netdev - Re: [syzbot] [net?] [virt?] [io-uring?] [kvm?] BUG: soft lockup in vsock

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Message-ID: <ZBUGp5bvNuE3sK5g@bullseye>
Date:   Sat, 18 Mar 2023 00:32:39 +0000
From:   Bobby Eshleman <bobbyeshleman@...il.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     Bobby Eshleman <bobby.eshleman@...edance.com>,
        Bobby Eshleman <bobby.eshleman@...il.com>,
        syzbot <syzbot+0bc015ebddc291a97116@...kaller.appspotmail.com>,
        axboe@...nel.dk, davem@...emloft.net, edumazet@...gle.com,
        io-uring@...r.kernel.org, kuba@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, stefanha@...hat.com,
        syzkaller-bugs@...glegroups.com,
        virtualization@...ts.linux-foundation.org,
        Krasnov Arseniy <oxffffaa@...il.com>,
        Krasnov Arseniy Vladimirovich <AVKrasnov@...rdevices.ru>
Subject: Re: [syzbot] [net?] [virt?] [io-uring?] [kvm?] BUG: soft lockup in
 vsock_connect

On Fri, Mar 24, 2023 at 09:38:38AM +0100, Stefano Garzarella wrote:
> Hi Bobby,
> FYI we have also this one, but it seems related to
> syzbot+befff0a9536049e7902e@...kaller.appspotmail.com
> 
> Thanks,
> Stefano
> 

Got it, I'll look into it.

Best,
Bobby

> 
> On Fri, Mar 24, 2023 at 1:52 AM syzbot
> <syzbot+0bc015ebddc291a97116@...kaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    fe15c26ee26e Linux 6.3-rc1
> > git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> > console output: https://syzkaller.appspot.com/x/log.txt?x=1577c97ec80000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=7573cbcd881a88c9
> > dashboard link: https://syzkaller.appspot.com/bug?extid=0bc015ebddc291a97116
> > compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
> > userspace arch: arm64
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1077c996c80000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17e38929c80000
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/89d41abd07bd/disk-fe15c26e.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/fa75f5030ade/vmlinux-fe15c26e.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/590d0f5903ee/Image-fe15c26e.gz.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+0bc015ebddc291a97116@...kaller.appspotmail.com
> >
> > watchdog: BUG: soft lockup - CPU#0 stuck for 27s! [syz-executor244:6747]
> > Modules linked in:
> > irq event stamp: 6033
> > hardirqs last  enabled at (6032): [<ffff8000124604ac>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
> > hardirqs last  enabled at (6032): [<ffff8000124604ac>] exit_to_kernel_mode+0xe8/0x118 arch/arm64/kernel/entry-common.c:94
> > hardirqs last disabled at (6033): [<ffff80001245e188>] __el1_irq arch/arm64/kernel/entry-common.c:468 [inline]
> > hardirqs last disabled at (6033): [<ffff80001245e188>] el1_interrupt+0x24/0x68 arch/arm64/kernel/entry-common.c:486
> > softirqs last  enabled at (616): [<ffff80001066ca80>] spin_unlock_bh include/linux/spinlock.h:395 [inline]
> > softirqs last  enabled at (616): [<ffff80001066ca80>] lock_sock_nested+0xe8/0x138 net/core/sock.c:3480
> > softirqs last disabled at (618): [<ffff8000122dbcfc>] spin_lock_bh include/linux/spinlock.h:355 [inline]
> > softirqs last disabled at (618): [<ffff8000122dbcfc>] virtio_transport_purge_skbs+0x11c/0x500 net/vmw_vsock/virtio_transport_common.c:1372
> > CPU: 0 PID: 6747 Comm: syz-executor244 Not tainted 6.3.0-rc1-syzkaller-gfe15c26ee26e #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
> > pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > pc : __sanitizer_cov_trace_pc+0xc/0x8c kernel/kcov.c:203
> > lr : virtio_transport_purge_skbs+0x19c/0x500 net/vmw_vsock/virtio_transport_common.c:1374
> > sp : ffff80001e787890
> > x29: ffff80001e7879e0 x28: 1ffff00003cf0f2a x27: ffff80001a487a60
> > x26: ffff80001e787950 x25: ffff0000ce2d3b80 x24: ffff80001a487a78
> > x23: 1ffff00003490f4c x22: ffff80001a29c1a8 x21: dfff800000000000
> > x20: ffff80001a487a60 x19: ffff80001e787940 x18: 1fffe000368951b6
> > x17: ffff800015cdd000 x16: ffff8000085110b0 x15: 0000000000000000
> > x14: 1ffff00002b9c0b2 x13: dfff800000000000 x12: ffff700003cf0efc
> > x11: ff808000122dbee8 x10: 0000000000000000 x9 : ffff8000122dbee8
> > x8 : ffff0000ce511b40 x7 : ffff8000122dbcfc x6 : 0000000000000000
> > x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80000832d758
> > x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
> > Call trace:
> >  get_current arch/arm64/include/asm/current.h:19 [inline]
> >  __sanitizer_cov_trace_pc+0xc/0x8c kernel/kcov.c:206
> >  vsock_loopback_cancel_pkt+0x28/0x3c net/vmw_vsock/vsock_loopback.c:48
> >  vsock_transport_cancel_pkt net/vmw_vsock/af_vsock.c:1284 [inline]
> >  vsock_connect+0x6b8/0xaec net/vmw_vsock/af_vsock.c:1426
> >  __sys_connect_file net/socket.c:2004 [inline]
> >  __sys_connect+0x268/0x290 net/socket.c:2021
> >  __do_sys_connect net/socket.c:2031 [inline]
> >  __se_sys_connect net/socket.c:2028 [inline]
> >  __arm64_sys_connect+0x7c/0x94 net/socket.c:2028
> >  __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
> >  invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
> >  el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
> >  do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193
> >  el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
> >  el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
> >  el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
> >
> >
> > ---
> > 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@...glegroups.com.
> >
> > syzbot will keep track of this issue. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> > syzbot can test patches for this issue, for details see:
> > https://goo.gl/tpsmEJ#testing-patches
> >
>