Messages in this thread Patch in this message | | | Date | Mon, 14 Feb 2022 02:03:37 +0800 | Subject | Re: [syzbot] kernel BUG in ext4_es_cache_extent | From | Phi Nguyen <> |
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On 2/6/2022 9:49 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 9f7fb8de5d9b Merge tag 'spi-fix-v5.17-rc2' of git://git.ke.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=148d0304700000 > kernel config: https://syzkaller.appspot.com/x/.config?x=b4a89edfcc8f7c74 > dashboard link: https://syzkaller.appspot.com/bug?extid=c7358a3cd05ee786eb31 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=124e0abfb00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1758f610700000 > > Bisection is inconclusive: the issue happens on the oldest tested release. > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12758738700000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=11758738700000 > console output: https://syzkaller.appspot.com/x/log.txt?x=16758738700000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+c7358a3cd05ee786eb31@syzkaller.appspotmail.com > > loop0: detected capacity change from 0 to 1051 > EXT4-fs (loop0): ext4_check_descriptors: Checksum for group 0 failed (60935!=0) > EXT4-fs (loop0): mounted filesystem without journal. Quota mode: writeback. > ------------[ cut here ]------------ > kernel BUG at fs/ext4/extents_status.c:899! > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 3587 Comm: syz-executor288 Not tainted 5.17.0-rc2-syzkaller-00039-g9f7fb8de5d9b #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:ext4_es_cache_extent+0x4e8/0x550 fs/ext4/extents_status.c:899 > Code: 00 48 c7 c7 e0 6c c1 89 c6 05 71 25 6f 0b 01 e8 b0 b6 f6 06 e9 5a ff ff ff e8 94 9d 68 ff 0f 0b e9 d7 fc ff ff e8 88 9d 68 ff <0f> 0b e8 81 9d 68 ff 0f 0b e9 13 fe ff ff e8 25 df af ff e9 c2 fb > RSP: 0018:ffffc90001abee80 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 00000000000013de RCX: 0000000000000000 > RDX: ffff88807deb0000 RSI: ffffffff820fd0f8 RDI: 0000000000000003 > RBP: ffff888074e6f048 R08: 00000000ffffffff R09: 0000000000000000 > R10: ffffffff820fce3c R11: 0000000000000000 R12: 0000000000000001 > R13: 00000000ffffffff R14: 1ffff92000357dd1 R15: 00008f1cffffffff > FS: 0000555556ad6300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f117149e4b0 CR3: 000000007cc1f000 CR4: 0000000000350ee0 > Call Trace: > <TASK> > ext4_cache_extents+0x13e/0x2d0 fs/ext4/extents.c:518 > ext4_find_extent+0x8f6/0xd10 fs/ext4/extents.c:916 > ext4_ext_map_blocks+0x1e2/0x5f30 fs/ext4/extents.c:4098 > ext4_map_blocks+0x9ca/0x18a0 fs/ext4/inode.c:563 > ext4_getblk+0x553/0x6b0 fs/ext4/inode.c:849 > ext4_bread_batch+0x7c/0x550 fs/ext4/inode.c:923 > __ext4_find_entry+0x482/0x1050 fs/ext4/namei.c:1600 > ext4_lookup_entry fs/ext4/namei.c:1701 [inline] > ext4_lookup fs/ext4/namei.c:1769 [inline] > ext4_lookup+0x4fc/0x730 fs/ext4/namei.c:1760 > __lookup_slow+0x24c/0x480 fs/namei.c:1707 > lookup_slow fs/namei.c:1724 [inline] > walk_component+0x40f/0x6a0 fs/namei.c:2020 > link_path_walk.part.0+0x7ef/0xf70 fs/namei.c:2347 > link_path_walk fs/namei.c:2272 [inline] > path_openat+0x266/0x2940 fs/namei.c:3605 > do_filp_open+0x1aa/0x400 fs/namei.c:3636 > do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 > do_sys_open fs/open.c:1230 [inline] > __do_sys_openat fs/open.c:1246 [inline] > __se_sys_openat fs/open.c:1241 [inline] > __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x7f8e44f22f19 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fff98aa3238 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8e44f22f19 > RDX: 000000000000c880 RSI: 0000000020000100 RDI: 0000000000000005 > RBP: 00007f8e44ee27b0 R08: 0000000800000015 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8e44ee2840 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:ext4_es_cache_extent+0x4e8/0x550 fs/ext4/extents_status.c:899 > Code: 00 48 c7 c7 e0 6c c1 89 c6 05 71 25 6f 0b 01 e8 b0 b6 f6 06 e9 5a ff ff ff e8 94 9d 68 ff 0f 0b e9 d7 fc ff ff e8 88 9d 68 ff <0f> 0b e8 81 9d 68 ff 0f 0b e9 13 fe ff ff e8 25 df af ff e9 c2 fb > RSP: 0018:ffffc90001abee80 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 00000000000013de RCX: 0000000000000000 > RDX: ffff88807deb0000 RSI: ffffffff820fd0f8 RDI: 0000000000000003 > RBP: ffff888074e6f048 R08: 00000000ffffffff R09: 0000000000000000 > R10: ffffffff820fce3c R11: 0000000000000000 R12: 0000000000000001 > R13: 00000000ffffffff R14: 1ffff92000357dd1 R15: 00008f1cffffffff > FS: 0000555556ad6300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f117149e4b0 CR3: 000000007cc1f000 CR4: 0000000000350ee0 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches >
The non-journal mounted fs is corrupted, syzbot was able to mount it because a [fast commit] patch exclude its inodes from verification process.
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 01c9e4f743ba..385f4ae71573 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4912,7 +4912,7 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino, goto bad_inode; } else if (!ext4_has_inline_data(inode)) { /* validate the block references in the inode */ - if (!(EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY) && + if (!(journal && EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY) && (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || (S_ISLNK(inode->i_mode) && !ext4_inode_is_fast_symlink(inode)))) { | |