EXT4-fs (loop9): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
------------[ cut here ]------------
kernel BUG at fs/ext4/ext4_extents.h:193!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 8704 Comm: syz.9.339 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_ext_mark_unwritten fs/ext4/ext4_extents.h:193 [inline]
RIP: 0010:ext4_ext_map_blocks+0x5521/0x58b0 fs/ext4/extents.c:4453
Code: 06 af ff ff e8 b0 5a 4e ff 48 c7 c7 80 d6 e2 8d be 04 00 00 00 e8 5f e1 32 ff 65 48 ff 43 08 e9 e6 ae ff ff e8 90 5a 4e ff 90 <0f> 0b e8 88 5a 4e ff 90 0f 0b e8 80 5a 4e ff 90 0f 0b e8 78 5a 4e
RSP: 0018:ffffc9001238ef60 EFLAGS: 00010283
RAX: ffffffff8275f850 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90006f92000 RSI: 000000000000d48e RDI: 000000000000d48f
RBP: ffffc9001238f240 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ed44b7 R12: 1ffff92002471e1c
R13: 0000000000000003 R14: 00000000000001c1 R15: 0000000000000000
FS:  0000[  298.651065][ T8704] FS:  00007f0b370f66c0(0000) GS:ffff888126343000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b2ece1000 CR3: 0000000040192000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_map_create_blocks+0x11d/0x540 fs/ext4/inode.c:616
 ext4_map_blocks+0x7cd/0x11d0 fs/ext4/inode.c:809
 _ext4_get_block+0x1e3/0x470 fs/ext4/inode.c:909
 ext4_get_block_unwritten+0x2e/0x100 fs/ext4/inode.c:942
 ext4_block_write_begin+0xb14/0x1950 fs/ext4/inode.c:1196
 ext4_write_begin+0xb40/0x18c0 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x355/0xd90 fs/ext4/inode.c:3123
 generic_perform_write+0x2af/0x8b0 mm/filemap.c:4314
 ext4_buffered_write_iter+0xd0/0x3a0 fs/ext4/file.c:300
 ext4_file_write_iter+0x299/0x1c10 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x629/0xba0 fs/read_write.c:688
 ksys_pwrite64 fs/read_write.c:795 [inline]
 __do_sys_pwrite64 fs/read_write.c:803 [inline]
 __se_sys_pwrite64 fs/read_write.c:800 [inline]
 __x64_sys_pwrite64+0x19c/0x230 fs/read_write.c:800
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b38e9c629
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:00007f0b370f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f0b39115fa0 RCX: 00007f0b38e9c629
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000007
RBP: 00007f0b38f32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000c00 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0b39116038 R14: 00007f0b39115fa0 R15: 00007ffd1d3115a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_ext_mark_unwritten fs/ext4/ext4_extents.h:193 [inline]
RIP: 0010:ext4_ext_map_blocks+0x5521/0x58b0 fs/ext4/extents.c:4453
Code: 06 af ff ff e8 b0 5a 4e ff 48 c7 c7 80 d6 e2 8d be 04 00 00 00 e8 5f e1 32 ff 65 48 ff 43 08 e9 e6 ae ff ff e8 90 5a 4e ff 90 <0f> 0b e8 88 5a 4e ff 90 0f 0b e8 80 5a 4e ff 90 0f 0b e8 78 5a 4e
RSP: 0018:ffffc9001238ef60 EFLAGS: 00010283
RAX: ffffffff8275f850 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90006f92000 RSI: 000000000000d48e RDI: 000000000000d48f
RBP: ffffc9001238f240 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ed44b7 R12: 1ffff92002471e1c
R13: 0000000000000003 R14: 00000000000001c1 R15: 0000000000000000
FS:  00007f0b370f66c0(0000) GS:ffff888126443000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b2ece7000 CR3: 0000000040192000 CR4: 00000000003526f0