linux-kernel - [syzbot] general protection fault in xas_create

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Message-ID: <00000000000061fc5805dab9a5ef@google.com>
Date:   Mon, 21 Mar 2022 05:29:22 -0700
From:   syzbot <syzbot+0d2b0bf32ca5cfd09f2e@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] general protection fault in xas_create_range

Hello,

syzbot found the following issue on:

HEAD commit:    56e337f2cf13 Revert "gpio: Revert regression in sysfs-gpio..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=146069d9700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=70f75a89c7a0e6bc
dashboard link: https://syzkaller.appspot.com/bug?extid=0d2b0bf32ca5cfd09f2e
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0d2b0bf32ca5cfd09f2e@...kaller.appspotmail.com

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: 32 Comm: khugepaged Not tainted 5.17.0-rc8-syzkaller-00003-g56e337f2cf13 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:xa_parent_locked include/linux/xarray.h:1207 [inline]
RIP: 0010:xas_create_range+0x2d9/0x6e0 lib/xarray.c:725
Code: 89 ee 49 83 ed 40 49 c1 ee 03 4c 89 6d 08 4c 8d 6d 12 4d 01 e6 e9 93 00 00 00 e8 d2 0f 72 fd 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 fb 02 00 00 48 8b 04 24 4c 8b 7b 08 80 38 00
RSP: 0018:ffffc90001097a48 EFLAGS: 00010002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880139de240 RSI: ffffffff8405e5be RDI: 0000000000000008
RBP: ffffc90001097bb0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8405e679 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc90001097bc2 R14: fffff52000212f76 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe25571c98 CR3: 0000000079206000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 collapse_file+0x2d3/0x3c40 mm/khugepaged.c:1678
 khugepaged_scan_file mm/khugepaged.c:2073 [inline]
 khugepaged_scan_mm_slot mm/khugepaged.c:2168 [inline]
 khugepaged_do_scan mm/khugepaged.c:2252 [inline]
 khugepaged+0x53c7/0x6c00 mm/khugepaged.c:2297
 kthread+0x2e9/0x3a0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:xa_parent_locked include/linux/xarray.h:1207 [inline]
RIP: 0010:xas_create_range+0x2d9/0x6e0 lib/xarray.c:725
Code: 89 ee 49 83 ed 40 49 c1 ee 03 4c 89 6d 08 4c 8d 6d 12 4d 01 e6 e9 93 00 00 00 e8 d2 0f 72 fd 48 8d 7b 08 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 fb 02 00 00 48 8b 04 24 4c 8b 7b 08 80 38 00
RSP: 0018:ffffc90001097a48 EFLAGS: 00010002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8880139de240 RSI: ffffffff8405e5be RDI: 0000000000000008
RBP: ffffc90001097bb0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8405e679 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffc90001097bc2 R14: fffff52000212f76 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe25571c98 CR3: 0000000079206000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 ee                	mov    %ebp,%esi
   2:	49 83 ed 40          	sub    $0x40,%r13
   6:	49 c1 ee 03          	shr    $0x3,%r14
   a:	4c 89 6d 08          	mov    %r13,0x8(%rbp)
   e:	4c 8d 6d 12          	lea    0x12(%rbp),%r13
  12:	4d 01 e6             	add    %r12,%r14
  15:	e9 93 00 00 00       	jmpq   0xad
  1a:	e8 d2 0f 72 fd       	callq  0xfd720ff1
  1f:	48 8d 7b 08          	lea    0x8(%rbx),%rdi
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	0f 85 fb 02 00 00    	jne    0x330
  35:	48 8b 04 24          	mov    (%rsp),%rax
  39:	4c 8b 7b 08          	mov    0x8(%rbx),%r15
  3d:	80 38 00             	cmpb   $0x0,(%rax)


---
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