linux-kernel - Re: [syzbot] linux-next test error: WARNING in vma

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Message-ID: <20230124154210.efkn6lakc4tj5p53@revolver>
Date:   Tue, 24 Jan 2023 10:42:10 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     syzbot <syzbot+1d9ec4d1a334ae9e1ca6@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-next@...r.kernel.org,
        sfr@...b.auug.org.au, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] linux-next test error: WARNING in vma_merge

* syzbot <syzbot+1d9ec4d1a334ae9e1ca6@...kaller.appspotmail.com> [230124 04:37]:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    a54df7622717 Add linux-next specific files for 20230124
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=13220341480000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=32f13cf65b56e95d
> dashboard link: https://syzkaller.appspot.com/bug?extid=1d9ec4d1a334ae9e1ca6
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/131be349f841/disk-a54df762.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/35330c9d8c6e/vmlinux-a54df762.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/90c182db9219/bzImage-a54df762.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+1d9ec4d1a334ae9e1ca6@...kaller.appspotmail.com

Thanks.

This indicates that the vma iterator is in the incorrect location for
the requested store operation.

I'm looking into this now.

> 
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 5076 at mm/internal.h:908 vma_iter_store mm/internal.h:908 [inline]
> WARNING: CPU: 1 PID: 5076 at mm/internal.h:908 vma_merge.cold+0x2e0/0x6b1 mm/mmap.c:1014
> Modules linked in:
> CPU: 0 PID: 5076 Comm: syz-fuzzer Not tainted 6.2.0-rc5-next-20230124-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
> RIP: 0010:vma_iter_store mm/internal.h:908 [inline]
> RIP: 0010:vma_merge.cold+0x2e0/0x6b1 mm/mmap.c:1014
> Code: 2a 48 c1 ea 03 80 3c 02 00 74 09 48 8b 3c 24 e8 7a 39 0f f8 48 8b 04 24 4c 8b 28 e9 e6 4a fe f7 48 89 74 24 48 e8 84 52 c1 f7 <0f> 0b 48 8b 54 24 28 48 c7 c7 a0 60 58 8a 48 8b 74 24 48 e8 e4 d5
> RSP: 0018:ffffc90003c5f980 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffffc90003c5fb60 RCX: 0000000000000000
> RDX: ffff88807ec23a80 RSI: ffffffff89c09b9c RDI: 0000000000000006
> RBP: 0000000000000000 R08: 0000000000000006 R09: 000000c000400000
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff888077f28d28
> R13: ffffc90003c5fb70 R14: ffff888077f28d20 R15: ffffc90003c5fa10
> FS:  0000000001f4dab0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000c0006f3000 CR3: 000000002af6e000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  madvise_update_vma+0x21b/0xa80 mm/madvise.c:153
>  madvise_vma_behavior+0x7ea/0x20a0 mm/madvise.c:1091
>  madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1260
>  do_madvise.part.0+0x18e/0x340 mm/madvise.c:1439
>  do_madvise mm/madvise.c:1452 [inline]
>  __do_sys_madvise mm/madvise.c:1452 [inline]
>  __se_sys_madvise mm/madvise.c:1450 [inline]
>  __x64_sys_madvise+0x117/0x150 mm/madvise.c:1450
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x4675b7
> Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14
> RSP: 002b:00007ffe658ce770 EFLAGS: 00000206 ORIG_RAX: 000000000000001c
> RAX: ffffffffffffffda RBX: 0000000000002000 RCX: 00000000004675b7
> RDX: 000000000000000f RSI: 0000000000200000 RDI: 000000c000600000
> RBP: 00007ffe658ce7b0 R08: 0000000000200000 R09: 0000000000000200
> R10: 0000000000000118 R11: 0000000000000206 R12: 00007f77fecbb000
> R13: 0000000000000080 R14: 0000000001f4d640 R15: 0000000000001018
>  </TASK>
> 
>