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Date: Sat, 19 Mar 2022 11:07:25 -0700
From: syzbot <syzbot+46f5c25af73eb8330eb6@...kaller.appspotmail.com>
To: jfs-discussion@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
shaggy@...nel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] divide error in dbNextAG
Hello,
syzbot found the following issue on:
HEAD commit: 09688c0166e7 Linux 5.17-rc8
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=163e5015700000
kernel config: https://syzkaller.appspot.com/x/.config?x=70f75a89c7a0e6bc
dashboard link: https://syzkaller.appspot.com/bug?extid=46f5c25af73eb8330eb6
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=132c1d61700000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+46f5c25af73eb8330eb6@...kaller.appspotmail.com
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3622 Comm: syz-executor.0 Not tainted 5.17.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:dbNextAG+0xfc/0x5f0 fs/jfs/jfs_dmap.c:602
Code: 48 89 c1 48 89 44 24 08 83 e0 07 48 c1 e9 03 0f b6 0c 11 48 89 c2 83 c2 03 38 ca 7c 08 84 c9 0f 85 ca 03 00 00 44 89 f8 31 d2 <41> f7 75 14 49 89 c7 49 8d 45 20 48 89 c2 48 89 44 24 20 48 b8 00
RSP: 0018:ffffc900028d7a40 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801d782800 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88801f5c3008
RBP: ffff88801d782800 R08: 0000000000000000 R09: ffffc900028d797f
R10: fffff5200051af2f R11: 0000000000000000 R12: ffff88806dede530
R13: ffff88801f5c3000 R14: ffff88806dedf598 R15: 0000000000000000
FS: 00007f05def99700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f05def99718 CR3: 000000001ef61000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
diAlloc+0xa96/0x1730 fs/jfs/jfs_imap.c:1342
ialloc+0x89/0xaa0 fs/jfs/jfs_inode.c:56
jfs_mkdir+0x1f0/0xab0 fs/jfs/namei.c:225
vfs_mkdir+0x1c3/0x3b0 fs/namei.c:3933
do_mkdirat+0x285/0x300 fs/namei.c:3959
__do_sys_mkdirat fs/namei.c:3974 [inline]
__se_sys_mkdirat fs/namei.c:3972 [inline]
__x64_sys_mkdirat+0x115/0x170 fs/namei.c:3972
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: 0033:0x7f05df845049
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f05def99168 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f05df958030 RCX: 00007f05df845049
RDX: 0000000000000020 RSI: 0000000020000300 RDI: 0000000000000005
RBP: 00007f05df89f08d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc16fbfa9f R14: 00007f05def99300 R15: 0000000000022000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dbNextAG+0xfc/0x5f0 fs/jfs/jfs_dmap.c:602
Code: 48 89 c1 48 89 44 24 08 83 e0 07 48 c1 e9 03 0f b6 0c 11 48 89 c2 83 c2 03 38 ca 7c 08 84 c9 0f 85 ca 03 00 00 44 89 f8 31 d2 <41> f7 75 14 49 89 c7 49 8d 45 20 48 89 c2 48 89 44 24 20 48 b8 00
RSP: 0018:ffffc900028d7a40 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801d782800 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88801f5c3008
RBP: ffff88801d782800 R08: 0000000000000000 R09: ffffc900028d797f
R10: fffff5200051af2f R11: 0000000000000000 R12: ffff88806dede530
R13: ffff88801f5c3000 R14: ffff88806dedf598 R15: 0000000000000000
FS: 00007f05def99700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcf01138f8 CR3: 000000001ef61000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 48 89 c1 mov %rax,%rcx
3: 48 89 44 24 08 mov %rax,0x8(%rsp)
8: 83 e0 07 and $0x7,%eax
b: 48 c1 e9 03 shr $0x3,%rcx
f: 0f b6 0c 11 movzbl (%rcx,%rdx,1),%ecx
13: 48 89 c2 mov %rax,%rdx
16: 83 c2 03 add $0x3,%edx
19: 38 ca cmp %cl,%dl
1b: 7c 08 jl 0x25
1d: 84 c9 test %cl,%cl
1f: 0f 85 ca 03 00 00 jne 0x3ef
25: 44 89 f8 mov %r15d,%eax
28: 31 d2 xor %edx,%edx
* 2a: 41 f7 75 14 divl 0x14(%r13) <-- trapping instruction
2e: 49 89 c7 mov %rax,%r15
31: 49 8d 45 20 lea 0x20(%r13),%rax
35: 48 89 c2 mov %rax,%rdx
38: 48 89 44 24 20 mov %rax,0x20(%rsp)
3d: 48 rex.W
3e: b8 .byte 0xb8
---
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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