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bh=g0C73GKmjpMXW9dJYrRm/0TuGOb0XD/jqP5+uC2/nv0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=zqZAELU+KfADET3Y9HwHnDI5EZM5TP+HUlNSUQjdtSSWT6h59WvFWBh8J4oii56C4 FqtisJzMwvxxVX4x0/nd4OC4KJBqjgyTAWhpLTQACID9tFNjCDzLcLW2hN9bQ7/hIj 06kTXbfZW0Rw9tVOus+IQ0b3mUy487Nx5vMIDTsA= Date: Wed, 25 Jan 2023 16:13:30 -0800 From: Andrew Morton To: Sanan Hasanov Cc: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "contact@pgazz.com" , "syzkaller@googlegroups.com" , Liam Howlett , Matthew Wilcox Subject: Re: kernel BUG in page_add_anon_rmap Message-Id: <20230125161330.eeef53faa3f35809c64fae8d@linux-foundation.org> In-Reply-To: References: X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: CAE57140012 X-Stat-Signature: qqpg1k48ieqwndsr8ebubekzkp18hkfo X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1674692014-551151 X-HE-Meta: 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 4b6nW5dW fyb2YAyMauoKcYE03m534+Yb3Tbyis0Wxpivu5wdUUSM8eg8/eZGVE7S/hC4GvV7UJnhuw4YrF5Xd3Lg+vrOfhRKRYmu6gM2BXCOHOa4PRTAQkwgh2eFNffVPfHiSdGIa2CRO/fa1hAf1GOHLdkWljlaS3HK9zM2XTq7E+DgvAf/RwcSFXzpGEnKn2gqHckFfcHohwYR6WUXAcqlX9bEDI7I879BEvPuRzCGLTxrb8iLynm/7/6EEkRB6QeOYJgmtnyDjpxdiIGlZKCYflh6BGziDOFHnJIwt8wj7lW9gNDFILEzc4wZPikwOiC28qIg5PC1yPw35dPE45qQdd5r6n4wVgIp0G5f30sJjNF+Zo3ghO/OjisMQDc/f5NcHfV1TFrAodGoqn/vNn1MQzDtTXBZNzbsHUsLvJaqRRNly3V3OxzH4i7xaFiaLuumn1H4qlHcKzEobGyY5gvVL6mZS43BBCYLWU8oTeM9P X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, 25 Jan 2023 23:59:16 +0000 Sanan Hasanov wrote: > Good day, dear maintainers, >=20 > We found a bug using a modified kernel configuration file used by syzbot. >=20 > We enhanced the coverage of the configuration file using our tool, klocal= izer. >=20 > Kernel Branch:=A06.2.0-rc5-next-20230124 > Kernel config:=A0https://drive.google.com/file/d/1MZSgIF4R9QfikEuF5siUIZV= Pce-GiJQK/view?usp=3Dsharing > Reproducer:=A0https://drive.google.com/file/d/1H5KWkT9VVMWTUVVgIaZi6J-fmu= kRx-BM/view?usp=3Dsharing Helpful. >=20 > Thank you! >=20 > Best regards, > Sanan Hasanov >=20 > head: 0000000000020000 0000000000000000 00000004ffffffff ffff8881002b8000 > page dumped because: VM_BUG_ON_PAGE(!first && (flags & (( rmap_t)((((1UL)= )) << (0))))) > ------------[ cut here ]------------ > kernel BUG at mm/rmap.c:1248! I assume this is recent? Matthew and Liam were in here recently. > 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 > 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