syzbot

ext4 filesystem being mounted at /0/file1 supports timestamps until 2038-01-19 (0x7fffffff)
EXT4-fs error (device loop2): ext4_do_update_inode:5270: inode #2: comm syz.2.17: corrupted inode contents
EXT4-fs error (device loop2): ext4_dirty_inode:6135: inode #2: comm syz.2.17: mark_inode_dirty error
EXT4-fs error (device loop2): ext4_do_update_inode:5270: inode #2: comm syz.2.17: corrupted inode contents
EXT4-fs error (device loop2): __ext4_ext_dirty:206: inode #2: comm syz.2.17: 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 7012067 P4D 7012067 PUD 7014067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 362 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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+0x2e59/0x6200 fs/ext4/extents.c:4497
Code: 40 01 00 00 4d 85 f6 0f 84 bc 00 00 00 48 89 5c 24 20 49 8d 7e 08 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 38 16 00 00 <41> 0f b7 46 08 c1 e0 04 48 8d 04 40 48 89 44 24 08 49 8d 46 28 48
RSP: 0018:ffffc90000777500 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88812e660000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffffffff93
RBP: ffffc900007777b0 R08: ffff88811143ded3 R09: 1ffff11022287bda
R10: dffffc0000000000 R11: ffffed1022287bdb R12: dffffc0000000000
R13: 1ffff920000eeecc R14: ffffffffffffff8b R15: 0000000000000001
FS:  000055556ffe7500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 000000012d8b3000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_map_blocks+0x9d8/0x1b70 fs/ext4/inode.c:679
 ext4_getblk+0x1cc/0x6e0 fs/ext4/inode.c:890
 ext4_bread+0x2b/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+0x39c/0x580 fs/namei.c:4113
 do_mkdirat+0x171/0x4c0 fs/namei.c:4138
 __do_sys_mkdirat fs/namei.c:4153 [inline]
 __se_sys_mkdirat fs/namei.c:4151 [inline]
 __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4151
 x64_sys_call+0x73d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259
 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: 0033:0x7ff4c4f9cdd9
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:00007ffddc0f4678 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ff4c5215fa0 RCX: 00007ff4c4f9cdd9
RDX: 0000000000000000 RSI: 0000200000000340 RDI: ffffffffffffff9c
RBP: 00007ff4c5032d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff4c5215fac R14: 00007ff4c5215fa0 R15: 00007ff4c5215fa0
 </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+0x2e59/0x6200 fs/ext4/extents.c:4497
Code: 40 01 00 00 4d 85 f6 0f 84 bc 00 00 00 48 89 5c 24 20 49 8d 7e 08 48 89 f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 38 16 00 00 <41> 0f b7 46 08 c1 e0 04 48 8d 04 40 48 89 44 24 08 49 8d 46 28 48
RSP: 0018:ffffc90000777500 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88812e660000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffffffff93
RBP: ffffc900007777b0 R08: ffff88811143ded3 R09: 1ffff11022287bda
R10: dffffc0000000000 R11: ffffed1022287bdb R12: dffffc0000000000
R13: 1ffff920000eeecc R14: ffffffffffffff8b R15: 0000000000000001
FS:  000055556ffe7500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 000000012d8b3000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	40 01 00             	rex add %eax,(%rax)
   3:	00 4d 85             	add    %cl,-0x7b(%rbp)
   6:	f6 0f 84             	testb  $0x84,(%rdi)
   9:	bc 00 00 00 48       	mov    $0x48000000,%esp
   e:	89 5c 24 20          	mov    %ebx,0x20(%rsp)
  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 38 16 00 00    	jne    0x1662
* 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 08       	mov    %rax,0x8(%rsp)
  3b:	49 8d 46 28          	lea    0x28(%r14),%rax
  3f:	48                   	rex.W