------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4374!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 13156 Comm: syz.2.3932 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_mb_use_inode_pa+0x6d1/0x730 fs/ext4/mballoc.c:4374
Code: 4c 89 ff e8 11 0b ca ff 48 ba 00 00 00 00 00 fc ff df e9 be fa ff ff e8 ad dc 8a ff 0f 0b e8 a6 dc 8a ff 0f 0b e8 9f dc 8a ff <0f> 0b e8 98 dc 8a ff 0f 0b 48 8b 4d d0 80 e1 07 80 c1 03 38 c1 0f
RSP: 0018:ffffc90000c26000 EFLAGS: 00010293
RAX: ffffffff81def061 RBX: 00000000ffffffff RCX: ffff88811349e2c0
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffffc90000c26088 R08: ffff88810b8c0000 R09: 1ffff1102520d3bf
R10: dffffc0000000000 R11: ffffed102520d3c0 R12: 1ffff1102520d3c3
R13: ffff888129069e18 R14: 0000000000000020 R15: 0000000000000002
FS:  00007fe404e816c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000021000 CR3: 00000001270d1000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0xb3b/0xcf0 fs/ext4/mballoc.c:4472
 ext4_mb_new_blocks+0x551/0x42c0 fs/ext4/mballoc.c:5779
 ext4_ext_map_blocks+0x1722/0x61e0 fs/ext4/extents.c:4341
 ext4_map_blocks+0x988/0x1b30 fs/ext4/inode.c:674
 _ext4_get_block+0x1ea/0x540 fs/ext4/inode.c:817
 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:848
 ext4_block_write_begin+0x563/0x1160 fs/ext4/inode.c:1102
 ext4_write_begin+0x65a/0x12e0 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x321/0xbf0 fs/ext4/inode.c:2988
 generic_perform_write+0x2b7/0x690 mm/filemap.c:3870
 ext4_buffered_write_iter+0x4ed/0x670 fs/ext4/file.c:270
 ext4_file_write_iter+0x440/0x1540 fs/ext4/file.c:-1
 __kernel_write+0x510/0x950 fs/read_write.c:539
 __dump_emit+0x246/0x370 fs/coredump.c:880
 dump_emit+0x383/0x3f0 fs/coredump.c:917
 dump_user_range+0x86/0x1c0 fs/coredump.c:954
 elf_core_dump+0x2a8f/0x2fd0 fs/binfmt_elf.c:2285
 do_coredump+0x1452/0x2950 fs/coredump.c:831
 get_signal+0x38d/0x1480 kernel/signal.c:2893
 arch_do_signal_or_restart+0xdf/0x11c0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:320
 irqentry_exit+0x12/0x40 kernel/entry/common.c:411
 exc_page_fault+0x5e/0xb0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7fe4064267a1
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fe40669ffa0 RCX: 00007fe406426799
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007fe4064bcbd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fe4066a0038 R14: 00007fe40669ffa0 R15: 00007ffed971c348
 </TASK>
Modules linked in:
---[ end trace 124b74b05ae55d4d ]---
RIP: 0010:ext4_mb_use_inode_pa+0x6d1/0x730 fs/ext4/mballoc.c:4374
Code: 4c 89 ff e8 11 0b ca ff 48 ba 00 00 00 00 00 fc ff df e9 be fa ff ff e8 ad dc 8a ff 0f 0b e8 a6 dc 8a ff 0f 0b e8 9f dc 8a ff <0f> 0b e8 98 dc 8a ff 0f 0b 48 8b 4d d0 80 e1 07 80 c1 03 38 c1 0f
RSP: 0018:ffffc90000c26000 EFLAGS: 00010293
RAX: ffffffff81def061 RBX: 00000000ffffffff RCX: ffff88811349e2c0
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffffc90000c26088 R08: ffff88810b8c0000 R09: 1ffff1102520d3bf
R10: dffffc0000000000 R11: ffffed102520d3c0 R12: 1ffff1102520d3c3
R13: ffff888129069e18 R14: 0000000000000020 R15: 0000000000000002
FS:  00007fe404e816c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000021000 CR3: 00000001270d1000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400