loop3: detected capacity change from 0 to 512
EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000d40000 r/w without journal. Quota mode: writeback.
ext4 filesystem being mounted at /0/file0 supports timestamps until 2038-01-19 (0x7fffffff)
EXT4-fs (loop3): resizing filesystem from 0 to 8 blocks
------------[ cut here ]------------
kernel BUG at fs/ext4/resize.c:548!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 501 Comm: syz.3.20 Not tainted syzkaller #0 PREEMPT 
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:547 [inline]
RIP: 0010:ext4_flex_group_add+0x4a48/0x4a60 fs/ext4/resize.c:1556
Code: ff ff e8 5b c1 64 ff 0f 0b e8 54 c1 64 ff 0f 0b e8 4d c1 64 ff 0f 0b e8 46 c1 64 ff 0f 0b e8 3f c1 64 ff 0f 0b e8 38 c1 64 ff <0f> 0b e8 31 c1 64 ff 0f 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc90000a27440 EFLAGS: 00010293
RAX: ffffffff823adbe8 RBX: ffff88811f4e6400 RCX: ffff88811f22a200
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000a276d0 R08: 0000000000000020 R09: ffffffff81f6bd1c
R10: ffffffff81f6bd1c R11: ffffffff81f692b6 R12: 1ffff110240214c0
R13: ffff88811f6ea000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f28926c96c0(0000) GS:ffff88826e6ff000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28926a8d58 CR3: 000000011f43a000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ext4_resize_fs+0x383b/0x4350 fs/ext4/resize.c:2165
 __ext4_ioctl fs/ext4/ioctl.c:1453 [inline]
 ext4_ioctl+0x2330/0x33f0 fs/ext4/ioctl.c:1626
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0x11f/0x1a0 fs/ioctl.c:584
 __x64_sys_ioctl+0x7b/0xa0 fs/ioctl.c:584
 x64_sys_call+0x1834/0x2fd0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x5e/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f289178ebe9
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:00007f28926c9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f28919b5fa0 RCX: 00007f289178ebe9
RDX: 0000200000000140 RSI: 0000000040086610 RDI: 0000000000000004
RBP: 00007f2891811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f28919b6038 R14: 00007f28919b5fa0 R15: 00007ffe37b76ab8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:setup_new_flex_group_blocks fs/ext4/resize.c:547 [inline]
RIP: 0010:ext4_flex_group_add+0x4a48/0x4a60 fs/ext4/resize.c:1556
Code: ff ff e8 5b c1 64 ff 0f 0b e8 54 c1 64 ff 0f 0b e8 4d c1 64 ff 0f 0b e8 46 c1 64 ff 0f 0b e8 3f c1 64 ff 0f 0b e8 38 c1 64 ff <0f> 0b e8 31 c1 64 ff 0f 0b 66 66 66 66 66 66 2e 0f 1f 84 00 00 00
RSP: 0018:ffffc90000a27440 EFLAGS: 00010293
RAX: ffffffff823adbe8 RBX: ffff88811f4e6400 RCX: ffff88811f22a200
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000a276d0 R08: 0000000000000020 R09: ffffffff81f6bd1c
R10: ffffffff81f6bd1c R11: ffffffff81f692b6 R12: 1ffff110240214c0
R13: ffff88811f6ea000 R14: 0000000000000000 R15: 0000000000000001
FS:  00007f28926c96c0(0000) GS:ffff88826e7ff000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f28926a7f98 CR3: 000000011f43a000 CR4: 00000000003526b0