Re: New kernel

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On Fri, 2021-07-23 at 13:56 -0600, Chris Murphy wrote:
> On Fri, Jul 23, 2021 at 12:48 PM Patrick O'Callaghan
> <pocallaghan@xxxxxxxxx> wrote:
> > 
> > On Fri, 2021-07-23 at 21:09 +0300, jarmo wrote:
> > > Somethin went't wrong. Got updates of new kernel,
> > > kernel-5.13.4-200.fc34.x86_64.
> > > 
> > > Now my HPlaptop won't start. I can write to loginwindow
> > > asked passwd. After that everything hangs.
> > > with kernel 5.12.15-300.fc34.x86_64 works. I have system in
> > > legacy
> > > mode, no LVM no UEFI.
> > > Only patitions there are /swap and / FS is EXT4...
> > > An my wife's Toshiba Satellite, After I disabled /dev/zram0 from
> > > system, because from boot.log I could see, that It tried to
> > > create
> > > SWAP to /dev/zram0. That Toshiba has also partitions /swap and /
> > > EXT4 no LVM no UEFI.
> > > After disbling, it boots, but takes terrible time, "fedora
> > > sircle"
> > > stops and takes long time to start XFCE4 VM.
> > 
> > I have that kernel and had to hard-reset my system after load
> > average
> > went to over 30, apparently due to a BTRFS cache flush process. May
> > or
> > may not be related. It has never happened before.
> 
> If you can find the boot this happened in and file a bug against the
> kernel, that would be great:
> 
> This can help find the boot that it happened with
> journalctl --list-boots
> 
> I also will use this method to iterate to find the boot, with the
> kernel appearing in the first line.
> journalctl -b-1
> journalctl -b-2
> and so on, goes back each boot
> 
> For the log to attach, you can filter just for kernel messages with
> 
> journalctl -b-3 -k -o short-monotonic --no-hostname > dmesg.txt
> 
> So that's the 3rd boot back, kernel messages only, monotonic time
> stamps, and no hostname, directed to a file that you can attach to
> the
> bug.
> 

Before I posting to BZ I noticed this at the end of dmesg.txt (captured
as you said):

[104791.682109] kernel: CPU: 7 PID: 150724 Comm: ThreadPoolSingl Tainted: P    B      OE     5.13.4-200.fc34.x86_64 #1
[104791.682111] kernel: Hardware name: MSI MS-7808/B75MA-E33 (MS-7808), BIOS V1.7 09/30/2013
[104791.682112] kernel: Call Trace:
[104791.682113] kernel:  dump_stack+0x76/0x94
[104791.682116] kernel:  bad_page.cold+0x9b/0xa0
[104791.682118] kernel:  free_pcp_prepare+0x185/0x1c0
[104791.682121] kernel:  free_unref_page_list+0xc1/0x1e0
[104791.682124] kernel:  release_pages+0xe0/0x520
[104791.682129] kernel:  tlb_flush_mmu+0x4b/0x150
[104791.682132] kernel:  unmap_page_range+0xa5b/0xe30
[104791.682137] kernel:  unmap_vmas+0x6a/0xd0
[104791.682140] kernel:  exit_mmap+0x8e/0x1a0
[104791.682143] kernel:  mmput+0x61/0x140
[104791.682146] kernel:  begin_new_exec+0x4be/0xa30
[104791.682150] kernel:  load_elf_binary+0x6f1/0x1640
[104791.682152] kernel:  ? __kernel_read+0x18f/0x2b0
[104791.682154] kernel:  ? __kernel_read+0x18f/0x2b0
[104791.682156] kernel:  bprm_execve+0x26a/0x630
[104791.682159] kernel:  do_execveat_common.isra.0+0x184/0x1c0
[104791.682162] kernel:  __x64_sys_execve+0x33/0x40
[104791.682165] kernel:  do_syscall_64+0x40/0x80
[104791.682167] kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xae
[104791.682170] kernel: RIP: 0033:0x7fc32667e04b
[104791.682173] kernel: Code: Unable to access opcode bytes at RIP 0x7fc32667e021.
[104791.682174] kernel: RSP: 002b:00007fc30d3e4be8 EFLAGS: 00000206 ORIG_RAX: 000000000000003b
[104791.682176] kernel: RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fc32667e04b
[104791.682177] kernel: RDX: 000006cc0060cfc0 RSI: 000006cc0b87b2c0 RDI: 000006cc02226700
[104791.682178] kernel: RBP: 00007fc30d3e4c50 R08: 0000000000000000 R09: 00007fc30d3e64d0
[104791.682179] kernel: R10: 0000000000000000 R11: 0000000000000206 R12: 000006cc0b87b2c0
[104791.682180] kernel: R13: 000006cc0060cfc0 R14: 000006cc02226700 R15: 000006cc0b556720
[104791.697740] kernel: BUG: Bad rss-counter state mm:00000000625f9e74 type:MM_FILEPAGES val:-1
[104791.697756] kernel: BUG: Bad rss-counter state mm:00000000625f9e74 type:MM_ANONPAGES val:1

Do you think that indicates a hardware problem?

> Even better is if you can reproduce the high load and try to capture
> one or more of the following: sysrq+l which will dump the result into
> dmesg and will end up in the journal, which you can filter similarly:
> journalctl -b -k -o short-monotonic --no-hostname > dmesg-
> cpustack.txt

I've no idea what caused the high load. I wasn't doing anything out of
the ordinary.

poc
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