(beagleboneblack/urtwn) Kernel page fault with the following non-sleepable locks held

[Otacílio]

Em 19/06/2016 18:47, Otacílio escreveu:
> Em 19/06/2016 18:40, Otacílio escreveu:
>> I was installing netperf on a fresh FreeBSD-ALPHA3
>>
>> FreeBSD beaglebone 11.0-ALPHA3 FreeBSD 11.0-ALPHA3 #0 r301846: Mon 
>> Jun 13 19:54:27 BRT 2016 
>> ota at nostromo:/root/crochet/work/obj/arm.armv6/usr/src/sys/BEAGLEBONE-DEBUG 
>> arm
>>
>>  on BeagleboneBlack using wrtwn when I got this kernel panic:
>>
>> root at beaglebone:/usr/home/ota # pkg install netperf
>> Updating FreeBSD repository catalogue...
>> Fetching meta.txz: 100%    944 B   0.9kB/s    00:01
>> Fetching packagesite.txz: 100%    4 MiB  46.0kB/s    01:42
>> Processing entries:   6%lock order reversal:
>>  1st 0xc30b35d4 syncer (syncer) @ /usr/src/sys/kern/vfs_subr.c:2048
>>  2nd 0xc319d6f4 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2498
>> stack backtrace:
>> Processing entries:  58%Kernel page fault with the following 
>> non-sleepable locks held:
>> exclusive sleep mutex tcp_sc_head (tcp_sc_head) r = 0 (0xc2f9d520) 
>> locked @ /usr/src/sys/netinet/tcp_syncache.c:494
>> shared rw tcp (tcp) r = 0 (0xc08ef348) locked @ 
>> /usr/src/sys/netinet/tcp_input.c:1034
>> exclusive rw tcpinp (tcpinp) r = 0 (0xc31ab494) locked @ 
>> /usr/src/sys/netinet/in_pcb.c:1964
>> stack backtrace:
>> Fatal kernel mode data abort: 'Alignment Fault' on read
>> trapframe: 0xdcfe58a8
>> FSR=00000001, FAR=c2e7187a, spsr=60000013
>> r0 =c08e7988, r1 =00000004, r2 =c06fa3ad, r3 =000007b6
>> r4 =dcfe5a10, r5 =dcfe5b28, r6 =c2e71876, r7 =c2f9d520
>> r8 =c2f9d520, r9 =c2e71876, r10=dcfe5b28, r11=dcfe5970
>> r12=00000000, ssp=dcfe5938, slr=c2d34370, pc =c053d8e8
>>
>> [ thread pid 13 tid 100036 ]
>> Stopped at      syncookie_lookup+0x38:  ldmib   r6, {r1-r2}
>> db>
>>
>>
>> []'s
>>
>> -Otacílio
>>
> The kernel panic is totally reproducible. I need only do a ssh in the 
> beaglebone using ptty on windows or ssh on freebsd and the kernel 
> panic is raised.
>
> FreeBSD/arm (beaglebone) (ttyu0)
>
> login: Kernel page fault with the following non-sleepable locks held:
> exclusive sleep mutex tcp_sc_head (tcp_sc_head) r = 0 (0xc2f95480) 
> locked @ /usr/src/sys/netinet/tcp_syncache.c:494
> shared rw tcp (tcp) r = 0 (0xc08ef348) locked @ 
> /usr/src/sys/netinet/tcp_input.c:1034
> exclusive rw tcpinp (tcpinp) r = 0 (0xc341e494) locked @ 
> /usr/src/sys/netinet/in_pcb.c:1964
> stack backtrace:
> Fatal kernel mode data abort: 'Alignment Fault' on read
> trapframe: 0xdcfe58a8
> FSR=00000001, FAR=c2e7807a, spsr=60000013
> r0 =c08e7988, r1 =00000004, r2 =c06fa3ad, r3 =000007b6
> r4 =dcfe5a10, r5 =dcfe5b28, r6 =c2e78076, r7 =c2f95480
> r8 =c2f95480, r9 =c2e78076, r10=dcfe5b28, r11=dcfe5970
> r12=00000000, ssp=dcfe5938, slr=c2d34370, pc =c053d8e8
>
> [ thread pid 13 tid 100036 ]
> Stopped at      syncookie_lookup+0x38:  ldmib   r6, {r1-r2}
> db>
>
FreeBSD11-ALPHA4 shows the same behavior. The only thing that I need to 
raise the fault is ssh in the beaglebone.


root at beaglebone:~ # uname -a
FreeBSD beaglebone 11.0-ALPHA4 FreeBSD 11.0-ALPHA4 #0 r301975: Fri Jun 
17 13:32:55 UTC 2016 
root at releng2.nyi.freebsd.org:/usr/obj/arm.armv6/usr/src/sys/BEAGLEBONE arm
root at beaglebone:~ # Kernel page fault with the following non-sleepable 
locks held:
exclusive sleep mutex tcp_sc_head (tcp_sc_head) r = 0 (0xc2f98740) 
locked @ /usr/src/sys/netinet/tcp_syncache.c:494
shared rw tcp (tcp) r = 0 (0xc08ef348) locked @ 
/usr/src/sys/netinet/tcp_input.c:1034
exclusive rw tcpinp (tcpinp) r = 0 (0xc33e4494) locked @ 
/usr/src/sys/netinet/in_pcb.c:1964
stack backtrace:
Fatal kernel mode data abort: 'Alignment Fault' on read
trapframe: 0xdcfe58c0
FSR=00000001, FAR=c2e7a07a, spsr=60000013
r0 =c08e7988, r1 =00000004, r2 =c06fabe6, r3 =000007b6
r4 =dcfe5a28, r5 =dcfe5b40, r6 =c2e7a076, r7 =c2f98740
r8 =c2f98740, r9 =c2e7a076, r10=dcfe5b40, r11=dcfe5988
r12=00000000, ssp=dcfe5950, slr=c2d33370, pc =c053df7c

[ thread pid 13 tid 100036 ]
Stopped at      syncookie_lookup+0x38:  ldmib   r6, {r1-r2}
db>