Hi, I have been testing creating in effect rolling snapshots in a mysql-zrm kinda way (mysql lock and system call). I have in the process managed to create a kernel oops that might be of interest to ML (brought about by me doing something pretty stupid, don't panic). I originally have my /var/lib/mysql as a LVM jfs partition. Then took a number of snapshots, mounted them, etc .. Then descided to switch to ext3, etc so backed up the contents, unmounted /var/lib/mysql, reformatted as ext3 and remounted. Then tried (afterwards) to umount then lvremove the snapshots .. oops (I think it is triggered by the umount)! Life seems to be continuing as normal inspite of the oops (subsequent snapshots seem fine, etc). Let me know if anyone is interested in more info .. some obvious bits follow. -- from syslog Dec 20 17:15:02 ford kernel: metapage_read_end_io: I/O error Dec 20 17:15:03 ford kernel: metapage_write_end_io: I/O error Dec 20 17:15:05 ford kernel: kjournald starting. Commit interval 5 seconds Dec 20 17:15:05 ford kernel: EXT3 FS on dm-14, internal journal Dec 20 17:15:05 ford kernel: EXT3-fs: mounted filesystem with ordered data mode. Dec 20 17:15:05 ford kernel: kjournald starting. Commit interval 5 seconds Dec 20 17:15:05 ford kernel: EXT3 FS on dm-26, internal journal Dec 20 17:15:05 ford kernel: EXT3-fs: mounted filesystem with ordered data mode. Dec 20 17:15:11 ford kernel: metapage_write_end_io: I/O error Dec 20 17:15:11 ford kernel: metapage_read_end_io: I/O error Dec 20 17:15:11 ford kernel: metapage_read_end_io: I/O error Dec 20 17:15:11 ford kernel: metapage_write_end_io: I/O error Dec 20 17:15:11 ford kernel: metapage_read_end_io: I/O error Dec 20 17:15:11 ford kernel: metapage_read_end_io: I/O error Dec 20 17:15:11 ford kernel: metapage_write_end_io: I/O error Dec 20 17:15:11 ford kernel: metapage_read_end_io: I/O error Dec 20 17:15:11 ford last message repeated 2 times Dec 20 17:15:12 ford kernel: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000024 Dec 20 17:15:12 ford kernel: printing eip: Dec 20 17:15:12 ford kernel: f89838a8 Dec 20 17:15:12 ford kernel: *pde = 2f277001 Dec 20 17:15:12 ford kernel: *pte = 00000000 Dec 20 17:15:12 ford kernel: Oops: 0000 [#1] Dec 20 17:15:12 ford kernel: SMP Dec 20 17:15:12 ford kernel: Modules linked in: jfs dm_snapshot dm_mirror softdog tg3 genrtc ext2 ext3 jbd mbcache dm_mod sd_mod aacraid scsi_mod unix Dec 20 17:15:12 ford kernel: CPU: 1 Dec 20 17:15:12 ford kernel: EIP: 0060:[pg0+946014376/1070248960] Not tainted VLI Dec 20 17:15:12 ford kernel: EFLAGS: 00010246 (2.6.19 #1) Dec 20 17:15:12 ford kernel: EIP is at lmWriteRecord+0x28/0x366 [jfs] Dec 20 17:15:12 ford kernel: eax: 00000000 ebx: e222040c ecx: 00000000 edx: e2220434 Dec 20 17:15:12 ford kernel: esi: e22203c0 edi: e22203c0 ebp: f05290c0 esp: c82afe18 Dec 20 17:15:12 ford kernel: ds: 007b es: 007b ss: 0068 Dec 20 17:15:12 ford kernel: Process umount (pid: 5513, ti=c82ae000 task=c7dbf550 task.ti=c82ae000) Dec 20 17:15:12 ford kernel: Stack: 00000001 0000000e 00000000 00000000 00000000 00000000 7fffffff 00000000 Dec 20 17:15:12 ford kernel: c20f7700 c01840f2 00000000 00000000 00000000 e222040c e22203c0 e22203c0 Dec 20 17:15:12 ford kernel: f05290c0 f8984eb6 e22203c0 00000000 c82afe74 00000000 edab542c 00000000 Dec 20 17:15:12 ford kernel: Call Trace: Dec 20 17:15:12 ford kernel: [bio_put+42/48] bio_put+0x2a/0x30 Dec 20 17:15:12 ford kernel: [pg0+946020022/1070248960] lmLogShutdown +0x60/0x11e [jfs] Dec 20 17:15:12 ford kernel: [filemap_write_and_wait+61/68] filemap_write_and_wait+0x3d/0x44 Dec 20 17:15:12 ford kernel: [pg0+946019339/1070248960] lmLogClose +0x102/0x108 [jfs] Dec 20 17:15:12 ford kernel: [pg0+945920067/1070248960] updateSuper +0x56/0x11a [jfs] Dec 20 17:15:12 ford kernel: [pg0+945920780/1070248960] jfs_umount +0xf4/0x104 [jfs] Dec 20 17:15:12 ford kernel: [pg0+945902263/1070248960] jfs_put_super +0x19/0x83 [jfs] Dec 20 17:15:12 ford kernel: [generic_shutdown_super+264/274] generic_shutdown_super+0x108/0x112 Dec 20 17:15:12 ford kernel: [kill_block_super+45/73] kill_block_super +0x2d/0x49 Dec 20 17:15:12 ford kernel: [deactivate_super+81/151] deactivate_super +0x51/0x97 Dec 20 17:15:12 ford kernel: [sys_umount+63/145] sys_umount+0x3f/0x91 Dec 20 17:15:12 ford kernel: [sys_munmap+71/85] sys_munmap+0x47/0x55 Dec 20 17:15:12 ford kernel: [sys_oldumount+23/27] sys_oldumount +0x17/0x1b Dec 20 17:15:12 ford kernel: [syscall_call+7/11] syscall_call+0x7/0xb Dec 20 17:15:12 ford kernel: [fib_get_next+255/282] fib_get_next +0xff/0x11a Dec 20 17:15:12 ford kernel: ======================= Dec 20 17:15:12 ford kernel: Code: 00 eb b0 55 57 56 53 83 ec 34 c7 44 24 30 00 00 00 00 c7 44 24 14 00 00 00 00 8b 44 24 48 8b 40 48 8b 4c 24 54 89 44 24 2c 85 c9 <8b> 50 24 8b 44 24 48 89 54 24 28 8b 40 44 89 44 24 24 0f 84 a4 Dec 20 17:15:12 ford kernel: EIP: [pg0+946014376/1070248960] lmWriteRecord+0x28/0x366 [jfs] SS:ESP 0068:c82afe18 Dec 20 17:15:12 ford kernel: BUG: warning at kernel/exit.c:859/do_exit() Dec 20 17:15:12 ford kernel: [do_exit+1096/1101] do_exit+0x448/0x44d Dec 20 17:15:12 ford kernel: [do_trap+0/269] do_trap+0x0/0x10d Dec 20 17:15:12 ford kernel: [do_page_fault+737/1749] do_page_fault +0x2e1/0x6d5 Dec 20 17:15:12 ford kernel: [find_get_pages_tag+65/131] find_get_pages_tag+0x41/0x83 Dec 20 17:15:12 ford kernel: [do_page_fault+0/1749] do_page_fault +0x0/0x6d5 Dec 20 17:15:12 ford kernel: [error_code+57/64] error_code+0x39/0x40 Dec 20 17:15:12 ford kernel: [pg0+946014376/1070248960] lmWriteRecord +0x28/0x366 [jfs] Dec 20 17:15:12 ford kernel: [bio_put+42/48] bio_put+0x2a/0x30 Dec 20 17:15:12 ford kernel: [pg0+946020022/1070248960] lmLogShutdown +0x60/0x11e [jfs] Dec 20 17:15:12 ford kernel: [filemap_write_and_wait+61/68] filemap_write_and_wait+0x3d/0x44 Dec 20 17:15:12 ford kernel: [pg0+946019339/1070248960] lmLogClose +0x102/0x108 [jfs] Dec 20 17:15:12 ford kernel: [pg0+945920067/1070248960] updateSuper +0x56/0x11a [jfs] Dec 20 17:15:12 ford kernel: [pg0+945920780/1070248960] jfs_umount +0xf4/0x104 [jfs] Dec 20 17:15:12 ford kernel: [pg0+945902263/1070248960] jfs_put_super +0x19/0x83 [jfs] Dec 20 17:15:12 ford kernel: [generic_shutdown_super+264/274] generic_shutdown_super+0x108/0x112 Dec 20 17:15:12 ford kernel: [kill_block_super+45/73] kill_block_super +0x2d/0x49 Dec 20 17:15:12 ford kernel: [deactivate_super+81/151] deactivate_super +0x51/0x97 Dec 20 17:15:12 ford kernel: [sys_umount+63/145] sys_umount+0x3f/0x91 Dec 20 17:15:12 ford kernel: [sys_munmap+71/85] sys_munmap+0x47/0x55 Dec 20 17:15:12 ford kernel: [sys_oldumount+23/27] sys_oldumount +0x17/0x1b Dec 20 17:15:12 ford kernel: [syscall_call+7/11] syscall_call+0x7/0xb Dec 20 17:15:12 ford kernel: [fib_get_next+255/282] fib_get_next +0xff/0x11a Dec 20 17:15:12 ford kernel: ======================= I'm running a 2.6.19 kernel, lvdisplay --version tells me: LVM version: 2.02.07 (2006-07-17) Library version: 1.02.08 (2006-07-17) Driver version: 4.10.0 Cheers, Alan _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
