------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:3845!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 2373 Comm: syz.1.500 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_mb_use_inode_pa+0x511/0x520 fs/ext4/mballoc.c:3845
Code: c1 03 38 c1 0f 8c 1b fe ff ff 4c 89 ff e8 07 5d ca ff e9 0e fe ff ff e8 5d dc 8f ff 0f 0b e8 56 dc 8f ff 0f 0b e8 4f dc 8f ff <0f> 0b e8 48 dc 8f ff 0f 0b 66 0f 1f 44 00 00 55 48 89 e5 41 57 41
RSP: 0018:ffffc900012b6a78 EFLAGS: 00010283
RAX: ffffffff81d4d701 RBX: 00000000ffffffff RCX: 0000000000080000
RDX: ffffc9000653c000 RSI: 0000000000009996 RDI: 0000000000009997
RBP: ffffc900012b6ae8 R08: ffff88811c1f1037 R09: 1ffff1102383e206
R10: dffffc0000000000 R11: ffffed102383e207 R12: 0000000000000003
R13: dffffc0000000000 R14: 1ffff1102383e20a R15: ffff88811c1f1050
FS:  00007f973d4cf6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9806fda558 CR3: 000000010e8eb000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_mb_use_preallocated+0xacc/0xc80 fs/ext4/mballoc.c:3943
 ext4_mb_new_blocks+0x5df/0x4340 fs/ext4/mballoc.c:5247
 ext4_ext_map_blocks+0x1679/0x5dd0 fs/ext4/extents.c:4341
 ext4_map_blocks+0x985/0x1bd0 fs/ext4/inode.c:674
 _ext4_get_block+0x1d1/0x4e0 fs/ext4/inode.c:817
 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:848
 ext4_block_write_begin+0x573/0x1340 fs/ext4/inode.c:1101
 ext4_write_begin+0x67e/0x1690 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x478/0xf10 fs/ext4/inode.c:3033
 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509
 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271
 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2066 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x758/0xdc0 fs/read_write.c:605
 ksys_pwrite64 fs/read_write.c:712 [inline]
 __do_sys_pwrite64 fs/read_write.c:722 [inline]
 __se_sys_pwrite64 fs/read_write.c:719 [inline]
 __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:719
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f973ea95799
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:00007f973d4cf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f973ed0f090 RCX: 00007f973ea95799
RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007f973eb2bbd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f973ed0f128 R14: 00007f973ed0f090 R15: 00007ffc679e4b18
Modules linked in:
---[ end trace cbcb5cfb6a392fd0 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x511/0x520 fs/ext4/mballoc.c:3845
Code: c1 03 38 c1 0f 8c 1b fe ff ff 4c 89 ff e8 07 5d ca ff e9 0e fe ff ff e8 5d dc 8f ff 0f 0b e8 56 dc 8f ff 0f 0b e8 4f dc 8f ff <0f> 0b e8 48 dc 8f ff 0f 0b 66 0f 1f 44 00 00 55 48 89 e5 41 57 41
RSP: 0018:ffffc900012b6a78 EFLAGS: 00010283
RAX: ffffffff81d4d701 RBX: 00000000ffffffff RCX: 0000000000080000
RDX: ffffc9000653c000 RSI: 0000000000009996 RDI: 0000000000009997
RBP: ffffc900012b6ae8 R08: ffff88811c1f1037 R09: 1ffff1102383e206
R10: dffffc0000000000 R11: ffffed102383e207 R12: 0000000000000003
R13: dffffc0000000000 R14: 1ffff1102383e20a R15: ffff88811c1f1050
FS:  00007f973d4cf6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9806fda558 CR3: 000000010e8eb000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400