kernel BUG at jfs_dmap.c:776

sorry, this occurs for 2.4.21 *AND* 2.5.72 :-(
here again the error from the 2.5.72 kernel, below is the known part.

XT_GETPAGE: xtree page corrupt
xtLookup: xtSearch returned 5
XT_GETPAGE: xtree page corrupt
xtLookup: xtSearch returned 5
XT_GETPAGE: xtree page corrupt
xtLookup: xtSearch returned 5
XT_GETPAGE: xtree page corrupt
xtLookup: xtSearch returned 5
jfs_read_super: get root inode failed
XT_GETPAGE: xtree page corrupt
xtLookup: xtSearch returned 5
BUG at fs/jfs/jfs_dmap.c:760 assert(hint < mapSize) Kernel bug at fs/jfs/jfs_dmap.c:760 mount(669): Kernel Bug 1
pc = [<fffffffc003b0980>] ra = [<fffffffc003b0974>] ps = 0000 Not tainted

v0 = 0000000000000037  t0 = 0000000000000001  t1 = fffffc0000539250
t2 = 0000000000000000  t3 = 0000000000000000  t4 = ffffffff00000000
t5 = 0000000000000001  t6 = fffffc000052e210  t7 = fffffc00033f4000
a0 = 0000000000000000  a1 = 0000000000000000  a2 = 0000000000000000
a3 = 0000000000000000  a4 = 0000000000000001  a5 = 0000000000000002
t8 = 0000000000000004  t9 = fffffc0000562e70  t10= 0000000000000000
t11= 000000000000000a  pv = fffffc0000324a50  at = 0000000000000000
gp = fffffffc003cdc30  sp = fffffc00033f78f8
Trace:fffffc0000318a24 fffffc000036d51c fffffc00003fe2d8 fffffc00003fd178 fffffc00004038e4 fffffc00004022f0 fffffc0000329294 fffffc0000348734 fffffc0000348508 fffffc0000344e5c fffffc00003716e4 fffffc0000371ab0 fffffc000038b9bc fffffc000038bdcc fffffc000038c3ec fffffc000038c3c8 fffffc0000313084 fffffc0000312fe0
Code: 22730d1b  225f02f8  6b5b4000  27ba0002  23bdd2bc  00000081 <000002f8> 003ce916

Note: i don't know about the XT_Ü* messages right before the "Bug at..".
seconds before i mounted a created a reiserfs on this partition, mounted it, unmounted it. the i created the JFS, the bug msg appeared at the mount attempt. but the XT_* msg are like to be some product of JFS, because of the timestamp in my logs (but you'll know better anyway).

Thanks,
Christian.

-------------------------------------

Hi,

while doing some benchmarks, i noticed a segfault when trying to mount a newly created JFS. mkfs.jfs passes, but mount gives:

BUG at jfs_dmap.c:776 assert(hint < mapSize)
kernel BUG at jfs_dmap.c:776!
mount(1055): Kernel Bug 1
pc = [<fffffffc003236b4>] ra = [<fffffffc003236a8>] ps = 0000 Not
tainted

v0 = 000000000000001e  t0 = 0000000000000001  t1 = 0000000000000000
t2 = fffffc00011d2948  t3 = 0000000000000000  t4 = ffffffff00000000
t5 = 0000000000000001  t6 = 343c0a29657a6953  t7 = fffffc0002cf8000
a0 = 0000000000000000  a1 = 0000000000000001  a2 = 0000000000000001
a3 = 0000000000000001  a4 = 0000000000000001  a5 = 0000000000000002
t8 = 0000000000000004  t9 = 0000000000001c0e  t10= 0000000000001c0f
t11= fffffc00011f0988  pv = fffffc000101fb90  at = fffffc00011f0988
gp = fffffffc00347c88  sp = fffffc0002cfb9e8

Trace:fffffc0001029f50 fffffc0001053b88 fffffc0001054838 fffffc000103e1ac fffffc00010168b0 fffffc000105808c fffffc00010585a4 fffffc0001058434 fffffc0001070b28 fffffc0001070f3c fffffc0001070d18 fffffc000107155c fffffc0001071538 fffffc0001010d30 fffffc0001010c88

Code: 22106a0c  47e90411  6b5b4106  27ba0002  23bd45e0  00000081

<c3fffecb> 47ff041f

this is with vanilla 2.4.21 (Alpha), compiled with gcc3.3, glibc 2.3.1, util-linux 2.11z.

thanks,
Christian.

JFS is broken when the page size is greater than 4K, as is the case for Alpha. This needs to be fixed, but I've put it off since I haven't had ready access to the right hardware, and I haven't had any success trying to boot a i386 kernel with a larger page size. I'll try to find the time to work on this within the next couple weeks.

Thanks,
Shaggy

David Kleikamp
IBM Linux Technology Center

ok, fine :-)

thank you,
Christian.