EXT4-fs (loop2): resizing filesystem from 0 to 8 blocks
------------[ cut here ]------------
kernel BUG at fs/ext4/resize.c:550!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 568 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:setup_new_flex_group_blocks fs/ext4/resize.c:549 [inline]
RIP: 0010:ext4_flex_group_add+0x4c2f/0x4c40 fs/ext4/resize.c:1559
Code: ff ff e8 c4 13 82 ff 0f 0b e8 bd 13 82 ff 0f 0b e8 b6 13 82 ff 0f 0b e8 af 13 82 ff 0f 0b e8 a8 13 82 ff 0f 0b e8 a1 13 82 ff <0f> 0b e8 9a 13 82 ff 0f 0b 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc90000a1f420 EFLAGS: 00010293
RAX: ffffffff81ec399f RBX: ffff88810c678400 RCX: ffff88810941a180
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000a1f6b0 R08: 0000000000000040 R09: 0000000000000003
R10: fffff52000143e5c R11: 1ffff92000143e5c R12: 1ffff110212abe00
R13: ffff888123379000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f1cc8f816c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1cc8f60d58 CR3: 000000012ba1a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_resize_fs+0x347d/0x4300 fs/ext4/resize.c:2174
 __ext4_ioctl fs/ext4/ioctl.c:1447 [inline]
 ext4_ioctl+0x2561/0x3b20 fs/ext4/ioctl.c:1614
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
 x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1cc818ebe9
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:00007f1cc8f81038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1cc83b5fa0 RCX: 00007f1cc818ebe9
RDX: 0000200000000140 RSI: 0000000040086610 RDI: 0000000000000004
RBP: 00007f1cc8211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1cc83b6038 R14: 00007f1cc83b5fa0 R15: 00007ffd6e3040a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:setup_new_flex_group_blocks fs/ext4/resize.c:549 [inline]
RIP: 0010:ext4_flex_group_add+0x4c2f/0x4c40 fs/ext4/resize.c:1559
Code: ff ff e8 c4 13 82 ff 0f 0b e8 bd 13 82 ff 0f 0b e8 b6 13 82 ff 0f 0b e8 af 13 82 ff 0f 0b e8 a8 13 82 ff 0f 0b e8 a1 13 82 ff <0f> 0b e8 9a 13 82 ff 0f 0b 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffc90000a1f420 EFLAGS: 00010293
RAX: ffffffff81ec399f RBX: ffff88810c678400 RCX: ffff88810941a180
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000a1f6b0 R08: 0000000000000040 R09: 0000000000000003
R10: fffff52000143e5c R11: 1ffff92000143e5c R12: 1ffff110212abe00
R13: ffff888123379000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f1cc8f816c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1cc8f5ff98 CR3: 000000012ba1a000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400