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[2003:cb:c744:ac00:ef5c:b66d:1075:254a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42e96a36292sm50829035e9.32.2024.09.26.08.45.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 26 Sep 2024 08:45:39 -0700 (PDT) Message-ID: Date: Thu, 26 Sep 2024 17:45:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in copy_huge_pmd To: syzbot , akpm@linux-foundation.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, jgg@ziepe.ca, leitao@debian.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mingo@redhat.com, peterx@redhat.com, rppt@kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org References: <66f15c8d.050a0220.c23dd.000f.GAE@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL 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G4i81wb6RGxsQcOjlk14YNtH39FjoM6YX/RxFWWtbEOdDSV3rl6nzOpOf3JYlAgOPA+n1o3WL9U3C96eGa2rOulG+tgFyf+8bnt6upzkzEhpAlXnKHak6CIBY0PnsCmjvUkLnIhhtbtujxwZ3wEdsQunn2ZdHKRD11oT6Q9feE8l143b2S9xFmg4TaY0gjQKCgYwQUra6Jmb55g7MI2BMP9dggwTXD3ybTzuDi70bOH9HbHuqZrOmIvocIK13F3V99z/0y0vktxxJTcdvOD1QYonmkLyRpiHbp2fXZasOWhJe723daH2K/xX9lpDIqL1 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: List-Subscribe: List-Unsubscribe: On 23.09.24 14:18, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 88264981f208 Merge tag 'sched_ext-for-6.12' of git://git.k.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=16c36c27980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e851828834875d6f > dashboard link: https://syzkaller.appspot.com/bug?extid=bf2c35fa302ebe3c7471 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12773080580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ed5e9f980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/0e011ac37c93/disk-88264981.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/f5c65577e19e/vmlinux-88264981.xz > kernel image: https://storage.googleapis.com/syzbot-assets/984d963c8ea1/bzImage-88264981.xz > > The issue was bisected to: > > commit 75182022a0439788415b2dd1db3086e07aa506f7 > Author: Peter Xu > Date: Mon Aug 26 20:43:51 2024 +0000 > > mm/x86: support large pfn mappings > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17df9c27980000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=143f9c27980000 > console output: https://syzkaller.appspot.com/x/log.txt?x=103f9c27980000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+bf2c35fa302ebe3c7471@syzkaller.appspotmail.com > Fixes: 75182022a043 ("mm/x86: support large pfn mappings") > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 5508 at mm/huge_memory.c:1602 copy_huge_pmd+0x102c/0x1c60 mm/huge_memory.c:1602 > Modules linked in: > CPU: 1 UID: 0 PID: 5508 Comm: syz-executor274 Not tainted 6.11.0-syzkaller-08481-g88264981f208 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 > RIP: 0010:copy_huge_pmd+0x102c/0x1c60 mm/huge_memory.c:1602 > Code: ff 90 0f 0b 90 e9 2e f5 ff ff e8 8f fc 92 ff 48 ff cb e9 0f f7 ff ff e8 82 fc 92 ff 48 ff cb e9 8a f7 ff ff e8 75 fc 92 ff 90 <0f> 0b 90 e9 11 fd ff ff 4c 8d ac 24 00 01 00 00 48 b8 06 fe ff ff > RSP: 0018:ffffc90003cdf0c0 EFLAGS: 00010293 > RAX: ffffffff8201bd3b RBX: ffff88803090c118 RCX: ffff8880317a9e00 > RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 > RBP: ffffc90003cdf248 R08: ffffffff8201bc06 R09: 1ffffffff2038ef5 > R10: dffffc0000000000 R11: fffffbfff2038ef6 R12: ffff88802fab89c0 > R13: d7ffe7fff1cbfe02 R14: 0000000000000020 R15: ffff888031e5b780 > FS: 00007f38182a06c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f381831d9f0 CR3: 000000007b18c000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > copy_pmd_range+0x425/0x85f0 mm/memory.c:1245 > copy_pud_range mm/memory.c:1292 [inline] > copy_p4d_range mm/memory.c:1316 [inline] > copy_page_range+0x99f/0xe90 mm/memory.c:1414 > dup_mmap kernel/fork.c:750 [inline] > dup_mm kernel/fork.c:1674 [inline] > copy_mm+0x11fb/0x1f40 kernel/fork.c:1723 > copy_process+0x1845/0x3d50 kernel/fork.c:2375 > kernel_clone+0x226/0x8f0 kernel/fork.c:2787 > __do_sys_clone3 kernel/fork.c:3091 [inline] > __se_sys_clone3+0x2cb/0x350 kernel/fork.c:3070 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f3818306429 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 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 b0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f38182a0118 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 > RAX: ffffffffffffffda RBX: 00007f3818390318 RCX: 00007f3818306429 > RDX: 00007f38182e2ab6 RSI: 0000000000000058 RDI: 00007f38182a0120 > RBP: 00007f3818390310 R08: 00007fffb191b837 R09: 0000000000000080 > R10: 0000000000000000 R11: 0000000000000202 R12: 00007f381835d074 > R13: 00007f381839031c R14: 00007f38182a0120 R15: 000000080000000e > > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup > #syz test: https://github.com/davidhildenbrand/linux.git copy_huge_pmd_pfn -- Cheers, David / dhildenb