EXT4-fs error (device loop5): ext4_dirty_inode:6133: inode #2: comm syz.5.1302: mark_inode_dirty error
EXT4-fs error (device loop5): ext4_do_update_inode:5268: inode #2: comm syz.5.1302: corrupted inode contents
EXT4-fs error (device loop5): __ext4_ext_dirty:206: inode #2: comm syz.5.1302: 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: 10333 Comm: syz.5.1302 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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:ffffc90004daf060 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88805447e700 RCX: 0000000000080000
RDX: ffffc9001c901000 RSI: 000000000001af6d RDI: ffffffffffffff93
RBP: ffffc90004daf330 R08: ffff888073bdea5b R09: 1ffff1100e77bd4b
R10: dffffc0000000000 R11: ffffed100e77bd4c R12: dffffc0000000000
R13: 1ffff920009b5e3c R14: ffffffffffffff8b R15: 0000000000000001
FS:  00007f82d73b06c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 000000001f711000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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_add_nondir+0x93/0x270 fs/ext4/namei.c:2845
 ext4_create+0x2e6/0x470 fs/ext4/namei.c:2891
 lookup_open fs/namei.c:3490 [inline]
 open_last_lookups fs/namei.c:3558 [inline]
 path_openat+0x1181/0x2ee0 fs/namei.c:3788
 do_filp_open+0x1f1/0x430 fs/namei.c:3818
 do_sys_openat2+0x150/0x4b0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_creat fs/open.c:1414 [inline]
 __se_sys_creat fs/open.c:1408 [inline]
 __x64_sys_creat+0x8c/0xb0 fs/open.c:1408
 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: 0033:0x7f82d659c819
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:00007f82d73b0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f82d6815fa0 RCX: 00007f82d659c819
RDX: 0000000000000000 RSI: ecf86c37d53049cc RDI: 0000200000000280
RBP: 00007f82d6632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f82d6816038 R14: 00007f82d6815fa0 R15: 00007ffc1a3a29d8
 </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:ffffc90004daf060 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88805447e700 RCX: 0000000000080000
RDX: ffffc9001c901000 RSI: 000000000001af6d RDI: ffffffffffffff93
RBP: ffffc90004daf330 R08: ffff888073bdea5b R09: 1ffff1100e77bd4b
R10: dffffc0000000000 R11: ffffed100e77bd4c R12: dffffc0000000000
R13: 1ffff920009b5e3c R14: ffffffffffffff8b R15: 0000000000000001
FS:  00007f82d73b06c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 000000001f711000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
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