EXT4-fs error (device loop2): ext4_dirty_inode:6133: inode #2: comm syz.2.4183: mark_inode_dirty error
EXT4-fs error (device loop2): ext4_do_update_inode:5268: inode #2: comm syz.2.4183: corrupted inode contents
EXT4-fs error (device loop2): __ext4_ext_dirty:206: inode #2: comm syz.2.4183: mark_inode_dirty error
BUG: unable to handle page fault for address: ffffffffffffff93
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD c891067 P4D c891067 PUD c893067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 18297 Comm: syz.2.4183 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_ext_drop_refs fs/ext4/extents.c:119 [inline]
RIP: 0010:ext4_free_ext_path fs/ext4/extents.c:128 [inline]
RIP: 0010:ext4_ext_map_blocks+0x362d/0x6870 fs/ext4/extents.c:4497
Code: 18 4c 8b b4 24 60 01 00 00 4d 85 f6 0f 84 b2 00 00 00 49 8d 7e 08 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 aa 12 00 00 <41> 0f b7 46 08 c1 e0 04 48 8d 04 40 48 89 44 24 50 49 8d 46 28 48
RSP: 0018:ffffc9000c4274c0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888054ba16c0 RCX: 0000000000080000
RDX: ffffc9001c7a9000 RSI: 00000000000131ae RDI: ffffffffffffff93
RBP: ffffc9000c427790 R08: ffff88805494f14b R09: 1ffff1100a929e29
R10: dffffc0000000000 R11: ffffed100a929e2a R12: dffffc0000000000
R13: 1ffff92001884ec8 R14: ffffffffffffff8b R15: 0000000000000001
FS:  00007fe6296ae6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 000000002e74c000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 ext4_map_blocks+0x9de/0x1b70 fs/ext4/inode.c:679
 ext4_getblk+0x1cc/0x6f0 fs/ext4/inode.c:890
 ext4_bread+0x26/0x170 fs/ext4/inode.c:946
 ext4_append+0x2be/0x560 fs/ext4/namei.c:83
 ext4_add_entry+0x8eb/0xdb0 fs/ext4/namei.c:2511
 ext4_mkdir+0x558/0xce0 fs/ext4/namei.c:3081
 vfs_mkdir+0x387/0x570 fs/namei.c:4114
 do_mkdirat+0x1d8/0x440 fs/namei.c:4139
 __do_sys_mkdirat fs/namei.c:4154 [inline]
 __se_sys_mkdirat fs/namei.c:4152 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4152
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe62879b687
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 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:00007fe6296ade58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fe6296adee0 RCX: 00007fe62879b687
RDX: 00000000000001ff RSI: 0000200000000000 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fe6296adea0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
CR2: ffffffffffffff93
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_ext_drop_refs fs/ext4/extents.c:119 [inline]
RIP: 0010:ext4_free_ext_path fs/ext4/extents.c:128 [inline]
RIP: 0010:ext4_ext_map_blocks+0x362d/0x6870 fs/ext4/extents.c:4497
Code: 18 4c 8b b4 24 60 01 00 00 4d 85 f6 0f 84 b2 00 00 00 49 8d 7e 08 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 aa 12 00 00 <41> 0f b7 46 08 c1 e0 04 48 8d 04 40 48 89 44 24 50 49 8d 46 28 48
RSP: 0018:ffffc9000c4274c0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888054ba16c0 RCX: 0000000000080000
RDX: ffffc9001c7a9000 RSI: 00000000000131ae RDI: ffffffffffffff93
RBP: ffffc9000c427790 R08: ffff88805494f14b R09: 1ffff1100a929e29
R10: dffffc0000000000 R11: ffffed100a929e2a R12: dffffc0000000000
R13: 1ffff92001884ec8 R14: ffffffffffffff8b R15: 0000000000000001
FS:  00007fe6296ae6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 000000002e74c000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	18 4c 8b b4          	sbb    %cl,-0x4c(%rbx,%rcx,4)
   4:	24 60                	and    $0x60,%al
   6:	01 00                	add    %eax,(%rax)
   8:	00 4d 85             	add    %cl,-0x7b(%rbp)
   b:	f6 0f 84             	testb  $0x84,(%rdi)
   e:	b2 00                	mov    $0x0,%dl
  10:	00 00                	add    %al,(%rax)
  12:	49 8d 7e 08          	lea    0x8(%r14),%rdi
  16:	48 89 f8             	mov    %rdi,%rax
  19:	48 c1 e8 03          	shr    $0x3,%rax
  1d:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax
  22:	84 c0                	test   %al,%al
  24:	0f 85 aa 12 00 00    	jne    0x12d4
* 2a:	41 0f b7 46 08       	movzwl 0x8(%r14),%eax <-- trapping instruction
  2f:	c1 e0 04             	shl    $0x4,%eax
  32:	48 8d 04 40          	lea    (%rax,%rax,2),%rax
  36:	48 89 44 24 50       	mov    %rax,0x50(%rsp)
  3b:	49 8d 46 28          	lea    0x28(%r14),%rax
  3f:	48                   	rex.W