Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data (3)

[syzbot <syzbot+f3185be57d7e8dda32b8@syzkaller.appspotmail.com>]

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: 7077 Comm: syz.2.139 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 f4 39 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 d0 39 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:ffffc90005097840 EFLAGS: 00010293
RAX: ffffffff826f68f0 RBX: 0000000000000000 RCX: ffff88802c95bc80
RDX: 0000000000000000 RSI: 000000000000034f RDI: ffffffff8d5e1065
RBP: ffffc90005097968 R08: ffffea0001c01337 R09: 1ffffd4000380266
R10: dffffc0000000000 R11: fffff94000380267 R12: 0000000000000078
R13: 000000000000034f R14: ffffffff8d5e1065 R15: ffff888072ba0298
FS:  00007fbd8db566c0(0000) GS:ffff88812646d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000674 CR3: 000000005d163000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_write_inline_data_end+0x7a9/0xab0 fs/ext4/inline.c:847
 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: 0033:0x7fbd8cd8eec9
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:00007fbd8db56038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fbd8cfe5fa0 RCX: 00007fbd8cd8eec9
RDX: 0000000000000078 RSI: 0000200000000600 RDI: 0000000000000005
RBP: 00007fbd8ce11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbd8cfe6038 R14: 00007fbd8cfe5fa0 R15: 00007ffdf5505328
 </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 f4 39 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 d0 39 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:ffffc90005097840 EFLAGS: 00010293
RAX: ffffffff826f68f0 RBX: 0000000000000000 RCX: ffff88802c95bc80
RDX: 0000000000000000 RSI: 000000000000034f RDI: ffffffff8d5e1065
RBP: ffffc90005097968 R08: ffffea0001c01337 R09: 1ffffd4000380266
R10: dffffc0000000000 R11: fffff94000380267 R12: 0000000000000078
R13: 000000000000034f R14: ffffffff8d5e1065 R15: ffff888072ba0298
FS:  00007fbd8db566c0(0000) GS:ffff88812636d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab1c171880 CR3: 000000005d163000 CR4: 0000000000350ef0


Tested on:

commit:         211ddde0 Linux 6.18-rc2
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=113e8de2580000
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=15536b04580000