linux-kernel - Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data

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Message-ID: <672dec64.050a0220.69fce.000f.GAE@google.com>
Date: Fri, 08 Nov 2024 02:48:04 -0800
From: syzbot <syzbot+0c89d865531d053abb2d@...kaller.appspotmail.com>
To: crashfixer001@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data_end (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in ext4_write_inline_data_end

------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:235!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5696 Comm: syz-executor.5 Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:ext4_write_inline_data fs/ext4/inline.c:235 [inline]
RIP: 0010:ext4_write_inline_data_end+0xea2/0x1020 fs/ext4/inline.c:774
Code: 31 ff e8 e1 b8 37 ff 48 89 d8 48 25 ff 0f 00 00 74 70 e8 f1 b3 37 ff e9 12 f8 ff ff e8 e7 b3 37 ff 90 0f 0b e8 df b3 37 ff 90 <0f> 0b 48 8b 5c 24 18 48 89 df be 08 00 00 00 e8 ca 81 a1 ff 48 c1
RSP: 0018:ffffc90002fc7860 EFLAGS: 00010293
RAX: ffffffff825cffc1 RBX: 000000000000003c RCX: ffff88802841bc00
RDX: 0000000000000000 RSI: 000000000000003c RDI: 000000000000084c
RBP: ffffc90002fc7988 R08: ffffffff825cf51a R09: 1ffff1100aec7470
R10: dffffc0000000000 R11: ffffed100aec7471 R12: ffff888068c3885a
R13: 000000000000000c R14: 000000000000084c R15: 0000000000000ff4
FS:  00007f085c26f6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020425000 CR3: 0000000054da0000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 generic_perform_write+0x4dd/0x6d0 mm/filemap.c:4069
 ext4_buffered_write_iter+0xc5/0x350 fs/ext4/file.c:299
 ext4_file_write_iter+0x1dd/0x1a20
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xaed/0xd30 fs/read_write.c:683
 ksys_write+0x183/0x2b0 fs/read_write.c:736
 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: 0033:0x7f085b47dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f085c26f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f085b5ac050 RCX: 00007f085b47dda9
RDX: 000000000208e24b RSI: 00000000200007c0 RDI: 0000000000000005
RBP: 00007f085b4ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f085b5ac050 R15: 00007ffd03c46858
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_write_inline_data fs/ext4/inline.c:235 [inline]
RIP: 0010:ext4_write_inline_data_end+0xea2/0x1020 fs/ext4/inline.c:774
Code: 31 ff e8 e1 b8 37 ff 48 89 d8 48 25 ff 0f 00 00 74 70 e8 f1 b3 37 ff e9 12 f8 ff ff e8 e7 b3 37 ff 90 0f 0b e8 df b3 37 ff 90 <0f> 0b 48 8b 5c 24 18 48 89 df be 08 00 00 00 e8 ca 81 a1 ff 48 c1
RSP: 0018:ffffc90002fc7860 EFLAGS: 00010293

RAX: ffffffff825cffc1 RBX: 000000000000003c RCX: ffff88802841bc00
RDX: 0000000000000000 RSI: 000000000000003c RDI: 000000000000084c
RBP: ffffc90002fc7988 R08: ffffffff825cf51a R09: 1ffff1100aec7470
R10: dffffc0000000000 R11: ffffed100aec7471 R12: ffff888068c3885a
R13: 000000000000000c R14: 000000000000084c R15: 0000000000000ff4
FS:  00007f085c26f6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd3d57ab78 CR3: 0000000054da0000 CR4: 0000000000350ef0


Tested on:

commit:         906bd684 Merge tag 'spi-fix-v6.12-rc6' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=176eee30580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ef3e3033284fe956
dashboard link: https://syzkaller.appspot.com/bug?extid=0c89d865531d053abb2d
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.