general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 5842 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:PageTail include/linux/page-flags.h:292 [inline]
RIP: 0010:folio_flags include/linux/page-flags.h:319 [inline]
RIP: 0010:folio_test_uptodate include/linux/page-flags.h:719 [inline]
RIP: 0010:ext4_mb_load_buddy_gfp+0x27a/0x1770 fs/ext4/mballoc.c:1536
Code: 00 00 e8 a9 c1 58 ff 41 bc 8b ff ff ff e9 96 05 00 00 48 89 c3 4c 8d 78 08 4d 89 fd 49 c1 ed 03 48 bd 00 00 00 00 00 fc ff df <41> 80 7c 2d 00 00 74 08 4c 89 ff e8 46 25 aa ff 4d 8b 3f 4c 89 fe
RSP: 0018:ffffc900052ef1b0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802cc11e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8f22416f R09: 1ffffffff1e4482d
R10: dffffc0000000000 R11: fffffbfff1e4482e R12: 0000000000000000
R13: 0000000000000001 R14: 1ffff11004dea2de R15: 0000000000000008
FS:  000055557682e500(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f70f69d95e0 CR3: 000000002b0a0000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 ext4_mb_load_buddy fs/ext4/mballoc.c:1641 [inline]
 ext4_mb_regular_allocator+0x1346/0x34a0 fs/ext4/mballoc.c:2798
 ext4_mb_new_blocks+0xcf1/0x44d0 fs/ext4/mballoc.c:5793
 ext4_ext_map_blocks+0x184a/0x6680 fs/ext4/extents.c:4369
 ext4_map_blocks+0x9d7/0x1a90 fs/ext4/inode.c:681
 ext4_getblk+0x1c5/0x720 fs/ext4/inode.c:892
 ext4_bread+0x26/0x170 fs/ext4/inode.c:948
 ext4_append+0x2bb/0x560 fs/ext4/namei.c:83
 ext4_init_new_dir+0x2b8/0x550 fs/ext4/namei.c:3032
 ext4_mkdir+0x4c3/0xc90 fs/ext4/namei.c:3078
 vfs_mkdir+0x386/0x570 fs/namei.c:4161
 do_mkdirat+0x1d8/0x440 fs/namei.c:4186
 __do_sys_mkdir fs/namei.c:4206 [inline]
 __se_sys_mkdir fs/namei.c:4204 [inline]
 __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4204
 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: 0033:0x7f70f69d95e7
Code: 94 c0 48 8b 54 24 48 64 48 2b 14 25 28 00 00 00 75 08 0f b6 c0 48 83 c4 58 c3 e8 e4 1f fd ff 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff7add2198 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fff7add22c2 RCX: 00007f70f69d95e7
RDX: 0000000006a90eb8 RSI: 00000000000001c0 RDI: 00007fff7add22b0
RBP: 8421084210842109 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000006a90eb8
R13: 00007fff7add22c2 R14: 0000000000000004 R15: 00007f70f6a5ebe0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:PageTail include/linux/page-flags.h:292 [inline]
RIP: 0010:folio_flags include/linux/page-flags.h:319 [inline]
RIP: 0010:folio_test_uptodate include/linux/page-flags.h:719 [inline]
RIP: 0010:ext4_mb_load_buddy_gfp+0x27a/0x1770 fs/ext4/mballoc.c:1536
Code: 00 00 e8 a9 c1 58 ff 41 bc 8b ff ff ff e9 96 05 00 00 48 89 c3 4c 8d 78 08 4d 89 fd 49 c1 ed 03 48 bd 00 00 00 00 00 fc ff df <41> 80 7c 2d 00 00 74 08 4c 89 ff e8 46 25 aa ff 4d 8b 3f 4c 89 fe
RSP: 0018:ffffc900052ef1b0 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802cc11e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8f22416f R09: 1ffffffff1e4482d
R10: dffffc0000000000 R11: fffffbfff1e4482e R12: 0000000000000000
R13: 0000000000000001 R14: 1ffff11004dea2de R15: 0000000000000008
FS:  000055557682e500(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8252b9c000 CR3: 000000002b0a0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	e8 a9 c1 58 ff       	call   0xff58c1b0
   7:	41 bc 8b ff ff ff    	mov    $0xffffff8b,%r12d
   d:	e9 96 05 00 00       	jmp    0x5a8
  12:	48 89 c3             	mov    %rax,%rbx
  15:	4c 8d 78 08          	lea    0x8(%rax),%r15
  19:	4d 89 fd             	mov    %r15,%r13
  1c:	49 c1 ed 03          	shr    $0x3,%r13
  20:	48 bd 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbp
  27:	fc ff df
* 2a:	41 80 7c 2d 00 00    	cmpb   $0x0,0x0(%r13,%rbp,1) <-- trapping instruction
  30:	74 08                	je     0x3a
  32:	4c 89 ff             	mov    %r15,%rdi
  35:	e8 46 25 aa ff       	call   0xffaa2580
  3a:	4d 8b 3f             	mov    (%r15),%r15
  3d:	4c 89 fe             	mov    %r15,%rsi