On 3/27/23 05:40, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 7c4a254d78f8 Add linux-next specific files for 20230323 Known issue already fixed in newer -next. > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=15f70246c80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=20fd034702e6edd2 > dashboard link: https://syzkaller.appspot.com/bug?extid=a2fd5af4a33891110a79 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/dc0bbbecd2a5/disk-7c4a254d.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/6b2c8c7cfd4b/vmlinux-7c4a254d.xz > kernel image: https://storage.googleapis.com/syzbot-assets/ae312a388585/bzImage-7c4a254d.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+a2fd5af4a33891110a79@xxxxxxxxxxxxxxxxxxxxxxxxx > > general protection fault, probably for non-canonical address 0xdffffc0000000018: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] > CPU: 1 PID: 5080 Comm: syz-fuzzer Not tainted 6.3.0-rc3-next-20230323-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 > RIP: 0010:vma_merge+0x234/0x1fd0 mm/mmap.c:952 > Code: 08 00 0f 84 b0 03 00 00 e8 e9 54 bf ff 48 8b 44 24 08 48 8d b8 a8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 18 00 00 48 8b 44 24 08 48 8b b0 a8 00 00 00 > RSP: 0018:ffffc90003d0f998 EFLAGS: 00010207 > RAX: dffffc0000000000 RBX: ffff88802974b800 RCX: 0000000000000000 > RDX: 0000000000000018 RSI: ffffffff81c37957 RDI: 00000000000000c7 > RBP: ffff888079aaa400 R08: 0000000000000006 R09: 0000000000000000 > R10: 000000c001ffffff R11: 0000000000000000 R12: 0000000000000001 > R13: 0000000000000000 R14: 000000c002000000 R15: 0000000000000000 > FS: 000000c000524890(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fe510676000 CR3: 00000000249a5000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > madvise_update_vma+0x23f/0xd40 mm/madvise.c:153 > madvise_vma_behavior+0x7f6/0x20e0 mm/madvise.c:1091 > madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1260 > do_madvise.part.0+0x193/0x470 mm/madvise.c:1439 > do_madvise mm/madvise.c:1452 [inline] > __do_sys_madvise mm/madvise.c:1452 [inline] > __se_sys_madvise mm/madvise.c:1450 [inline] > __x64_sys_madvise+0x117/0x150 mm/madvise.c:1450 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x46b557 > Code: 8b 24 24 48 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 48 c7 c0 1c 00 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 > RSP: 002b:000000c00022de60 EFLAGS: 00000206 ORIG_RAX: 000000000000001c > RAX: ffffffffffffffda RBX: 0000000000a12000 RCX: 000000000046b557 > RDX: 000000000000000e RSI: 0000000000800000 RDI: 000000c001c00000 > RBP: 000000c00022de88 R08: 0000000000000509 R09: 000000c001b6a000 > R10: 00000000000012bd R11: 0000000000000206 R12: 0000000000000509 > R13: 0000000000000003 R14: 000000c0003f1a00 R15: 00000000010e0700 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:vma_merge+0x234/0x1fd0 mm/mmap.c:952 > Code: 08 00 0f 84 b0 03 00 00 e8 e9 54 bf ff 48 8b 44 24 08 48 8d b8 a8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 4d 18 00 00 48 8b 44 24 08 48 8b b0 a8 00 00 00 > RSP: 0018:ffffc90003d0f998 EFLAGS: 00010207 > RAX: dffffc0000000000 RBX: ffff88802974b800 RCX: 0000000000000000 > RDX: 0000000000000018 RSI: ffffffff81c37957 RDI: 00000000000000c7 > RBP: ffff888079aaa400 R08: 0000000000000006 R09: 0000000000000000 > R10: 000000c001ffffff R11: 0000000000000000 R12: 0000000000000001 > R13: 0000000000000000 R14: 000000c002000000 R15: 0000000000000000 > FS: 000000c000524890(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000564702bbb078 CR3: 00000000249a5000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: 08 00 or %al,(%rax) > 2: 0f 84 b0 03 00 00 je 0x3b8 > 8: e8 e9 54 bf ff callq 0xffbf54f6 > d: 48 8b 44 24 08 mov 0x8(%rsp),%rax > 12: 48 8d b8 a8 00 00 00 lea 0xa8(%rax),%rdi > 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 20: fc ff df > 23: 48 89 fa mov %rdi,%rdx > 26: 48 c1 ea 03 shr $0x3,%rdx > * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction > 2e: 0f 85 4d 18 00 00 jne 0x1881 > 34: 48 8b 44 24 08 mov 0x8(%rsp),%rax > 39: 48 8b b0 a8 00 00 00 mov 0xa8(%rax),%rsi > > > --- > 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >
