Stefano Garzarella
2022-Feb-21 13:12 UTC
[syzbot] general protection fault in vhost_iotlb_itree_first
#syz test: https://github.com/stefano-garzarella/linux.git vsock-fix-stop On Sat, Feb 19, 2022 at 01:18:24AM -0800, syzbot wrote:>Hello, > >syzbot found the following issue on: > >HEAD commit: 359303076163 tty: n_tty: do not look ahead for EOL charact.. >git tree: upstream >console output: https://syzkaller.appspot.com/x/log.txt?x=16b34b54700000 >kernel config: https://syzkaller.appspot.com/x/.config?x=da674567f7b6043d >dashboard link: https://syzkaller.appspot.com/bug?extid=bbb030fc51d6f3c5d067 >compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > >Unfortunately, I don't have any reproducer for this issue yet. > >IMPORTANT: if you fix the issue, please add the following tag to the commit: >Reported-by: syzbot+bbb030fc51d6f3c5d067 at syzkaller.appspotmail.com > >general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN >KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] >CPU: 1 PID: 17981 Comm: vhost-17980 Not tainted 5.17.0-rc4-syzkaller-00052-g359303076163 #0 >Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 >RIP: 0010:vhost_iotlb_itree_iter_first drivers/vhost/iotlb.c:19 [inline] >RIP: 0010:vhost_iotlb_itree_first+0x29/0x280 drivers/vhost/iotlb.c:169 >Code: 00 41 57 41 56 41 55 49 89 d5 41 54 55 48 89 fd 53 48 89 f3 e8 e8 eb a0 fa 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 e8 01 00 00 4c 8b 65 00 4d 85 e4 0f 84 b3 01 00 >RSP: 0018:ffffc90004f57ac8 EFLAGS: 00010246 >RAX: dffffc0000000000 RBX: 30303030320a0028 RCX: ffffc900103dc000 >RDX: 0000000000000000 RSI: ffffffff86d72738 RDI: 0000000000000000 >RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000002 >R10: ffffffff86d62d88 R11: 0000000000000000 R12: ffff8880260e4d68 >R13: 303030305f3a3057 R14: dffffc0000000000 R15: 0000000000000000 >FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 >CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >CR2: 00007f2d46121901 CR3: 000000001d652000 CR4: 00000000003506e0 >DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >Call Trace: > <TASK> > translate_desc+0x11e/0x3e0 drivers/vhost/vhost.c:2054 > vhost_get_vq_desc+0x662/0x22c0 drivers/vhost/vhost.c:2300 > vhost_vsock_handle_tx_kick+0x277/0xa20 drivers/vhost/vsock.c:522 > vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372 > kthread+0x2e9/0x3a0 kernel/kthread.c:377 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > </TASK> >Modules linked in: >---[ end trace 0000000000000000 ]--- >RIP: 0010:vhost_iotlb_itree_iter_first drivers/vhost/iotlb.c:19 [inline] >RIP: 0010:vhost_iotlb_itree_first+0x29/0x280 drivers/vhost/iotlb.c:169 >Code: 00 41 57 41 56 41 55 49 89 d5 41 54 55 48 89 fd 53 48 89 f3 e8 e8 eb a0 fa 48 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 e8 01 00 00 4c 8b 65 00 4d 85 e4 0f 84 b3 01 00 >RSP: 0018:ffffc90004f57ac8 EFLAGS: 00010246 >RAX: dffffc0000000000 RBX: 30303030320a0028 RCX: ffffc900103dc000 >RDX: 0000000000000000 RSI: ffffffff86d72738 RDI: 0000000000000000 >RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000002 >R10: ffffffff86d62d88 R11: 0000000000000000 R12: ffff8880260e4d68 >R13: 303030305f3a3057 R14: dffffc0000000000 R15: 0000000000000000 >FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 >CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >CR2: 00007f2d449f6718 CR3: 000000001d652000 CR4: 00000000003506e0 >DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >---------------- >Code disassembly (best guess): > 0: 00 41 57 add %al,0x57(%rcx) > 3: 41 56 push %r14 > 5: 41 55 push %r13 > 7: 49 89 d5 mov %rdx,%r13 > a: 41 54 push %r12 > c: 55 push %rbp > d: 48 89 fd mov %rdi,%rbp > 10: 53 push %rbx > 11: 48 89 f3 mov %rsi,%rbx > 14: e8 e8 eb a0 fa callq 0xfaa0ec01 > 19: 48 89 ea mov %rbp,%rdx > 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 23: fc ff df > 26: 48 c1 ea 03 shr $0x3,%rdx >* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction > 2e: 0f 85 e8 01 00 00 jne 0x21c > 34: 4c 8b 65 00 mov 0x0(%rbp),%r12 > 38: 4d 85 e4 test %r12,%r12 > 3b: 0f .byte 0xf > 3c: 84 .byte 0x84 > 3d: b3 01 mov $0x1,%bl > > >--- >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 at googlegroups.com. > >syzbot will keep track of this issue. See: >https://goo.gl/tpsmEJ#status for how to communicate with syzbot. >