-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 4/27/12 7:45 PM, Sami Liedes wrote: > [This is a distinct bug from the another similar-looking mail that I > just sent on this list - confusingly by mistake with the subject this > mail should have had...] > > The 10 MiB ext4 image available at > > http://www.niksula.hut.fi/~sliedes/ext4/2000177.min.ext4.bz2 > > causes a crash on mainline 3.3.4 kernel at umount time when the > following operations are run (not all of these are probably really > necessary): > > 1. mount 2000177.min.ext4 /mnt -t ext4 -o errors=continue > 2. cd /mnt > 3. cp -r doc doc2 >&/dev/null > 4. find -xdev >&/dev/null > 5. find -xdev -print0 2>/dev/null |xargs -0 touch -- 2>/dev/null > 6. mkdir tmp >&/dev/null > 7. echo whoah >tmp/filu 2>/dev/null > 8. rm -rf /mnt/* >&/dev/null > 9. cd / > 10. umount /mnt > > See the dmesg output below (the panic is due to panic_on_oops=1). > > The image differs from a pristine, fully working ext4 filesystem > available at > > http://www.niksula.hut.fi/~sliedes/ext4/pristine.ext4.bz2 > > by only one bit: > > ------------------------------------------------------------ > $ wget http://www.niksula.hut.fi/~sliedes/ext4/pristine.ext4.bz2 > $ bunzip2 pristine.ext4.bz2 > $ diff -u <(hd pristine.ext4) <(hd 2000177.min.ext4) > --- /dev/fd/63 2012-04-28 03:39:00.167101668 +0300 > +++ /dev/fd/62 2012-04-28 03:39:00.167101668 +0300 > @@ -32168,7 +32168,7 @@ > 00170050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > * > 00170400 07 01 00 00 0c 00 01 02 2e 00 00 00 a4 00 00 00 |................| > -00170410 0c 00 02 02 2e 2e 00 00 08 01 00 00 e8 03 28 01 |..............(.| > +00170410 0c 00 02 02 2e 2e 00 00 08 00 00 00 e8 03 28 01 |..............(.| > 00170420 5c 78 32 66 64 65 76 69 63 65 73 5c 78 32 66 76 |\x2fdevices\x2fv| > 00170430 69 72 74 75 61 6c 5c 78 32 66 62 6c 6f 63 6b 5c |irtual\x2fblock\| > 00170440 78 32 66 64 6d 2d 31 31 00 00 00 00 00 00 00 00 |x2fdm-11........| > ------------------------------------------------------------ That's block 1473 (this is a 1k block fs) debugfs: stat <263> Inode: 263 Type: directory Mode: 0755 Flags: 0x80000 Generation: 1162591830 Version: 0x00000002 User: 0 Group: 0 Size: 1024 File ACL: 0 Directory ACL: 0 Links: 2 Blockcount: 2 Fragment: Address: 0 Number: 0 Size: 0 ctime: 0x48bf269d -- Wed Sep 3 19:06:53 2008 atime: 0x484aa7c8 -- Sat Jun 7 10:22:48 2008 mtime: 0x4845aca6 -- Tue Jun 3 15:42:14 2008 EXTENTS: (0):1473 which is a directory. The changed byte is the inode nr in the dir entry; it should be 264 (0x108) but got changed to 8 (0x8) ... which is the journal inode. That can't be good. Testing a patch I'll send shortly if it works. - -Eric > > (This bug report serves also as a preview of the Berserker toolkit > that automates finding such bugs and minimizing the differences to > pristine filesystems. I plan on making the announcement and making the > toolkit available within the next few hours.) sounds a bit like fsfuzzer, how is it different? > Sami > > > ------------------------------------------------------------ > EXT4-fs (vdb): mounted filesystem with ordered data mode. Opts: errors=continue > ------------[ cut here ]------------ > kernel BUG at fs/jbd2/transaction.c:161! BUG_ON(journal->j_flags & JBD2_UNMOUNT); > invalid opcode: 0000 [#1] > CPU 0 > Pid: 1528, comm: umount Not tainted 3.3.4 #1 Bochs Bochs > RIP: 0010:[<ffffffff811c19b1>] [<ffffffff811c19b1>] start_this_handle+0x591/0x6d0 > RSP: 0018:ffff880006c57b38 EFLAGS: 00010202 > RAX: 0000000000000039 RBX: ffff880006d06828 RCX: 0000000000021020 > RDX: 0000000000000039 RSI: ffffffff817b4ba0 RDI: ffff880006d06828 > RBP: ffff880006c57be8 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000153 R12: 0000000000000062 > R13: ffff880006d06800 R14: ffff880006cee040 R15: ffff880006c57ba8 > FS: 0000000000000000(0000) GS:ffffffff8161d000(0063) knlGS:00000000f74e9750 > CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b > CR2: 00000000f75833e0 CR3: 000000000614c000 CR4: 00000000000006b0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process umount (pid: 1528, threadinfo ffff880006c56000, task ffff880006cee040) > Stack: > 0000000000000000 ffff880006cee040 ffffffff810e748d 00000000fffedcd4 > ffff880007252608 ffff880006cee040 ffff880006c0f200 ffff880006cee040 > ffff880000000050 0000000000000296 ffff880006c57b98 ffffffff8107660d > Call Trace: > [<ffffffff810e748d>] ? kmem_cache_alloc+0xad/0x150 > [<ffffffff8107660d>] ? trace_hardirqs_on+0xd/0x10 > [<ffffffff811c1c11>] jbd2__journal_start+0x121/0x1a0 > [<ffffffff81186785>] ? ext4_evict_inode+0x135/0x490 > [<ffffffff811c1c9e>] jbd2_journal_start+0xe/0x10 > [<ffffffff811a07da>] ext4_journal_start_sb+0x7a/0x1d0 > [<ffffffff8114437b>] ? __dquot_initialize+0x2b/0x180 > [<ffffffff81186785>] ext4_evict_inode+0x135/0x490 > [<ffffffff81105057>] evict+0xa7/0x1b0 > [<ffffffff81105de5>] iput+0x105/0x210 > [<ffffffff811cb847>] jbd2_journal_destroy+0x1b7/0x240 > [<ffffffff81053200>] ? abort_exclusive_wait+0xb0/0xb0 > [<ffffffff811a0cd3>] ext4_put_super+0x73/0x320 > [<ffffffff810ee52d>] generic_shutdown_super+0x5d/0xf0 > [<ffffffff810efa3b>] kill_block_super+0x2b/0x80 > [<ffffffff810ee365>] deactivate_locked_super+0x45/0x80 > [<ffffffff810ee3e8>] deactivate_super+0x48/0x60 > [<ffffffff81108bd0>] mntput_no_expire+0xa0/0xf0 > [<ffffffff81109e0c>] sys_umount+0x6c/0x360 > [<ffffffff8110a10b>] sys_oldumount+0xb/0x10 > [<ffffffff813f5331>] sysenter_dispatch+0x7/0x2a > [<ffffffff8122ee0e>] ? trace_hardirqs_on_thunk+0x3a/0x3f > Code: 47 fa e8 93 16 23 00 48 8b 85 60 ff ff ff 4d 39 be a8 00 00 00 73 07 4d 89 be a8 00 00 00 48 89 c7 e8 a4 17 23 00 e9 30 ff ff ff <0f> 0b 48 c7 c1 50 21 42 81 ba df 00 00 00 31 c0 48 c7 c6 38 8c > RIP [<ffffffff811c19b1>] start_this_handle+0x591/0x6d0 > RSP <ffff880006c57b38> > ---[ end trace a277562ac91d83ad ]--- > Kernel panic - not syncing: Fatal exception > Rebooting in 1 seconds.. > ------------------------------------------------------------ -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJPm0sVAAoJECCuFpLhPd7gQnEQAJ2nivGha/vInCViGr0Q3Q8w HVtjEcpH1fK16IrhyOKqon+P7O/Jwn3+4rnSv8jGDwEmnly9KWQ7bTpo3KPGrdTk /IpqMW06NLJIrlVyRO3ro2q7iqQD9VapZYg1jLdf/XKRT+VIlr38Ve/gS2kPQWN0 vR22A0+od22lvMiERCVzWRJ0IO32pkwFM7Ff3GuEcau9r+aOFYZz7kLQDzlssWa7 SfeIsKTtuplSSIcBudvXHK8asLtW9goLmTz4JfuZWTakGze4Y/Q0nd7yYgeO38wr 3L0X+pwTQpGmEdu7sFl5ZmSsu38RNxJqxepoNGiKZnEW2XNrO8ro+ckg732YmVpg 6N/c5OP2dnsPPISuORM1ssoHtJyEs/IvBE6RV9r9IZ/EA1yFFSLZbdxzFmO3A21K bDuNG3H7loPZ52JULAWTEmvTkFiiC7nkk5ZuowKk8a4p3kGa5kAsLT7UEsV/gyix wmq1C1LeiVdYR78wLEj9eMd9cz0WasrPMzbwzyatoXIkRvw1vtVsfWkaXoVrcsAu Ae2Xhi9ito+yZ4rymXvy9+i2KZOf7XVrdRbivDC9tumpImBVDpnOO3zS/NbKosiw AdxrVkQYTZnMoW8jOowakmEXMPZgmFmHBNSk0YG/EawSh0GDKKe1n5Tn57dl0XV9 /e/CT822l7foYCC6zG+B =+8Qg -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
