Date:   Tue, 26 Mar 2019 08:38:15 +0000
From:   Salil Mehta <salil.mehta@...wei.com>
To:     syzbot <syzbot+e350b81e95a6a214da8a@...kaller.appspotmail.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-hams@...r.kernel.org" <linux-hams@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "ralf@...ux-mips.org" <ralf@...ux-mips.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: RE: inconsistent lock state in ax25_std_heartbeat_expiry

Not reproducible on our setup either. Thanks for reporting though.
We will keep an eye!

Salil.
> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of syzbot
> Sent: Monday, March 25, 2019 6:55 PM
> To: davem@...emloft.net; linux-hams@...r.kernel.org; linux-
> kernel@...r.kernel.org; netdev@...r.kernel.org; ralf@...ux-mips.org;
> syzkaller-bugs@...glegroups.com
> Subject: inconsistent lock state in ax25_std_heartbeat_expiry
> 
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    5f543a54 net: hns3: fix for not calculating tx bd num
> corr..
> git tree:       net
> console output:
> https://syzkaller.appspot.com/x/log.txt?x=10c8652b200000
> kernel config:
> https://syzkaller.appspot.com/x/.config?x=f05902bca21d8935
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=e350b81e95a6a214da8a
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> 
> Unfortunately, I don't have any reproducer for this crash yet.
> 
> IMPORTANT: if you fix the bug, please add the following tag to the
> commit:
> Reported-by: syzbot+e350b81e95a6a214da8a@...kaller.appspotmail.com
> 
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:66:56:21:74:14:df, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> ================================
> WARNING: inconsistent lock state
> 5.0.0+ #134 Not tainted
> --------------------------------
> inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
> ksoftirqd/1/16 [HC0[0]:SC1[1]:HE1:SE0] takes:
> 000000008282a7d4 (slock-AF_AX25){+.?.}, at: spin_lock
> include/linux/spinlock.h:329 [inline]
> 000000008282a7d4 (slock-AF_AX25){+.?.}, at:
> ax25_std_heartbeat_expiry+0x5d/0x3e0 net/ax25/ax25_std_timer.c:37
> {SOFTIRQ-ON-W} state was registered at:
>    lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
>    __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
>    _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
>    spin_lock include/linux/spinlock.h:329 [inline]
>    ax25_rt_autobind+0x3ca/0x720 net/ax25/ax25_route.c:432
>    ax25_connect.cold+0x30/0xa4 net/ax25/af_ax25.c:1224
>    __sys_connect+0x266/0x330 net/socket.c:1808
>    __do_sys_connect net/socket.c:1819 [inline]
>    __se_sys_connect net/socket.c:1816 [inline]
>    __x64_sys_connect+0x73/0xb0 net/socket.c:1816
>    do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
>    entry_SYSCALL_64_after_hwframe+0x49/0xbe
> irq event stamp: 296868110
> hardirqs last  enabled at (296868110): [<ffffffff870f1ad8>]
> __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
> hardirqs last  enabled at (296868110): [<ffffffff870f1ad8>]
> _raw_spin_unlock_irq+0x28/0x90 kernel/locking/spinlock.c:192
> hardirqs last disabled at (296868109): [<ffffffff870f1c4a>]
> __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline]
> hardirqs last disabled at (296868109): [<ffffffff870f1c4a>]
> _raw_spin_lock_irq+0x3a/0x80 kernel/locking/spinlock.c:160
> softirqs last  enabled at (296868102): [<ffffffff87400662>]
> __do_softirq+0x662/0x95a kernel/softirq.c:320
> softirqs last disabled at (296868107): [<ffffffff8144c8ae>]
> run_ksoftirqd
> kernel/softirq.c:655 [inline]
> softirqs last disabled at (296868107): [<ffffffff8144c8ae>]
> run_ksoftirqd+0x8e/0x110 kernel/softirq.c:647
> 
> other info that might help us debug this:
>   Possible unsafe locking scenario:
> 
>         CPU0
>         ----
>    lock(slock-AF_AX25);
>    <Interrupt>
>      lock(slock-AF_AX25);
> 
>   *** DEADLOCK ***
> 
> 1 lock held by ksoftirqd/1/16:
>   #0: 00000000654921c3 ((&ax25->timer)){+.-.}, at: lockdep_copy_map
> include/linux/lockdep.h:170 [inline]
>   #0: 00000000654921c3 ((&ax25->timer)){+.-.}, at:
> call_timer_fn+0xda/0x720
> kernel/time/timer.c:1315
> 
> stack backtrace:
> CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.0.0+ #134
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0x172/0x1f0 lib/dump_stack.c:113
>   print_usage_bug.cold+0x330/0x42a kernel/locking/lockdep.c:2839
>   valid_state kernel/locking/lockdep.c:2852 [inline]
>   mark_lock_irq kernel/locking/lockdep.c:3046 [inline]
>   mark_lock+0xd58/0x1380 kernel/locking/lockdep.c:3421
>   mark_irqflags kernel/locking/lockdep.c:3299 [inline]
>   __lock_acquire+0x1654/0x3fb0 kernel/locking/lockdep.c:3653
>   lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4211
>   __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
>   _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
>   spin_lock include/linux/spinlock.h:329 [inline]
>   ax25_std_heartbeat_expiry+0x5d/0x3e0 net/ax25/ax25_std_timer.c:37
>   ax25_heartbeat_expiry+0xf3/0x120 net/ax25/ax25_timer.c:141
>   call_timer_fn+0x190/0x720 kernel/time/timer.c:1325
>   expire_timers kernel/time/timer.c:1362 [inline]
>   __run_timers kernel/time/timer.c:1681 [inline]
>   __run_timers kernel/time/timer.c:1649 [inline]
>   run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1694
>   __do_softirq+0x266/0x95a kernel/softirq.c:293
>   run_ksoftirqd kernel/softirq.c:655 [inline]
>   run_ksoftirqd+0x8e/0x110 kernel/softirq.c:647
>   smpboot_thread_fn+0x6ab/0xa10 kernel/smpboot.c:164
>   kthread+0x357/0x430 kernel/kthread.c:253
>   ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
> net_ratelimit: 21613 callbacks suppressed
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:66:56:21:74:14:df, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:66:56:21:74:14:df, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> net_ratelimit: 16407 callbacks suppressed
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:66:56:21:74:14:df, vlan:0)
> bridge0: received packet on bridge_slave_0 with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
> bridge0: received packet on veth0_to_bridge with own address as source
> address (addr:66:56:21:74:14:df, vlan:0)
> 
> 
> ---
> This bug 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 bug report. See:
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