Date: Sun, 21 Feb 1999 18:32:09 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Luoqi Chen <luoqi@watermarkgroup.com> Cc: dfr@nlsystems.com, freebsd-hackers@FreeBSD.ORG Subject: Re: Panic in FFS/4.0 as of yesterday - update Message-ID: <Pine.LNX.4.04.9902211828530.4408-100000@feral-gw> In-Reply-To: <199902212353.SAA12884@lor.watermarkgroup.com>
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> > On Sun, 21 Feb 1999, Matthew Jacob wrote:
> >
> > >
> > > Sorry to say that during testing last night (in the middle of which a
> > > buildworld got started) the system paniced again with a 'panic: getnewbuf
> > > infinite recursion failure'. I've left it in the debugger if anyone could
> > > suggest looking at something. I'm going to New Orleans tomorrow so it can
> > > sit in the debugger until Friday...
> > >
> > > A very cursory look at the code makes me wonder 'why the value of 5 for a
> > > limit'? It doesn't seem to me a panic is a good solution.
> >
> > Apart from the use of 5 as a 'magic' number, this code doesn't cope with
> > being reentered by another process - the recursion test needs to be on a
> > per-process basis. I'm sure that if you check the stack trace, you won't
> > see any kind of recursion happening.
> >
> What troubled me here is why these supposedly async writes block (and ccd
> is not involved)? I'd really like to see a dump of ps listing from ddb.
Ask and ye shall receive (some 'Mores' editted out):
panic: getnewbuf: cannot get buffer, infinite recursion failure
panic
Stopped at Debugger..ng+0x24: ldq ra,0(sp) <0xfffffe0007ef99f0> <ra=0xfffffc00004c5c58,sp=0xfffffe0007ef99f0>
db> $c
?
db> t
Debugger..ng() at Debugger..ng+0x24
panic..ng() at panic..ng+0xf0
getnewbuf..ng() at getnewbuf..ng+0x424
getblk..ng() at getblk..ng+0x3e0
ffs_balloc..ng() at ffs_balloc..ng+0xa50
ffs_write..ng() at ffs_write..ng+0x384
vn_write..ng() at vn_write..ng+0x160
write..ng() at write..ng+0x12c
syscall..ng() at syscall..ng+0x1dc
XentSys() at XentSys+0x50
(null)() at 0x120000fe8
db> ps axl
Symbol not found
db> ps
pid proc addr uid ppid pgrp flag stat wmesg wchan cmd
14173 fffffe0007b44f80 fffffe0007f5e000 0 12549 4274 004004 2 make
14164 fffffe0007b45b60 fffffe0007f98000 31154 14163 13374 004004 2 ld
14163 fffffe0007b4a040 fffffe0007b86000 31154 14148 13374 004084 3 wait fffffe0007b4a040 cc
14148 fffffe0007b45dc0 fffffe0007f94000 31154 13374 13374 004084 3 wait fffffe0007b45dc0 make
13377 fffffe000707b900 fffffe0007b04000 0 13372 147 004184 3 piperd fffffe0007a4ee40 sendmail
13374 fffffe0007b496c0 fffffe0007b98000 31154 13372 13374 004084 3 wait fffffe0007b496c0 sh
13372 fffffe0007b48fa0 fffffe0007bac000 0 147 147 000084 3 piperd fffffe0007a4f620 cron
12549 fffffe0007b46020 fffffe0007f5a000 0 12545 4274 004084 3 wait fffffe0007b46020 sh
12545 fffffe000707da40 fffffe0007ac4000 0 90946 4274 004084 3 wait fffffe000707da40 make
10908 fffffe0007b47580 fffffe0007efa000 31154 770 10908 004006 3 getblk fffffe00044537f0 writeit
10907 fffffe0007b49920 fffffe0007b94000 31154 770 10907 004006 3 getblk fffffe00044640f0 writeit
10906 fffffe0007b4b0e0 fffffe0007b62000 31154 770 10906 004006 3 getblk fffffe00044a2ff0 writeit
10905 fffffe000707d0c0 fffffe0007ad4000 31154 770 10905 004006 3 getblk fffffe0004470460 writeit
10904 fffffe0007b45900 fffffe0007f9c000 31154 770 10904 004006 3 getblk fffffe0004470460 writeit
10903 fffffe000707b1e0 fffffe0007b10000 31154 770 10903 004006 3 nfsrcvlk fffffe0007a55b00 writeit
10902 fffffe0007b47320 fffffe0007efe000 31154 770 10902 004006 3 nfsrcvlk fffffe0007a55b00 writeit
10901 fffffe000707d7e0 fffffe0007ac8000 31154 770 10901 004006 3 getblk fffffe0004483d68 writeit
10900 fffffe0007b49460 fffffe0007b9c000 31154 770 10900 004006 3 getblk fffffe0004470460 writeit
10899 fffffe0007b48ae0 fffffe0007bb6000 31154 770 10899 004006 3 nfsrcvlk fffffe0007a55b00 writeit
10898 fffffe0007b48880 fffffe0007bba000 31154 770 10898 004006 3 getblk fffffe0004470460 writeit
10897 fffffe0007079ee0 fffffe0007b3e000 31154 770 10897 004006 3 nfsrcvlk fffffe0007a55b00 writeit
10896 fffffe0007b44600 fffffe0007f6a000 31154 770 10896 004006 3 nfsrcvlk fffffe0007a55b00 writeit
10895 fffffe0007b46e60 fffffe0007f0e000 31154 770 10895 004006 2 writeit
10894 fffffe0007b4ac20 fffffe0007b6a000 31154 770 10894 004006 3 getblk fffffe0004456cf0 writeit
10892 fffffe0007b48d40 fffffe0007bb2000 31154 770 10892 004006 3 getblk fffffe0004470460 writeit
10891 fffffe000707cc00 fffffe0007ae0000 31154 770 10891 004006 3 getblk fffffe0004470460 writeit
10890 fffffe0007b45440 fffffe0007fa4000 31154 770 10890 004006 3 getblk fffffe00044a2108 writeit
10889 fffffe000707b440 fffffe0007b0c000 31154 770 10889 004006 3 getblk fffffe0004470460 writeit
10888 fffffe0007b47a40 fffffe0007ef2000 31154 770 10888 004006 3 getblk fffffe0004467e38 writeit
10887 fffffe0007b48620 fffffe0007bc0000 31154 770 10887 004006 3 getblk fffffe000445f9b8 writeit
10886 fffffe0007b46c00 fffffe0007f12000 31154 770 10886 004006 2 writeit
10885 fffffe0007b477e0 fffffe0007ef6000 31154 770 10885 004006 2 writeit
10884 fffffe0007b4b340 fffffe0007b5e000 31154 770 10884 004006 2 writeit
10883 fffffe0007b44ac0 fffffe0007f66000 31154 770 10883 004006 2 writeit
10882 fffffe0007b4a2a0 fffffe0007b80000 31154 770 10882 004006 3 getblk fffffe0004470460 writeit
10880 fffffe000707ce60 fffffe0007adc000 31154 770 10880 004006 3 nfsrcvlk fffffe0007a55b00 writeit
10879 fffffe0007b451e0 fffffe0007fa8000 31154 770 10879 004006 3 getblk fffffe0004470460 writeit
10878 fffffe000707a140 fffffe0007b3a000 31154 770 10878 004006 3 getblk fffffe0004470460 writeit
10877 fffffe000707e160 fffffe0007ab4000 31154 770 10877 004006 2 writeit
10875 fffffe0007b46280 fffffe0007f24000 31154 770 10875 004006 2 writeit
10874 fffffe0007b49200 fffffe0007ba8000 31154 770 10874 004006 3 getblk fffffe0004470460 writeit
10872 fffffe0007b47ca0 fffffe0007eee000 31154 770 10872 004006 2 writeit
10870 fffffe0007b464e0 fffffe0007f28000 31154 770 10870 004006 2 writeit
10868 fffffe0007b483c0 fffffe0007ee2000 31154 770 10868 004006 2 writeit
10867 fffffe000707bdc0 fffffe0007afa000 31154 770 10867 004006 2 writeit
10866 fffffe0007b49b80 fffffe0007b90000 31154 770 10866 004006 3 getblk fffffe0004444e68 writeit
10865 fffffe0007b4b5a0 fffffe0007b5a000 31154 770 10865 004006 2 writeit
10864 fffffe000707a3a0 fffffe0007b36000 31154 770 10864 004006 3 getblk fffffe0004470460 writeit
10863 fffffe0007b4a500 fffffe0007b78000 31154 770 10863 004006 2 writeit
10862 fffffe0007b470c0 fffffe0007f0a000 31154 770 10862 004006 3 getblk fffffe0004470460 writeit
10861 fffffe0007b46740 fffffe0007f1a000 31154 770 10861 004006 2 writeit
10859 fffffe0007b4ba60 fffffe0007b52000 31154 770 10859 004006 3 getblk fffffe0004470460 writeit
90946 fffffe000707a600 fffffe0007b32000 0 90943 4274 004084 3 wait fffffe000707a600 sh
90943 fffffe000707dca0 fffffe0007abe000 0 90942 4274 004084 3 wait fffffe000707dca0 make
90942 fffffe000707aac0 fffffe0007b1e000 0 4285 4274 004084 3 wait fffffe000707aac0 sh
4285 fffffe0007b4bcc0 fffffe0007b4c000 0 4284 4274 004084 3 wait fffffe0007b4bcc0 make
4284 fffffe000707c4e0 fffffe0007aee000 0 4283 4274 004084 3 wait fffffe000707c4e0 sh
4283 fffffe000707d580 fffffe0007acc000 0 4282 4274 004084 3 wait fffffe000707d580 make
4282 fffffe000707c280 fffffe0007af2000 0 4279 4274 004084 3 wait fffffe000707c280 sh
4279 fffffe000707bb60 fffffe0007afe000 0 4278 4274 004084 3 wait fffffe000707bb60 make
4278 fffffe000707d320 fffffe0007ad0000 0 4275 4274 004084 3 wait fffffe000707d320 sh
4275 fffffe000707a860 fffffe0007b2c000 31154 4274 4274 004084 3 wait fffffe000707a860 sh
4274 fffffe000707efa0 fffffe0007a9a000 31154 4272 4274 004084 3 wait fffffe000707efa0 sh
4272 fffffe000707ad20 fffffe0007b18000 0 147 147 000084 3 piperd fffffe0007a4fa80 cron
770 fffffe000707f460 fffffe0007a8e000 31154 193 770 004086 3 pause fffffe0007a8e1a8 csh
261 fffffe000707e3c0 fffffe0007aae000 31154 230 261 004186 3 nanslp fffffc000056b890 iostat
230 fffffe000707eae0 fffffe0007aa2000 31154 229 230 004086 3 wait fffffe000707eae0 bash
229 fffffe000707ed40 fffffe0007a9e000 0 144 229 004184 3 select fffffc000058fa20 rlogind
193 fffffe000707f200 fffffe0007a96000 31154 192 193 004086 3 wait fffffe000707f200 bash
192 fffffe00070802a0 fffffe0007a72000 0 144 192 004184 3 select fffffc000058fa20 rlogind
188 fffffe0007081340 fffffe0007a38000 0 1 188 004086 3 ttyin fffffc0000589810 getty
147 fffffe000707f6c0 fffffe0007a88000 0 1 147 000084 3 nanslp fffffc000056b890 cron
144 fffffe000707f920 fffffe0007a82000 0 1 144 000084 3 select fffffc000058fa20 inetd
126 fffffe000707fb80 fffffe0007a7e000 0 1 118 000084 3 nfsidl fffffc0000592a98 nfsiod
125 fffffe000707fde0 fffffe0007a7a000 0 1 118 000084 3 nfsidl fffffc0000592a90 nfsiod
124 fffffe0007080040 fffffe0007a76000 0 1 118 000084 3 nfsidl fffffc0000592a88 nfsiod
123 fffffe00070810e0 fffffe0007a3c000 0 1 118 000084 3 nfsidl fffffc0000592a80 nfsiod
107 fffffe0007080500 fffffe0007a6e000 0 1 107 000084 3 select fffffc000058fa20 ypbind
103 fffffe0007080760 fffffe0007a6a000 1 1 103 000184 3 select fffffc000058fa20 portmap
99 fffffe00070809c0 fffffe0007a5a000 0 1 99 000084 3 select fffffc000058fa20 xntpd
91 fffffe0007080e80 fffffe0007a40000 0 1 91 000084 3 select fffffc000058fa20 syslogd
20 fffffe0007080c20 fffffe0007a44000 0 1 20 000284 3 mfsidl fffffe0007073500 mount_mfs
4 fffffe00070815a0 fffffe0007094000 0 0 0 000204 3 syncer fffffc000058f970 syncer
3 fffffe0007081800 fffffe0007090000 0 0 0 000204 3 psleep fffffc0000588034 vmdaemon
2 fffffe0007081a60 fffffe000708c000 0 0 0 000204 3 psleep fffffc00005527f8 pagedaemon
1 fffffe0007081cc0 fffffe0007088000 0 0 1 004084 3 wait fffffe0007081cc0 init
0 fffffc000058e1b0 fffffc000061c000 0 0 0 000204 3 sched fffffc000058e1b0 swapper
db>
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