Re: [syzbot] [ext4?] kernel BUG in ext4_write_inline_data (5)

[syzbot <syzbot+53c8bd6136cfbe85197e@syzkaller.appspotmail.com>]

syzbot has found a reproducer for the following issue on:

HEAD commit:    a635d6748234 Merge tag 'v7.2-rc2-smb3-server-fixes' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10c8b0b9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8578cb30af0c1c29
dashboard link: https://syzkaller.appspot.com/bug?extid=53c8bd6136cfbe85197e
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12d41346580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5cfb3b35578d/disk-a635d674.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4f49a13f1718/vmlinux-a635d674.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1c79dac0ba82/bzImage-a635d674.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/e19a0b652c4c/mount_0.gz
  fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=125ac0b9580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+53c8bd6136cfbe85197e@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:240!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 6277 Comm: syz.5.64 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:ext4_write_inline_data+0x40b/0x4f0 fs/ext4/inline.c:240
Code: fe e8 e9 e7 36 ff 42 8d 44 23 c4 bb 3c 00 00 00 89 44 24 08 44 29 e3 e9 aa fe ff ff e8 ce e7 36 ff 90 0f 0b e8 c6 e7 36 ff 90 <0f> 0b e8 be e7 36 ff 48 8d 3d f7 52 56 0e 48 c7 c2 e0 95 ed 8b 4c
RSP: 0018:ffffc90003d7f8e0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000078 RCX: ffffffff82d2c53b
RDX: ffff8880280cdd00 RSI: ffffffff82d2c75a RDI: ffff8880280cdd00
RBP: ffff88807127e000 R08: 0000000000000006 R09: 0000000000000080
R10: 000000000000003c R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000080 R14: ffffc90003d7f980 R15: ffff88807127e58a
FS:  00007f45fb4396c0(0000) GS:ffff888123eed000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff59e5b7000 CR3: 000000007855a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_write_inline_data_end+0x2a8/0xdb0 fs/ext4/inline.c:825
 ext4_da_write_end+0x51e/0xe70 fs/ext4/inode.c:3305
 generic_perform_write+0x513/0xa40 mm/filemap.c:4379
 ext4_buffered_write_iter+0xdc/0x3b0 fs/ext4/file.c:316
 ext4_file_write_iter+0xa2f/0x1cb0 fs/ext4/file.c:735
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f45fa59de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f45fb439028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f45fa825fa0 RCX: 00007f45fa59de59
RDX: 0000000000000078 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f45fa633e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f45fa826038 R14: 00007f45fa825fa0 R15: 00007fff8e2c70e8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_write_inline_data+0x40b/0x4f0 fs/ext4/inline.c:240
Code: fe e8 e9 e7 36 ff 42 8d 44 23 c4 bb 3c 00 00 00 89 44 24 08 44 29 e3 e9 aa fe ff ff e8 ce e7 36 ff 90 0f 0b e8 c6 e7 36 ff 90 <0f> 0b e8 be e7 36 ff 48 8d 3d f7 52 56 0e 48 c7 c2 e0 95 ed 8b 4c
RSP: 0018:ffffc90003d7f8e0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000078 RCX: ffffffff82d2c53b
RDX: ffff8880280cdd00 RSI: ffffffff82d2c75a RDI: ffff8880280cdd00
RBP: ffff88807127e000 R08: 0000000000000006 R09: 0000000000000080
R10: 000000000000003c R11: 0000000000000000 R12: 0000000000000008
R13: 0000000000000080 R14: ffffc90003d7f980 R15: ffff88807127e58a
FS:  00007f45fb4396c0(0000) GS:ffff888123ded000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff59e5b6000 CR3: 000000007855a000 CR4: 0000000000350ef0


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