[syzbot] BUG: unable to handle kernel paging request in __blk_mq_alloc_requests

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syzbot

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Nov 1, 2021, 8:51:21 AM11/1/21
to ax...@kernel.dk, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: 503f375baa99 Add linux-next specific files for 20211028
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14688302b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=aa50dda6b6975803
dashboard link: https://syzkaller.appspot.com/bug?extid=cd20829ac44b92bf6ed0
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=1385446ab00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10fc8c6ab00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cd2082...@syzkaller.appspotmail.com

loop0: detected capacity change from 0 to 1
BUG: unable to handle page fault for address: ffffed101e501750
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffee067 P4D 23ffee067 PUD 13fff5067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6523 Comm: syz-executor279 Not tainted 5.15.0-rc7-next-20211028-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__blk_mq_alloc_requests_batch block/blk-mq.c:408 [inline]
RIP: 0010:__blk_mq_alloc_requests+0x4a7/0xb00 block/blk-mq.c:457
Code: e8 fd 48 8b 44 24 10 80 38 00 0f 85 a6 04 00 00 48 8b 44 24 08 45 89 ed 48 8b b0 88 00 00 00 4a 8d 1c ee 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 6c 04 00 00 44 8b ac 24 a0 00 00 00 48 8b 03
RSP: 0018:ffffc900027fea90 EFLAGS: 00010a06
RAX: 1ffff1101e501750 RBX: ffff8880f280ba80 RCX: 0000000000000000
RDX: ffff888017bd1d40 RSI: ffff888019f43000 RDI: 0000000000000003
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff838f31a1 R11: 0000000000000000 R12: 0000000000000000
R13: 000000001b119150 R14: dffffc0000000000 R15: ffffc900027fec28
FS: 00005555573e63c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed101e501750 CR3: 0000000021651000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
blk_mq_submit_bio+0xdac/0x1b40 block/blk-mq.c:2526
__submit_bio+0x794/0x8e0 block/blk-core.c:894
__submit_bio_noacct_mq block/blk-core.c:972 [inline]
submit_bio_noacct block/blk-core.c:998 [inline]
submit_bio_noacct+0x6c9/0x8a0 block/blk-core.c:987
submit_bio block/blk-core.c:1059 [inline]
submit_bio+0x1ea/0x430 block/blk-core.c:1017
mpage_bio_submit fs/mpage.c:66 [inline]
mpage_readahead+0x589/0x750 fs/mpage.c:393
read_pages+0x1e4/0xfa0 mm/readahead.c:129
page_cache_ra_unbounded+0x64b/0x940 mm/readahead.c:238
do_page_cache_ra mm/readahead.c:268 [inline]
ondemand_readahead+0x594/0x1090 mm/readahead.c:551
page_cache_sync_ra+0x1cb/0x200 mm/readahead.c:579
page_cache_sync_readahead include/linux/pagemap.h:980 [inline]
filemap_get_pages+0x2b2/0x1be0 mm/filemap.c:2556
filemap_read+0x315/0xeb0 mm/filemap.c:2642
generic_file_read_iter+0x3b6/0x5a0 mm/filemap.c:2792
blkdev_read_iter+0x117/0x200 block/fops.c:583
call_read_iter include/linux/fs.h:2156 [inline]
io_iter_do_read fs/io_uring.c:3462 [inline]
io_read+0x33c/0xff0 fs/io_uring.c:3519
io_issue_sqe+0x800/0x7010 fs/io_uring.c:6628
__io_queue_sqe fs/io_uring.c:6978 [inline]
io_queue_sqe fs/io_uring.c:7020 [inline]
io_submit_sqe fs/io_uring.c:7223 [inline]
io_submit_sqes+0x1bca/0x8a20 fs/io_uring.c:7329
__do_sys_io_uring_enter+0xf6e/0x1f50 fs/io_uring.c:10043
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: 0033:0x7f8a945379c9
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 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffea64277e8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8a945379c9
RDX: 0000000000000000 RSI: 00000000000002ff RDI: 0000000000000003
RBP: 00007ffea6427800 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
CR2: ffffed101e501750
---[ end trace dde64fe0ea4dcb18 ]---
RIP: 0010:__blk_mq_alloc_requests_batch block/blk-mq.c:408 [inline]
RIP: 0010:__blk_mq_alloc_requests+0x4a7/0xb00 block/blk-mq.c:457
Code: e8 fd 48 8b 44 24 10 80 38 00 0f 85 a6 04 00 00 48 8b 44 24 08 45 89 ed 48 8b b0 88 00 00 00 4a 8d 1c ee 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 6c 04 00 00 44 8b ac 24 a0 00 00 00 48 8b 03
RSP: 0018:ffffc900027fea90 EFLAGS: 00010a06
RAX: 1ffff1101e501750 RBX: ffff8880f280ba80 RCX: 0000000000000000
RDX: ffff888017bd1d40 RSI: ffff888019f43000 RDI: 0000000000000003
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff838f31a1 R11: 0000000000000000 R12: 0000000000000000
R13: 000000001b119150 R14: dffffc0000000000 R15: ffffc900027fec28
FS: 00005555573e63c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed101e501750 CR3: 0000000021651000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e8 fd 48 8b 44 callq 0x448b4902
5: 24 10 and $0x10,%al
7: 80 38 00 cmpb $0x0,(%rax)
a: 0f 85 a6 04 00 00 jne 0x4b6
10: 48 8b 44 24 08 mov 0x8(%rsp),%rax
15: 45 89 ed mov %r13d,%r13d
18: 48 8b b0 88 00 00 00 mov 0x88(%rax),%rsi
1f: 4a 8d 1c ee lea (%rsi,%r13,8),%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction
2f: 0f 85 6c 04 00 00 jne 0x4a1
35: 44 8b ac 24 a0 00 00 mov 0xa0(%rsp),%r13d
3c: 00
3d: 48 8b 03 mov (%rbx),%rax


---
This report is generated by a bot. It may contain errors.
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Jens Axboe

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Nov 1, 2021, 8:58:36 AM11/1/21
to syzbot, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
On 11/1/21 6:51 AM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 503f375baa99 Add linux-next specific files for 20211028
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=14688302b00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=aa50dda6b6975803
> dashboard link: https://syzkaller.appspot.com/bug?extid=cd20829ac44b92bf6ed0
> 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=1385446ab00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10fc8c6ab00000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+cd2082...@syzkaller.appspotmail.com
#syz test: git://git.kernel.dk/linux-block for-next

--
Jens Axboe

syzbot

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Nov 1, 2021, 9:16:12 AM11/1/21
to ax...@kernel.dk, linux...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+cd2082...@syzkaller.appspotmail.com

Tested on:

commit: d1c2a961 Merge branch 'for-5.16/block' into for-next
git tree: git://git.kernel.dk/linux-block for-next
kernel config: https://syzkaller.appspot.com/x/.config?x=bfca9240a79435af
dashboard link: https://syzkaller.appspot.com/bug?extid=cd20829ac44b92bf6ed0
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: testing is done by a robot and is best-effort only.
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