the sync ; sync ; sync seems to have helped, as I was able to create a
union of 400+ branches w/o an issue, and performance seems reasonable.
Shaya Potter wrote:
what I'm basically doing is
setup union
while [ 1 ]
chroot union apt-get install package_$i
remount add new top branch
remount mode->ro old top branch
I'm rerunning it w/ a "sync; sync; sync" b/w the chroot and the first
remount and haven't hit the BUG() yet.
Shaya Potter wrote:
Just compiled unionfs into 2.6.22.6 and have a repeatable BUG() in a
stress test of mine that unionfs seems to tickle.
My unionfs is slightly modified to allow up to 512 branches (simple
header define change). In this case, I was up to 85 branches when
this occured.
here's the backtrace
------------[ cut here ]------------
Kernel BUG at c0179fea [verbose debug info unavailable]
invalid opcode: 0000 [#1]
SMP
Modules linked in: nfsd exportfs lockd sunrpc af_packet dm_snapshot
dm_mirror dm_mod sg sr_mod sd_mod scsi_mod ide_generic ide_cd cdrom
i2c_piix4 psmouse i2c_core rtc ext3 jbd mbcache ide_disk serverworks
tg3 ide_core unix
CPU: 0
EIP: 0060:[<c0179fea>] Not tainted VLI
EFLAGS: 00010202 (2.6.22.6 #2)
EIP is at __block_write_full_page+0x179/0x358
eax: 8000183d ebx: eb45a208 ecx: 00000014 edx: c1d7c940
esi: dfcebf60 edi: 00000000 ebp: ebbe748c esp: dfcebd38
ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068
Process pdflush (pid: 81, ti=dfcea000 task=dfc84a50 task.ti=dfcea000)
Stack: dfcebd5c c011542e 00000000 00000000 00000000 00001000 eb45a208
00000bff
00000000 c014942e f88dd168 c1d7c940 00c00000 00000000 dfcebf60
00000000
c017b7b7 dfcebf60 ebbe748c dfcebf60 f88dd168 c1d7c940 c1d7c940
eb45a208
Call Trace:
[<c011542e>] __wake_up+0x38/0x4e
[<c014942e>] set_page_address+0xa2/0x15c
[<f88dd168>] ext3_get_block+0x0/0xd7 [ext3]
[<c017b7b7>] block_write_full_page+0xe3/0xee
[<f88dd168>] ext3_get_block+0x0/0xd7 [ext3]
[<f88ddb79>] ext3_ordered_writepage+0xb5/0x16c [ext3]
[<f88ddaa4>] bget_one+0x0/0x7 [ext3]
[<f88ddac4>] ext3_ordered_writepage+0x0/0x16c [ext3]
[<c01a2765>] unionfs_writepage+0xd9/0x227
[<c01445e7>] __writepage+0x8/0x21
[<c01444e5>] write_cache_pages+0x1c5/0x2bf
[<c01445df>] __writepage+0x0/0x21
[<c014462b>] generic_writepages+0x2b/0x2d
[<c014466a>] do_writepages+0x3d/0x43
[<c017572e>] __sync_single_inode+0x55/0x1bd
[<c01758dd>] __writeback_single_inode+0x47/0x1a5
[<c0114888>] load_balance_newidle+0x62/0x152
[<c0175bc5>] sync_sb_inodes+0x18a/0x268
[<c0175d42>] writeback_inodes+0x9f/0xa8
[<c01440e3>] background_writeout+0x67/0xa1
[<c0144bd3>] __pdflush+0xcb/0x17d
[<c0144c85>] pdflush+0x0/0x2c
[<c0144c85>] pdflush+0x0/0x2c
[<c0144cad>] pdflush+0x28/0x2c
[<c014407c>] background_writeout+0x0/0xa1
[<c012b2a6>] kthread+0x6b/0x6f
[<c012b23b>] kthread+0x0/0x6f
[<c010339b>] kernel_thread_helper+0x7/0x10
=======================
Code: 5b 5e 5f 5d c3 8b 44 24 2c e8 d0 4d fc ff 8b 4c 24 44 83 41 10
01 eb e1 89 da b8 01 00 00 00 e8 8d 18 00 00 83 44 24 10 01 eb ad <0f>
0b eb fe 8b 74 24 44 8b 7e 04 85 ff 75 06 f6 46 24 01 75 37
EIP: [<c0179fea>] __block_write_full_page+0x179/0x358 SS:ESP
0068:dfcebd38
_______________________________________________
unionfs mailing list: http://unionfs.filesystems.org/
unionfs@mail.fsl.cs.sunysb.edu
http://www.fsl.cs.sunysb.edu/mailman/listinfo/unionfs
_______________________________________________
unionfs mailing list: http://unionfs.filesystems.org/
unionfs@mail.fsl.cs.sunysb.edu
http://www.fsl.cs.sunysb.edu/mailman/listinfo/unionfs
_______________________________________________
unionfs mailing list: http://unionfs.filesystems.org/
unionfs@mail.fsl.cs.sunysb.edu
http://www.fsl.cs.sunysb.edu/mailman/listinfo/unionfs
