Date: Mon, 14 Sep 1998 00:00:17 +0200 (CEST) From: Andrzej Bialecki <abial@nask.pl> To: freebsd-current@FreeBSD.ORG Subject: Help, DEVFS/MFS is broken... Message-ID: <Pine.BSF.4.02A.9809132345080.20680-100000@korin.warman.org.pl>
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Hi, This is yet another call for help to all those who know the filesystems, to help fix this bug before 3.0-R... This is a genuine bug which panics system in 100% cases, and makes any system using DEVFS and MFS unusable. Below is an excerpt from my earlier posting, including the stack trace. I tried several times to contact Julian Elischer, but it looks like he disappeared in a black hole... PS. If it's any good, I can open a PR on this... Andrzej Bialecki -------------------- ++-------++ ------------------------------------- <abial@nask.pl> ||PicoBSD|| FreeBSD in your pocket? Go and see: Research & Academic |+-------+| "Small & Embedded FreeBSD" Network in Poland | |TT~~~| | http://www.freebsd.org/~picobsd/ -------------------- ~-+==---+-+ ------------------------------------- >From abial@nask.pl Sun Sep 13 23:53:10 1998 Date: Thu, 27 Aug 1998 11:46:13 +0200 (CEST) From: Andrzej Bialecki <abial@nask.pl> To: Julian Elischer <julian@whistle.com> Cc: freebsd-current@FreeBSD.ORG Subject: It's MFS panic.. (Re: Panic with DEVFS) On Wed, 26 Aug 1998, Andrzej Bialecki wrote: > I'm totally lame when it comes to FS internals, but this looks to me > as if some delayed action (caching? cleaning? read-ahead? whatever?) > is causing this. ...but it looks like I was right after all. Below is the trace (no crashdump available yet - I'm working on it). Source tree is about four days old. One important notice, though: this time I was able to reliably crash _without_ disabling any device, and even when not touching /dev at all - it was enough to do just an 'ls -l' of some directory a few times to produce sufficient number of dirty pages... The only thing that is common in all these cases is: * root on MFS * DEVFS/SLICE kernel and it seems these two definitely don't like each other.. :-( So, here's the stack trace (taken by hand.. :-<< ): _panic() _mfs_strategy(ap=...) at _mfs_strategy+0x3c [../../ufs/mfs/mfs_vnops.c:137] _bwrite(bp=...) at _bwrite+0xaf [../../kern/vfs_bio.c:891] * _vop_stdbwrite(ap=...) at _vop_defaultop+0x15 [../../kern/vfs_default.c:131] * _bawrite(bp=...) at _bawrite+0x2c [../../kern/vfs_bio.c:1122] * _spec_fsync(ap=...) at _spec_fsync+0x76 [../../miscfs/specfs/spec_vnops.c:509] _mfs_fsync(ap=...) at _mfs_fsync+0x16 [../../ufs/mfs/mfs_vnops.c:118] _sched_sync() at _sched_sync+0xa4 [../../kern/vfs_subr.c:499] _kproc_start(udata=...) at _kproc_start+0x32 [../../kern/init_main.c:248] _fork_trampoline(...,...,...,...,...) at _fork_trampoline+0x30 The lines marked with stars ('*') in other panics were replaced with the following lines: _vop_stdbwrite(ap=...) at _vop_stdbwrite+0xe [../../kern/vfs_default.c:285] _vop_defaultop(ap=...) at _vop_defaultop+0x15 [../../kern/vfs_default.c:131] _vfs_bio_awrite(bp=...) at _vfs_bio_awrite+0x103 [../../kern/vfs_bio.c:1122] _spec_fsync(ap=...) at _spec_fsync+0x1e [../../miscfs/specfs/spec_vnops.c:503] I also tried to do a 'show object' which printed: db> show object Object 0xf019bb75: type=1694529634, size=0x65007864, res=1166738538, ret=1694529635, flags=0x7363 Fatal trap 12: page fault while in kernel mode ... fault code = supervisor read, page not present ... current process = 4 (syncer) interrupt mask = bio and at this point I gave up... I'll try to get the coredump, if you're interested in having it... Andrzej Bialecki +---------------------+------------------------+--------------------------+ | <abial@nask.pl> | When in problem or in | if(halt_per_mth > 0) { | | Research & Academic | doubt, run in circles, | fetch("FreeBSD"); | | Network in Poland | scream and shout. | } | + --------------------+------------------------+--------------------------+ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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