On 16:16 Птн 15 Июн , Mingming Cao wrote: > I hit almost the same issue today also, but with different error #, and > one more kernel oops, when run fsstress on x86_64. > > EXT4-fs: writeback error = -2 > EXT4-fs: writeback error = -2 This error never happens in writeback in my case, only ENOSPC. Btw: i've send one more micro fix (see in this thread " PATCH] ext4:fix invariant checking in ext4_rebalance_reservation") > > Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: > [<ffffffff8028bbb6>] block_read_full_page+0xb5/0x267 > PGD 1f9842067 PUD 1f9843067 PMD 0 > Oops: 0000 [5] SMP > CPU 3 > Modules linked in: > Pid: 10900, comm: fsstress Not tainted 2.6.22-rc4-autokern1 #1 > RIP: 0010:[<ffffffff8028bbb6>] [<ffffffff8028bbb6>] > block_read_full_page+0xb5/0x267 > RSP: 0000:ffff8101f984fa48 EFLAGS: 00010213 > RAX: 0000000000000179 RBX: 0000000000000000 RCX: 000000000000000c > RDX: 000000000000000c RSI: ffffffff802e0f7b RDI: ffff81017ff578c8 > RBP: ffff81017ff578c8 R08: ffff8101f984fbe8 R09: ffff8101f984fbe0 > R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000000e5 > R13: 0000000000000000 R14: 0000000000001000 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8101803ec5c0(0063) knlGS:00000000f7dec460 > CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b > CR2: 0000000000000000 CR3: 00000001f9841000 CR4: 00000000000006e0 > Process fsstress (pid: 10900, threadinfo ffff8101f984e000, task > ffff8101f9824280) > Stack: 00001000f9ad4080 0000000100000000 0000000000000000 0000000000000179 > ffff8100de7c4100 ffffffff802e0f7b 000003363e3761bf ffffffff804eac2d > ffff8101f984fb48 0000000000000082 ffff81017e9bc550 ffff81017e9bc588 > Call Trace: > [<ffffffff802e0f7b>] ext4_get_block+0x0/0x104 > [<ffffffff804eac2d>] thread_return+0x0/0xd5 > [<ffffffff8028fcd6>] do_mpage_readpage+0x411/0x430 > [<ffffffff804eb481>] io_schedule+0x26/0x32 > [<ffffffff804eb6fb>] __wait_on_bit_lock+0x5f/0x6d > [<ffffffff8028fe7e>] mpage_readpage+0x42/0x5b > [<ffffffff802e0f7b>] ext4_get_block+0x0/0x104 > [<ffffffff802395eb>] wake_bit_function+0x0/0x23 > [<ffffffff8024a9bd>] file_read_actor+0x89/0xf4 > [<ffffffff8024a21e>] find_get_page+0x1e/0x4d > [<ffffffff8024a763>] do_generic_mapping_read+0x20e/0x3df > [<ffffffff8024a934>] file_read_actor+0x0/0xf4 > [<ffffffff8024c2e7>] generic_file_aio_read+0x11d/0x154 > [<ffffffff8026c7ca>] do_sync_read+0xc8/0x10b > [<ffffffff80272c4f>] permission+0xbb/0xbd > [<ffffffff802395bd>] autoremove_wake_function+0x0/0x2e > [<ffffffff8026be62>] nameidata_to_filp+0x25/0x34 > [<ffffffff8026be9e>] do_filp_open+0x2d/0x3d > [<ffffffff8026f355>] vfs_getattr+0x2b/0x2f > [<ffffffff8026f43d>] vfs_fstat+0x33/0x3a > [<ffffffff8026c8b8>] vfs_read+0xab/0x12e > [<ffffffff8026cbbc>] sys_read+0x45/0x6e > [<ffffffff80219f02>] ia32_sysret+0x0/0xa > [skip] > ------------[ cut here ]------------ > kernel BUG at fs/ext4/writeback.c:266! Yepp. I've saw this oops too, But IMHO it may be artefact caused by previous one. > invalid opcode: 0000 [6] SMP > CPU 3 > Modules linked in: > Pid: 10851, comm: fsstress Not tainted 2.6.22-rc4-autokern1 #1 > RIP: 0010:[<ffffffff802ed5f6>] [<ffffffff802ed5f6>] > ext4_wb_submit_extent+0x1ef/0x3d9 > RSP: 0000:ffff8101e47cfab8 EFLAGS: 00010246 > RAX: 000000000001182c RBX: ffff8100c6709ca0 RCX: 000000000000000c > RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8101e8de5000 > RBP: ffff8100c6709a48 R08: ffff8101b1056338 R09: 0000000000000000 > R10: ffff8101b1056338 R11: ffff8100c6709a48 R12: 0000000000000040 > R13: ffff81017eaa5b98 R14: 0000000000000040 R15: 0000000000000001 > FS: 0000000000000000(0000) GS:ffff8101803ec5c0(0063) knlGS:00000000f7dec460 > CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b > CR2: 00000000f7dcb004 CR3: 00000001e47c1000 CR4: 00000000000006e0 > Process fsstress (pid: 10851, threadinfo ffff8101e47ce000, task > ffff8101e47a6b30) > Stack: ffff8101cf22c9b8 0000000000000000 0000000000000001 0000000c00000001 > ffff8100c6709a48 000000018028938e ffff8101e47cfb68 0000000000000000 > ffff8101e47cfd28 ffff8100c6709ca0 ffff8100c6709a48 ffff8100c6709990 > Call Trace: > [<ffffffff802edb95>] ext4_wb_handle_extent+0x3b5/0x48c > [<ffffffff802ebc24>] ext4_ext_walk_space+0x18a/0x20c > [<ffffffff802ed7e0>] ext4_wb_handle_extent+0x0/0x48c > [<ffffffff802edcc7>] ext4_wb_flush+0x5b/0x153 > [<ffffffff802ee1a0>] ext4_wb_writepages+0x34b/0x398 > [<ffffffff8024f81b>] do_writepages+0x20/0x2d > [<ffffffff80286164>] __writeback_single_inode+0x1df/0x3a7 > [<ffffffff8024a47e>] find_get_pages_tag+0x34/0x89 > [<ffffffff80250c66>] pagevec_lookup_tag+0x1a/0x24 > [<ffffffff80249e89>] wait_on_page_writeback_range+0xc7/0x10d > [<ffffffff80286702>] sync_sb_inodes+0x1cb/0x2a0 > [<ffffffff8028687c>] sync_inodes_sb+0xa5/0xb9 > [<ffffffff803b3e09>] __up_read+0x10/0x8a > [<ffffffff802868fa>] __sync_inodes+0x6a/0xb1 > [<ffffffff80286952>] sync_inodes+0x11/0x29 > [<ffffffff8028895c>] do_sync+0x2c/0x50 > [<ffffffff8028898b>] sys_sync+0xb/0xf > [<ffffffff80219f02>] ia32_sysret+0x0/0xa > > > Code: 0f 0b eb fe f0 41 0f ba 75 00 14 48 8b 4c 24 40 01 51 10 48 > RIP [<ffffffff802ed5f6>] ext4_wb_submit_extent+0x1ef/0x3d9 > RSP <ffff8101e47cfab8> > > I will try the patch below...Alex, any hint about the second oops? > > Mingming > Alex please > On Fri, 2007-06-15 at 09:14 +0400, Alex Tomas wrote: > > looks like an error in error handling path (notice -28 (ENOSPC) before) > > > > thanks for the report, Alex > > > > Dmitriy Monakhov wrote: > > > ) > > > > > > Simple test failed on ext4 when delayed allocation was used. > > > #mkfs.ext3 -b4096 /dev/vzvg/test2 > > > #mount -text4dev /dev/vzvg/test2 /mnt/test -odelalloc > > > #fsstress -d /mnt/test/ -l100 -n100000 -p20 -f dwrite=0 > > > > > > <CONSOLE LOG> > > > EXT4-fs: writeback error = -28 > > > ...... > > > EXT4-fs: writeback error = -28 > > > Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: > > > [<ffffffff802a12d2>] block_read_full_page+0xab/0x25f > > > PGD 44c1067 PUD 44fd067 PMD 0 > > > Oops: 0000 [2] SMP > > > CPU 0 > > > Modules linked in: ext4dev jbd2 > > > Pid: 4833, comm: fsstress Not tainted 2.6.22-rc4-mm2 #9 > > > RIP: 0010:[<ffffffff802a12d2>] [<ffffffff802a12d2>] > > > block_read_full_page+0xab/0x25f > > > RSP: 0018:ffff810004df9a58 EFLAGS: 00010203 > > > RAX: 0000000000001000 RBX: ffff8100cf4256f8 RCX: 000000000000000c > > > > > > RDX: 0000000000000001 RSI: 000000000000000c RDI: ffff8100cf4256f8 > > > RBP: 0000000000000000 R08: ffff810004df9be8 R09: ffff810004df9c58 > > > R10: 8888888888888888 R11: 8888888888888888 R12: 0000000000000052 > > > R13: 0000000000001000 R14: 0000000000000000 R15: 00000000000000d3 > > > FS: 00002adfe3f7d6f0(0000) GS:ffffffff80730000(0000) > > > knlGS:0000000000000000 > > > CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b > > > CR2: 0000000000000000 CR3: 0000000004362000 CR4: 00000000000006e0 > > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > > > Process fsstress (pid: 4833, threadinfo ffff810004df8000, task > > > ffff810004c867a0) > > > Stack: ffffffff880180f2 ffff8100054a23f0 0000000000000000 > > > 0000000000000000 > > > ffff810005dcbb80 ffff81000549bf00 0000000000000000 ffff810005def8b0 > > > ffffffff88029e60 ffffffff8025b2be ffff8100054da540 ffff8100cf496fb0 > > > Call Trace: > > > [<ffffffff880180f2>] :ext4dev:ext4_get_block+0x0/0x109 > > > [<ffffffff8025b2be>] find_get_page+0x21/0x51 > > > [<ffffffff802a5b45>] do_mpage_readpage+0x45f/0x480 > > > [<ffffffff880180f2>] :ext4dev:ext4_get_block+0x0/0x109 > > > [<ffffffff88003d64>] :jbd2:jbd2_journal_dirty_metadata+0x197/0x1be > > > [<ffffffff80245f3b>] bit_waitqueue+0x1c/0x99 > > > [<ffffffff802a5bb4>] mpage_readpage+0x4e/0x67 > > > [<ffffffff880180f2>] :ext4dev:ext4_get_block+0x0/0x109 > > > [<ffffffff8028817e>] do_lookup+0x63/0x1ae > > > [<ffffffff8025b1ae>] file_read_actor+0x8d/0xf6 > > > [<ffffffff8025b2be>] find_get_page+0x21/0x51 > > > [<ffffffff8025b93a>] do_generic_mapping_read+0x23c/0x3da > > > [<ffffffff8025b121>] file_read_actor+0x0/0xf6 > > > [<ffffffff8025d123>] generic_file_aio_read+0x119/0x156 > > > [<ffffffff80281848>] do_sync_read+0xc9/0x10c > > > > > > [<ffffffff802845b2>] cp_new_stat+0xe5/0xfd > > > [<ffffffff80246007>] autoremove_wake_function+0x0/0x2e > > > [<ffffffff80281fba>] vfs_read+0xaa/0x132 > > > [<ffffffff80282356>] sys_read+0x45/0x6e > > > [<ffffffff8020b41e>] system_call+0x7e/0x83 > > > Code: 8b 45 00 a8 01 0f 85 e6 00 00 00 8b 45 00 a8 20 0f 85 c9 00 > > > <CONSOLE LOG> > > > > > > I've digged this a litle bit with folowig results: > > > > > > int block_read_full_page(struct page *page, get_block_t *get_block) > > > { > > > ... > > > 1914: if (!page_has_buffers(page)) <<< page_has_buffers(page) == true > > > create_empty_buffers(page, blocksize, 0); > > > head = page_buffers(page); <<<< page_buffers(page) == NULL > > > <<<i've add debug info here: > > > <<< page->flags == 100000000000821 > > > <<< PagePrivate(page) == 1, (page)->private == NULL > > > <<< So we have private page without buffers, it is WRONG. > > > > > > iblock = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); > > > lblock = (i_size_read(inode)+blocksize-1) >> inode->i_blkbits; > > > bh = head; > > > nr = 0; > > > i = 0; > > > > > > do { > > > if (buffer_uptodate(bh)) << Null pointer deref here result in > > > oops > > > ....... > > > } > > > > > > - > > > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > > > the body of a message to [EMAIL PROTECTED] > > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > > the body of a message to [EMAIL PROTECTED] > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > - > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html
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