panic: non-current pmap on RPI3 on CURRENT (GENERIC) #4 r356366

[bob prohaska]

On Thu, Jan 09, 2020 at 09:23:14AM -0800, bob prohaska wrote:
> On Thu, Jan 09, 2020 at 01:51:23PM +0200, Konstantin Belousov wrote:
> > 
> > It would be useful to see both the curcpu pc_curpmap content,
> > and dump both *(struct pmap *)0xfffffd000385f5a0 and *pc_curpmap
> > from the vmcore.

The Pi3 is now up to r362283 and just reported:

panic: non-current pmap 0xfffffd000142d440
cpuid = 0
time = 1593368952
KDB: stack backtrace:
db_trace_self() at db_trace_self_wrapper+0x28
	 pc = 0xffff00000075e24c  lr = 0xffff00000010a468
	 sp = 0xffff00005a86d2e0  fp = 0xffff00005a86d4e0

db_trace_self_wrapper() at vpanic+0x194
	 pc = 0xffff00000010a468  lr = 0xffff000000419dcc
	 sp = 0xffff00005a86d4f0  fp = 0xffff00005a86d540

vpanic() at panic+0x44
	 pc = 0xffff000000419dcc  lr = 0xffff000000419b74
	 sp = 0xffff00005a86d550  fp = 0xffff00005a86d600

panic() at pmap_remove_pages+0x908
	 pc = 0xffff000000419b74  lr = 0xffff000000776e00
	 sp = 0xffff00005a86d610  fp = 0xffff00005a86d680

pmap_remove_pages() at vmspace_exit+0x104
	 pc = 0xffff000000776e00  lr = 0xffff0000006f7024
	 sp = 0xffff00005a86d690  fp = 0xffff00005a86d6e0

vmspace_exit() at exit1+0x48c
	 pc = 0xffff0000006f7024  lr = 0xffff0000003d13fc
	 sp = 0xffff00005a86d6f0  fp = 0xffff00005a86d750

exit1() at sys_sys_exit+0x10
	 pc = 0xffff0000003d13fc  lr = 0xffff0000003d0f6c
	 sp = 0xffff00005a86d760  fp = 0xffff00005a86d7b0

sys_sys_exit() at do_el0_sync+0x3f8
	 pc = 0xffff0000003d0f6c  lr = 0xffff00000077dac8
	 sp = 0xffff00005a86d7c0  fp = 0xffff00005a86d830

do_el0_sync() at handle_el0_sync+0x90
	 pc = 0xffff00000077dac8  lr = 0xffff000000760a24
	 sp = 0xffff00005a86d840  fp = 0xffff00005a86d980

handle_el0_sync() at 0x404bd678
	 pc = 0xffff000000760a24  lr = 0x00000000404bd678
	 sp = 0xffff00005a86d990  fp = 0x0000ffffffffe960

KDB: enter: panic
[ thread pid 42572 tid 100137 ]
Stopped at      0x4053fcfc
db> 


This time it was in the early stages of compiling www/chromium.
Boot and root are from a mechanical hard disk, the dying top page
was:

last pid: 42562;  load averages:  1.40,  1.37,  1.38                      up 8+22:05:11  11:29:10
47 processes:  3 running, 44 sleeping
CPU: 27.1% user,  0.0% nice, 11.4% system,  0.4% interrupt, 61.0% idle
Mem: 92M Active, 237M Inact, 1468K Laundry, 158M Wired, 77M Buf, 415M Free
Swap: 6042M Total, 194M Used, 5849M Free, 3% Inuse
packet_write_wait: Connection to 50.1.20.28 port 22: Broken pipe
bob at raspberrypi:~ $ R PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
42514 root          1  88    0   111M    63M CPU2     2   0:08 100.21% c++
81775 bob           1  52    0    13M   352K wait     0   9:50   0.35% sh
29366 bob           1  20    0    14M  1340K CPU0     0   3:00   0.22% top
29351 bob           1  20    0    20M   936K select   2   0:15   0.03% sshd
  639 root          1  20    0    13M   972K select   3   0:28   0.01% syslogd
30908 root          1  52    0   194M    40M select   1   1:52   0.00% ninja
46086 bob           1  20    0    20M   312K select   0   1:48   0.00% sshd
......

I'll  update OS sources and try again, if somebody can tell me
how to capture more useful information I'll try that.

Thanks for reading,

bob prohaska