EXT4-fs error (device loop0): ext4_map_blocks:608: inode #3: block 2: comm syz.0.690: lblock 2 mapped to illegal pblock 2 (length 1)
Quota error (device loop0): qtree_write_dquot: dquota write failed
EXT4-fs error (device loop0): __ext4_get_inode_loc:4489: comm syz.0.690: Invalid inode table block 1 in block_group 0
EXT4-fs error (device loop0) in ext4_reserve_inode_write:5920: Corrupt filesystem
EXT4-fs error (device loop0): __ext4_ext_dirty:206: inode #3: comm syz.0.690: 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 cf35067 P4D cf35067 PUD cf37067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 7518 Comm: syz.0.690 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+0x2d00/0x6800 fs/ext4/extents.c:4494
Code: 8b 7c 24 10 4d 85 ff 0f 84 bd 00 00 00 e8 78 dc 58 ff 49 8d 7f 08 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 3d 1e 00 00 <41> 0f b7 47 08 c1 e0 04 48 8d 04 40 48 89 44 24 10 4d 89 fc 49 8d
RSP: 0018:ffffc9000d0b6ee0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000d169000 RSI: 000000000007ffff RDI: ffffffffffffff93
RBP: ffffc9000d0b7190 R08: ffffffff8e8b02af R09: 1ffffffff1d16055
R10: dffffc0000000000 R11: fffffbfff1d16056 R12: 0000000000000001
R13: 1ffff92001a16e08 R14: dffffc0000000000 R15: ffffffffffffff8b
FS:  00007fb3a47366c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 0000000077a5e000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 ext4_map_blocks+0x9e2/0x1b80 fs/ext4/inode.c:652
 ext4_getblk+0x1d0/0x6f0 fs/ext4/inode.c:862
 ext4_bread+0x2a/0x170 fs/ext4/inode.c:918
 ext4_quota_write+0x23a/0x580 fs/ext4/super.c:7313
 v2_write_file_info+0x24d/0x3b0 fs/quota/quota_v2.c:213
 dquot_acquire+0x477/0x610 fs/quota/dquot.c:477
 ext4_acquire_dquot+0x2e3/0x4b0 fs/ext4/super.c:6945
 dqget+0x77c/0xeb0 fs/quota/dquot.c:990
 __dquot_initialize+0x3c7/0xcd0 fs/quota/dquot.c:1518
 ext4_process_orphan+0x54/0x300 fs/ext4/orphan.c:327
 ext4_orphan_cleanup+0xbec/0x1420 fs/ext4/orphan.c:472
 __ext4_fill_super fs/ext4/super.c:5617 [inline]
 ext4_fill_super+0x5ed0/0x6790 fs/ext4/super.c:5740
 get_tree_bdev+0x3f3/0x520 fs/super.c:1591
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fb3a379da0a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 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:00007fb3a4735e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb3a4735ee0 RCX: 00007fb3a379da0a
RDX: 0000200000000140 RSI: 0000200000000040 RDI: 00007fb3a4735ea0
RBP: 0000200000000140 R08: 00007fb3a4735ee0 R09: 0000000000008000
R10: 0000000000008000 R11: 0000000000000246 R12: 0000200000000040
R13: 00007fb3a4735ea0 R14: 0000000000000605 R15: 0000200000000800
 </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+0x2d00/0x6800 fs/ext4/extents.c:4494
Code: 8b 7c 24 10 4d 85 ff 0f 84 bd 00 00 00 e8 78 dc 58 ff 49 8d 7f 08 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 3d 1e 00 00 <41> 0f b7 47 08 c1 e0 04 48 8d 04 40 48 89 44 24 10 4d 89 fc 49 8d
RSP: 0018:ffffc9000d0b6ee0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000d169000 RSI: 000000000007ffff RDI: ffffffffffffff93
RBP: ffffc9000d0b7190 R08: ffffffff8e8b02af R09: 1ffffffff1d16055
R10: dffffc0000000000 R11: fffffbfff1d16056 R12: 0000000000000001
R13: 1ffff92001a16e08 R14: dffffc0000000000 R15: ffffffffffffff8b
FS:  00007fb3a47366c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 0000000077a5e000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	8b 7c 24 10          	mov    0x10(%rsp),%edi
   4:	4d 85 ff             	test   %r15,%r15
   7:	0f 84 bd 00 00 00    	je     0xca
   d:	e8 78 dc 58 ff       	call   0xff58dc8a
  12:	49 8d 7f 08          	lea    0x8(%r15),%rdi
  16:	48 89 f8             	mov    %rdi,%rax
  19:	48 c1 e8 03          	shr    $0x3,%rax
  1d:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax
  22:	84 c0                	test   %al,%al
  24:	0f 85 3d 1e 00 00    	jne    0x1e67
* 2a:	41 0f b7 47 08       	movzwl 0x8(%r15),%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 10       	mov    %rax,0x10(%rsp)
  3b:	4d 89 fc             	mov    %r15,%r12
  3e:	49                   	rex.WB
  3f:	8d                   	.byte 0x8d