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Message-ID: <0000000000008f6d2005c9e53c59@google.com>
Date: Thu, 19 Aug 2021 01:21:24 -0700
From: syzbot <syzbot+e2efa3efc15a1c9e95c3@...kaller.appspotmail.com>
To: adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
tytso@....edu
Subject: [syzbot] kernel BUG in ext4_get_group_info
Hello,
syzbot found the following issue on:
HEAD commit: 614cb2751d31 Merge tag 'trace-v5.14-rc6' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=128cfb31300000
kernel config: https://syzkaller.appspot.com/x/.config?x=f61012d0b1cd846f
dashboard link: https://syzkaller.appspot.com/bug?extid=e2efa3efc15a1c9e95c3
compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=122a0161300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e2efa3efc15a1c9e95c3@...kaller.appspotmail.com
EXT4-fs error (device loop1): ext4_map_blocks:718: inode #17: block 424: comm syz-executor.1: lblock 296 mapped to illegal pblock 424 (length 1)
------------[ cut here ]------------
kernel BUG at fs/ext4/ext4.h:3295!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 10426 Comm: syz-executor.1 Not tainted 5.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ext4_get_group_info+0x34d/0x350 fs/ext4/ext4.h:3295
Code: 5c ff 8b 74 24 04 48 c7 c7 40 77 88 8c 4c 89 f2 e8 08 9f 05 02 43 80 3c 2c 00 0f 85 6d fd ff ff e9 70 fd ff ff e8 a3 46 5c ff <0f> 0b 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 41 89 d5 89 f5
RSP: 0018:ffffc9000c49f320 EFLAGS: 00010293
RAX: ffffffff8223f12d RBX: 00000000fffff95a RCX: ffff88802d923880
RDX: 0000000000000000 RSI: 00000000fffff95a RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff8223ee48 R09: ffffed1008f9ac2c
R10: ffffed1008f9ac2c R11: 0000000000000000 R12: 1ffff110073d74cf
R13: dffffc0000000000 R14: ffff8880328dc000 R15: ffff888039eba678
FS: 00007fe3035a4700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002112848 CR3: 0000000033f2d000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
ext4_mb_load_buddy_gfp+0xc7/0x1370 fs/ext4/mballoc.c:1490
ext4_discard_preallocations+0x811/0x16a0 fs/ext4/mballoc.c:4940
ext4_truncate+0xa1a/0xec0 fs/ext4/inode.c:4259
ext4_truncate_failed_write fs/ext4/truncate.h:20 [inline]
ext4_write_begin+0xa7b/0x1350 fs/ext4/inode.c:1234
ext4_da_write_begin+0x384/0x10c0 fs/ext4/inode.c:2960
generic_perform_write+0x262/0x580 mm/filemap.c:3656
ext4_buffered_write_iter+0x41c/0x590 fs/ext4/file.c:269
ext4_file_write_iter+0x8f7/0x1b90 fs/ext4/file.c:519
call_write_iter include/linux/fs.h:2114 [inline]
new_sync_write fs/read_write.c:518 [inline]
vfs_write+0xa39/0xc90 fs/read_write.c:605
ksys_write+0x171/0x2a0 fs/read_write.c:658
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe3035a4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 000000000d4ba0ff RSI: 00000000200009c0 RDI: 0000000000000007
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd1a1dd7ef R14: 00007fe3035a4300 R15: 0000000000022000
Modules linked in:
---[ end trace 6608a809acf19a79 ]---
RIP: 0010:ext4_get_group_info+0x34d/0x350 fs/ext4/ext4.h:3295
Code: 5c ff 8b 74 24 04 48 c7 c7 40 77 88 8c 4c 89 f2 e8 08 9f 05 02 43 80 3c 2c 00 0f 85 6d fd ff ff e9 70 fd ff ff e8 a3 46 5c ff <0f> 0b 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 41 89 d5 89 f5
RSP: 0018:ffffc9000c49f320 EFLAGS: 00010293
RAX: ffffffff8223f12d RBX: 00000000fffff95a RCX: ffff88802d923880
RDX: 0000000000000000 RSI: 00000000fffff95a RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff8223ee48 R09: ffffed1008f9ac2c
R10: ffffed1008f9ac2c R11: 0000000000000000 R12: 1ffff110073d74cf
R13: dffffc0000000000 R14: ffff8880328dc000 R15: ffff888039eba678
FS: 00007fe3035a4700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000033f2d000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 5c pop %rsp
1: ff 8b 74 24 04 48 decl 0x48042474(%rbx)
7: c7 c7 40 77 88 8c mov $0x8c887740,%edi
d: 4c 89 f2 mov %r14,%rdx
10: e8 08 9f 05 02 callq 0x2059f1d
15: 43 80 3c 2c 00 cmpb $0x0,(%r12,%r13,1)
1a: 0f 85 6d fd ff ff jne 0xfffffd8d
20: e9 70 fd ff ff jmpq 0xfffffd95
25: e8 a3 46 5c ff callq 0xff5c46cd
2a: 0f 0b ud2 <-- trapping instruction
2c: 90 nop
2d: 55 push %rbp
2e: 41 57 push %r15
30: 41 56 push %r14
32: 41 55 push %r13
34: 41 54 push %r12
36: 53 push %rbx
37: 48 83 ec 20 sub $0x20,%rsp
3b: 41 89 d5 mov %edx,%r13d
3e: 89 f5 mov %esi,%ebp
---
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@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
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