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Message-ID: <6866b332.a00a0220.c7b3.0005.GAE@google.com> Date: Thu, 03 Jul 2025 09:43:30 -0700 From: syzbot <syzbot+263f159eb37a1c4c67a4@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, horms@...nel.org, kuba@...nel.org, kuniyu@...gle.com, linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, perex@...ex.cz, syzkaller-bugs@...glegroups.com, tiwai@...e.com, willemb@...gle.com Subject: Re: [syzbot] [net?] kernel BUG in filemap_fault (2) syzbot has found a reproducer for the following issue on: HEAD commit: b4911fb0b060 Merge tag 'mmc-v6.16-rc1' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16568c8c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3f6ddf055b5c86f8 dashboard link: https://syzkaller.appspot.com/bug?extid=263f159eb37a1c4c67a4 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=157cf48c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=146a948c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5828d857f454/disk-b4911fb0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ecf6b7e29d2b/vmlinux-b4911fb0.xz kernel image: https://storage.googleapis.com/syzbot-assets/cc43b227e03d/bzImage-b4911fb0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+263f159eb37a1c4c67a4@...kaller.appspotmail.com __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4249 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1336 [inline] __ip6_append_data+0x2b8c/0x3de0 net/ipv6/ip6_output.c:1668 ip6_append_data+0x1c4/0x380 net/ipv6/ip6_output.c:1858 rawv6_sendmsg+0x124b/0x17f0 net/ipv6/raw.c:911 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:727 ____sys_sendmsg+0x52d/0x830 net/socket.c:2566 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620 __sys_sendmmsg+0x227/0x430 net/socket.c:2709 ------------[ cut here ]------------ kernel BUG at mm/filemap.c:3442! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 9236 Comm: syz.3.1035 Not tainted 6.16.0-rc4-syzkaller-00049-gb4911fb0b060 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:filemap_fault+0x117d/0x1200 mm/filemap.c:3442 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 8d 6b 29 00 e9 81 fc ff ff e8 a3 13 c8 ff 48 89 df 48 c7 c6 a0 30 94 8b e8 d4 ae 0d 00 90 <0f> 0b e8 8c 13 c8 ff 48 8b 3c 24 48 c7 c6 20 37 94 8b e8 bc ae 0d RSP: 0018:ffffc900030976e0 EFLAGS: 00010246 RAX: 864bab26a5780700 RBX: ffffea0001e53880 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8d96e815 RDI: 00000000ffffffff RBP: ffffc90003097818 R08: ffffffff8f9fdbf7 R09: 1ffffffff1f3fb7e R10: dffffc0000000000 R11: fffffbfff1f3fb7f R12: dffffc0000000000 R13: 1ffffd40003ca711 R14: ffffea0001e53898 R15: ffffea0001e53888 FS: 00007f9550ed76c0(0000) GS:ffff888125d84000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002000 CR3: 0000000059b4a000 CR4: 00000000003526f0 Call Trace: <TASK> __do_fault+0x135/0x390 mm/memory.c:5169 do_shared_fault mm/memory.c:5654 [inline] do_fault mm/memory.c:5728 [inline] do_pte_missing mm/memory.c:4251 [inline] handle_pte_fault mm/memory.c:6069 [inline] __handle_mm_fault+0x198b/0x5620 mm/memory.c:6212 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6381 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:__put_user_4+0xd/0x20 arch/x86/lib/putuser.S:94 Code: 66 89 01 31 c9 0f 01 ca e9 00 3b 03 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca e9 d7 3a 03 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003097c98 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00002000000015b8 RDX: 0000000000000000 RSI: ffffffff8db5a681 RDI: ffffffff8be1b940 RBP: ffffc90003097eb0 R08: 0000000000000000 R09: ffffffff820a3bc0 R10: dffffc0000000000 R11: ffffed100b371081 R12: 0000200000001580 R13: 0000000000040000 R14: 0000200000000480 R15: 0000000000000044 __sys_sendmmsg+0x25f/0x430 net/socket.c:2714 __do_sys_sendmmsg net/socket.c:2736 [inline] __se_sys_sendmmsg net/socket.c:2733 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2733 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f954ff8e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9550ed7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f95501b5fa0 RCX: 00007f954ff8e929 RDX: 00000000000002e9 RSI: 0000200000000480 RDI: 0000000000000004 RBP: 00007f9550010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f95501b5fa0 R15: 00007ffcd704c578 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:filemap_fault+0x117d/0x1200 mm/filemap.c:3442 Code: 38 c1 0f 8c 8e fc ff ff 4c 89 e7 e8 8d 6b 29 00 e9 81 fc ff ff e8 a3 13 c8 ff 48 89 df 48 c7 c6 a0 30 94 8b e8 d4 ae 0d 00 90 <0f> 0b e8 8c 13 c8 ff 48 8b 3c 24 48 c7 c6 20 37 94 8b e8 bc ae 0d RSP: 0018:ffffc900030976e0 EFLAGS: 00010246 RAX: 864bab26a5780700 RBX: ffffea0001e53880 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8d96e815 RDI: 00000000ffffffff RBP: ffffc90003097818 R08: ffffffff8f9fdbf7 R09: 1ffffffff1f3fb7e R10: dffffc0000000000 R11: fffffbfff1f3fb7f R12: dffffc0000000000 R13: 1ffffd40003ca711 R14: ffffea0001e53898 R15: ffffea0001e53888 FS: 00007f9550ed76c0(0000) GS:ffff888125d84000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000002000 CR3: 0000000059b4a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 66 89 01 mov %ax,(%rcx) 3: 31 c9 xor %ecx,%ecx 5: 0f 01 ca clac 8: e9 00 3b 03 00 jmp 0x33b0d d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 48 89 cb mov %rcx,%rbx 20: 48 c1 fb 3f sar $0x3f,%rbx 24: 48 09 d9 or %rbx,%rcx 27: 0f 01 cb stac * 2a: 89 01 mov %eax,(%rcx) <-- trapping instruction 2c: 31 c9 xor %ecx,%ecx 2e: 0f 01 ca clac 31: e9 d7 3a 03 00 jmp 0x33b0d 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop --- 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.
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