------------[ cut here ]------------ kernel BUG at fs/ext4/extents.c:4491! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 678 Comm: syz.1.28 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:ext4_alloc_file_blocks+0xb3d/0xb40 fs/ext4/extents.c:4491 Code: 8b 4c 24 10 80 e1 07 fe c1 38 c1 0f 8c 82 f6 ff ff 48 8b 7c 24 10 e8 42 ef d1 ff e9 73 f6 ff ff e8 18 29 ee 02 e8 a3 25 8f ff <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 89 cb 41 89 d6 49 RSP: 0018:ffffc90001067b80 EFLAGS: 00010293 RAX: ffffffff81df3c8d RBX: 0000000000000003 RCX: ffff88810e8190c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001067d00 R08: dffffc0000000000 R09: ffffed10267e133f R10: ffffed10267e133f R11: 1ffff110267e133e R12: ffff888133f099f0 R13: ffff888133f09ac8 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fe6920716c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0a53623f98 CR3: 0000000119c9a000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_zero_range+0x449/0xd00 fs/ext4/extents.c:4641 ext4_fallocate+0x56a/0x1dd0 fs/ext4/extents.c:4776 vfs_fallocate+0x4c5/0x5a0 fs/open.c:323 ksys_fallocate fs/open.c:346 [inline] __do_sys_fallocate fs/open.c:354 [inline] __se_sys_fallocate fs/open.c:352 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:352 x64_sys_call+0x7fa/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286 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: 0033:0x7fe69118eec9 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:00007fe692071038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fe6913e6090 RCX: 00007fe69118eec9 RDX: 0000000000000002 RSI: 0000000000000010 RDI: 0000000000000004 RBP: 00007fe691211f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000007fff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe6913e6128 R14: 00007fe6913e6090 R15: 00007ffd4ea14708 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_alloc_file_blocks+0xb3d/0xb40 fs/ext4/extents.c:4491 Code: 8b 4c 24 10 80 e1 07 fe c1 38 c1 0f 8c 82 f6 ff ff 48 8b 7c 24 10 e8 42 ef d1 ff e9 73 f6 ff ff e8 18 29 ee 02 e8 a3 25 8f ff <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 89 cb 41 89 d6 49 RSP: 0018:ffffc90001067b80 EFLAGS: 00010293 RAX: ffffffff81df3c8d RBX: 0000000000000003 RCX: ffff88810e8190c0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001067d00 R08: dffffc0000000000 R09: ffffed10267e133f R10: ffffed10267e133f R11: 1ffff110267e133e R12: ffff888133f099f0 R13: ffff888133f09ac8 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fe6920716c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c006d35000 CR3: 0000000119c9a000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400