[Bug 2016908] Re: Unable to deploy hosts with lunar images after 20230319 - fails to connect and download squashfs

[Paolo Pisati]

Kernel side:

kernel/sys.c::SYSCALL_DEFINE5(prctl, int, option,...):

{
        struct task_struct *me = current;
        unsigned char comm[sizeof(me->comm)];
        long error;

        error = security_task_prctl(option, arg2, arg3, arg4, arg5);
        if (error != -ENOSYS)
                return error;

        error = 0;
        switch (option) {
        case PR_SET_PDEATHSIG:
                if (!valid_signal(arg2)) {
                        error = -EINVAL;
                        break;
                }
                me->pdeath_signal = arg2;
                break;

...
        return error;
}

and include/linux/signal.h::valid_signal():

/* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
static inline int valid_signal(unsigned long sig)
{
        return sig <= _NSIG ? 1 : 0;
}

and arch/x86/include/asm/signal.h:#define _NSIG             64

I wonder about security_task_prctl() though.

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Title:
  Unable to deploy hosts with lunar images after 20230319 - fails to
  connect and download squashfs

Status in maas-images:
  Incomplete
Status in systemd package in Ubuntu:
  New

Bug description:
  I'm assuming the image being used for these deploys is 20230417 or
  20230417.1 based on the fact that I saw a 6.2 kernel being used which
  I don't believe was part of the 20230319 serial. I don't have access
  to the maas server, so I can't directly check any log files.

  MAAS Version: 3.3.2

  Here's where the serial log indicates it can't download the squashfs. The full log is attached as scobee-lunar-no-squashfs.log (there are some other console message intermixed):
  no search or nameservers found in /run/net-BOOTIF.conf /run/net-*.conf /run/net6
  -*.conf
  :: root=squash:http://10.229.32.21:5248/images/ubuntu/arm64/ga-23.04/lunar/candi
  date/squa[  206.804704] Btrfs loaded, crc32c=crc32c-generic, zoned=yes, fsverity
  =yes
  shfs
  :: mount_squash downloading http://10.229.32.21:5248/images/ubuntu/arm64/ga-23.0
  4/lunar/candidate/squashfs to /root.tmp.img
  Connecting to 10.229.32.21:5248 (10.229.32.21:5248)
  wget: can't connect to remote host (10.229.32.21): Network is unreachable
  :: mount -t squashfs -o loop  '/root.tmp.img' '/root.tmp'
  mount: mounting /root.tmp.img on /root.tmp failed: No such file or directory
  done.

  
  Still gathering logs and info and will update as I go.

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