Re: post 3.14 serial regression

From: Dave Hansen
Date: Tue Apr 08 2014 - 17:03:54 EST

On 04/08/2014 04:27 AM, One Thousand Gnomes wrote:
>> At the end, you can see that init is somehow dying. If I revert this
>> patch, init is happy again and doesn't die, and the serial console works
>> like before.
>
> Can you check if init is getting a SIGHUP - possibly its opening the
> device and when it goes away gets a hangup which it isn't catching ?

I do see plenty of SIGCHLDs and a heap of SIGTERMs to 'systemd-udevd',
but no SIGHUP. I do see a "Warning: unable to open an initial console."
now, though. (details far below)

I instrumented uart_remove_one_port(). It *looks* like while searching
for a uart_port for 0x1008 (my actual port),
serial8250_find_match_or_unused() finds 0x3e8 since 0x3e8 is
PORT_UNKNOWN. The new code unregisters the 0x1008 console since it
_thinks_ it is about to re-register it.

> [ 18.280937] uart_remove_one_port() uport: ffffffff828c8020 uart_console(uport): 1 iobase: 3e8 membase: (null)
> [ 18.291970] CPU: 12 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc4+ #301
> [ 18.298681] Hardware name: FUJITSU-SV PRIMEQUEST 1800E2/SB, BIOS PRIMEQUEST 1000 Series BIOS Version 1.24 09/14/2011
> [ 18.309438] ffffffff828c8020 ffff881ff2c2b9f8 ffffffff816ca8b5 0000000000000006
> [ 18.316941] ffff88fff1698730 ffff881ff2c2ba28 ffffffff813c759b ffffffff828c8020
> [ 18.324452] 00000000ffffffe4 ffff881ff2c2ba88 ffffffff81cddf20 ffff881ff2c2ba58
> [ 18.331962] Call Trace:
> [ 18.334447] [<ffffffff816ca8b5>] dump_stack+0x4e/0x68
> [ 18.339665] [<ffffffff813c759b>] uart_remove_one_port+0x12b/0x1b0
> [ 18.345935] [<ffffffff813cb2af>] serial8250_register_8250_port+0xbf/0x3c0
> [ 18.352915] [<ffffffff813ce105>] pciserial_init_ports+0x105/0x200
> [ 18.359184] [<ffffffff813ce2c9>] pciserial_init_one+0xc9/0x1e0
> [ 18.365198] [<ffffffff8135cd1d>] local_pci_probe+0x2d/0x80
> [ 18.370849] [<ffffffff8135d549>] pci_device_probe+0xe9/0x130
> [ 18.376686] [<ffffffff813df4e9>] driver_probe_device+0x89/0x390
> [ 18.382778] [<ffffffff813df89b>] __driver_attach+0xab/0xb0
> [ 18.388434] [<ffffffff813df7f0>] ? driver_probe_device+0x390/0x390
> [ 18.394795] [<ffffffff813dd57e>] bus_for_each_dev+0x5e/0x90
> [ 18.400539] [<ffffffff813df1ee>] driver_attach+0x1e/0x20
> [ 18.406016] [<ffffffff813ddfc7>] bus_add_driver+0x127/0x250
> [ 18.411764] [<ffffffff81d63bda>] ? early_serial_setup+0x138/0x138
> [ 18.418032] [<ffffffff813dfcf4>] driver_register+0x64/0xf0
> [ 18.423687] [<ffffffff81d63bda>] ? early_serial_setup+0x138/0x138
> [ 18.429963] [<ffffffff8135d2c4>] __pci_register_driver+0x64/0x70
> [ 18.436146] [<ffffffff81d62f1b>] ? sysrq_always_enabled_setup+0x20/0x20
> [ 18.442954] [<ffffffff81d63bf3>] serial_pci_driver_init+0x19/0x1b
> [ 18.449227] [<ffffffff81d25f7e>] do_one_initcall+0x9e/0x133
> [ 18.454967] [<ffffffff81d26119>] kernel_init_freeable+0x106/0x19a
> [ 18.461241] [<ffffffff81d258af>] ? do_early_param+0x86/0x86
> [ 18.466989] [<ffffffff816bc090>] ? rest_init+0xe0/0xe0
> [ 18.472285] [<ffffffff816bc09e>] kernel_init+0xe/0xf0
> [ 18.477503] [<ffffffff816d58fc>] ret_from_fork+0x7c/0xb0
> [ 18.482978] [<ffffffff816bc090>] ? rest_init+0xe0/0xe0
> [ 18.488277] console [ttyS2] disabled

The last, desperate attempt in serial8250_find_match_or_unused() appears
to incorrectly hone in on my early printk port. But, even if I comment
it out, I still can't boot. The only way that work is to revert that patch.

> [ 74.281757] TCP: cubic registered
> [ 74.284954] NET: Registered protocol family 17
> [ 74.301226] registered taskstats version 1
> [ 74.311464] console [netcon0] enabled
> [ 74.315018] netconsole: network logging started
> [ 74.319612] /home/davehans/linux.git/drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
> [ 74.429357] Warning: unable to open an initial console.
> [ 74.455233] Freeing unused kernel memory: 1200K (ffffffff81d10000 - ffffffff81e3c000)
> [ 74.463028] Write protecting the kernel read-only data: 12288k
> [ 74.503540] Freeing unused kernel memory: 1168K (ffff8800016dc000 - ffff880001800000)
> [ 74.528592] Freeing unused kernel memory: 1556K (ffff880001a7b000 - ffff880001c00000)
> [ 74.531566] input: AT Raw Set 2 keyboard as /devices/platform/i8042/serio0/input/input0
> [ 74.581041] __send_signal(17, ffff883ff18d1df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.588753] __send_signal(17, ffff885ff1e87df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.592402] __send_signal(17, ffff887ff18b7df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.599975] __send_signal(17, ffff889ff1f45df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.611401] __send_signal(17, ffff88bff1959df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.619939] __send_signal(17, ffff88dff1f75df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.600332] __send_signal(17, ffff88fff11dddf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.608839] __send_signal(17, ffff881ff10f7df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.651958] __send_signal(17, ffff883ff190bdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.659443] __send_signal(17, ffff885ff1e87df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.663930] __send_signal(17, ffff887ff18b7df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.672501] __send_signal(17, ffff889ff1f45df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.682406] __send_signal(17, ffff88bff1959df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.689887] __send_signal(17, ffff88dff1f75df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.671456] __send_signal(17, ffff88fff11dddf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.679483] __send_signal(17, ffff881ff111bdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.720648] __send_signal(17, ffff881ff1139df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.730058] __send_signal(17, ffff885ff1f11df8, ffff883ff22910f0 / 'all_generic_ide', 1, 0)
> [ 74.738516] __send_signal(17, ffff883ff1923df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.742990] __send_signal(17, ffff889ff1f45df8, ffff887ff1f110f0 / 'blacklist', 1, 0)
> [ 74.750942] __send_signal(17, ffff887ff18e5df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 74.765067] __send_signal(17, ffff88dff1f75df8, ffff88bff36d43c0 / 'udev', 1, 0)
> [ 74.737987] systemd-udevd[886]: starting version 204
> [ 74.843940] scsi 4:0:0:0: CD-ROM TEAC DV-W28S-W J.0A PQ: 0 ANSI: 0
> [ 74.856780] sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
> [ 74.864226] cdrom: Uniform CD-ROM driver Revision: 3.20
> [ 74.870897] sr 4:0:0:0: Attached scsi CD-ROM sr0
> [ 74.876105] sr 4:0:0:0: Attached scsi generic sg1 type 5
> [ 75.268518] __send_signal(17, ffff887ff1a99df8, ffff881ff1190000 / 'systemd-udevd', 1, 0)
> [ 75.924745] __send_signal(17, ffff88fff1265df8, ffff88bff36d43c0 / 'udev', 1, 0)
> [ 75.932409] __send_signal(17, ffff88bff19afdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.936045] __send_signal(17, ffff887ff2741df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.942735] __send_signal(17, ffff887ff2237df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.951754] __send_signal(17, ffff889ff25ffdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.960633] __send_signal(17, ffff889ff2533df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.969671] __send_signal(17, ffff88bff19afdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.976364] __send_signal(17, ffff88bff226fdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.985163] __send_signal(17, ffff88dff26b7df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.964610] __send_signal(17, ffff88dff1f75df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 75.982484] __send_signal(17, ffff88fff1265df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.026264] __send_signal(17, ffff883ff19b5df8, ffff881feeade5a0 / 'fixrtc', 1, 0)
> [ 76.034015] __send_signal(17, ffff881fee077df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.037845] __send_signal(17, ffff885ff25cfdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.061528] __send_signal(17, ffff88bff27c7df8, ffff889ff1d3a1e0 / 'resume', 1, 0)
> [ 76.069223] __send_signal(17, ffff889ff25ffdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.074561] __send_signal(17, ffff887ff2237df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.128750] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
> [ 76.136470] __send_signal(17, ffff889ff2533df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.147712] __send_signal(17, ffff88bff1abbdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.155851] __send_signal(17, ffff88dff2dc7df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.135300] __send_signal(17, ffff88dff2dcddf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.176767] __send_signal(15, ffff88fff123feb0, ffff881ff1190000 / 'systemd-udevd', 1, 0)
> [ 76.185070] __send_signal(15, ffff88fff123feb0, ffff881ff11310f0 / 'systemd-udevd', 1, 0)
> [ 76.185772] __send_signal(17, ffff881ff115bdf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.201536] __send_signal(15, ffff88fff123feb0, ffff881ff12210f0 / 'systemd-udevd', 1, 0)
> [ 76.202083] __send_signal(17, ffff881ff11dbdf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.218146] __send_signal(15, ffff88fff123feb0, ffff881ff12221e0 / 'systemd-udevd', 1, 0)
> [ 76.218687] __send_signal(17, ffff881ff1251df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.234757] __send_signal(15, ffff88fff123feb0, ffff881ff12232d0 / 'systemd-udevd', 1, 0)
> [ 76.235294] __send_signal(17, ffff881ff128bdf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.251368] __send_signal(15, ffff88fff123feb0, ffff881ff12243c0 / 'systemd-udevd', 1, 0)
> [ 76.251914] __send_signal(17, ffff881ff12bfdf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.267982] __send_signal(15, ffff88fff123feb0, ffff881ff12254b0 / 'systemd-udevd', 1, 0)
> [ 76.268455] __send_signal(17, ffff881ff12e3df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.284673] __send_signal(15, ffff88fff123feb0, ffff881ff12265a0 / 'systemd-udevd', 1, 0)
> [ 76.290645] __send_signal(17, ffff881ff130ddf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.301282] __send_signal(15, ffff88fff123feb0, ffff881ff1348000 / 'systemd-udevd', 1, 0)
> [ 76.307173] __send_signal(17, ffff881ff1321df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.317817] __send_signal(15, ffff88fff123feb0, ffff881ff13490f0 / 'systemd-udevd', 1, 0)
> [ 76.323840] __send_signal(17, ffff881ff1345df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.334511] __send_signal(15, ffff88fff123feb0, ffff881ff134a1e0 / 'systemd-udevd', 1, 0)
> [ 76.340489] __send_signal(17, ffff881ff1373df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.351135] __send_signal(15, ffff88fff123feb0, ffff881ff134b2d0 / 'systemd-udevd', 1, 0)
> [ 76.357013] __send_signal(17, ffff881ff13a1df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.367726] __send_signal(15, ffff88fff123feb0, ffff881ff134c3c0 / 'systemd-udevd', 1, 0)
> [ 76.373594] __send_signal(17, ffff881ff13a5df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.390304] __send_signal(15, ffff88fff123feb0, ffff881ff134d4b0 / 'systemd-udevd', 1, 0)
> [ 76.390807] __send_signal(17, ffff881ff13cbdf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.406788] __send_signal(15, ffff88fff123feb0, ffff881ff134e5a0 / 'systemd-udevd', 1, 0)
> [ 76.407315] __send_signal(17, ffff881ff13f1df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.423415] __send_signal(15, ffff88fff123feb0, ffff881fee820000 / 'systemd-udevd', 1, 0)
> [ 76.423881] __send_signal(17, ffff881ff13f5df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.439999] __send_signal(15, ffff88fff123feb0, ffff881fee8210f0 / 'systemd-udevd', 1, 0)
> [ 76.440491] __send_signal(17, ffff881fee81ddf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.456609] __send_signal(15, ffff88fff123feb0, ffff881fee8221e0 / 'systemd-udevd', 1, 0)
> [ 76.457169] __send_signal(17, ffff881fee847df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.473219] __send_signal(15, ffff88fff123feb0, ffff881fee8232d0 / 'systemd-udevd', 1, 0)
> [ 76.473728] __send_signal(17, ffff881fee86ddf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.489831] __send_signal(15, ffff88fff123feb0, ffff881fee8243c0 / 'systemd-udevd', 1, 0)
> [ 76.490314] __send_signal(17, ffff881fee875df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.506441] __send_signal(15, ffff88fff123feb0, ffff881fee8254b0 / 'systemd-udevd', 1, 0)
> [ 76.506934] __send_signal(17, ffff881fee89fdf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.523074] __send_signal(15, ffff88fff123feb0, ffff881fee8265a0 / 'systemd-udevd', 1, 0)
> [ 76.523578] __send_signal(17, ffff881fee8c5df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.539751] __send_signal(15, ffff88fff123feb0, ffff881fee8f8000 / 'systemd-udevd', 1, 0)
> [ 76.540991] __send_signal(17, ffff881fee8f3df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.556278] __send_signal(15, ffff88fff123feb0, ffff881fee8f90f0 / 'systemd-udevd', 1, 0)
> [ 76.556853] __send_signal(17, ffff881fee8f7df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.573009] __send_signal(15, ffff88fff123feb0, ffff881fee8fa1e0 / 'systemd-udevd', 1, 0)
> [ 76.568217] __send_signal(17, ffff881fee927df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.589581] __send_signal(15, ffff88fff123feb0, ffff881fee8fb2d0 / 'systemd-udevd', 1, 0)
> [ 76.557071] __send_signal(17, ffff881fee949df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.606183] __send_signal(15, ffff88fff123feb0, ffff881fee8fc3c0 / 'systemd-udevd', 1, 0)
> [ 76.607417] __send_signal(17, ffff881fee96fdf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.622800] __send_signal(15, ffff88fff123feb0, ffff881fee8fd4b0 / 'systemd-udevd', 1, 0)
> [ 76.590235] __send_signal(17, ffff881fee977df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.639433] __send_signal(15, ffff88fff123feb0, ffff881fee8fe5a0 / 'systemd-udevd', 1, 0)
> [ 76.606763] __send_signal(17, ffff881fee9a3df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.656038] __send_signal(15, ffff88fff123feb0, ffff881fee9f0000 / 'systemd-udevd', 1, 0)
> [ 76.657295] __send_signal(17, ffff881fee9cddf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.672572] __send_signal(15, ffff88fff123feb0, ffff881fee9f10f0 / 'systemd-udevd', 1, 0)
> [ 76.673118] __send_signal(17, ffff881fee9f9df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.689345] __send_signal(15, ffff88fff123feb0, ffff881fee9f21e0 / 'systemd-udevd', 1, 0)
> [ 76.685195] __send_signal(17, ffff881fee9fddf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.705902] __send_signal(15, ffff88fff123feb0, ffff881fee9f32d0 / 'systemd-udevd', 1, 0)
> [ 76.707076] __send_signal(17, ffff881feea2ddf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.722424] __send_signal(15, ffff88fff123feb0, ffff881fee9f43c0 / 'systemd-udevd', 1, 0)
> [ 76.723044] __send_signal(17, ffff881feea51df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.739107] __send_signal(15, ffff88fff123feb0, ffff881fee9f54b0 / 'systemd-udevd', 1, 0)
> [ 76.735020] __send_signal(17, ffff881feea75df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.755749] __send_signal(15, ffff88fff123feb0, ffff881fee9f65a0 / 'systemd-udevd', 1, 0)
> [ 76.756929] __send_signal(17, ffff881feea7ddf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.772261] __send_signal(15, ffff88fff123feb0, ffff881feead8000 / 'systemd-udevd', 1, 0)
> [ 76.772815] __send_signal(17, ffff881feeaafdf8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.757287] __send_signal(17, ffff881feead7df8, ffff88fff10321e0 / 'systemd-udevd', 1, 0)
> [ 76.765742] __send_signal(17, ffff881fee08bdf8, ffff88fff10343c0 / 'udev', 1, 0)
> [ 76.806229] __send_signal(17, ffff88fff123fdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.851892] __send_signal(17, ffff883ff19e3df8, ffff88fff10343c0 / 'udev', 1, 0)
> [ 76.859490] __send_signal(17, ffff885ff276fdf8, ffff88fff10343c0 / 'udev', 1, 0)
> [ 76.862938] __send_signal(17, ffff887ff2151df8, ffff88fff10343c0 / 'udev', 1, 0)
> [ 76.870567] __send_signal(17, ffff88fff1aefdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.892224] __send_signal(17, ffff889ff25ffdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.902651] __send_signal(17, ffff88bff191fdf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.910928] __send_signal(17, ffff88dff2dcddf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.929763] __send_signal(17, ffff88fff1b6ddf8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.936449] __send_signal(17, ffff88fff1af5df8, ffff881ff2c30000 / 'init', 1, 0)
> [ 76.945662] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000200
> [ 76.945662]
> [ 76.954779] CPU: 2 PID: 1 Comm: init Not tainted 3.14.0-rc4+ #300
> [ 76.960962] Hardware name: FUJITSU-SV PRIMEQUEST 1800E2/SB, BIOS PRIMEQUEST 1000 Series BIOS Version 1.24 09/14/2011
> [ 76.971653] ffff883ff1898000 ffff881ff2c2be28 ffffffff816ca8c5 ffff881ff2c30000
> [ 76.979163] ffffffff819b86a0 ffff881ff2c2bea8 ffffffff816c5c19 ffffffff816d4800
> [ 76.986674] ffff881f00000010 ffff881ff2c2beb8 ffff881ff2c2be58 ffff881ff2c2be78
> [ 76.994184] Call Trace:
> [ 76.996665] [<ffffffff816ca8c5>] dump_stack+0x4e/0x68
> [ 77.001879] [<ffffffff816c5c19>] panic+0xd2/0x1f9
> [ 77.006738] [<ffffffff816d4800>] ? _raw_write_unlock_irq+0x30/0x60
> [ 77.013099] [<ffffffff810558f7>] do_exit+0x917/0xa20
> [ 77.018224] [<ffffffff81182e0d>] ? __sb_end_write+0x7d/0x90
> [ 77.023963] [<ffffffff816d4ed8>] ? retint_swapgs+0x13/0x1b
> [ 77.029617] [<ffffffff81055a9f>] do_group_exit+0x4f/0xc0
> [ 77.035097] [<ffffffff81055b27>] SyS_exit_group+0x17/0x20
> [ 77.040663] [<ffffffff816d59e9>] system_call_fastpath+0x16/0x1b
> [ 77.050447] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff)

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