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[2003:cb:c720:6400:963d:9726:6d56:aa61]) by smtp.gmail.com with ESMTPSA id a3-20020a5d53c3000000b00336751cd4ebsm133342wrw.72.2024.01.04.13.36.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 Jan 2024 13:36:45 -0800 (PST) Message-ID: <36ace74a-1de7-4224-8bc1-7f487764f6e2@redhat.com> Date: Thu, 4 Jan 2024 22:36:44 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in __folio_rmap_sanity_checks To: "Yin, Fengwei" , syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ryan.roberts@arm.com, syzkaller-bugs@googlegroups.com, Matthew Wilcox References: <000000000000014174060e09316e@google.com> <3feecbd6-b3bd-440c-a4f9-2a7dba3ff8f1@intel.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL 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bq2glRo/52EbTB6oAgPcfHSTMZDvSMi3XiDQokkYJ6+QwVkBfh8nFDyqKrMK694ph/ewWY5GvF6DH2Tn2PFGpQ== 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 03.01.24 15:16, Yin, Fengwei wrote: > > > On 1/3/2024 8:13 PM, David Hildenbrand wrote: >> On 03.01.24 12:48, syzbot wrote: >>> Hello, >>> >>> syzbot found the following issue on: >>> >>> HEAD commit:    ab0b3e6ef50d Add linux-next specific files for 20240102 >>> git tree:       linux-next >>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=17be3e09e80000 >>> kernel config: >>> https://syzkaller.appspot.com/x/.config?x=a14a6350374945f9 >>> dashboard link: >>> https://syzkaller.appspot.com/bug?extid=50ef73537bbc393a25bb >>> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils >>> for Debian) 2.40 >>> syz repro: >>> https://syzkaller.appspot.com/x/repro.syz?x=14e2256ee80000 >>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17b57db5e80000 >>> >>> Downloadable assets: >>> disk image: >>> https://storage.googleapis.com/syzbot-assets/4e6376fe5764/disk-ab0b3e6e.raw.xz >>> vmlinux: >>> https://storage.googleapis.com/syzbot-assets/7cb9ecbaf001/vmlinux-ab0b3e6e.xz >>> kernel image: >>> https://storage.googleapis.com/syzbot-assets/2c1a9a6d424f/bzImage-ab0b3e6e.xz >>> >>> The issue was bisected to: >>> >>> commit 68f0320824fa59c5429cbc811e6c46e7a30ea32c >>> Author: David Hildenbrand >>> Date:   Wed Dec 20 22:44:31 2023 +0000 >>> >>>      mm/rmap: convert folio_add_file_rmap_range() into >>> folio_add_file_rmap_[pte|ptes|pmd]() >>> >>> bisection log: >>> https://syzkaller.appspot.com/x/bisect.txt?x=10b9e1b1e80000 >>> final oops: >>> https://syzkaller.appspot.com/x/report.txt?x=12b9e1b1e80000 >>> console output: https://syzkaller.appspot.com/x/log.txt?x=14b9e1b1e80000 >>> >>> IMPORTANT: if you fix the issue, please add the following tag to the >>> commit: >>> Reported-by: syzbot+50ef73537bbc393a25bb@syzkaller.appspotmail.com >>> Fixes: 68f0320824fa ("mm/rmap: convert folio_add_file_rmap_range() >>> into folio_add_file_rmap_[pte|ptes|pmd]()") >>> >>>   kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:283 >>>   __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:324 >>>   kasan_slab_alloc include/linux/kasan.h:201 [inline] >>>   slab_post_alloc_hook mm/slub.c:3813 [inline] >>>   slab_alloc_node mm/slub.c:3860 [inline] >>>   kmem_cache_alloc+0x136/0x320 mm/slub.c:3867 >>>   vm_area_alloc+0x1f/0x220 kernel/fork.c:465 >>>   mmap_region+0x3ae/0x2a90 mm/mmap.c:2804 >>>   do_mmap+0x890/0xef0 mm/mmap.c:1379 >>>   vm_mmap_pgoff+0x1a7/0x3c0 mm/util.c:573 >>>   ksys_mmap_pgoff+0x421/0x5a0 mm/mmap.c:1425 >>>   __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] >>>   __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] >>>   __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:86 >>>   do_syscall_x64 arch/x86/entry/common.c:52 [inline] >>>   do_syscall_64+0xd0/0x250 arch/x86/entry/common.c:83 >>>   entry_SYSCALL_64_after_hwframe+0x62/0x6a >>> ------------[ cut here ]------------ >>> WARNING: CPU: 1 PID: 5059 at include/linux/rmap.h:202 >>> __folio_rmap_sanity_checks+0x4d5/0x630 include/linux/rmap.h:202 >>> Modules linked in: >>> CPU: 1 PID: 5059 Comm: syz-executor115 Not tainted >>> 6.7.0-rc8-next-20240102-syzkaller #0 >>> Hardware name: Google Google Compute Engine/Google Compute Engine, >>> BIOS Google 11/17/2023 >>> RIP: 0010:__folio_rmap_sanity_checks+0x4d5/0x630 include/linux/rmap.h:202 >>> Code: 41 83 e4 01 44 89 e6 e8 79 bc b7 ff 45 84 e4 0f 85 08 fc ff ff >>> e8 3b c1 b7 ff 48 c7 c6 e0 b5 d9 8a 48 89 df e8 5c 12 f7 ff 90 <0f> 0b >>> 90 e9 eb fb ff ff e8 1e c1 b7 ff be 01 00 00 00 48 89 df e8 >>> RSP: 0018:ffffc900038df978 EFLAGS: 00010293 >>> RAX: 0000000000000000 RBX: ffffea00008cde00 RCX: ffffffff81687419 >>> RDX: ffff88807becbb80 RSI: ffffffff81d06104 RDI: 0000000000000000 >>> RBP: ffffea00008cde00 R08: 0000000000000000 R09: fffffbfff1e75f6a >>> R10: ffffffff8f3afb57 R11: 0000000000000001 R12: 0000000000000000 >>> R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000 >>> FS:  0000555556508380(0000) GS:ffff8880b9900000(0000) >>> knlGS:0000000000000000 >>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 00000000200000c0 CR3: 0000000079000000 CR4: 00000000003506f0 >>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >>> Call Trace: >>>   >>>   __folio_add_rmap mm/rmap.c:1167 [inline] >>>   __folio_add_file_rmap mm/rmap.c:1452 [inline] >>>   folio_add_file_rmap_ptes+0x8e/0x2c0 mm/rmap.c:1478 >>>   insert_page_into_pte_locked.isra.0+0x34d/0x960 mm/memory.c:1874 >>>   insert_page mm/memory.c:1900 [inline] >>>   vm_insert_page+0x62c/0x8c0 mm/memory.c:2053 >>>   packet_mmap+0x314/0x570 net/packet/af_packet.c:4594 >>>   call_mmap include/linux/fs.h:2090 [inline] >>>   mmap_region+0x745/0x2a90 mm/mmap.c:2819 >>>   do_mmap+0x890/0xef0 mm/mmap.c:1379 >>>   vm_mmap_pgoff+0x1a7/0x3c0 mm/util.c:573 >>>   ksys_mmap_pgoff+0x421/0x5a0 mm/mmap.c:1425 >>>   __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] >>>   __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] >>>   __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:86 >>>   do_syscall_x64 arch/x86/entry/common.c:52 [inline] >>>   do_syscall_64+0xd0/0x250 arch/x86/entry/common.c:83 >>>   entry_SYSCALL_64_after_hwframe+0x62/0x6a >> >> If I am not wrong, that triggers: >> >> VM_WARN_ON_FOLIO(folio_test_large(folio) && >>          !folio_test_large_rmappable(folio), folio); >> >> So we are trying to rmap a large folio that did not go through >> folio_prep_large_rmappable(). >> >> net/packet/af_packet.c calls vm_insert_page() on some pages/folios stoed >> in the "struct packet_ring_buffer". No idea where that comes from, but I >> suspect it's simply some compound allocation. > Looks like: > alloc_pg_vec > alloc_one_pg_vec_page > gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | > __GFP_ZERO | __GFP_NOWARN | __GFP_NORETRY; > > buffer = (char *) __get_free_pages(gfp_flags, order); > So you are right here... :). Hm, but I wonder if this something that's supposed to work or is this one of the cases where we should actually use a VM_PFN mapping? It's not a pagecache(file/shmem) page after all. We could relax that check and document why we expect something that is not marked rmappable. But it fells wrong. I suspect this should be a VM_PFNMAP instead (like recent udmabuf changes). -- Cheers, David / dhildenb