On Thu, Feb 17, 2022 at 10:01 AM syzbot <syzbot+1e3ea63db39f2b4440e0@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: c5d9ae265b10 Merge tag 'for-linus' of git://git.kernel.org.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=132e687c700000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a78b064590b9f912 > dashboard link: https://syzkaller.appspot.com/bug?extid=1e3ea63db39f2b4440e0 > 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+1e3ea63db39f2b4440e0@xxxxxxxxxxxxxxxxxxxxxxxxx > > WARNING: CPU: 1 PID: 10828 at drivers/vhost/vhost.c:715 vhost_dev_cleanup+0x8b8/0xbc0 drivers/vhost/vhost.c:715 > Modules linked in: > CPU: 0 PID: 10828 Comm: syz-executor.0 Not tainted 5.17.0-rc4-syzkaller-00051-gc5d9ae265b10 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:vhost_dev_cleanup+0x8b8/0xbc0 drivers/vhost/vhost.c:715 Probably a hint that we are missing a flush. Looking at vhost_vsock_stop() that is called by vhost_vsock_dev_release(): static int vhost_vsock_stop(struct vhost_vsock *vsock) { size_t i; int ret; mutex_lock(&vsock->dev.mutex); ret = vhost_dev_check_owner(&vsock->dev); if (ret) goto err; Where it could fail so the device is not actually stopped. I wonder if this is something related. Thanks > Code: c7 85 90 01 00 00 00 00 00 00 e8 53 6e a2 fa 48 89 ef 48 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f e9 7d d6 ff ff e8 38 6e a2 fa <0f> 0b e9 46 ff ff ff 48 8b 7c 24 10 e8 87 00 ea fa e9 75 f7 ff ff > RSP: 0018:ffffc9000fe6fa18 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 > RDX: ffff888021b63a00 RSI: ffffffff86d66fe8 RDI: ffff88801cc200b0 > RBP: ffff88801cc20000 R08: 0000000000000001 R09: 0000000000000001 > R10: ffffffff817f1e08 R11: 0000000000000000 R12: ffff88801cc200d0 > R13: ffff88801cc20120 R14: ffff88801cc200d0 R15: 0000000000000002 > FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2de25000 CR3: 000000004c9cd000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > vhost_vsock_dev_release+0x36e/0x4b0 drivers/vhost/vsock.c:771 > __fput+0x286/0x9f0 fs/file_table.c:313 > task_work_run+0xdd/0x1a0 kernel/task_work.c:164 > exit_task_work include/linux/task_work.h:32 [inline] > do_exit+0xb29/0x2a30 kernel/exit.c:806 > do_group_exit+0xd2/0x2f0 kernel/exit.c:935 > get_signal+0x45a/0x2490 kernel/signal.c:2863 > arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 > handle_signal_work kernel/entry/common.c:148 [inline] > exit_to_user_mode_loop kernel/entry/common.c:172 [inline] > exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 > __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] > syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 > do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x7f4027a46481 > Code: Unable to access opcode bytes at RIP 0x7f4027a46457. > RSP: 002b:00007f402808ba68 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 > RAX: fffffffffffffffc RBX: 00007f402622e700 RCX: 00007f4027a46481 > RDX: 00007f402622e9d0 RSI: 00007f402622e2f0 RDI: 00000000003d0f00 > RBP: 00007f402808bcb0 R08: 00007f402622e700 R09: 00007f402622e700 > R10: 00007f402622e9d0 R11: 0000000000000206 R12: 00007f402808bb1e > R13: 00007f402808bb1f R14: 00007f402622e300 R15: 0000000000022000 > </TASK> > > > --- > 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. > _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
