------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4374! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 311 Comm: syz.3.4 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+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: 0000:ffffc900077f6a60 EFLAGS: 00010287 RAX: ffffffff81def061 RBX: 00000000ffffffff RCX: 0000000000080000 RDX: ffffc90003373000 RSI: 000000000001fe7a RDI: 000000000001fe7b RBP: ffffc900077f6ae8 R08: ffff88810e17e000 R09: 1ffff110223b3e1b R10: dffffc0000000000 R11: ffffed10223b3e1c R12: 1ffff110223b3e1f R13: ffff888111d9f0f8 R14: 0000000000000080 R15: 0000000000000002 FS: 00007f650eed16c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000032000 CR3: 0000000129eb0000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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 call_write_iter include/linux/fs.h:2212 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x835/0xfd0 fs/read_write.c:594 ksys_pwrite64 fs/read_write.c:701 [inline] __do_sys_pwrite64 fs/read_write.c:711 [inline] __se_sys_pwrite64 fs/read_write.c:708 [inline] __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:708 x64_sys_call+0xa6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:19 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f6510476799 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:00007f650eed1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f65106effa0 RCX: 00007f6510476799 RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000007 RBP: 00007f651050cbd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f65106f0038 R14: 00007f65106effa0 R15: 00007ffdc0ddc298 Modules linked in: ---[ end trace 96009f3e17f22c67 ]--- 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: 0000:ffffc900077f6a60 EFLAGS: 00010287 RAX: ffffffff81def061 RBX: 00000000ffffffff RCX: 0000000000080000 RDX: ffffc90003373000 RSI: 000000000001fe7a RDI: 000000000001fe7b RBP: ffffc900077f6ae8 R08: ffff88810e17e000 R09: 1ffff110223b3e1b R10: dffffc0000000000 R11: ffffed10223b3e1c R12: 1ffff110223b3e1f R13: ffff888111d9f0f8 R14: 0000000000000080 R15: 0000000000000002 FS: 00007f650eed16c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000032000 CR3: 0000000129eb0000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400