RE: inconsistent lock state in ax25_std_heartbeat_expiry

From: Salil Mehta
Date: Tue Mar 26 2019 - 04:38:20 EST

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

Salil.
> -----Original Message-----
> From: netdev-owner@xxxxxxxxxxxxxxx [mailto:netdev-
> owner@xxxxxxxxxxxxxxx] On Behalf Of syzbot
> Sent: Monday, March 25, 2019 6:55 PM
> To: davem@xxxxxxxxxxxxx; linux-hams@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; ralf@xxxxxxxxxxxxxx;
> syzkaller-bugs@xxxxxxxxxxxxxxxx
> 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@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> 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@xxxxxxxxxxxxxxxxx
>
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> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

Next message: Kieran Bingham: "Re: [PATCH 0/4] gdb script for kconfig and timer list"
Previous message: Jerome Brunet: "Re: [PATCH 0/1] pwm: meson: fix scheduling while atomic issue"
In reply to: syzbot: "inconsistent lock state in ax25_std_heartbeat_expiry"
Next in thread: Dmitry Vyukov: "Re: inconsistent lock state in ax25_std_heartbeat_expiry"
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