run +time=3D1 +tries=3D1 @127.0.0.177
 >  b write
 >  cont
 >  cont
 >  cont
 >  cont
 >  cont
 >  EOF
 >  gdb --batch -x test.gdb dig >gdb.out
 >  cat gdb.out
 >  ! grep SIGSEGV gdb.out
 > =20
 >  This will exit with a nonzero status if gdb is triggering spurious
 >  SIGSEGVs, as it does in -current.
 > =20
 >  I believe the problem was introduced by Christos' import of gdb 8.0.1
 >  in November 2017.  I have not run a full bisection, but I manually ran=
 
 >  the above test against some source dates around that time, and they sh=
 ow
 >  the test passing before the import and failing after it:
 > =20
 >  2017.05.01.12.29.40   pass
 >  2017.11.28.15.31.33   pass
 >  2017.11.30.14.51.01   fail
 >  2017.11.30.15.26.57   fail
 >  2017.12.02.22.51.22   fail
 >  2018.06.19.09.25.13   fail
 > =20
 >  Would anyone object to reassigning this PR from Kamil to Christos?
 >  --=20
 >  Andreas Gustafsson, gson%gson.org@localhost
 > =20
 >=20
 
 I've estimated that I will need around 6 months for remaining
 showstoppers in ptrace(2) in MI code (signals, forks/vforks, threads)...
 however I'm preempted by sanitizer work partially due to GSoC tasks
 (fuzzing etc), reports from !x86 ports (syscall(2)/__syscall(2) issues)
 and LLVM-7svn branching scheduled for August 1st.
 
 If something worked with threads before GDB 8.0, it was by an accident.
 Please be patient and I will get it functional for -9.
 
 
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