linux-kernel - Re: [bug report] regression bisected to "block: Make most scsi_req

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Date:   Mon, 23 Oct 2017 19:47:54 -0600
From:   dann frazier <dann.frazier@...onical.com>
To:     Bart Van Assche <Bart.VanAssche@....com>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>
Subject: Re: [bug report] regression bisected to "block: Make most
 scsi_req_init() calls implicit"

On Mon, Oct 23, 2017 at 3:08 PM, Bart Van Assche <Bart.VanAssche@....com> wrote:
> On Mon, 2017-10-23 at 09:41 -0600, dann frazier wrote:
>> (gdb) list *(sg_io+0x120)
>> 0xffff0000084e71a8 is in sg_io (./include/linux/uaccess.h:113).
>> 108   static inline unsigned long
>> 109   _copy_from_user(void *to, const void __user *from, unsigned long n)
>> 110   {
>> 111           unsigned long res = n;
>> 112           might_fault();
>> 113           if (likely(access_ok(VERIFY_READ, from, n))) {
>> 114                   kasan_check_write(to, n);
>> 115                   res = raw_copy_from_user(to, from, n);
>> 116           }
>> 117           if (unlikely(res))
>
> Hello Dann,
>
> Would it be possible to check whether the patch below is sufficient to fix this?

hey Bart,
 Yes, it does appear to be sufficient:

ubuntu@...ntu:~$ sudo dmesg -c > /dev/null
ubuntu@...ntu:~$ sudo dmraid -r -c
ERROR: isw: seeking device "/dev/vda" to 18446744073708843520
ERROR: sil: seeking device "/dev/vda" to 18446744073709401600
no raid disks
ubuntu@...ntu:~$ dmesg
ubuntu@...ntu:~$

  -dann