linux-kernel - Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline

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Message-ID: <68f3b3a7.050a0220.1186a4.0520.GAE@google.com>
Date: Sat, 18 Oct 2025 08:35:03 -0700
From: syzbot <syzbot+f3185be57d7e8dda32b8@...kaller.appspotmail.com>
To: kartikey406@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in __ext4_journal_stop

------------[ cut here ]------------
kernel BUG at fs/ext4/ext4_jbd2.c:54!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 7268 Comm: syz.3.141 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:ext4_put_nojournal fs/ext4/ext4_jbd2.c:54 [inline]
RIP: 0010:__ext4_journal_stop+0x191/0x1a0 fs/ext4/ext4_jbd2.c:126
Code: e8 e4 3e 50 ff e9 f8 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 10 ff ff ff e8 ba ee b5 ff e9 06 ff ff ff e8 c0 3e 50 ff 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000b107840 EFLAGS: 00010293
RAX: ffffffff826f6420 RBX: 0000000000000000 RCX: ffff88802e085ac0
RDX: 0000000000000000 RSI: 0000000000000361 RDI: ffffffff8d5e2286
RBP: ffffc9000b107968 R08: ffffea000175b077 R09: 1ffffd40002eb60e
R10: dffffc0000000000 R11: fffff940002eb60f R12: 0000000000000078
R13: 0000000000000361 R14: ffffffff8d5e2286 R15: ffff888074bb6bc8
FS:  00007ff117be16c0(0000) GS:ffff88812646b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555564fe588 CR3: 00000000546e9000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_write_inline_data_end+0x7a9/0xab0 fs/ext4/inline.c:865
 generic_perform_write+0x62a/0x900 mm/filemap.c:4263
 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:299
 ext4_file_write_iter+0x298/0x1bc0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff116d8eec9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff117be1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff116fe5fa0 RCX: 00007ff116d8eec9
RDX: 0000000000000078 RSI: 0000200000000600 RDI: 0000000000000005
RBP: 00007ff116e11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff116fe6038 R14: 00007ff116fe5fa0 R15: 00007ffd5125ed68
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_put_nojournal fs/ext4/ext4_jbd2.c:54 [inline]
RIP: 0010:__ext4_journal_stop+0x191/0x1a0 fs/ext4/ext4_jbd2.c:126
Code: e8 e4 3e 50 ff e9 f8 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 10 ff ff ff e8 ba ee b5 ff e9 06 ff ff ff e8 c0 3e 50 ff 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc9000b107840 EFLAGS: 00010293
RAX: ffffffff826f6420 RBX: 0000000000000000 RCX: ffff88802e085ac0
RDX: 0000000000000000 RSI: 0000000000000361 RDI: ffffffff8d5e2286
RBP: ffffc9000b107968 R08: ffffea000175b077 R09: 1ffffd40002eb60e
R10: dffffc0000000000 R11: fffff940002eb60f R12: 0000000000000078
R13: 0000000000000361 R14: ffffffff8d5e2286 R15: ffff888074bb6bc8
FS:  00007ff117be16c0(0000) GS:ffff88812636b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555593914808 CR3: 00000000546e9000 CR4: 0000000000350ef0


Tested on:

commit:         f406055c Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=173b2b04580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=308983f9c02338e8
dashboard link: https://syzkaller.appspot.com/bug?extid=f3185be57d7e8dda32b8
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17b5767c580000