Looking at kernel bugs on bugs.centos.org is not very useful.

CentOS does not make code changes, it only rebuilds packages that are released for RHEL and publishes them. We really have no idea what code changes have been made by Red Hat. The current CentOS 7.7 kernel is 3.10.0-1062.4.1.el7.x86_64 and there are over 32,000 entries in `rpm -q --changelog kernel-3.10.0-1062.4.1.el7.x86_64` before you reach any mention of the 3.10.0-693.* 7.4-series kernels. That's 32,000 potential bugs that could have fixed your problem.

If someone who had that problem had updated to a newer kernel and reported it as fixed then we would probably have closed that bug. Since no-one has, that either means they didn't care enough to update the bug report or no-one has tested it or it's not fixed. It would appear that you'll be the one to find out...

Trevor

On 05/11/2019 18:57, sumit gambhir wrote:

https://bugs.centos.org/view.php?id=14265#history.%C2%A0is still in the open state.  Or Is it fixed in CentOS 7.7?

On Wed, Nov 6, 2019 at 12:20 AM Trevor Hemsley <trevor.hemsley@ntlworld.com mailto:trevor.hemsley@ntlworld.com> wrote:

Run `yum update`. You are more than 2 years out of date.

Only the current version - 7.7 at present - is supported, any
other version, the answer is update.

Trevor

On 05/11/2019 18:20, sumit gambhir wrote:

...

There was a power cycle during the upgrade. 

We got following trace during kernel panic.

Cannot login after software upgrade – system initializing message
on Portal; on cli login prompt is seen following messages:


System crashing due to
[ 8780.678167] Hardware name: Cisco Systems, Inc.
ENCS5412/K9/ENCS5412/K9, BIOS ENCS54_2.7.020620190951 02/06/2019
[ 8780.800565] Workqueue: events flush_to_ldisc
[ 8780.853390] task: ffff9707f4bf30c0 ti: ffff9707f4448000
task.ti: ffff9707f4448000
[ 8780.944588] RIP: 0010:[<ffffffff83874b73>]
[<ffffffff83874b73>] uart_write_room+0x13/0x50
[ 8781.045274] RSP: 0018:ffff9707f444bc60 EFLAGS: 00010286
[ 8781.110468] RAX: 0000000000000800 RBX: 000000000000000a RCX:
ffff9707f444bfd8
[ 8781.197509] RDX: ffffffff83874b60 RSI: ffff970ed8206c00 RDI:
ffff970ed8205000
[ 8781.284540] RBP: ffff9707f444bc70 R08: ffff970ec1e6ec00 R09:
a3c427ffdbc3c000
[ 8781.371561] R10: a3c427ffdbc3c000 R11: 0000000000000001 R12:
0000000000000000
[ 8781.458579] R13: ffff970ed8205000 R14: ffff970ed8206c00 R15:
ffff970ec1e6ecf6
[ 8781.545589] FS: 0000000000000000(0000)
GS:ffff970edf000000(0000) knlGS:0000000000000000
[ 8781.644060] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 8781.714429] CR2: 0000000000000150 CR3: 000000085b2be000 CR4:
00000000003607f0
[ 8781.801442] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 8781.888437] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[ 8781.975407] Call Trace:
[ 8782.006205] [<ffffffff8385c730>] tty_write_room+0x20/0x30
[ 8782.073406] [<ffffffff8385966e>] process_echoes+0x6e/0x2e0
[ 8782.141642] [<ffffffff83b65e92>] ? mutex_lock+0x12/0x2f
[ 8782.206744] [<ffffffff8385c14c>] n_tty_receive_char+0xd4c/0xe30
[ 8782.280188] [<ffffffff8385c3dc>] n_tty_receive_buf+0x1ac/0x470
[ 8782.352569] [<ffffffff8385f1ff>] flush_to_ldisc+0x10f/0x160
[ 8782.421832] [<ffffffff834b9d4f>] process_one_work+0x17f/0x440
[ 8782.493188] [<ffffffff834bade6>] worker_thread+0x126/0x3c0
[ 8782.561412] [<ffffffff834bacc0>] ?
manage_workers.isra.25+0x2a0/0x2a0
[ 8782.641074] [<ffffffff834c1c31>] kthread+0xd1/0xe0
[ 8782.700887] [<ffffffff834c1b60>] ? insert_kthread_work+0x40/0x40
[ 8782.775363] [<ffffffff83b74c37>]
ret_from_fork_nospec_begin+0x21/0x21
[ 8782.855038] [<ffffffff834c1b60>] ? insert_kthread_work+0x40/0x40
[ 8782.929516] Code: 01 00 00 81 e3 ff 0f 00 00 e8 0a 56 2f 00 89
d8 5b 41 5c 5d c3 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 41 54 53 4c
8b a7 18 02 00 00 <49> 8b bc 24 50 01 00 00 e8 50 59 2f 00 41 8b
9c 24 48 01 00 00
[ 8783.165634] RIP [<ffffffff83874b73>] uart_write_room+0x13/0x50
[ 8783.238184] RSP <ffff9707f444bc60>
[ 8783.281471] CR2: 0000000000000150

 

 

While going through the list of cases on centos, we found this
similar case - https://bugs.centos.org/view.php?id=14265#history.
However, there has been no activity on it since long. 

Can you please help us out to find out if there is an ongoing fix
for it?


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