Re: [syzbot] [raid?] kernel BUG in find_zone

[syzbot <syzbot+50f9bc7ab8eb224b7629@syzkaller.appspotmail.com>]

> #syz test: 

This crash does not have a reproducer. I cannot test it.

> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>
> Please test the attached patch.
>
> Thanks,
> Zizhi Wo
>
> 在 2026/9/16 20:57, syzbot 写道:
>> Hello,
>> 
>> syzbot found the following issue on:
>> 
>> HEAD commit:    50d05c7c76c9 Merge tag 'landlock-7.3-rc3' of git://git.ker..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=100769f9580000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=85bc5cc2fc7394d9
>> dashboard link: https://syzkaller.appspot.com/bug?extid=50f9bc7ab8eb224b7629
>> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
>> userspace arch: i386
>> 
>> Unfortunately, I don't have any reproducer for this issue yet.
>> 
>> Downloadable assets:
>> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-50d05c7c.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/303a0ade8f9e/vmlinux-50d05c7c.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/70b8ca71442b/bzImage-50d05c7c.xz
>> 
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+50f9bc7ab8eb224b7629@syzkaller.appspotmail.com
>> 
>> ------------[ cut here ]------------
>> kernel BUG at drivers/md/raid0.c:318!
>> Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
>> CPU: 1 UID: 0 PID: 8386 Comm: syz.2.584 Tainted: G             L      syzkaller #0 PREEMPT(full)
>> Tainted: [L]=SOFTLOCKUP
>> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
>> RIP: 0010:find_zone drivers/md/raid0.c:318 [inline]
>> RIP: 0010:find_zone.isra.0+0x129/0x150 drivers/md/raid0.c:305
>> Code: f9 48 89 e8 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 89 ef e8 a2 00 fe f9 e9 79 ff ff ff e8 c8 bf 8b f9 90 <0f> 0b 48 8b 3c 24 e8 8c 00 fe f9 e9 04 ff ff ff 48 89 df e8 7f 00
>> RSP: 0018:ffffc9000557f090 EFLAGS: 00010293
>> RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
>> RDX: ffff888022b34b00 RSI: ffffffff887fa208 RDI: ffff888022b34b00
>> RBP: ffff888042790b18 R08: 0000000000000004 R09: 0000000000000001
>> R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
>> R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
>> FS:  0000000000000000(0000) GS:ffff888096a60000(0063) knlGS:00000000f53fdb40
>> CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
>> CR2: 0000000033863fff CR3: 0000000070ae4000 CR4: 0000000000352ef0
>> Call Trace:
>>   <TASK>
>>   raid0_map_submit_bio drivers/md/raid0.c:568 [inline]
>>   raid0_make_request+0x299/0x1660 drivers/md/raid0.c:626
>>   md_handle_request+0x824/0x1230 drivers/md/md.c:417
>>   md_submit_bio+0x1e9/0x350 drivers/md/md.c:458
>>   __submit_bio block/blk-core.c:681 [inline]
>>   __submit_bio+0x20e/0x3d0 block/blk-core.c:670
>>   __submit_bio_noacct block/blk-core.c:724 [inline]
>>   submit_bio_noacct_nocheck+0x736/0xc00 block/blk-core.c:792
>>   submit_bio_noacct+0xc93/0x2130 block/blk-core.c:925
>>   blk_crypto_submit_bio include/linux/blk-crypto.h:212 [inline]
>>   __bh_submit+0x7ce/0xaa0 fs/buffer.c:1132
>>   bh_submit fs/buffer.c:1146 [inline]
>>   block_read_full_folio+0x496/0x8c0 fs/buffer.c:2373
>>   filemap_read_folio+0xfc/0x3b0 mm/filemap.c:2520
>>   do_read_cache_folio+0x2d7/0x6b0 mm/filemap.c:4156
>>   read_mapping_folio include/linux/pagemap.h:1015 [inline]
>>   read_part_sector+0xd1/0x370 block/partitions/core.c:724
>>   adfspart_check_ICS+0x91/0x7d0 block/partitions/acorn.c:357
>>   check_partition block/partitions/core.c:143 [inline]
>>   blk_add_partitions block/partitions/core.c:591 [inline]
>>   bdev_disk_changed+0x7b1/0x1260 block/partitions/core.c:695
>>   blkdev_get_whole+0x187/0x290 block/bdev.c:793
>>   bdev_open+0x2c7/0xe40 block/bdev.c:1002
>>   blkdev_open+0x34e/0x4f0 block/fops.c:674
>>   do_dentry_open+0x6ab/0x14d0 fs/open.c:996
>>   vfs_open+0x82/0x3f0 fs/open.c:1101
>>   do_open fs/namei.c:4837 [inline]
>>   path_openat+0x19fa/0x2440 fs/namei.c:5000
>>   do_file_open+0x20e/0x430 fs/namei.c:5029
>>   do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
>>   do_sys_open fs/open.c:1423 [inline]
>>   __do_compat_sys_openat fs/open.c:1485 [inline]
>>   __se_compat_sys_openat fs/open.c:1483 [inline]
>>   __ia32_compat_sys_openat+0x12d/0x210 fs/open.c:1483
>>   do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
>>   __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
>>   do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
>>   entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>> RIP: 0023:0xf700efec
>> Code: Unable to access opcode bytes at 0xf700efc2.
>> RSP: 002b:00000000f53fd50c EFLAGS: 00000292 ORIG_RAX: 0000000000000127
>> RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000080000300
>> RDX: 0000000000004002 RSI: 0000000000000000 RDI: 0000000000000000
>> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>>   </TASK>
>> Modules linked in:
>> ---[ end trace 0000000000000000 ]---
>> RIP: 0010:find_zone drivers/md/raid0.c:318 [inline]
>> RIP: 0010:find_zone.isra.0+0x129/0x150 drivers/md/raid0.c:305
>> Code: f9 48 89 e8 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 48 89 ef e8 a2 00 fe f9 e9 79 ff ff ff e8 c8 bf 8b f9 90 <0f> 0b 48 8b 3c 24 e8 8c 00 fe f9 e9 04 ff ff ff 48 89 df e8 7f 00
>> RSP: 0018:ffffc9000557f090 EFLAGS: 00010293
>> RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
>> RDX: ffff888022b34b00 RSI: ffffffff887fa208 RDI: ffff888022b34b00
>> RBP: ffff888042790b18 R08: 0000000000000004 R09: 0000000000000001
>> R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
>> R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
>> FS:  0000000000000000(0000) GS:ffff888096a60000(0063) knlGS:00000000f53fdb40
>> CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
>> CR2: 00000000f5315ff4 CR3: 0000000070ae4000 CR4: 0000000000352ef0
>> 
>> 
>> ---
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>> 
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>> 
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>> 
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>>