loop2: detected capacity change from 0 to 1024
EXT4-fs: Ignoring removed nomblk_io_submit option
EXT4-fs (loop2): mounted filesystem without journal. Quota mode: none.
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:1957!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 376 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:mb_mark_used+0x1545/0x1560 fs/ext4/mballoc.c:1957
Code: 0f 0b e8 2e 26 81 ff 0f 0b e8 27 26 81 ff 0f 0b e8 20 26 81 ff 0f 0b e8 19 26 81 ff 0f 0b e8 12 26 81 ff 0f 0b e8 0b 26 81 ff <0f> 0b e8 04 26 81 ff 0f 0b e8 fd 25 81 ff 0f 0b 66 2e 0f 1f 84 00
RSP: 0018:ffffc900009b7588 EFLAGS: 00010293
RAX: ffffffff81f05045 RBX: 0000000080000000 RCX: ffff888114643cc0
RDX: 0000000000000000 RSI: ffffffff80000000 RDI: 0000000000002000
RBP: ffffc900009b7668 R08: ffff888115dae003 R09: 1ffff11022bb5c00
R10: dffffc0000000000 R11: ffffed1022bb5c01 R12: ffffffff80000000
R13: 0000000000002000 R14: ffffc900009b7730 R15: ffff888115dad000
FS:  00005555787fe500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001100d9000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_trim_extent fs/ext4/mballoc.c:6456 [inline]
 ext4_try_to_trim_range+0x5d4/0xfb0 fs/ext4/mballoc.c:6516
 ext4_trim_all_free fs/ext4/mballoc.c:6578 [inline]
 ext4_trim_fs+0xbc8/0x1300 fs/ext4/mballoc.c:6669
 __ext4_ioctl fs/ext4/ioctl.c:1494 [inline]
 ext4_ioctl+0x26f9/0x3ee0 fs/ext4/ioctl.c:1617
 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:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efe8ff9cdd9
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:00007fff7115e578 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007efe90215fa0 RCX: 00007efe8ff9cdd9
RDX: 0000200000000080 RSI: 00000000c0185879 RDI: 0000000000000004
RBP: 00007efe90032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efe90215fac R14: 00007efe90215fa0 R15: 00007efe90215fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mb_mark_used+0x1545/0x1560 fs/ext4/mballoc.c:1957
Code: 0f 0b e8 2e 26 81 ff 0f 0b e8 27 26 81 ff 0f 0b e8 20 26 81 ff 0f 0b e8 19 26 81 ff 0f 0b e8 12 26 81 ff 0f 0b e8 0b 26 81 ff <0f> 0b e8 04 26 81 ff 0f 0b e8 fd 25 81 ff 0f 0b 66 2e 0f 1f 84 00
RSP: 0018:ffffc900009b7588 EFLAGS: 00010293
RAX: ffffffff81f05045 RBX: 0000000080000000 RCX: ffff888114643cc0
RDX: 0000000000000000 RSI: ffffffff80000000 RDI: 0000000000002000
RBP: ffffc900009b7668 R08: ffff888115dae003 R09: 1ffff11022bb5c00
R10: dffffc0000000000 R11: ffffed1022bb5c01 R12: ffffffff80000000
R13: 0000000000002000 R14: ffffc900009b7730 R15: ffff888115dad000
FS:  00005555787fe500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001100d9000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400