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Subject: Re: [PATCH 4.19 000/220] 4.19.86-stable review
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org
Cc:     torvalds@linux-foundation.org, akpm@linux-foundation.org,
        shuah@kernel.org, patches@kernelci.org,
        ben.hutchings@codethink.co.uk, lkft-triage@lists.linaro.org,
        stable@vger.kernel.org
References: <20191122100912.732983531@linuxfoundation.org>
From:   Guenter Roeck <linux@roeck-us.net>
Message-ID: <ae3d804f-594b-80f9-048b-7da45806278c@roeck-us.net>
Date:   Fri, 22 Nov 2019 06:47:05 -0800
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On 11/22/19 2:26 AM, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 4.19.86 release.
> There are 220 patches in this series, all will be posted as a response
> to this one.  If anyone has any issues with these being applied, please
> let me know.
> 
> Responses should be made by Sun, 24 Nov 2019 09:59:19 +0000.
> Anything received after that time might be too late.
> 

I see the following warning (at least for arm64, ppc64, and x86_64).
This seems to be caused by "idr: Fix idr_get_next race with idr_remove".
v4.14.y is also affected. Mainline and v5.3.y are not affected.

Guenter

---
[    3.897800] NetLabel: Initializing
[    3.897944] NetLabel:  domain hash size = 128
[    3.898044] NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO
[    3.898995]
[    3.899135] =============================
[    3.899235] WARNING: suspicious RCU usage
[    3.899479] 4.19.86-rc1+ #1 Not tainted
[    3.899595] -----------------------------
[    3.899772] include/linux/radix-tree.h:241 suspicious rcu_dereference_check() usage!
[    3.899939]
[    3.899939] other info that might help us debug this:
[    3.899939]
[    3.900159]
[    3.900159] rcu_scheduler_active = 2, debug_locks = 1
[    3.900347] 2 locks held by swapper/0/1:
[    3.900479]  #0: (____ptrval____) (cb_lock){+.+.}, at: genl_register_family+0xab/0x717
[    3.901498]  #1: (____ptrval____) (genl_mutex){+.+.}, at: genl_register_family+0xb9/0x717
[    3.901860]
[    3.901860] stack backtrace:
[    3.902136] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.86-rc1+ #1
[    3.902295] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014
[    3.902633] Call Trace:
[    3.902633]  dump_stack+0x71/0xa0
[    3.902633]  idr_get_next+0x133/0x160
[    3.902633]  ? genl_register_family+0xab/0x717
[    3.902633]  ? do_early_param+0x89/0x89
[    3.902633]  genl_family_find_byname+0x4e/0x80
[    3.902633]  genl_register_family+0xc1/0x717
[    3.902633]  ? do_early_param+0x89/0x89
[    3.902633]  ? netlbl_netlink_init+0x21/0x21
[    3.902633]  netlbl_netlink_init+0x5/0x21
[    3.902633]  netlbl_init+0x4a/0x74
[    3.902633]  do_one_initcall+0x58/0x2ae
[    3.902633]  ? do_early_param+0x89/0x89
[    3.902633]  ? rcu_read_lock_sched_held+0x6f/0x80
[    3.902633]  ? do_early_param+0x89/0x89
[    3.902633]  kernel_init_freeable+0x1bc/0x24b
[    3.902633]  ? rest_init+0x176/0x176
[    3.902633]  kernel_init+0x5/0x101
[    3.902633]  ret_from_fork+0x3a/0x50