EXT4-fs (loop2): stripe (65535) is not aligned with cluster size (4096), stripe is disabled
EXT4-fs error (device loop2): ext4_read_block_bitmap_nowait:478: comm syz.2.327: Invalid block bitmap block 0 in block_group 0
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: 1 PID: 6969 Comm: syz.2.327 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+0x2d11/0x6800 fs/ext4/extents.c:4498
Code: 8b 7c 24 10 4d 85 ff 0f 84 bd 00 00 00 e8 b7 e0 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 08 4d 89 fc 49 8d
RSP: 0018:ffffc9000bbf6ca0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffffffffff8b RCX: 0000000000080000
RDX: ffffc9000d51b000 RSI: 0000000000037d54 RDI: ffffffffffffff93
RBP: ffffc9000bbf6f50 R08: ffffffff911c565f R09: 1ffffffff2238acb
R10: dffffc0000000000 R11: fffffbfff2238acc R12: 0000000000000001
R13: 1ffff9200177edc0 R14: dffffc0000000000 R15: ffffffffffffff8b
FS:  00007fc83d2866c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 000000005defe000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 ext4_map_blocks+0x9e2/0x1b80 fs/ext4/inode.c:654
 ext4_getblk+0x1d0/0x6f0 fs/ext4/inode.c:864
 ext4_bread+0x2a/0x170 fs/ext4/inode.c:920
 ext4_quota_write+0x23a/0x580 fs/ext4/super.c:7317
 write_blk+0x115/0x220 fs/quota/quota_tree.c:70
 do_insert_tree+0xad2/0x10a0 fs/quota/quota_tree.c:407
 do_insert_tree+0x9da/0x10a0 fs/quota/quota_tree.c:402
 dq_insert_tree fs/quota/quota_tree.c:432 [inline]
 qtree_write_dquot+0x4a1/0x5d0 fs/quota/quota_tree.c:451
 v2_write_dquot+0x10c/0x1a0 fs/quota/quota_v2.c:361
 dquot_acquire+0x320/0x610 fs/quota/dquot.c:474
 ext4_acquire_dquot+0x2e3/0x4b0 fs/ext4/super.c:6949
 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:5621 [inline]
 ext4_fill_super+0x5eea/0x67b0 fs/ext4/super.c:5744
 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: 0033:0x7fc83c39da8a
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:00007fc83d285e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc83d285ee0 RCX: 00007fc83c39da8a
RDX: 0000200000000300 RSI: 00002000000005c0 RDI: 00007fc83d285ea0
RBP: 0000200000000300 R08: 00007fc83d285ee0 R09: 0000000001818e58
R10: 0000000001818e58 R11: 0000000000000246 R12: 00002000000005c0
R13: 00007fc83d285ea0 R14: 000000000000063f R15: 00002000000003c0
 </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+0x2d11/0x6800 fs/ext4/extents.c:4498
Code: 8b 7c 24 10 4d 85 ff 0f 84 bd 00 00 00 e8 b7 e0 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 08 4d 89 fc 49 8d
RSP: 0018:ffffc9000bbf6ca0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffffffffff8b RCX: 0000000000080000
RDX: ffffc9000d51b000 RSI: 0000000000037d54 RDI: ffffffffffffff93
RBP: ffffc9000bbf6f50 R08: ffffffff911c565f R09: 1ffffffff2238acb
R10: dffffc0000000000 R11: fffffbfff2238acc R12: 0000000000000001
R13: 1ffff9200177edc0 R14: dffffc0000000000 R15: ffffffffffffff8b
FS:  00007fc83d2866c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffff93 CR3: 000000005defe000 CR4: 00000000003506e0
----------------
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 b7 e0 58 ff       	call   0xff58e0c9
  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 08       	mov    %rax,0x8(%rsp)
  3b:	4d 89 fc             	mov    %r15,%r12
  3e:	49                   	rex.WB
  3f:	8d                   	.byte 0x8d