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Thu, 26 Jan 2023 19:00:54 +0000 From: Sanan Hasanov To: Matthew Wilcox CC: "akpm@linux-foundation.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "contact@pgazz.com" , "syzkaller@googlegroups.com" , Huang Ying , David Hildenbrand Subject: Re: kernel BUG in page_add_anon_rmap Thread-Topic: kernel BUG in page_add_anon_rmap Thread-Index: AQHZMRe6C5MT4qQat0SXa+dBKYuLJq6xDdEAgAAAuPU= Date: Thu, 26 Jan 2023 19:00:53 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-traffictypediagnostic: IA1PR07MB9830:EE_|BYAPR07MB6008:EE_ x-ms-office365-filtering-correlation-id: ea5eb222-667a-409b-063c-08daffcfa64c x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:IA1PR07MB9830.namprd07.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230025)(4636009)(376002)(346002)(396003)(366004)(39860400002)(136003)(451199018)(64756008)(786003)(316002)(54906003)(166002)(38100700002)(122000001)(41300700001)(41320700001)(8676002)(76116006)(66476007)(66556008)(6916009)(66946007)(5660300002)(86362001)(38070700005)(8936002)(4326008)(44832011)(52536014)(55016003)(2906002)(6506007)(53546011)(75432002)(66446008)(33656002)(9686003)(26005)(186003)(966005)(478600001)(7696005)(45080400002)(83380400001)(71200400001);DIR:OUT;SFP:1101; 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable That=92s the whole report and there were no lines above =93cut here=94. I will try to do a bisect. Get Outlook for iOS ________________________________ From: Matthew Wilcox Sent: Thursday, January 26, 2023 1:57:14 PM To: Sanan Hasanov Cc: akpm@linux-foundation.org ; linux-mm@kvack.o= rg ; linux-kernel@vger.kernel.org ; contact@pgazz.com ; syzkaller@googlegroups.co= m ; Huang Ying ; David Hi= ldenbrand Subject: Re: kernel BUG in page_add_anon_rmap On Wed, Jan 25, 2023 at 11:59:16PM +0000, Sanan Hasanov wrote: > Good day, dear maintainers, > > We found a bug using a modified kernel configuration file used by syzbot. > > We enhanced the coverage of the configuration file using our tool, klocal= izer. > > Kernel Branch: 6.2.0-rc5-next-20230124 > Kernel config: https://nam02.safelinks.protection.outlook.com/?url=3Dhttp= s%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1MZSgIF4R9QfikEuF5siUIZVPce-GiJQK%2= Fview%3Fusp%3Dsharing&data=3D05%7C01%7Csanan.hasanov%40knights.ucf.edu%7C8d= bf3496ddfb4c8e166508daffcf26a6%7C5b16e18278b3412c919668342689eeb7%7C0%7C0%7= C638103562427653210%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2l= uMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3D%2FaWKd2fZ8NTjD= kRDMEwU5iaf0OMlSiCHM19V24VwT6g%3D&reserved=3D0 > Reproducer: https://nam02.safelinks.protection.outlook.com/?url=3Dhttps%3= A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1H5KWkT9VVMWTUVVgIaZi6J-fmukRx-BM%2Fvi= ew%3Fusp%3Dsharing&data=3D05%7C01%7Csanan.hasanov%40knights.ucf.edu%7C8dbf3= 496ddfb4c8e166508daffcf26a6%7C5b16e18278b3412c919668342689eeb7%7C0%7C0%7C63= 8103562427653210%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMz= IiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3D3x4OCCA0GLD3pyZSJr= cj55YNEpLvsTmQPLLLNLGY97A%3D&reserved=3D0 > > Thank you! > > Best regards, > Sanan Hasanov > > head: 0000000000020000 0000000000000000 00000004ffffffff ffff8881002b8000 > page dumped because: VM_BUG_ON_PAGE(!first && (flags & (( rmap_t)((((1UL)= )) << (0))))) > ------------[ cut here ]------------ I know it says "cut here" and you did that, but including just a few lines above that would be so much more helpful. I can infer that this is a multi-page folio, but more than that is hard to tell. > kernel BUG at mm/rmap.c:1248! That tracks with VM_BUG_ON_PAGE(!first && (flags & RMAP_EXCLUSIVE), page); > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > CPU: 7 PID: 14932 Comm: syz-executor.1 Not tainted 6.2.0-rc5-next-2023012= 4 #1 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/0= 1/2014 > RIP: 0010:page_add_anon_rmap+0xddd/0x11c0 mm/rmap.c:1248 > Code: c0 ff 48 8b 34 24 48 89 df e8 1f ff 07 00 49 89 c6 e9 85 f6 ff ff e= 8 52 73 c0 ff 48 c7 c6 c0 3c d8 89 48 89 ef e8 b3 23 f8 ff <0f> 0b e8 3c 73= c0 ff 48 c7 c6 00 3b d8 89 48 89 ef e8 9d 23 f8 ff > RSP: 0018:ffffc9000c56f7b0 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff88807efc6f30 RCX: 0000000000000000 > RDX: ffff8880464fd7c0 RSI: ffffffff81be733d RDI: fffff520018adedb > RBP: ffffea0000c68080 R08: 0000000000000056 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0000c68000 > R13: 0000000000000001 R14: ffffea0000c68088 R15: 0000000000000000 > FS: 00007f717898a700(0000) GS:ffff888119f80000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f7178947d78 CR3: 000000004a9e6000 CR4: 0000000000350ee0 > Call Trace: > > remove_migration_pte+0xaa6/0x1390 mm/migrate.c:261 if (folio_test_anon(folio)) page_add_anon_rmap(new, vma, pvmw.address, rmap_flags); Earlier in that function, we had: if (folio_test_anon(folio) && !is_readable_migration_entry(= entry)) rmap_flags |=3D RMAP_EXCLUSIVE; so that also makes sense. We can also infer that RMAP_COMPOUND wasn't set, so we're trying to do just one page from the folio. All right, back to rmap.c: first =3D atomic_inc_and_test(&page->_mapcount); So first is clearly false (ie _mapcount was not -1), implying somebody else already mapped this page. Not really sure what's going on at this point. Seems unlikely that the folio changes in remove_migration_pte() are responsible since they're from last January. Huang has some more changes to migrate.c that I don't feel qualified to judge. Nothing's jumping out at me as obviously wrong. Is it possible to do a bisect? > rmap_walk_anon+0x23a/0x5b0 mm/rmap.c:2433 > rmap_walk+0x96/0xd0 mm/rmap.c:2509 > remove_migration_ptes mm/migrate.c:294 [inline] > migrate_folio_move mm/migrate.c:1307 [inline] > migrate_pages_batch+0x15f8/0x3910 mm/migrate.c:1809 > migrate_pages+0x1b56/0x22e0 mm/migrate.c:1961 > do_mbind mm/mempolicy.c:1329 [inline] > kernel_mbind+0x4c0/0x790 mm/mempolicy.c:1476 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0x80 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7f717788edcd > Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f= 7 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:00007f7178989bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed > RAX: ffffffffffffffda RBX: 00007f71779bc050 RCX: 00007f717788edcd > RDX: 0000000000000004 RSI: 0000000000001000 RDI: 0000000020002000 > RBP: 00007f71778fc59c R08: 00000000000007ff R09: 0000000000000002 > R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007ffd2c012f6f R14: 00007ffd2c013110 R15: 00007f7178989d80 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:page_add_anon_rmap+0xddd/0x11c0 mm/rmap.c:1248 > Code: c0 ff 48 8b 34 24 48 89 df e8 1f ff 07 00 49 89 c6 e9 85 f6 ff ff e= 8 52 73 c0 ff 48 c7 c6 c0 3c d8 89 48 89 ef e8 b3 23 f8 ff <0f> 0b e8 3c 73= c0 ff 48 c7 c6 00 3b d8 89 48 89 ef e8 9d 23 f8 ff > RSP: 0018:ffffc9000c56f7b0 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: ffff88807efc6f30 RCX: 0000000000000000 > RDX: ffff8880464fd7c0 RSI: ffffffff81be733d RDI: fffff520018adedb > RBP: ffffea0000c68080 R08: 0000000000000056 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0000c68000 > R13: 0000000000000001 R14: ffffea0000c68088 R15: 0000000000000000 > FS: 00007f717898a700(0000) GS:ffff888119f80000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f7178947d78 CR3: 000000004a9e6000 CR4: 0000000000350ee0 > --_000_IA1PR07MB9830687500C25B4253EC4EB9ABCF9IA1PR07MB9830namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
That=92s the whole report and there were no lines above =93cut here=94= .
I will try to do a bisect.
From: Matthew Wilcox <wi= lly@infradead.org>
Sent: Thursday, January 26, 2023 1:57:14 PM
To: Sanan Hasanov <sanan.hasanov@Knights.ucf.edu>
Cc: akpm@linux-foundation.org <akpm@linux-foundation.org>; lin= ux-mm@kvack.org <linux-mm@kvack.org>; linux-kernel@vger.kernel.org &l= t;linux-kernel@vger.kernel.org>; contact@pgazz.com <contact@pgazz.com= >; syzkaller@googlegroups.com <syzkaller@googlegroups.com>; Huang Ying <ying.huang@intel.com>; David Hildenbrand <david@redha= t.com>
Subject: Re: kernel BUG in page_add_anon_rmap
 
On Wed, Jan 25, 2023 at 11:59:16PM +0000, Sanan Ha= sanov wrote:
> Good day, dear maintainers,
>
> We found a bug using a modified kernel configuration file used by syzb= ot.
>
> We enhanced the coverage of the configuration file using our tool, klo= calizer.
>
> Kernel Branch: 6.2.0-rc5-next-20230124
> Kernel config: https://nam02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fd= rive.google.com%2Ffile%2Fd%2F1MZSgIF4R9QfikEuF5siUIZVPce-GiJQK%2Fview%3Fusp= %3Dsharing&data=3D05%7C01%7Csanan.hasanov%40knights.ucf.edu%7C8dbf3496d= dfb4c8e166508daffcf26a6%7C5b16e18278b3412c919668342689eeb7%7C0%7C0%7C638103= 562427653210%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLC= JBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3D%2FaWKd2fZ8NTjDkRD= MEwU5iaf0OMlSiCHM19V24VwT6g%3D&reserved=3D0
> Reproducer: h= ttps://nam02.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fdrive.go= ogle.com%2Ffile%2Fd%2F1H5KWkT9VVMWTUVVgIaZi6J-fmukRx-BM%2Fview%3Fusp%3Dshar= ing&data=3D05%7C01%7Csanan.hasanov%40knights.ucf.edu%7C8dbf3496ddfb4c8e= 166508daffcf26a6%7C5b16e18278b3412c919668342689eeb7%7C0%7C0%7C6381035624276= 53210%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I= k1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3D3x4OCCA0GLD3pyZSJrcj55YNE= pLvsTmQPLLLNLGY97A%3D&reserved=3D0
>
> Thank you!
>
> Best regards,
> Sanan Hasanov
>
> head: 0000000000020000 0000000000000000 00000004ffffffff ffff8881002b8= 000
> page dumped because: VM_BUG_ON_PAGE(!first && (flags & (( = rmap_t)((((1UL))) << (0)))))
> ------------[ cut here ]------------

I know it says "cut here" and you did that, but including just a = few
lines above that would be so much more helpful.  I can infer that this=
is a multi-page folio, but more than that is hard to tell.

> kernel BUG at mm/rmap.c:1248!

That tracks with VM_BUG_ON_PAGE(!first && (flags & RMAP_EXCLUSI= VE), page);

> invalid opcode: 0000 [#1] PREEMPT SMP KASAN
> CPU: 7 PID: 14932 Comm: syz-executor.1 Not tainted 6.2.0-rc5-next-2023= 0124 #1
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 0= 4/01/2014
> RIP: 0010:page_add_anon_rmap+0xddd/0x11c0 mm/rmap.c:1248
> Code: c0 ff 48 8b 34 24 48 89 df e8 1f ff 07 00 49 89 c6 e9 85 f6 ff f= f e8 52 73 c0 ff 48 c7 c6 c0 3c d8 89 48 89 ef e8 b3 23 f8 ff <0f> 0b= e8 3c 73 c0 ff 48 c7 c6 00 3b d8 89 48 89 ef e8 9d 23 f8 ff
> RSP: 0018:ffffc9000c56f7b0 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffff88807efc6f30 RCX: 0000000000000000
> RDX: ffff8880464fd7c0 RSI: ffffffff81be733d RDI: fffff520018adedb
> RBP: ffffea0000c68080 R08: 0000000000000056 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0000c68000
> R13: 0000000000000001 R14: ffffea0000c68088 R15: 0000000000000000
> FS:  00007f717898a700(0000) GS:ffff888119f80000(0000) knlGS:00000= 00000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f7178947d78 CR3: 000000004a9e6000 CR4: 0000000000350ee0
> Call Trace:
>  <TASK>
>  remove_migration_pte+0xaa6/0x1390 mm/migrate.c:261

            &nb= sp;           if (folio_t= est_anon(folio))
            &nb= sp;            =        page_add_anon_rmap(new, vma, pvmw.addr= ess,
            &nb= sp;            =             &nb= sp;            = rmap_flags);

Earlier in that function, we had:
            &nb= sp;   if (folio_test_anon(folio) && !is_readable_migratio= n_entry(entry))
            &nb= sp;           rmap_flags = |=3D RMAP_EXCLUSIVE;

so that also makes sense.  We can also infer that RMAP_COMPOUND wasn't=
set, so we're trying to do just one page from the folio.

All right, back to rmap.c:

            &nb= sp;   first =3D atomic_inc_and_test(&page->_mapcount);

So first is clearly false (ie _mapcount was not -1), implying somebody
else already mapped this page.  Not really sure what's going on at
this point.  Seems unlikely that the folio changes in
remove_migration_pte() are responsible since they're from last January.
Huang has some more changes to migrate.c that I don't feel qualified
to judge.

Nothing's jumping out at me as obviously wrong.  Is it possible to
do a bisect?

>  rmap_walk_anon+0x23a/0x5b0 mm/rmap.c:2433
>  rmap_walk+0x96/0xd0 mm/rmap.c:2509
>  remove_migration_ptes mm/migrate.c:294 [inline]
>  migrate_folio_move mm/migrate.c:1307 [inline]
>  migrate_pages_batch+0x15f8/0x3910 mm/migrate.c:1809
>  migrate_pages+0x1b56/0x22e0 mm/migrate.c:1961
>  do_mbind mm/mempolicy.c:1329 [inline]
>  kernel_mbind+0x4c0/0x790 mm/mempolicy.c:1476
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x39/0x80 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> RIP: 0033:0x7f717788edcd
> Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 8= 9 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:00007f7178989bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed=
> RAX: ffffffffffffffda RBX: 00007f71779bc050 RCX: 00007f717788edcd
> RDX: 0000000000000004 RSI: 0000000000001000 RDI: 0000000020002000
> RBP: 00007f71778fc59c R08: 00000000000007ff R09: 0000000000000002
> R10: 00000000200000c0 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007ffd2c012f6f R14: 00007ffd2c013110 R15: 00007f7178989d80
>  </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:page_add_anon_rmap+0xddd/0x11c0 mm/rmap.c:1248
> Code: c0 ff 48 8b 34 24 48 89 df e8 1f ff 07 00 49 89 c6 e9 85 f6 ff f= f e8 52 73 c0 ff 48 c7 c6 c0 3c d8 89 48 89 ef e8 b3 23 f8 ff <0f> 0b= e8 3c 73 c0 ff 48 c7 c6 00 3b d8 89 48 89 ef e8 9d 23 f8 ff
> RSP: 0018:ffffc9000c56f7b0 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffff88807efc6f30 RCX: 0000000000000000
> RDX: ffff8880464fd7c0 RSI: ffffffff81be733d RDI: fffff520018adedb
> RBP: ffffea0000c68080 R08: 0000000000000056 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000001 R12: ffffea0000c68000
> R13: 0000000000000001 R14: ffffea0000c68088 R15: 0000000000000000
> FS:  00007f717898a700(0000) GS:ffff888119f80000(0000) knlGS:00000= 00000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f7178947d78 CR3: 000000004a9e6000 CR4: 0000000000350ee0
>
--_000_IA1PR07MB9830687500C25B4253EC4EB9ABCF9IA1PR07MB9830namp_--