MIME-Version: 1.0
Date:   Wed, 29 Dec 2021 17:54:21 -0800
Message-ID: <00000000000049f33f05d4535526@google.com>
Subject: [syzbot] general protection fault in mod_memcg_page_state
From:   syzbot <syzbot+864849a13d44b22de04d@syzkaller.appspotmail.com>
To:     andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
        changbin.du@intel.com, daniel@iogearbox.net, davem@davemloft.net,
        edumazet@google.com, hawk@kernel.org, hkallweit1@gmail.com,
        john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org,
        kuba@kernel.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, songliubraving@fb.com,
        syzkaller-bugs@googlegroups.com, yajun.deng@linux.dev, yhs@fb.com
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Hello,

syzbot found the following issue on:

HEAD commit:    ea586a076e8a Add linux-next specific files for 20211224
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16dc61edb00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a9c4e3dde2c568fb
dashboard link: https://syzkaller.appspot.com/bug?extid=864849a13d44b22de04d
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17371b99b00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14519ac3b00000

The issue was bisected to:

commit e4b8954074f6d0db01c8c97d338a67f9389c042f
Author: Eric Dumazet <edumazet@google.com>
Date:   Tue Dec 7 01:30:37 2021 +0000

    netlink: add net device refcount tracker to struct ethnl_req_info

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14f00ddbb00000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=16f00ddbb00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12f00ddbb00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+864849a13d44b22de04d@syzkaller.appspotmail.com
Fixes: e4b8954074f6 ("netlink: add net device refcount tracker to struct ethnl_req_info")

general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 3677 Comm: syz-executor257 Not tainted 5.16.0-rc6-next-20211224-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:_compound_head include/linux/page-flags.h:263 [inline]
RIP: 0010:page_memcg include/linux/memcontrol.h:452 [inline]
RIP: 0010:mod_memcg_page_state.part.0.constprop.0+0x28/0x5b0 include/linux/memcontrol.h:957
Code: 00 90 41 56 41 55 41 54 41 89 f4 55 48 89 fd 53 4c 8d 6d 08 e8 49 dd c1 ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 11 05 00 00 4c 8b 75 08 31 ff 4c 89 f3 83 e3 01
RSP: 0018:ffffc900028bf5c0 EFLAGS: 00010202

RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff81b62737 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81b745c0 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000008 R14: ffff88807ee9b628 R15: ffff88807ee9b600
FS:  00007f8d769be700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe642c4960 CR3: 000000006fc65000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 mod_memcg_page_state mm/vmalloc.c:2971 [inline]
 __vmalloc_area_node mm/vmalloc.c:2971 [inline]
 __vmalloc_node_range+0x678/0xf80 mm/vmalloc.c:3106
 __vmalloc_node mm/vmalloc.c:3156 [inline]
 vmalloc+0x67/0x80 mm/vmalloc.c:3197
 bpf_prog_calc_tag+0xc9/0x6c0 kernel/bpf/core.c:279
 resolve_pseudo_ldimm64 kernel/bpf/verifier.c:11925 [inline]
 bpf_check+0x1c86/0xbac0 kernel/bpf/verifier.c:14279
 bpf_prog_load+0xf55/0x21f0 kernel/bpf/syscall.c:2344
 __sys_bpf+0x68a/0x5970 kernel/bpf/syscall.c:4634
 __do_sys_bpf kernel/bpf/syscall.c:4738 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:4736 [inline]
 __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4736
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f8d76a0cd09
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8d769be2f8 EFLAGS: 00000246
 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f8d76a954a8 RCX: 00007f8d76a0cd09
RDX: 0000000000000080 RSI: 0000000020000200 RDI: 0000000000000005
RBP: 00007f8d76a954a0 R08: 0000000000000002 R09: 0000000000003032
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f8d769be300 R14: 00007f8d769be400 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_compound_head include/linux/page-flags.h:263 [inline]
RIP: 0010:page_memcg include/linux/memcontrol.h:452 [inline]
RIP: 0010:mod_memcg_page_state.part.0.constprop.0+0x28/0x5b0 include/linux/memcontrol.h:957
Code: 00 90 41 56 41 55 41 54 41 89 f4 55 48 89 fd 53 4c 8d 6d 08 e8 49 dd c1 ff 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 11 05 00 00 4c 8b 75 08 31 ff 4c 89 f3 83 e3 01
RSP: 0018:ffffc900028bf5c0 EFLAGS: 00010202

RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff81b62737 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81b745c0 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000008 R14: ffff88807ee9b628 R15: ffff88807ee9b600
FS:  00007f8d769be700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d76a76e84 CR3: 000000006fc65000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 90 41 56 41 55    	add    %dl,0x55415641(%rax)
   6:	41 54                	push   %r12
   8:	41 89 f4             	mov    %esi,%r12d
   b:	55                   	push   %rbp
   c:	48 89 fd             	mov    %rdi,%rbp
   f:	53                   	push   %rbx
  10:	4c 8d 6d 08          	lea    0x8(%rbp),%r13
  14:	e8 49 dd c1 ff       	callq  0xffc1dd62
  19:	4c 89 ea             	mov    %r13,%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 11 05 00 00    	jne    0x545
  34:	4c 8b 75 08          	mov    0x8(%rbp),%r14
  38:	31 ff                	xor    %edi,%edi
  3a:	4c 89 f3             	mov    %r14,%rbx
  3d:	83 e3 01             	and    $0x1,%ebx


---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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https://goo.gl/tpsmEJ#testing-patches