linux-kernel - Re: [PATCH] libsas: flush pending destruct work in sas_unregister_domain

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Message-ID: <CAM_iQpV-uy9VXfVx9s5AX8TN5-0G=7Ny0uvmCCn7V7ys_gBbWw@mail.gmail.com>
Date:   Tue, 28 Nov 2017 09:00:54 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Praveen Murali <pmurali@...icube.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH] libsas: flush pending destruct work in sas_unregister_domain_devices()

On Tue, Nov 28, 2017 at 12:20 AM, Johannes Thumshirn <jthumshirn@...e.de> wrote:
> On Mon, Nov 27, 2017 at 04:24:45PM -0800, Cong Wang wrote:
>> We saw dozens of the following kernel waring:
>>
>>  WARNING: CPU: 0 PID: 705 at fs/sysfs/group.c:224 sysfs_remove_group+0x54/0x88()
>>  sysfs group ffffffff81ab7670 not found for kobject '6:0:3:0'
>>  Modules linked in: cpufreq_ondemand x86_pkg_temp_thermal coretemp kvm_intel kvm microcode raid0 iTCO_wdt iTCO_vendor_support sb_edac edac_core lpc_ich mfd_core ioatdma i2c_i801 shpchp wmi hed acpi_cpufreq lp parport tcp_diag inet_diag ipmi_si ipmi_devintf ipmi_msghandler sch_fq_codel igb ptp pps_core i2c_algo_bit i2c_core crc32c_intel isci libsas scsi_transport_sas dca ipv6
>>  CPU: 0 PID: 705 Comm: kworker/u240:0 Not tainted 4.1.35.el7.x86_64 #1
>
> This should by now be fixed with commit fbce4d97fd43 ("scsi: fixup kernel
> warning during rmmod()" which went into v4.14-rc6.

I don't see the full backtrace in commit fbce4d97fd43, but it is probably
not rmmod path in our case.