Message-ID: <68a7ef21.050a0220.37038e.004e.GAE@google.com>
Date: Thu, 21 Aug 2025 21:16:33 -0700
From: syzbot <syzbot+127bd32548258909963d@...kaller.appspotmail.com>
To: almaz.alexandrovich@...agon-software.com, axboe@...nel.dk, 
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	ntfs3@...ts.linux.dev, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [block?] [ntfs3?] general protection fault in blk_mq_issue_direct

Hello,

syzbot found the following issue on:

HEAD commit:    be48bcf004f9 Merge tag 'for-6.17-rc2-tag' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15995ba2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e9f694461848a008
dashboard link: https://syzkaller.appspot.com/bug?extid=127bd32548258909963d
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1439c6f0580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c7f60d7b6589/disk-be48bcf0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3fe093258314/vmlinux-be48bcf0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/493b5928449f/bzImage-be48bcf0.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/dd51753d0efa/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+127bd32548258909963d@...kaller.appspotmail.com

overlayfs: upper fs does not support tmpfile.
overlayfs: upper fs does not support RENAME_WHITEOUT.
Oops: general protection fault, probably for non-canonical address 0xdffffc0020000008: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x0000000100000040-0x0000000100000047]
CPU: 0 UID: 0 PID: 6460 Comm: syz.3.167 Tainted: G        W           6.17.0-rc2-syzkaller-00028-gbe48bcf004f9 #0 PREEMPT_{RT,(full)} 
CPU: 0 UID: 0 PID: 6460 Comm: syz.3.167 Tainted: G        W           6.17.0-rc2-syzkaller-00028-gbe48bcf004f9 #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rq_list_pop include/linux/blk-mq.h:267 [inline]
RIP: 0010:blk_mq_issue_direct+0x7b/0x660 block/blk-mq.c:2792
Code: c1 e8 03 48 89 44 24 30 c7 44 24 04 00 00 00 00 4c 89 64 24 20 4c 89 6c 24 18 49 8d 5e 48 48 89 d8 48 c1 e8 03 48 89 44 24 28 <42> 80 3c 38 00 74 08 48 89 df e8 a6 58 82 fd 48 89 5c 24 10 48 8b
RSP: 0018:ffffc9000559e1d8 EFLAGS: 00010203
RAX: 0000000020000008 RBX: 0000000100000047 RCX: ffff88802fa88000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888024920000 R08: ffff88802fa88000 R09: 0000000000000003
R10: 0000000000000100 R11: 000000000000000d R12: ffffc9000559e500
R13: 1ffff92000ab3ca0 R14: 00000000ffffffff R15: dffffc0000000000
FS:  00007fd977a9e6c0(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9e1ca45000 CR3: 000000003189a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 blk_mq_dispatch_queue_requests+0x6fe/0x800 block/blk-mq.c:2878
 blk_mq_flush_plug_list+0x432/0x550 block/blk-mq.c:2961
 __blk_flush_plug+0x3d3/0x4b0 block/blk-core.c:1220
 blk_finish_plug block/blk-core.c:1247 [inline]
 __submit_bio+0x2d3/0x5a0 block/blk-core.c:649
 __submit_bio_noacct_mq block/blk-core.c:722 [inline]
 submit_bio_noacct_nocheck+0x4f2/0xbb0 block/blk-core.c:751
 submit_bh fs/buffer.c:2829 [inline]
 __sync_dirty_buffer+0x22e/0x370 fs/buffer.c:2867
 ntfs_write_bh+0x58b/0x740 fs/ntfs3/fsntfs.c:1461
 mi_write+0x84/0x1b0 fs/ntfs3/record.c:402
 indx_update_dup+0x584/0x730 fs/ntfs3/index.c:2705
 ni_update_parent+0x9e7/0xdd0 fs/ntfs3/frecord.c:3182
 ni_write_inode+0x944/0xfb0 fs/ntfs3/frecord.c:3277
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x6f4/0x1000 fs/fs-writeback.c:1745
 writeback_single_inode+0x1d5/0x640 fs/fs-writeback.c:1801
 sync_inode_metadata+0xb9/0x110 fs/fs-writeback.c:2883
 __generic_file_fsync+0x142/0x1b0 fs/libfs.c:1550
 generic_file_fsync+0x6f/0xf0 fs/libfs.c:1580
 ovl_sync_file+0x3a/0x50 fs/overlayfs/copy_up.c:254
 ovl_copy_up_metadata+0x831/0xb60 fs/overlayfs/copy_up.c:725
 ovl_copy_up_workdir fs/overlayfs/copy_up.c:821 [inline]
 ovl_do_copy_up fs/overlayfs/copy_up.c:1001 [inline]
 ovl_copy_up_one fs/overlayfs/copy_up.c:1202 [inline]
 ovl_copy_up_flags+0x160c/0x2fe0 fs/overlayfs/copy_up.c:1257
 ovl_open+0x13e/0x2f0 fs/overlayfs/file.c:211
 do_dentry_open+0x9ae/0x1350 fs/open.c:965
 vfs_open+0x3b/0x350 fs/open.c:1095
 do_open fs/namei.c:3887 [inline]
 path_openat+0x2ef1/0x3840 fs/namei.c:4046
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1461
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd97842ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd977a9e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fd978655fa0 RCX: 00007fd97842ebe9
RDX: 00000000000c4042 RSI: 0000200000000300 RDI: ffffffffffffff9c
RBP: 00007fd9784b1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001ff R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd978656038 R14: 00007fd978655fa0 R15: 00007ffe14b13fa8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:rq_list_pop include/linux/blk-mq.h:267 [inline]
RIP: 0010:blk_mq_issue_direct+0x7b/0x660 block/blk-mq.c:2792
Code: c1 e8 03 48 89 44 24 30 c7 44 24 04 00 00 00 00 4c 89 64 24 20 4c 89 6c 24 18 49 8d 5e 48 48 89 d8 48 c1 e8 03 48 89 44 24 28 <42> 80 3c 38 00 74 08 48 89 df e8 a6 58 82 fd 48 89 5c 24 10 48 8b
RSP: 0018:ffffc9000559e1d8 EFLAGS: 00010203
RAX: 0000000020000008 RBX: 0000000100000047 RCX: ffff88802fa88000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888024920000 R08: ffff88802fa88000 R09: 0000000000000003
R10: 0000000000000100 R11: 000000000000000d R12: ffffc9000559e500
R13: 1ffff92000ab3ca0 R14: 00000000ffffffff R15: dffffc0000000000
FS:  00007fd977a9e6c0(0000) GS:ffff8881269c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9e1ca47000 CR3: 000000003189a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	c1 e8 03             	shr    $0x3,%eax
   3:	48 89 44 24 30       	mov    %rax,0x30(%rsp)
   8:	c7 44 24 04 00 00 00 	movl   $0x0,0x4(%rsp)
   f:	00
  10:	4c 89 64 24 20       	mov    %r12,0x20(%rsp)
  15:	4c 89 6c 24 18       	mov    %r13,0x18(%rsp)
  1a:	49 8d 5e 48          	lea    0x48(%r14),%rbx
  1e:	48 89 d8             	mov    %rbx,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	48 89 44 24 28       	mov    %rax,0x28(%rsp)
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 a6 58 82 fd       	call   0xfd8258df
  39:	48 89 5c 24 10       	mov    %rbx,0x10(%rsp)
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b


---
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