divide error in dbNextAG

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 59456c9cc40c Linux 4.19.204
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15011a75300000
kernel config: https://syzkaller.appspot.com/x/.config?x=a84b4514346e13dc
dashboard link: https://syzkaller.appspot.com/bug?extid=bbcb6dfec634ea33e4db
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bbcb6d...@syzkaller.appspotmail.com

divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 19130 Comm: syz-executor.0 Not tainted 4.19.204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:dbNextAG+0xff/0x530 fs/jfs/jfs_dmap.c:615
Code: df 48 89 c1 48 89 04 24 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 8a 03 00 00 44 89 f0 31 d2 <41> f7 74 24 14 49 89 c6 49 8d 44 24 20 48 89 c2 48 89 44 24 18 48
RSP: 0018:ffff88822f49fac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880ab338900 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880a19dcc08
RBP: ffff888018bc1910 R08: 0000000000000000 R09: ffffed101433ba0a
R10: ffff8880a19dd057 R11: 0000000000074071 R12: ffff8880a19dcc00
R13: ffff88802f86f9a8 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f9f56ece700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014a53ad CR3: 00000002307ec000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
diAlloc+0x7ea/0x1440 fs/jfs/jfs_imap.c:1380
ialloc+0x8c/0x970 fs/jfs/jfs_inode.c:69
jfs_mkdir.part.0+0x131/0x870 fs/jfs/namei.c:237
jfs_mkdir+0x3f/0x60 fs/jfs/namei.c:222
vfs_mkdir+0x508/0x7a0 fs/namei.c:3819
do_mkdirat+0x262/0x2d0 fs/namei.c:3842
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4656f7
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 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:00007f9f56ecdfa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004656f7
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020002940
RBP: 00007f9f56ece040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000020002940 R14: 00007f9f56ece000 R15: 0000000000000000
Modules linked in:
---[ end trace af3457dcb4799cd9 ]---
RIP: 0010:dbNextAG+0xff/0x530 fs/jfs/jfs_dmap.c:615
Code: df 48 89 c1 48 89 04 24 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 8a 03 00 00 44 89 f0 31 d2 <41> f7 74 24 14 49 89 c6 49 8d 44 24 20 48 89 c2 48 89 44 24 18 48
RSP: 0018:ffff88822f49fac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8880ab338900 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880a19dcc08
RBP: ffff888018bc1910 R08: 0000000000000000 R09: ffffed101433ba0a
R10: ffff8880a19dd057 R11: 0000000000074071 R12: ffff8880a19dcc00
R13: ffff88802f86f9a8 R14: 0000000000000000 R15: 0000000000000001
FS: 00007f9f56ece700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
attempt to access beyond end of device
loop2: rw=0, want=184, limit=178
metapage_read_end_io: I/O error
CR2: 0000000000970004 CR3: 00000002307ec000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: df 48 89 fisttps -0x77(%rax)
3: c1 48 89 04 rorl $0x4,-0x77(%rax)
7: 24 83 and $0x83,%al
9: e0 07 loopne 0x12
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 8a 03 00 00 jne 0x3af
25: 44 89 f0 mov %r14d,%eax
28: 31 d2 xor %edx,%edx
* 2a: 41 f7 74 24 14 divl 0x14(%r12) <-- trapping instruction
2f: 49 89 c6 mov %rax,%r14
32: 49 8d 44 24 20 lea 0x20(%r12),%rax
37: 48 89 c2 mov %rax,%rdx
3a: 48 89 44 24 18 mov %rax,0x18(%rsp)
3f: 48 rex.W


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.