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Message-ID: <0F530D99-3A0D-4FC9-AD75-2DA3074B6A78@redhat.com>
Date: Thu, 23 Jul 2020 10:30:17 +0200
From: "Eelco Chaudron" <echaudro@...hat.com>
To: syzbot <syzbot+bad6507e5db05017b008@...kaller.appspotmail.com>
Cc: davem@...emloft.net, dev@...nvswitch.org, kuba@...nel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
pshelar@....org, syzkaller-bugs@...glegroups.com
Subject: Re: [ovs-dev] INFO: task hung in ovs_dp_masks_rebalance
FYI, I’m looking into this…
//Eelco
On 22 Jul 2020, at 22:52, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: fa56a987 Merge branch 'ionic-updates'
> git tree: net-next
> console output:
> https://syzkaller.appspot.com/x/log.txt?x=1105f053100000
> kernel config:
> https://syzkaller.appspot.com/x/.config?x=2b7b67c0c1819c87
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=bad6507e5db05017b008
> compiler: gcc (GCC) 10.1.0-syz 20200507
>
> 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+bad6507e5db05017b008@...kaller.appspotmail.com
>
> INFO: task kworker/1:8:10136 blocked for more than 143 seconds.
> Not tainted 5.8.0-rc4-syzkaller #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
> message.
> kworker/1:8 D27336 10136 2 0x00004000
> Workqueue: events ovs_dp_masks_rebalance
> Call Trace:
> context_switch kernel/sched/core.c:3453 [inline]
> __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
> schedule+0xd0/0x2a0 kernel/sched/core.c:4253
> schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
> __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
> __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
> ovs_lock net/openvswitch/datapath.c:105 [inline]
> ovs_dp_masks_rebalance+0x18/0x80 net/openvswitch/datapath.c:2355
> process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
> worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
> kthread+0x3b5/0x4a0 kernel/kthread.c:291
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
> INFO: task kworker/0:9:8606 blocked for more than 143 seconds.
> Not tainted 5.8.0-rc4-syzkaller #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
> message.
> kworker/0:9 D27792 8606 2 0x00004000
> Workqueue: events ovs_dp_masks_rebalance
> Call Trace:
> context_switch kernel/sched/core.c:3453 [inline]
> __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
> schedule+0xd0/0x2a0 kernel/sched/core.c:4253
> schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
> __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
> __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
> ovs_lock net/openvswitch/datapath.c:105 [inline]
> ovs_dp_masks_rebalance+0x18/0x80 net/openvswitch/datapath.c:2355
> process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
> worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
> kthread+0x3b5/0x4a0 kernel/kthread.c:291
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
> INFO: task syz-executor.2:9414 blocked for more than 143 seconds.
> Not tainted 5.8.0-rc4-syzkaller #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
> message.
> syz-executor.2 D27832 9414 7005 0x00004004
> Call Trace:
> context_switch kernel/sched/core.c:3453 [inline]
> __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
> schedule+0xd0/0x2a0 kernel/sched/core.c:4253
> schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
> __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
> __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
> ovs_lock net/openvswitch/datapath.c:105 [inline]
> ovs_dp_cmd_new+0x69d/0x1160 net/openvswitch/datapath.c:1690
> genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
> genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
> genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
> netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
> genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
> netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
> netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
> netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
> sock_sendmsg_nosec net/socket.c:651 [inline]
> sock_sendmsg+0xcf/0x120 net/socket.c:671
> ____sys_sendmsg+0x6e8/0x810 net/socket.c:2363
> ___sys_sendmsg+0xf3/0x170 net/socket.c:2417
> __sys_sendmsg+0xe5/0x1b0 net/socket.c:2450
> do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x45c1f9
> Code: Bad RIP value.
> RSP: 002b:00007f864e02dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 000000000002b400 RCX: 000000000045c1f9
> RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
> RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
> R13: 00007ffc8c137ccf R14: 00007f864e02e9c0 R15: 000000000078bf0c
> INFO: task syz-executor.2:9422 blocked for more than 144 seconds.
> Not tainted 5.8.0-rc4-syzkaller #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
> message.
> syz-executor.2 D27040 9422 7005 0x00004004
> Call Trace:
> context_switch kernel/sched/core.c:3453 [inline]
> __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
> schedule+0xd0/0x2a0 kernel/sched/core.c:4253
> schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1873
> do_wait_for_common kernel/sched/completion.c:85 [inline]
> __wait_for_common kernel/sched/completion.c:106 [inline]
> wait_for_common kernel/sched/completion.c:117 [inline]
> wait_for_completion+0x163/0x260 kernel/sched/completion.c:138
> __flush_work+0x51f/0xab0 kernel/workqueue.c:3046
> __cancel_work_timer+0x5de/0x700 kernel/workqueue.c:3133
> ovs_dp_cmd_del+0x18c/0x270 net/openvswitch/datapath.c:1790
> genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
> genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
> genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
> netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
> genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
> netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
> netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
> netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
> sock_sendmsg_nosec net/socket.c:651 [inline]
> sock_sendmsg+0xcf/0x120 net/socket.c:671
> ____sys_sendmsg+0x6e8/0x810 net/socket.c:2363
> ___sys_sendmsg+0xf3/0x170 net/socket.c:2417
> __sys_sendmsg+0xe5/0x1b0 net/socket.c:2450
> do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x45c1f9
> Code: Bad RIP value.
> RSP: 002b:00007f864e00cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 000000000002b400 RCX: 000000000045c1f9
> RDX: 0000000000000000 RSI: 0000000020001980 RDI: 0000000000000004
> RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
> R13: 00007ffc8c137ccf R14: 00007f864e00d9c0 R15: 000000000078bfac
> INFO: task syz-executor.2:9427 blocked for more than 144 seconds.
> Not tainted 5.8.0-rc4-syzkaller #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
> message.
> syz-executor.2 D27688 9427 7005 0x00004004
> Call Trace:
> context_switch kernel/sched/core.c:3453 [inline]
> __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
> schedule+0xd0/0x2a0 kernel/sched/core.c:4253
> schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4312
> __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
> __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
> ovs_lock net/openvswitch/datapath.c:105 [inline]
> ovs_dp_cmd_del+0x4a/0x270 net/openvswitch/datapath.c:1780
> genl_family_rcv_msg_doit net/netlink/genetlink.c:669 [inline]
> genl_family_rcv_msg net/netlink/genetlink.c:714 [inline]
> genl_rcv_msg+0x61d/0x980 net/netlink/genetlink.c:731
> netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
> genl_rcv+0x24/0x40 net/netlink/genetlink.c:742
> netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
> netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
> netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
> sock_sendmsg_nosec net/socket.c:651 [inline]
> sock_sendmsg+0xcf/0x120 net/socket.c:671
> ____sys_sendmsg+0x6e8/0x810 net/socket.c:2363
> ___sys_sendmsg+0xf3/0x170 net/socket.c:2417
> __sys_sendmsg+0xe5/0x1b0 net/socket.c:2450
> do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x45c1f9
> Code: Bad RIP value.
> RSP: 002b:00007f864dfebc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 000000000002b400 RCX: 000000000045c1f9
> RDX: 0000000000000000 RSI: 0000000020001980 RDI: 0000000000000004
> RBP: 000000000078c080 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c
> R13: 00007ffc8c137ccf R14: 00007f864dfec9c0 R15: 000000000078c04c
>
> Showing all locks held in the system:
> 1 lock held by khungtaskd/1147:
> #0: ffffffff89bc0ec0 (rcu_read_lock){....}-{1:2}, at:
> debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
> 1 lock held by in:imklog/6505:
> #0: ffff888095ffe8b0 (&f->f_pos_lock){+.+.}-{3:3}, at:
> __fdget_pos+0xe9/0x100 fs/file.c:826
> 3 locks held by kworker/1:8/10136:
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> set_work_data kernel/workqueue.c:616 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
> #1: ffffc900017f7da8
> ((work_completion)(&(&dp->masks_rebalance)->work)){+.+.}-{0:0}, at:
> process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
> #2: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock
> net/openvswitch/datapath.c:105 [inline]
> #2: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at:
> ovs_dp_masks_rebalance+0x18/0x80 net/openvswitch/datapath.c:2355
> 3 locks held by kworker/0:9/8606:
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> set_work_data kernel/workqueue.c:616 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
> #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at:
> process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
> #1: ffffc90016617da8
> ((work_completion)(&(&dp->masks_rebalance)->work)){+.+.}-{0:0}, at:
> process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
> #2: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock
> net/openvswitch/datapath.c:105 [inline]
> #2: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at:
> ovs_dp_masks_rebalance+0x18/0x80 net/openvswitch/datapath.c:2355
> 2 locks held by syz-executor.2/9414:
> #0: ffffffff8a817810 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40
> net/netlink/genetlink.c:741
> #1: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock
> net/openvswitch/datapath.c:105 [inline]
> #1: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at:
> ovs_dp_cmd_new+0x69d/0x1160 net/openvswitch/datapath.c:1690
> 2 locks held by syz-executor.2/9422:
> #0: ffffffff8a817810 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40
> net/netlink/genetlink.c:741
> #1: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock
> net/openvswitch/datapath.c:105 [inline]
> #1: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at:
> ovs_dp_cmd_del+0x4a/0x270 net/openvswitch/datapath.c:1780
> 2 locks held by syz-executor.2/9427:
> #0: ffffffff8a817810 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40
> net/netlink/genetlink.c:741
> #1: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at: ovs_lock
> net/openvswitch/datapath.c:105 [inline]
> #1: ffffffff8aa5d868 (ovs_mutex){+.+.}-{3:3}, at:
> ovs_dp_cmd_del+0x4a/0x270 net/openvswitch/datapath.c:1780
>
> =============================================
>
> NMI backtrace for cpu 1
> CPU: 1 PID: 1147 Comm: khungtaskd Not tainted 5.8.0-rc4-syzkaller #0
> 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+0x18f/0x20d lib/dump_stack.c:118
> nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
> nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
> trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
> check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
> watchdog+0xd7d/0x1000 kernel/hung_task.c:295
> kthread+0x3b5/0x4a0 kernel/kthread.c:291
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
> Sending NMI from CPU 1 to CPUs 0:
> NMI backtrace for cpu 0
> CPU: 0 PID: 3875 Comm: systemd-journal Not tainted 5.8.0-rc4-syzkaller
> #0
> Hardware name: Google Google Compute Engine/Google Compute Engine,
> BIOS Google 01/01/2011
> RIP: 0033:0x7fad4c407b07
> Code: Bad RIP value.
> RSP: 002b:00007ffef2a78c90 EFLAGS: 00000206
> RAX: 00000000ffffffea RBX: 00005556a5c274b0 RCX: fffffffffffffe00
> RDX: 00000000000001a0 RSI: 0000000000000001 RDI: 00005556a5c274b0
> RBP: 0000000000000000 R08: 00000000000001c0 R09: 00000000ffffffff
> R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff
> R13: 00000000fffffffe R14: 00007ffef2a78f90 R15: 00005556a5c274b0
> FS: 00007fad4c7198c0 GS: 0000000000000000
>
>
> ---
> 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.
> _______________________________________________
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> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
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