[Bug 60758] New: module scsi_wait_scan not found kernel panic on boot

[Bug 60758] New: module scsi_wait_scan not found kernel panic on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=60758

            Bug ID: 60758
           Summary: module scsi_wait_scan not found kernel panic on boot
           Product: IO/Storage
           Version: 2.5
    Kernel Version: 3.10.6
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: SCSI
          Assignee: linux-scsi@vger.kernel.org
          Reporter: zakrzewskim@wp.pl
        Regression: No

Created attachment 107218
  --> https://bugzilla.kernel.org/attachment.cgi?id=107218&action=edit
Kernel panic screenshot

After upgrading kernel 3.10.4-1 to 3.10.5-1 or 3.10.6-1 the system is refusing
to boot with "module scsi_wait_scan not found" long error message. Then comes
kernel panic.

I'm on CentOS 6.4 64-bit.

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #1 from zakrzewskim@wp.pl ---
My /etc/fstab:

timeout 5
default 0

title CentOS (3.10.6-1.el6.elrepo.x86_64)
root (hd0,1)
kernel /vmlinuz-3.10.6-1.el6.elrepo.x86_64 ro root=/dev/md2 rd_NO_LUKS rd_NO_DM
nomodeset crashkernel=auto SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
KEYTABLE=de
initrd /initramfs-3.10.6-1.el6.elrepo.x86_64.img

title CentOS (3.10.4-1.el6.elrepo.x86_64)
root (hd0,1)
kernel /vmlinuz-3.10.4-1.el6.elrepo.x86_64 ro root=/dev/md2 rd_NO_LUKS rd_NO_DM
nomodeset crashkernel=auto SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
KEYTABLE=de
initrd /initramfs-3.10.4-1.el6.elrepo.x86_64.img

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #2 from zakrzewskim@wp.pl ---
Sorry that was my grub.conf.

Here's fstab:

proc /proc proc defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
tmpfs /dev/shm tmpfs defaults 0 0
sysfs /sys sysfs defaults 0 0
/dev/md0 none           swap  sw                                               
                                                              0       0
/dev/md1 /boot          ext4  defaults                                         
             0       1
/dev/md2 /              ext4 
rw,discard,noatime,nodiratime,usrjquota=aquota.user,grpjquota=aquota.group,usrquota,grpquota,jqfmt=vfsv0
       0       1
/dev/md3 /var/lib/mysql ext4 
rw,discard,noatime,nodiratime,usrjquota=aquota.user,grpjquota=aquota.group,usrquota,grpquota,jqfmt=vfsv0
       0       0
/dev/md4 /home          ext4 
rw,noatime,nodiratime,usrjquota=aquota.user,grpjquota=aquota.group,usrquota,grpquota,jqfmt=vfsv0
               0       0

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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Jeff Zhou <jz.researcher@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jz.researcher@yahoo.com

--- Comment #3 from Jeff Zhou <jz.researcher@yahoo.com> ---
Looks like a dependency failure, would you like to show the two .config files?

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #4 from zakrzewskim@wp.pl ---
Here you are:
http://www.upemax.user.icpnet.pl/config-3.10.9-1.el6.elrepo.x86_64

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #5 from Jeff Zhou <jz.researcher@yahoo.com> ---
If your system fails by "module scsi_wait_scan not found", then it could be the
init script issue in your CentOS box.

The last kernel with scsi_wait_scan.ko is v3.5.7, it has been removed ever
since v3.6. Any init script for 3.10 should not use that module.


Another point is in your config, the CONFIG_SCSI_SCAN_ASYNC is not set, try to
turn it into Y and see what's happening.

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--- Comment #6 from Jeff Zhou <jz.researcher@yahoo.com> ---
There are some discussions about this removal in history:

http://www.mail-archive.com/initramfs@vger.kernel.org/msg02645.html

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--- Comment #7 from Alan Bartlett <ajb@elrepo.org> ---
(In reply to Jeff Zhou from comment #5)
> If your system fails by "module scsi_wait_scan not found", then it could be
> the init script issue in your CentOS box.
> 
> The last kernel with scsi_wait_scan.ko is v3.5.7, it has been removed ever
> since v3.6. Any init script for 3.10 should not use that module.
> 
> 
> Another point is in your config, the CONFIG_SCSI_SCAN_ASYNC is not set, try
> to turn it into Y and see what's happening.

Jeff, 

For the fuller picture please see --

http://elrepo.org/bugs/view.php?id=401

This non-booting issue only occurs with one system. The reporter has other
systems which do boot correctly using the same kernel(s).

As was explained in the referenced bug report (note 3235), the mention of
"module scsi_wait_scan not found" is a red-herring.

Note the following section from the 3.10.10 drivers/scsi/Kconfig file --

[quote]
config SCSI_SCAN_ASYNC
        bool "Asynchronous SCSI scanning"
        depends on SCSI
        help
          The SCSI subsystem can probe for devices while the rest of the
          system continues booting, and even probe devices on different
          busses in parallel, leading to a significant speed-up.

          If you have built SCSI as modules, enabling this option can
          be a problem as the devices may not have been found by the
          time your system expects them to have been.  You can load the
          scsi_wait_scan module to ensure that all scans have completed.
          If you build your SCSI drivers into the kernel, then everything
          will work fine if you say Y here.

          You can override this choice by specifying "scsi_mod.scan=sync"
          or async on the kernel's command line.
[/quote]

It still makes a reference to the scsi_wait_scan module and advises against
setting SCSI_SCAN_ASYNC=y when scsi drivers have been built as modules.

It is unnecessary to build a new kernel to test, as per your last point. Just
appending "scsi_mod.scan=async" to the kernel boot line will be sufficient.

Perhaps the reporter will test with that and then report back?

Alan / burakkucat.

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--- Comment #8 from zakrzewskim@wp.pl ---
Yes, I can test ;)

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--- Comment #9 from zakrzewskim@wp.pl ---
I will booting with these options:

timeout 0
default 0

title CentOS (3.10.10-1.el6.elrepo.x86_64)
root (hd0,1)
kernel /vmlinuz-3.10.10-1.el6.elrepo.x86_64 ro root=/dev/md2 rd_NO_LUKS
rd_NO_DM nomodeset crashkernel=auto SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
KEYTABLE=de scsi_mod.scan=sync
initrd /initramfs-3.10.10-1.el6.elrepo.x86_64.img

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--- Comment #10 from zakrzewskim@wp.pl ---
Made a mistake, so once again:

timeout 0
default 0

title CentOS (3.10.10-1.el6.elrepo.x86_64)
root (hd0,1)
kernel /vmlinuz-3.10.10-1.el6.elrepo.x86_64 ro root=/dev/md2 rd_NO_LUKS
rd_NO_DM nomodeset crashkernel=auto SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
KEYTABLE=de scsi_mod.scan=async
initrd /initramfs-3.10.10-1.el6.elrepo.x86_64.img

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--- Comment #11 from Jeff Zhou <jz.researcher@yahoo.com> ---
Thanks. I am a bit curious about the description in Kconfig,
since the scsi_wait_scan.ko was built from scsi_wait_scan.c, which was removed
in v.3.6.
How to refer a non-exist module, as described in the section of "config
SCSI_SCAN_ASYNC"

>From v.3.5.7 to v.3.6.1, there is a change in source code, but it seems the
documentation in Kconfig has not been updated.




(In reply to Alan Bartlett from comment #7)
> (In reply to Jeff Zhou from comment #5)
> > If your system fails by "module scsi_wait_scan not found", then it could be
> > the init script issue in your CentOS box.
> > 
> > The last kernel with scsi_wait_scan.ko is v3.5.7, it has been removed ever
> > since v3.6. Any init script for 3.10 should not use that module.
> > 
> > 
> > Another point is in your config, the CONFIG_SCSI_SCAN_ASYNC is not set, try
> > to turn it into Y and see what's happening.
> 
> Jeff, 
> 
> For the fuller picture please see --
> 
> http://elrepo.org/bugs/view.php?id=401
> 
> This non-booting issue only occurs with one system. The reporter has other
> systems which do boot correctly using the same kernel(s).
> 
> As was explained in the referenced bug report (note 3235), the mention of
> "module scsi_wait_scan not found" is a red-herring.
> 
> Note the following section from the 3.10.10 drivers/scsi/Kconfig file --
> 
> [quote]
> config SCSI_SCAN_ASYNC
>         bool "Asynchronous SCSI scanning"
>         depends on SCSI
>         help
>           The SCSI subsystem can probe for devices while the rest of the
>           system continues booting, and even probe devices on different
>           busses in parallel, leading to a significant speed-up.
> 
>           If you have built SCSI as modules, enabling this option can
>           be a problem as the devices may not have been found by the
>           time your system expects them to have been.  You can load the
>           scsi_wait_scan module to ensure that all scans have completed.
>           If you build your SCSI drivers into the kernel, then everything
>           will work fine if you say Y here.
> 
>           You can override this choice by specifying "scsi_mod.scan=sync"
>           or async on the kernel's command line.
> [/quote]
> 
> It still makes a reference to the scsi_wait_scan module and advises against
> setting SCSI_SCAN_ASYNC=y when scsi drivers have been built as modules.
> 
> It is unnecessary to build a new kernel to test, as per your last point.
> Just appending "scsi_mod.scan=async" to the kernel boot line will be
> sufficient.
> 
> Perhaps the reporter will test with that and then report back?
> 
> Alan / burakkucat.

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--- Comment #12 from Jeff Zhou <jz.researcher@yahoo.com> ---
(In reply to zakrzewskim from comment #10)
> Made a mistake, so once again:
> 
> timeout 0
> default 0
> 
> title CentOS (3.10.10-1.el6.elrepo.x86_64)
> root (hd0,1)
> kernel /vmlinuz-3.10.10-1.el6.elrepo.x86_64 ro root=/dev/md2 rd_NO_LUKS
> rd_NO_DM nomodeset crashkernel=auto SYSFONT=latarcyrheb-sun16
> LANG=en_US.UTF-8 KEYTABLE=de scsi_mod.scan=async
> initrd /initramfs-3.10.10-1.el6.elrepo.x86_64.img

In thread
http://elrepo.org/bugs/view.php?id=401

says 3.10.4-1 boots fine, would you run lsinitramfs to see if scsi_scan_wait
module is there? From changelog 3.10.4 to 3.10.5, I did not see any
modifications to that.

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--- Comment #13 from zakrzewskim@wp.pl ---
lsinitramfs
-bash: lsinitramfs: command not found

What do I need to install ?

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--- Comment #14 from zakrzewskim@wp.pl ---
The server does not boot with kernel 3.10.10-1.el6.elrepo.x86_64 :/

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--- Comment #15 from Akemi Yagi <toracat@elrepo.org> ---
(In reply to zakrzewskim from comment #13)
> lsinitramfs
> -bash: lsinitramfs: command not found
> 
> What do I need to install ?

You can use lsinitrd that is included in the dracut package.

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--- Comment #16 from Alan Bartlett <ajb@elrepo.org> ---
For completeness (so that we cover 'every angle') I have built a version of our
kernel-ml-3.10.10 package (64-bit) with CONFIG_SCSI_SCAN_ASYNC=y, as Jeff has
suggested. It is available to download from --

http://elrepo.org/people/ajb/tmp/

However I do not expect that will make any difference.

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--- Comment #17 from zakrzewskim@wp.pl ---
It doesn't work too. I don't know what's wrong. Only 3.10.4-1 works fine and I
need to stick with it :/

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--- Comment #18 from Jeff Zhou <jz.researcher@yahoo.com> ---
(In reply to zakrzewskim from comment #17)
> It doesn't work too. I don't know what's wrong. Only 3.10.4-1 works fine and
> I need to stick with it :/

[1] May I know, do you have separate directories for each version of kernel
source during building/installation, or unpack different versions of kernel
source to the same folder to save some space while upgrading?

[2] Would you like to show a more complete booting log?

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--- Comment #19 from zakrzewskim@wp.pl ---
1. All of them are separate. I just install kernel-ml via yum.

2. I can only show such log from kernel 3.10.4-1. I don't have KVM to see
what's going on. Since this is a production machine inside datacenter I can
only rent KVM for 2 hours.

3. I found another bug - server is freezing and load is getting higher than
100: 

BUG: unable to handle kernel paging request at 0000010600000032
IP: [<ffffffff811dcb85>] SyS_epoll_ctl+0x145/0x420
PGD 0
Oops: 0000 [#1] SMP
Modules linked in: nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack
xt_iprange iptable_filter ip_tables netconsole configfs nct6775 hwmon_vid ipv6
cpufreq_ondemand ppdev iTCO_wdt iTCO_vendor_support shpchp coretemp hwmon
acpi_cpufreq freq_table mperf kvm_intel kvm crc32_pclmul crc32c_intel
ghash_clmulni_intel aesni_intel ablk_helper cryptd lrw gf128mul glue_helper
aes_x86_64 microcode pcspkr i2c_i801 parport_pc parport r8169 mii sg lpc_ich
xhci_hcd snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hwdep snd_seq
snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc ext4 jbd2 mbcache
raid1 sd_mod crc_t10dif mxm_wmi video ahci libahci wmi dm_mirror dm_region_hash
dm_log dm_mod
CPU: 0 PID: 3133 Comm: nginx Not tainted 3.10.4-1.el6.elrepo.x86_64 #1
Hardware name: MSI MS-7816/H87-G43 (MS-7816), BIOS V2.3 06/07/2013
task: ffff8807f18c0ac0 ti: ffff880753374000 task.ti: ffff880753374000
RIP: 0010:[<ffffffff811dcb85>]  [<ffffffff811dcb85>] SyS_epoll_ctl+0x145/0x420
RSP: 0018:ffff880753375f18  EFLAGS: 00010202
RAX: 0000010600000002 RBX: ffff8807f23125c0 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffff880650213bc0 RDI: ffff88076704b808
RBP: ffff880753375f78 R08: 0000000000000002 R09: 0101010101010101
R10: 00007fff52ea2220 R11: 0000000000000202 R12: ffff880773f15c80
R13: 0000000000000001 R14: 0000000000000045 R15: ffff88076704b800
FS:  00007f8451c707c0(0000) GS:ffff88081ea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000010600000032 CR3: 0000000771b3b000 CR4: 00000000001407f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8807f445c648 0000000152ea22b0 ffff88076704b808 fffffff7810dfe46
 11b8144080000001 ffff880700000000 0000000001838b20 0000000000000001
 0000000011b81440 0000000011bd9288 0000000011b6f8c0 00007fff52ea22b0
Call Trace:
 [<ffffffff815fd319>] system_call_fastpath+0x16/0x1b
Code: 00 00 c7 45 ac 00 00 00 00 83 f8 01 0f 86 4d 01 00 00 49 8d 47 08 48 89
c7 48 89 45 b0 e8 44 4c 41 00 49 8b 47 70 48 85 c0 74 1f <48> 3b 58 30 48 89 c6
77 0d 72 68 44 89 f2 2b 50 38 83 fa 00 7e
RIP  [<ffffffff811dcb85>] SyS_epoll_ctl+0x145/0x420
 RSP <ffff880753375f18>
CR2: 0000010600000032
---[ end trace 3c47cb214b7f3743 ]---

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--- Comment #20 from Jeff Zhou <jz.researcher@yahoo.com> ---
Yes, there could be extra bugs.

Since this bug is about "scsi_wait_scan not found" in v3.10.5 and above, we can
try to work on this one first.

As suggested by Alan, the lsinitrd is available, it can be used to list out the
modules of a initramfs file.
Would you like to run lsinitrd for a working version (v.3.10.4-1) and the first
version with issue (v.3.10.5-1) to show the modules in the initramfs file?

lsinitrd initrd_v.xxx.img > v.xxx.lst

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--- Comment #21 from zakrzewskim@wp.pl ---
Here you are: http://www.upemax.user.icpnet.pl/3.10.4-1.el6.lst

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--- Comment #22 from Jeff Zhou <jz.researcher@yahoo.com> ---
(In reply to zakrzewskim from comment #21)
> Here you are: http://www.upemax.user.icpnet.pl/3.10.4-1.el6.lst

Yes then we see the scsi_scan_wait is not in 3.10.4 either, otherwise there
will be a line :"drivers/scsi/scsi_wait_scan.ko".

The rc.sysinit file in your system might need adjustment to remove the
reference to scsi_wait_scan module.

But that might not be the root cause, since 3.10.4 without scsi_wait_scan works
fine under this script.

There could be a regression between 3.10.4 to 3.10.5 cause your system hang,
might be or might not be scsi problem.

To find the root cause and fix it, probably need to roll back between 3.10.5 to
3.10.4, build and test the kernel for booting, git bisect could be helpful.
Then we can check the details to see why the commit crashing the specific
machine.

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--- Comment #23 from zakrzewskim@wp.pl ---
Ok. Thank you.

Maybe you need to get such board - H87-G43 to test it ?

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--- Comment #24 from Alan Bartlett <ajb@elrepo.org> ---
(1) I have critically examined the configuration files used (from 3.10 to
3.10.10) paying particular attention to 3.10.4 v 3.10.5

There is nothing untoward in the configuration that can account for this
problem.

(2) I have performed a diff (diff -Npru) between the sources of 3.10.4 and
3.10.5

Subsequent checking the output for scsi references does not show anything
obvious, to me. The output is attached, as the file diff-3.10.4-to-3.10.5.txt

(3) Grep'ing the standard RHEL 6 /etc/rc.d/rc.sysinit file shows something
interesting on line 165 but, once again, I do not think it is relevant.

[quote]
[Duo2 ~]$ grep -n -C 10 scsi /etc/rc.d/rc.sysinit
155-# Configure kernel parameters
156-update_boot_stage RCkernelparam
157-apply_sysctl
158-
159-# Set the hostname.
160-update_boot_stage RChostname
161-action $"Setting hostname ${HOSTNAME}: " hostname ${HOSTNAME}
162-[ -n "${NISDOMAIN}" ] && domainname ${NISDOMAIN}
163-
164-# Sync waiting for storage.
165:{ rmmod scsi_wait_scan ; modprobe scsi_wait_scan ; rmmod scsi_wait_scan ; }
>/dev/null 2>&1
166-
167-# Device mapper & related initialization
168-if ! __fgrep "device-mapper" /proc/devices >/dev/null 2>&1 ; then
169-       modprobe dm-mod >/dev/null 2>&1
170-fi
171-
172-if [ -f /etc/crypttab ]; then
173-    init_crypto 0
174-fi
175-
[/quote]

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--- Comment #25 from Alan Bartlett <ajb@elrepo.org> ---
Created attachment 107395
  --> https://bugzilla.kernel.org/attachment.cgi?id=107395&action=edit
diff -Npru linux-3.10.4 linux-3.10.5

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #26 from Jeff Zhou <jz.researcher@yahoo.com> ---
(In reply to zakrzewskim from comment #23)
> Ok. Thank you.
> 
> Maybe you need to get such board - H87-G43 to test it ?

I would like to help if get such board.

For this H87-G43 board, some report also shows booting issue with Linux
recently:
https://forum-en.msi.com/index.php?topic=170643.0

There are lots of checkins for ACPI and DRM driver in 3.10.5,
https://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.10.5

If own the machine, it would be much easier to revert the checkins to see
what's going on.

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--- Comment #27 from zakrzewskim@wp.pl ---
Hetzner is using these boards inside their EX40 or EX40-SSD dedicated servers:

http://wiki.hetzner.de/index.php/Wake_On_LAN/en

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--- Comment #28 from zakrzewskim@wp.pl ---
One more thing - these boards does not boot kernel-lt-3.0.94-1 and latest
official CentOS kernel too !

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--- Comment #29 from zakrzewskim@wp.pl ---
kernel 3.1.11-2 does not boot too :/

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--- Comment #30 from zakrzewskim@wp.pl ---
(In reply to Alan Bartlett from comment #24)
> (3) Grep'ing the standard RHEL 6 /etc/rc.d/rc.sysinit file shows something
> interesting on line 165 but, once again, I do not think it is relevant.

Nice find. I will try booting with this line commented ;)

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--- Comment #31 from zakrzewskim@wp.pl ---
Standard CentOS 6 kernel got such module:

/lib/modules/2.6.32-358.18.1.el6.x86_64/kernel/drivers/scsi/scsi_wait_scan.ko
/lib/modules/2.6.32-358.el6.x86_64/kernel/drivers/scsi/scsi_wait_scan.ko

That's why it's referring to it.

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--- Comment #32 from zakrzewskim@wp.pl ---
It seems I'm not the only one with this problem:
http://www.gossamer-threads.com/lists/linux/kernel/1747344

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--- Comment #33 from zakrzewskim@wp.pl ---
Maybe this will help:

lspci
00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller
(rev 06)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen
Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor
HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB xHCI (rev 04)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series
Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB EHCI #2 (rev 04)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI
Express Root Port #1 (rev d4)
00:1c.1 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI
Express Root Port #2 (rev d4)
00:1c.3 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d4)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation H87 Express Chipset LPC Controller (rev
04)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family
6-port SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus
Controller (rev 04)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI
Express Gigabit Ethernet controller (rev 06)
03:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge
(rev 03)

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--- Comment #34 from zakrzewskim@wp.pl ---
Tested again. Here are the results:

http://files.tinypic.pl/i/00449/clv7pa58vgxk.jpg
http://files.tinypic.pl/i/00449/nawfo9bwhyn8.jpg

Please help the current kernel is just unstable !

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zakrzewskim@wp.pl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|3.10.6                      |3.10.5-3.11.1

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--- Comment #35 from zakrzewskim@wp.pl ---
Please note that was with:

#{ rmmod scsi_wait_scan ; modprobe scsi_wait_scan ; rmmod scsi_wait_scan ; }
>/dev/null 2>&1

and

title CentOS (3.11.1-2.el6.elrepo.x86_64)
root (hd0,1)
kernel /vmlinuz-3.11.1-2.el6.elrepo.x86_64 ro root=/dev/md2 rd_NO_LUKS rd_NO_DM
nomodeset crashkernel=auto SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8
KEYTABLE=de scsi_mod.scan=async
initrd /initramfs-3.11.1-2.el6.elrepo.x86_64.img

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--- Comment #36 from Alan Bartlett <ajb@elrepo.org> ---
(In reply to zakrzewskim from comment #34)
> Tested again. Here are the results:
> 
> http://files.tinypic.pl/i/00449/clv7pa58vgxk.jpg
> http://files.tinypic.pl/i/00449/nawfo9bwhyn8.jpg
> 
> Please help the current kernel is just unstable !

In the second of the images, above, there is a suggestion to add "rdshell" to
the kernel command line. 

Have you tried it? 

Perhaps it will allow you to gather some more information about the problem,
which might assist Jeff's investigations.

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--- Comment #37 from zakrzewskim@wp.pl ---
I forgot to add it. I will try again soon.

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newbie <kernel.tw@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kernel.tw@gmail.com

--- Comment #38 from newbie <kernel.tw@gmail.com> ---
Hi:

　I had the same problem with 3.10.16 on CentOS 6.4 x86_64 too...
I don't know it's my wrong when I make config, or other people too?

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #39 from newbie <kernel.tw@gmail.com> ---
I reinstall my system and install a new kernel rpm with 3.17, seems fine,
I think it might be my wrong with some operation.

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--- Comment #40 from newbie <kernel.tw@gmail.com> ---
　I check my boot.log on CentOS 6.4 x86_64 with 3.10.17 today,
seem

    FATAL: Module scsi_wait_scan not found

still appear, but can boot in to the system at least.

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #41 from zakrzewskim@wp.pl ---
Please test (In reply to newbie from comment #40)
> 　I check my boot.log on CentOS 6.4 x86_64 with 3.10.17 today,
> seem
> 
>     FATAL: Module scsi_wait_scan not found
> 
> still appear, but can boot in to the system at least.

Please test kernel 3.11.6 too.

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #42 from newbie <kernel.tw@gmail.com> ---
(In reply to zakrzewskim from comment #41)
> Please test (In reply to newbie from comment #40)
> > 　I check my boot.log on CentOS 6.4 x86_64 with 3.10.17 today,
> > seem
> > 
> >     FATAL: Module scsi_wait_scan not found
> > 
> > still appear, but can boot in to the system at least.
> 
> Please test kernel 3.11.6 too.

I'd solve other problem with my 3.10.17 config now ...

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #43 from newbie <kernel.tw@gmail.com> ---
3.10.18 still show one line

　FATAL: Module scsi_wait_scan not found

but boot ok.

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #44 from Alan Bartlett <ajb@elrepo.org> ---
(In reply to newbie from comment #43)
> 3.10.18 still show one line
> 
> 　FATAL: Module scsi_wait_scan not found
> 
> but boot ok.

That is not a message output by the kernel but is the result of line number 165
in the "userland" file, /etc/rc.d/rc.sysinit, of RHEL 6 (and its clones).

If you do not like seeing the message, just "comment out" line number 165 in
your /etc/rc.d/rc.sysinit file.

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #45 from newbie <kernel.tw@gmail.com> ---
> If you do not like seeing the message,
> just "comment out" line number 165 in your /etc/rc.d/rc.sysinit file.

seems no help, that message still exist, I don't know why.
but really problem is:

I use two SATA 200G(sda/sdb) build a soft RAID1 (md)
three days ago, one disk error and off,
but I just discovered today,
after I mdadm add fix it then reboot,
the bad disk show read error constantly,
I can't use normally,so I use the other good one boot, then...

 FATAL: Module scsi_wait_scan not found

then...

message loop~

I use 3.10.17, 3.10.18, the same situation,I can't boot into system,
so finally,I boot with CentOS 2.6 kernel into the system save data,
then shutdown now... ><

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--- Comment #46 from zakrzewskim@wp.pl ---
What about kernel 3.12 ?

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--- Comment #47 from zakrzewskim@wp.pl ---
3.12 doesn't boot too. The same reason...

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Vincent Li <vincent.mc.li@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vincent.mc.li@gmail.com

--- Comment #48 from Vincent Li <vincent.mc.li@gmail.com> ---
oddly, I can boot into 3.12.0-rc4 but not 3.13.0-rc3, neither of them has
scsi_wait_scan.ko compiled. I see error message "FATAL: Module scsi_wait_scan
not found" for both 3.12.0-rc4 and 3.13.0-rc3. but it only appears once for
3.12.0-rc4. it repeated many times for 3.13.0-rc3 and finally kernel Panic:

FATAL: Module scsi_wait_scan not found.
FATAL: Module scsi_wait_scan not found.
FATAL: Module scsi_wait_scan not found.
FATAL: Module scsi_wait_scan not found.

Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100

CPU: 3 PID: 1 Comm: init Tainted: GF            3.13.0-rc3 #27
Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2007
 0000000000000001 ffff8802108f3d98 ffffffff8156c50b 000000000000fffe
 ffffffff817e0d00 ffff8802108f3e18 ffffffff8156c298 ffffffff00000010
 ffff8802108f3e28 ffff8802108f3dc8 ffff8802108f17b8 ffff8802108f3dd8
Call Trace:
 [<ffffffff8156c50b>] dump_stack+0x49/0x5e
 [<ffffffff8156c298>] panic+0xbb/0x1d5
 [<ffffffff8104e74b>] find_new_reaper+0x17b/0x180
 [<ffffffff8104f8d5>] forget_original_parent+0x45/0x1c0
 [<ffffffff8111e110>] ? perf_cgroup_switch+0x180/0x180
 [<ffffffff8104fa67>] exit_notify+0x17/0x130
 [<ffffffff8104fd6e>] do_exit+0x1ee/0x480
 [<ffffffff81050051>] do_group_exit+0x51/0xc0
 [<ffffffff810500d7>] SyS_exit_group+0x17/0x20
 [<ffffffff81578dd2>] system_call_fastpath+0x16/0x1b

I tried comment out the scsi_wait_scan in rc.sysinit and kernel boot parameter
with 'scsi_mod.scan=async', no help

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--- Comment #49 from zakrzewskim@wp.pl ---
Can someone test it on H87-G43 board ?

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Lin Feng <linf@chinanetcenter.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |linf@chinanetcenter.com

--- Comment #50 from Lin Feng <linf@chinanetcenter.com> ---
Hi all,

I got exactly the same problem on a CentOS 6.4 64bit kvm guest. That's while
trying to update my kenrel to mainline 3.13-rc5 console repeat writing "FATAL:
Module scsi_wait_scan not found." and finally panic. The whole output graph is
maily same as pasted by Vincent Li.

After tracking this bugzilla I get the thought that the dracut mismatch with
the kernel. Since kerne 3.6 and following have dropped scsi_wait_scan module
but CentOS6.4's dracut is hardcoded to add the instruction "modeprobe
scsi_wait_scan" into /init script in initramfs image.

So I tried following approaches for confirmation:
1. Update kernel to 3.5(it still holds the scsi_wait_scan module): it boots
find.
2. Update the dracut to the latest version in git tree, since it has removed
the redundant "modeprobe scsi_wait_scan" for building 3.6 and later kernels but
it doesn't work, telling me that could not find root device like pasted in
step3.
3. Decompress the initramfs and modify the /init script by removing the line
"modeprobe scsi_wait_scan" but it doesn't work neither:
(snips)
dracut Warning: No root device
"block:/dev/disk/by-uuid/cedcbd9c-32eb-4a3f-9dad-ae5fc560642a" found





dracut Warning: Boot has failed. To debug this issue add "rdshell" to the
kernel command line.


dracut Warning: Signal caught!

dracut Warning: Boot has failed. To debug this issue add "rdshell" to the
kernel command line.
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000100

CPU: 1 PID: 1 Comm: init Tainted: GF            3.13.0-rc5 #6
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
 0000000000000001 ffff88005dbf9d98 ffffffff8156c92b 000000000000fffe
 ffffffff817dd350 ffff88005dbf9e18 ffffffff8156c6b8 ffffffff00000010
 ffff88005dbf9e28 ffff88005dbf9dc8 ffff88005dbdf7b8 ffff88005dbf9dd8
Call Trace:
 [<ffffffff8156c92b>] dump_stack+0x49/0x5e
 [<ffffffff8156c6b8>] panic+0xbb/0x1d5
 [<ffffffff8104e75b>] find_new_reaper+0x17b/0x180
 [<ffffffff8104f8e5>] forget_original_parent+0x45/0x1c0
 [<ffffffff8111e1f0>] ? perf_cgroup_switch+0x180/0x180
 [<ffffffff8104fa77>] exit_notify+0x17/0x130
 [<ffffffff8104fd7e>] do_exit+0x1ee/0x480
 [<ffffffff81050061>] do_group_exit+0x51/0xc0
 [<ffffffff810500e7>] SyS_exit_group+0x17/0x20
 [<ffffffff81579212>] system_call_fastpath+0x16/0x1b
-------------------------------------------------------------------------------

>From 2 and 3 it seems that scsi_wait_scan is necessary in some cases, like H87
board and my KVM case.

Any idea, Can anyone tell me how to move on? Thanks in advance.

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--- Comment #51 from zakrzewskim@wp.pl ---
What king of KVM do you use ? Is this Proxmox ?

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--- Comment #52 from Lin Feng <linf@chinanetcenter.com> ---
(In reply to zakrzewskim from comment #51)
> What king of KVM do you use ? Is this Proxmox ?

Hi, it's qemu based on KVM. And the host is fedora20 64bit. I install CentOS6.4
via a liveCD. Here is my xml file for guest configuration, maybe it's helpful
for reproduction.

[root@localhost home]# cat /etc/libvirt/qemu/CentOS6.4.xml 
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
  virsh edit CentOS6.4
or other application using the libvirt API.
-->

<domain type='kvm'>
  <name>CentOS6.4</name>
  <uuid>52eb93be-64ad-45e8-9e19-5bac87e57bca</uuid>
  <memory unit='KiB'>1572864</memory>
  <currentMemory unit='KiB'>1572864</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-1.6'>hvm</type>
    <boot dev='cdrom'/>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/CentOS6.4.img'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
    </disk>
    <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hda' bus='ide'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <master startport='0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'
multifunction='on'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci2'>
      <master startport='2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <master startport='4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x1'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:cb:94:2c'/>
      <source network='default'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <channel type='spicevmc'>
      <target type='virtio' name='com.redhat.spice.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <graphics type='spice' autoport='yes'/>
    <sound model='ich6'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
    </sound>
    <video>
      <model type='qxl' ram='65536' vram='65536' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08'
function='0x0'/>
    </memballoon>
  </devices>
</domain>

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=60758

--- Comment #53 from Lin Feng <linf@chinanetcenter.com> ---
hello,

After diving into it I found that in my qemu-VM case "FATAL: Module
scsi_wait_scan" is not the root cause, because even I backport the
scsi_wait_scan module, it still can't boot, but reports "dracut Warning: No
root device "block:/dev/disk/by-uuid/cedcbd9c-32eb-4a3f-9dad-ae5fc560642a"
found". 

I bisect through the 3.13-rc6 tree of upstream, and locates this commit broke
my initramfs, 
[root@CentOS6 linux]# git bisect bad
1cf7e9c68fe84248174e998922b39e508375e7c1 is the first bad commit
commit 1cf7e9c68fe84248174e998922b39e508375e7c1
Author: Jens Axboe <axboe@kernel.dk>
Date:   Fri Nov 1 10:52:52 2013 -0600

    virtio_blk: blk-mq support

    Switch virtio-blk from the dual support for old-style requests and bios
    to use the block-multiqueue.

    Acked-by: Asias He <asias@redhat.com>
    Signed-off-by: Jens Axboe <axboe@kernel.dk>
    Signed-off-by: Christoph Hellwig <hch@lst.de>

though it's somthing about virtio driver(my guest uses virtio as the storage
driver), looking into this commit it is mainly about C code changes, not module
compiling or not. Also I have checked the modules compiled, in both cases(with
and without this commit) we get virtio_blk.ko module. But the difference is
that with this commit virtio_blk.ko isn't packed into the initramfs. 

However between both cases there is no environmental changes, with exactly the
same config, same dracut, same gcc, everything...So I don't know why dracut
doesn't pack the virtio_blk.ko into the initramfs, and more kidding I find that
it packed the floppy.ko instead. 
(In my case as a workround we can compile virtio moduels into kernel or use
other disk bus driver such as IDE or USB instead)

But one thing I don't understand can someone tell me why, Will dracut look
through the kernel tree(C codes) to find some useful information to pack the
final initramfs?

Ps. Related to the initial creative of this bugzilla, I guess it may also be
caused by some storage drivers are not packed into initramfs.

thanks

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #54 from Akemi Yagi <toracat@elrepo.org> ---
(In reply to Lin Feng from comment #53)

> though it's somthing about virtio driver(my guest uses virtio as the storage
> driver), looking into this commit it is mainly about C code changes, not
> module compiling or not. Also I have checked the modules compiled, in both
> cases(with and without this commit) we get virtio_blk.ko module. But the
> difference is that with this commit virtio_blk.ko isn't packed into the
> initramfs. 
> 
> However between both cases there is no environmental changes, with exactly
> the same config, same dracut, same gcc, everything...So I don't know why
> dracut doesn't pack the virtio_blk.ko into the initramfs, and more kidding I
> find that it packed the floppy.ko instead. 
> (In my case as a workround we can compile virtio moduels into kernel or use
> other disk bus driver such as IDE or USB instead)
> 
> But one thing I don't understand can someone tell me why, Will dracut look
> through the kernel tree(C codes) to find some useful information to pack the
> final initramfs?

Thank you for this extensive analysis. I, too, was having the same problem on
my KVM guest that uses virtio (host=RHEL 6.5 and guest=CentOS 6.5). Just to
reconfirm your findings, I created initramfs with a '--add-drivers virtio_blk'
option and the kernel booted just fine.

It would indeed be great if we could find out why dracut fails to pick up some
particular modules.

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=60758

abiko <antun@martuna.co> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |antun@martuna.co

--- Comment #55 from abiko <antun@martuna.co> ---
I've had this problem on my CentOS 6 boxes on 3.10, 3.12, until I've cleared
the .config files from the kernel source directory and you would need to have
Virtio suppoer for block, PCI, net devices compiled in kernel (either a module
or embedded).

Good guide to follow is: http://www.linux-kvm.org/page/Virtio

This has  been tested on following kernels:

kernel 3.10.27
kernel 3.10.28
kernel 3.12.8
kernel 3.12.9
kernel 3.13

Currently using the 3.12.8 kernel on one of my VMs :
root@dev01 [~]# lsinitrd /boot/initrd-3.12.8.img | grep virt
-rw-r--r--   1 root     root        28720 Jan 25 04:14
lib/modules/3.12.8/kernel/drivers/block/virtio_blk.ko
-rw-r--r--   1 root     root        26688 Jan 25 04:14
lib/modules/3.12.8/kernel/drivers/scsi/virtio_scsi.ko
drwxr-xr-x   2 root     root            0 Jan 25 04:14
lib/modules/3.12.8/kernel/drivers/virtio
-rw-r--r--   1 root     root        12752 Jan 25 04:14
lib/modules/3.12.8/kernel/drivers/virtio/virtio.ko
-rw-r--r--   1 root     root        18304 Jan 25 04:14
lib/modules/3.12.8/kernel/drivers/virtio/virtio_mmio.ko
-rw-r--r--   1 root     root        20744 Jan 25 04:14
lib/modules/3.12.8/kernel/drivers/virtio/virtio_pci.ko
-rw-r--r--   1 root     root        20912 Jan 25 04:14
lib/modules/3.12.8/kernel/drivers/virtio/virtio_ring.ko

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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kometch@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kometch@gmail.com

--- Comment #56 from kometch@gmail.com ---
I also tried to introduced something to CentOS 6.5 and KVM on Ubuntu13.10, was
the kernel compile the Kernel 3.13.2, but it does not start and continue to be
output "module scsi_wait_scan not found". 

In the following, there is no /block/virtio_blk.ko result of the execution of
lsinitrd. 

# Lsinitrd /boot/initramfs-3.13.2.img | grep virt 
drwxr-xr-x 2 root root 0 Feb 8 00:50 lib/modules/3.13.2/kernel/drivers/virtio 
-rw-r - r - 1 root root 13216 Feb 8 00:50
lib/modules/3.13.2/kernel/drivers/virtio/virtio.ko 
-rw-r - r - 1 root root 19944 Feb 8 00:50
lib/modules/3.13.2/kernel/drivers/virtio/virtio_pci.ko 
-rw-r - r - 1 root root 19448 Feb 8 00:50
lib/modules/3.13.2/kernel/drivers/virtio/virtio_ring.ko 

it did not improve work even reconfigure the initramfs with dracut. 

Is there a way to deal about this?

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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Thorsten Kohfeldt <thorsten.kohfeldt@gmx.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thorsten.kohfeldt@gmx.de

--- Comment #57 from Thorsten Kohfeldt <thorsten.kohfeldt@gmx.de> ---
I have filed a bug against dracut:

https://bugzilla.redhat.com/show_bug.cgi?id=1067669

which gives an explanation at least for kernel 3.13.


That kernel version introduces multi queue block i/o for virtio_blk, which in
turn does not any more call blk_init_queue() but blk_mq_init_queue() instead.

Dracut matches against symbol blk_init_queue but not yet against symbol
blk_mq_init_queue.

This should be fixed for Fedora and also for all RHEL derivatives ...


In the mean time there is this WORKAROUND:

1) check if virtio_blk is in intrd:
# for i in /boot/initramfs-* ; do echo $i: ; lsinitrd $i | grep virt ; done

2) if virtio_blk is missing in the relevant initrd, then

# echo 'add_drivers+="virtio_blk"'
>/etc/dracut.conf.d/force-vitio_blk-to-ensure-boot.conf
   (NOTE that the .conf extension is mandatory !)

3) then rebuild the initrd

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=60758

--- Comment #58 from Thorsten Kohfeldt <thorsten.kohfeldt@gmx.de> ---
Please verify/confirm (add comments to) that redhat/dracut bug/solution, so it
gets dracut maintainers' attention.

https://bugzilla.redhat.com/show_bug.cgi?id=1067669

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=60758

--- Comment #59 from Lin Feng <linf@chinanetcenter.com> ---
(In reply to Thorsten Kohfeldt from comment #57)
> I have filed a bug against dracut:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1067669
> 
> which gives an explanation at least for kernel 3.13.
> 
> 
> That kernel version introduces multi queue block i/o for virtio_blk, which
> in turn does not any more call blk_init_queue() but blk_mq_init_queue()
> instead.
> 
> Dracut matches against symbol blk_init_queue but not yet against symbol
> blk_mq_init_queue.
> 
Good, based on the bisect it seems that it's the root cause, thanks :)

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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https://bugzilla.kernel.org/show_bug.cgi?id=60758

Jamie Bainbridge <jamie.bainbridge@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jamie.bainbridge@gmail.com

--- Comment #60 from Jamie Bainbridge <jamie.bainbridge@gmail.com> ---
This was resolved in dracut with
http://git.kernel.org/cgit/boot/dracut/dracut.git/commit/?id=faa17f09218ed7e2ce4362cc2d9319f8d5b7a37f
which was included in Red Hat's dracut-004-356.el6 package.

This bug can be closed.

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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Shah Samir (Sam.shahl37@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |Sam.shahl37@gmail.com

--- Comment #61 from Shah Samir (Sam.shahl37@gmail.com) ---
@jamie,

I too facing the same error, to look for the solution I tried to go to
http://git.kernel.org/cgit/boot/dracut/dracut.git/commit/?id=faa17f09218ed7e2ce4362cc2d9319f8d5b7a37f
but it seems that commit is bad or not available.

Can you help me out here?

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #62 from Jamie Bainbridge (jamie.bainbridge@gmail.com) ---
Looks like the repo is here now:

https://github.com/dracutdevs/dracut/commit/faa17f09218ed7e2ce4362cc2d9319f8d5b7a37f

It's been over 10 years since this commit. I don't remember anything about it
sorry.

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[Bug 60758] module scsi_wait_scan not found kernel panic on boot

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--- Comment #63 from Shah Samir (Sam.shahl37@gmail.com) ---
Thanks for prompt response @Jamie.

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