Message-ID: <67162374.050a0220.10f4f4.0045.GAE@google.com>
Date: Mon, 21 Oct 2024 02:48:36 -0700
From: syzbot <syzbot+985ada84bf055a575c07@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, brauner@...nel.org, konishi.ryusuke@...il.com, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-nilfs@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [nilfs] [fs] kernel BUG in submit_bh_wbc (3)

syzbot has found a reproducer for the following issue on:

HEAD commit:    42f7652d3eb5 Linux 6.12-rc4
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=10c66a40580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=41330fd2db03893d
dashboard link: https://syzkaller.appspot.com/bug?extid=985ada84bf055a575c07
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1541e430580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1181e0a7980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/21f56ec05989/disk-42f7652d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d295ea00e68a/vmlinux-42f7652d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6c4b95c7f67f/bzImage-42f7652d.xz
mounted in repro #1: https://storage.googleapis.com/syzbot-assets/709e6e32762f/mount_0.gz
mounted in repro #2: https://storage.googleapis.com/syzbot-assets/6576d8861c23/mount_7.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+985ada84bf055a575c07@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/buffer.c:2785!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 5235 Comm: syz-executor372 Not tainted 6.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:submit_bh_wbc+0x556/0x560 fs/buffer.c:2785
Code: 89 fa e8 dd 76 cc 02 e9 95 fe ff ff e8 73 85 74 ff 90 0f 0b e8 6b 85 74 ff 90 0f 0b e8 63 85 74 ff 90 0f 0b e8 5b 85 74 ff 90 <0f> 0b e8 53 85 74 ff 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003b6f0d8 EFLAGS: 00010293
RAX: ffffffff82206235 RBX: 0000000000000154 RCX: ffff88802d490000
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: 0000000000000100 R08: ffffffff82205df9 R09: 1ffff1100ef571d0
R10: dffffc0000000000 R11: ffffed100ef571d1 R12: 0000000000000000
R13: ffff888077ab8e80 R14: 0000000000000000 R15: 1ffff1100ef571d0
FS:  0000555573f7e380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbda422e00a CR3: 000000002fc1e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 submit_bh fs/buffer.c:2824 [inline]
 block_read_full_folio+0x93b/0xcd0 fs/buffer.c:2451
 do_mpage_readpage+0x1a73/0x1c80 fs/mpage.c:317
 mpage_read_folio+0x108/0x1e0 fs/mpage.c:392
 filemap_read_folio+0x14b/0x630 mm/filemap.c:2367
 do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3825
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 nilfs_get_folio+0x4b/0x240 fs/nilfs2/dir.c:190
 nilfs_find_entry+0x13d/0x660 fs/nilfs2/dir.c:313
 nilfs_inode_by_name+0xad/0x240 fs/nilfs2/dir.c:394
 nilfs_lookup+0xed/0x210 fs/nilfs2/namei.c:63
 lookup_open fs/namei.c:3573 [inline]
 open_last_lookups fs/namei.c:3694 [inline]
 path_openat+0x11a7/0x3590 fs/namei.c:3930
 do_filp_open+0x235/0x490 fs/namei.c:3960
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbda41e54a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 18 00 00 90 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:00007ffe5e610168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fbda41e54a9
RDX: 000000000000275a RSI: 0000000020000180 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 00000000000051a5 R09: 000000002000a440
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe5e61019c
R13: 0000000000000007 R14: 431bde82d7b634db R15: 00007ffe5e6101d0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:submit_bh_wbc+0x556/0x560 fs/buffer.c:2785
Code: 89 fa e8 dd 76 cc 02 e9 95 fe ff ff e8 73 85 74 ff 90 0f 0b e8 6b 85 74 ff 90 0f 0b e8 63 85 74 ff 90 0f 0b e8 5b 85 74 ff 90 <0f> 0b e8 53 85 74 ff 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90003b6f0d8 EFLAGS: 00010293
RAX: ffffffff82206235 RBX: 0000000000000154 RCX: ffff88802d490000
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: 0000000000000100 R08: ffffffff82205df9 R09: 1ffff1100ef571d0
R10: dffffc0000000000 R11: ffffed100ef571d1 R12: 0000000000000000
R13: ffff888077ab8e80 R14: 0000000000000000 R15: 1ffff1100ef571d0
FS:  0000555573f7e380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbd9cbff000 CR3: 000000002fc1e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

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