BUG in JFFS2 kernel 2.6.27
Joakim Tjernlund
Joakim.Tjernlund at transmode.se
Fri Feb 27 03:00:55 EST 2009
> Joakim Tjernlund/Transmode wrote on 13/01/2009 16:16:42:
> >
> > Anders Grafström <grfstrm at users.sourceforge.net> wrote on 13/01/2009
15:36:43:
> >
> > >
> > > joakim.tjernlund at transmode.se wrote:
> > > > Just got this BUG:
> > > >
> > > > Data CRC 22c90447 != calculated CRC cbf47f8b for node at 07d2aadc
> > > > ------------[ cut here ]------------
> > > > kernel BUG at fs/jffs2/file.c:251!
> > > > Oops: Exception in kernel mode, sig: 5
[#1]
> > > > TMCUTU
> > > > NIP: c00eb5d0 LR: c004ab34 CTR:
c00eb57c
> > > > REGS: ce217bf0 TRAP: 0700 Not tainted
(2.6.27)
> > > > MSR: 00029032 <EE,ME,IR,DR> CR: 24022422 XER:
00000000
> > > > TASK = ce1d6800[424] 'ne_swumd' THREAD:
ce216000
> > > > GPR00: 00000001 ce217ca0 ce1d6800 ce296520 cf51b708 00000000
002a6000
> > > > 00001000
> > > > GPR08: 00001000 00000000 c016bac4 cf86f600 00400000 10069018
10060000
> > > > 00000000
> > > > GPR16: 002a6000 00000000 00000000 c021010c 00000000 ce296520
cf86f400
> > > > cf51b648
> > > > GPR24: 00000000 00001000 00000000 002a6000 00000000 cf51b670
ce216000
> > > > c0441820
> > > > NIP [c00eb5d0] jffs2_write_end+0x54/0x228
> > > > LR [c004ab34] generic_file_buffered_write+0x178/0x634
> > > > Call Trace:
> > > > [ce217ca0] [c016aa94] release_sock+0x94/0xa8
(unreliable)
> > > > [ce217ce0] [c004ab34]
generic_file_buffered_write+0x178/0x634
> > > > [ce217d70] [c004b394]
__generic_file_aio_write_nolock+0x3a4/0x568
> > > > [ce217df0] [c004b6b0] generic_file_aio_write+0x68/0x120
> > > > [ce217e20] [c006a1a4] do_sync_write+0xc8/0x13c
> > > > [ce217ef0] [c006a2b4] vfs_write+0x9c/0x174
> > > > [ce217f10] [c006a468] sys_write+0x4c/0x90
> > > > [ce217f40] [c000f3ec] ret_from_syscall+0x0/0x38
> > > > --- Exception: c01 at 0xf9c1744
> > > > LR = 0x1003ce20
> > > > Instruction dump:
> > > > 83a40000 7f384214 54dc053a 817d008c 82cb019c 92e10008 3afdffd8
80090000
> > > > 70090008 41820004 7c000026 54001ffe <0f000000> 6b291000 7d2bfe70
7d604a78
> > > > ---[ end trace 79c27f7a1b03cf81 ]---
> > > >
> > > > Anyone seen something similar?
> > >
> > > I think it's this one again:
> > >
http://lists.infradead.org/pipermail/linux-mtd/2008-April/021473.html
> > >
> > > The patch in the above post avoids this BUG_ON by aborting early
> > > when the dnode
> > > read fails and propagates an error code back to userspace and thus
> > > avoids this path to be taken.
> >
> > This seems like the right thing to do. Why test the return value from
jffs2_do_readpage_nolock()
> > if it always returns 0? If this is enough though is unclear to me.
> >
> > David?
> >
> > >
> > > I didn't pursue it since I was unsure whether it would remove some
> > > self-healing properties of the design in non-debug builds.
> > >
It would be really nice if this error could be fixed before .29
Patch exists here:
http://lists.infradead.org/pipermail/linux-mtd/2008-April/021473.html
Jocke
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