Re: kern/54647: panic: ffs_newvnode: dup alloc ino=2782620

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

The following reply was made to PR kern/54647; it has been noted by GNATS.

From: Kamil Rytarowski <n54%gmx.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/54647: panic: ffs_newvnode: dup alloc ino=2782620
Date: Fri, 25 Oct 2019 11:49:43 +0200

 On 25.10.2019 11:30, Manuel Bouyer wrote:
 > The following reply was made to PR kern/54647; it has been noted by GNAT=
 S.
 >
 > From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
 > To: gnats-bugs%netbsd.org@localhost
 > Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs@netb=
 sd.org,
 >         lawrence_danna%apple.com@localhost
 > Subject: Re: kern/54647: panic: ffs_newvnode: dup alloc ino=3D2782620
 > Date: Fri, 25 Oct 2019 11:25:05 +0200
 >
 >  On Fri, Oct 25, 2019 at 09:05:01AM +0000, Kamil Rytarowski wrote:
 >  > The following reply was made to PR kern/54647; it has been noted by G=
 NATS.
 >  >
 >  > From: Kamil Rytarowski <n54%gmx.com@localhost>
 >  > To: gnats-bugs%netbsd.org@localhost
 >  > Cc:
 >  > Subject: Re: kern/54647: panic: ffs_newvnode: dup alloc ino=3D2782620
 >  > Date: Fri, 25 Oct 2019 11:01:27 +0200
 >  >
 >  >  On 25.10.2019 06:50, lawrence_danna%apple.com@localhost wrote:
 >  >  >> Number:         54647
 >  >  >> Category:       kern
 >  >  >> Synopsis:       panic: ffs_newvnode: dup alloc ino=3D3D2782620
 >  >  >> Confidential:   no
 >  >  >> Severity:       serious
 >  >  >> Priority:       high
 >  >  >> Responsible:    kern-bug-people
 >  >  >> State:          open
 >  >  >> Class:          sw-bug
 >  >  >> Submitter-Id:   net
 >  >  >> Arrival-Date:   Fri Oct 25 04:50:00 +0000 2019
 >  >  >> Originator:     Lawrence D'Anna
 >  >  >> Release:        8.1_STABLE
 >  >  >> Organization:
 >  >  > apple
 >  >  >> Environment:
 >  >  > NetBSD localhost 8.1_STABLE NetBSD 8.1_STABLE (GENERIC) #0: Thu Oc=
 t 17 1=3D
 >  >  8:41:27 UTC 2019  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64=
 /compi=3D
 >  >  le/GENERIC amd64
 >  >  >
 >  >  >> Description:
 >  >  > netbsd# panic: ffs_newvnode: dup alloc ino=3D3D2782620 on /data: m=
 ode a1ed=3D
 >  >  /a1ed gen 3835531f/3835531f size 0 blocks 8
 >  >  > cpu0: Begin traceback...
 >  >  > vpanic() at netbsd:vpanic+0x15d
 >  >  > snprintf() at netbsd:snprintf
 >  >  > ffs_newvnode() at netbsd:ffs_newvnode+0x530
 >  >  > vcache_new() at netbsd:vcache_new+0x95
 >  >  > ufs_makeinode() at netbsd:ufs_makeinode+0x38
 >  >  > ufs_symlink() at netbsd:ufs_symlink+0x3a
 >  >  > VOP_SYMLINK() at netbsd:VOP_SYMLINK+0x58
 >  >  > do_sys_symlinkat.isra.4() at netbsd:do_sys_symlinkat.isra.4+0x219
 >  >  > syscall() at netbsd:syscall+0x1ec
 >  >  > --- syscall (number 57) ---
 >  >  > 79d3d743e64a:
 >  >  > cpu0: End traceback...
 >  >  >
 >  >  >> How-To-Repeat:
 >  >  > I've got a VM I was using to build LLDB that panics like that ever=
 y time=3D
 >  >   I start the build back up again.
 >  >  >> Fix:
 >  >  >
 >  >
 >  >  This is unfortunate that malformed filesystem images panic the kerne=
 l.
 >  >
 >  >  I wrote a fuzzer for this purpose:
 >  >
 >  >  http://netbsd.org/~kamil/rump/rump_pub_etfs_register_buffer.c
 >  >
 >  >  It still needs man effort to fix the crashes.
 >
 >  This should be a mount option. I *want* a panic if the filesystem is
 >  corrupted. No linux-like degraded mode please
 >
 
 Deliberate panic on broken FS is OK for those who want it, but random
 crashes for bugs like division by 0 in the kernel is not.
 
 >  --
 >  Manuel Bouyer <bouyer%antioche.eu.org@localhost>
 >       NetBSD: 26 ans d'experience feront toujours la difference
 >  --
 >
 >