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Date: Tue, 13 Oct 2020 05:00:18 +0200
From: Mike Galbraith <efault@....de>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: tglx@...utronix.de, linux-rt-users@...r.kernel.org,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RT] 5.9-rt14 softirq_ctrl.lock vs listening_hash[i].lock
lockdep splat
On Mon, 2020-10-12 at 20:34 +0200, Mike Galbraith wrote:
> On Mon, 2020-10-12 at 18:45 +0200, Sebastian Andrzej Siewior wrote:
> > On 2020-10-10 06:31:57 [+0200], Mike Galbraith wrote:
> >
> > so this then. Do you have more of these?
>
> Nope....
Well, I do have a gripe from 5.6-rt, which I just took a moment to
confirm in virgin source, but that kernel is probably EOL.
[ 24.613988] ======================================================
[ 24.613988] WARNING: possible circular locking dependency detected
[ 24.613989] 5.6.19-rt12-rt #3 Tainted: G E
[ 24.613990] ------------------------------------------------------
[ 24.613991] ksoftirqd/0/10 is trying to acquire lock:
[ 24.613992] ffff94a639fd6a48 (&sch->q.lock){+...}, at: sch_direct_xmit+0x81/0x2f0
[ 24.613998]
but task is already holding lock:
[ 24.613998] ffff94a639fd6a80 (&(&sch->running)->seqcount){+...}, at: br_dev_queue_push_xmit+0x79/0x160 [bridge]
[ 24.614007]
which lock already depends on the new lock.
[ 24.614008]
the existing dependency chain (in reverse order) is:
[ 24.614009]
-> #1 (&(&sch->running)->seqcount){+...}:
[ 24.614010] __dev_queue_xmit+0xc86/0xda0
[ 24.614012] br_dev_queue_push_xmit+0x79/0x160 [bridge]
[ 24.614017] br_forward_finish+0x10a/0x1b0 [bridge]
[ 24.614021] __br_forward+0x17d/0x340 [bridge]
[ 24.614024] br_dev_xmit+0x432/0x560 [bridge]
[ 24.614029] dev_hard_start_xmit+0xc5/0x3f0
[ 24.614030] __dev_queue_xmit+0x973/0xda0
[ 24.614031] ip6_finish_output2+0x290/0x980
[ 24.614033] ip6_output+0x6d/0x260
[ 24.614034] mld_sendpack+0x1d9/0x360
[ 24.614035] mld_ifc_timer_expire+0x1f7/0x370
[ 24.614036] call_timer_fn+0x98/0x390
[ 24.614038] run_timer_softirq+0x591/0x720
[ 24.614040] __do_softirq+0xca/0x561
[ 24.614042] run_ksoftirqd+0x45/0x70
[ 24.614043] smpboot_thread_fn+0x266/0x320
[ 24.614045] kthread+0x11c/0x140
[ 24.614047] ret_from_fork+0x24/0x50
[ 24.614049]
-> #0 (&sch->q.lock){+...}:
[ 24.614050] __lock_acquire+0x115a/0x1440
[ 24.614052] lock_acquire+0x93/0x230
[ 24.614053] rt_spin_lock+0x78/0xd0
[ 24.614055] sch_direct_xmit+0x81/0x2f0
[ 24.614056] __dev_queue_xmit+0xcd7/0xda0
[ 24.614057] br_dev_queue_push_xmit+0x79/0x160 [bridge]
[ 24.614062] br_forward_finish+0x10a/0x1b0 [bridge]
[ 24.614067] __br_forward+0x17d/0x340 [bridge]
[ 24.614072] br_dev_xmit+0x432/0x560 [bridge]
[ 24.614076] dev_hard_start_xmit+0xc5/0x3f0
[ 24.614077] __dev_queue_xmit+0x973/0xda0
[ 24.614078] ip6_finish_output2+0x290/0x980
[ 24.614079] ip6_output+0x6d/0x260
[ 24.614080] mld_sendpack+0x1d9/0x360
[ 24.614081] mld_ifc_timer_expire+0x1f7/0x370
[ 24.614082] call_timer_fn+0x98/0x390
[ 24.614084] run_timer_softirq+0x591/0x720
[ 24.614085] __do_softirq+0xca/0x561
[ 24.614086] run_ksoftirqd+0x45/0x70
[ 24.614087] smpboot_thread_fn+0x266/0x320
[ 24.614089] kthread+0x11c/0x140
[ 24.614090] ret_from_fork+0x24/0x50
[ 24.614091]
other info that might help us debug this:
[ 24.614092] Possible unsafe locking scenario:
[ 24.614092] CPU0 CPU1
[ 24.614093] ---- ----
[ 24.614093] lock(&(&sch->running)->seqcount);
[ 24.614094] lock(&sch->q.lock);
[ 24.614095] lock(&(&sch->running)->seqcount);
[ 24.614096] lock(&sch->q.lock);
[ 24.614097]
*** DEADLOCK ***
[ 24.614097] 20 locks held by ksoftirqd/0/10:
[ 24.614098] #0: ffffffffa2485fc0 (rcu_read_lock){....}, at: rt_spin_lock+0x5/0xd0
[ 24.614101] #1: ffff94a65ec1b5a0 (per_cpu_ptr(&bh_lock.lock, cpu)){....}, at: __local_bh_disable_ip+0xda/0x1c0
[ 24.614103] #2: ffffffffa2485fc0 (rcu_read_lock){....}, at: __local_bh_disable_ip+0x106/0x1c0
[ 24.614105] #3: ffffffffa2485fc0 (rcu_read_lock){....}, at: rt_spin_lock+0x5/0xd0
[ 24.614107] #4: ffff94a65ec1c1e0 (&base->expiry_lock){+...}, at: run_timer_softirq+0x3e3/0x720
[ 24.614110] #5: ffffb3bd40077d70 ((&idev->mc_ifc_timer)){+...}, at: call_timer_fn+0x5/0x390
[ 24.614113] #6: ffffffffa2485fc0 (rcu_read_lock){....}, at: mld_sendpack+0x5/0x360
[ 24.614116] #7: ffffffffa2485fc0 (rcu_read_lock){....}, at: __local_bh_disable_ip+0x106/0x1c0
[ 24.614118] #8: ffffffffa2485fa0 (rcu_read_lock_bh){....}, at: ip6_finish_output2+0x7a/0x980
[ 24.614121] #9: ffffffffa2485fc0 (rcu_read_lock){....}, at: __local_bh_disable_ip+0x106/0x1c0
[ 24.614124] #10: ffffffffa2485fa0 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x63/0xda0
[ 24.614126] #11: ffffffffa2485fc0 (rcu_read_lock){....}, at: br_dev_xmit+0x5/0x560 [bridge]
[ 24.614133] #12: ffffffffa2485fc0 (rcu_read_lock){....}, at: __local_bh_disable_ip+0x106/0x1c0
[ 24.614135] #13: ffffffffa2485fa0 (rcu_read_lock_bh){....}, at: __dev_queue_xmit+0x63/0xda0
[ 24.614138] #14: ffffffffa2485fc0 (rcu_read_lock){....}, at: rt_spin_lock+0x5/0xd0
[ 24.614140] #15: ffff94a639fd6d60 (&dev->qdisc_tx_busylock_key){+...}, at: __dev_queue_xmit+0x89e/0xda0
[ 24.614143] #16: ffffffffa2485fc0 (rcu_read_lock){....}, at: rt_spin_lock+0x5/0xd0
[ 24.614145] #17: ffff94a639fd6b40 (&dev->qdisc_running_key){+...}, at: __dev_queue_xmit+0xc52/0xda0
[ 24.614148] #18: ffff94a639fd6a80 (&(&sch->running)->seqcount){+...}, at: br_dev_queue_push_xmit+0x79/0x160 [bridge]
[ 24.614154] #19: ffffffffa2485fc0 (rcu_read_lock){....}, at: rt_spin_lock+0x5/0xd0
[ 24.614155]
stack backtrace:
[ 24.614156] CPU: 0 PID: 10 Comm: ksoftirqd/0 Kdump: loaded Tainted: G E 5.6.19-rt12-rt #3
[ 24.614157] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.20C 09/23/2013
[ 24.614158] Call Trace:
[ 24.614160] dump_stack+0x71/0x9b
[ 24.614163] check_noncircular+0x155/0x170
[ 24.614166] ? __lock_acquire+0x115a/0x1440
[ 24.614168] __lock_acquire+0x115a/0x1440
[ 24.614172] lock_acquire+0x93/0x230
[ 24.614173] ? sch_direct_xmit+0x81/0x2f0
[ 24.614177] rt_spin_lock+0x78/0xd0
[ 24.614178] ? sch_direct_xmit+0x81/0x2f0
[ 24.614180] sch_direct_xmit+0x81/0x2f0
[ 24.614182] __dev_queue_xmit+0xcd7/0xda0
[ 24.614184] ? find_held_lock+0x2d/0x90
[ 24.614186] ? br_forward_finish+0xde/0x1b0 [bridge]
[ 24.614192] ? br_dev_queue_push_xmit+0x79/0x160 [bridge]
[ 24.614197] br_dev_queue_push_xmit+0x79/0x160 [bridge]
[ 24.614203] br_forward_finish+0x10a/0x1b0 [bridge]
[ 24.614210] __br_forward+0x17d/0x340 [bridge]
[ 24.614216] ? br_flood+0x98/0x120 [bridge]
[ 24.614222] br_dev_xmit+0x432/0x560 [bridge]
[ 24.614228] dev_hard_start_xmit+0xc5/0x3f0
[ 24.614232] __dev_queue_xmit+0x973/0xda0
[ 24.614233] ? mark_held_locks+0x2d/0x80
[ 24.614235] ? eth_header+0x25/0xc0
[ 24.614238] ? ip6_finish_output2+0x290/0x980
[ 24.614239] ip6_finish_output2+0x290/0x980
[ 24.614242] ? ip6_mtu+0x135/0x1b0
[ 24.614246] ? ip6_output+0x6d/0x260
[ 24.614247] ip6_output+0x6d/0x260
[ 24.614249] ? __ip6_finish_output+0x210/0x210
[ 24.614252] mld_sendpack+0x1d9/0x360
[ 24.614255] ? mld_ifc_timer_expire+0x119/0x370
[ 24.614256] mld_ifc_timer_expire+0x1f7/0x370
[ 24.614258] ? mld_dad_timer_expire+0xb0/0xb0
[ 24.614259] ? mld_dad_timer_expire+0xb0/0xb0
[ 24.614260] call_timer_fn+0x98/0x390
[ 24.614263] ? mld_dad_timer_expire+0xb0/0xb0
[ 24.614264] run_timer_softirq+0x591/0x720
[ 24.614267] __do_softirq+0xca/0x561
[ 24.614271] ? smpboot_thread_fn+0x28/0x320
[ 24.614273] ? smpboot_thread_fn+0x70/0x320
[ 24.614274] run_ksoftirqd+0x45/0x70
[ 24.614275] smpboot_thread_fn+0x266/0x320
[ 24.614277] ? smpboot_register_percpu_thread+0xe0/0xe0
[ 24.614278] kthread+0x11c/0x140
[ 24.614280] ? kthread_park+0x90/0x90
[ 24.614282] ret_from_fork+0x24/0x50
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