Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts.
2019/10/19 08:48:09 parsed 1 programs
2019/10/19 08:48:16 executed programs: 0
2019/10/19 08:48:21 executed programs: 6
login: panic: Data modified on freelist: word 5 of object 0xffff8000006a0300 size 0x100 previous type devbuf (0xd != 0xdeadbeef)


Stopped at      db_enter+0x18:  addq    $0x8,%rsp

    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND

*517431  73207      0           0  0x4000000    0  syz-executor.0

db_enter() at db_enter+0x18

panic() at panic+0x15c

malloc(100,2,a) at malloc+0xa23

bpfopen(21700,1,2000,ffff8000ffff8ed8) at bpfopen+0xb5

spec_open_clone(ffff800014926478) at spec_open_clone+0x241

spec_open(ffff800014926478) at spec_open+0x40e

VOP_OPEN(fffffd8036cdb750,1,fffffd803f7c6c00,ffff8000ffff8ed8) at VOP_OPEN+0x6a

vn_open(ffff8000149266c8,1,0) at vn_open+0x4eb

doopenat(ffff8000ffff8ed8,ffffff9c,20000040,0,0,ffff8000149268c0) at doopenat+0x28b

syscall(ffff800014926940) at syscall+0x507

Xsyscall(6,0,ffffffffffffffa2,0,4,c37754ec010) at Xsyscall+0x128

end of kernel

end trace frame: 0xc399d215c30, count: 4

https://www.openbsd.org/ddb.html describes the minimum info required in bug

reports.  Insufficient info makes it difficult to find and fix bugs.

ddb> 

ddb> set $lines = 0

ddb> set $maxwidth = 0

ddb> show panic

Data modified on freelist: word 5 of object 0xffff8000006a0300 size 0x100 previous type devbuf (0xd != 0xdeadbeef)


ddb> trace

db_enter() at db_enter+0x18

panic() at panic+0x15c

malloc(100,2,a) at malloc+0xa23

bpfopen(21700,1,2000,ffff8000ffff8ed8) at bpfopen+0xb5

spec_open_clone(ffff800014926478) at spec_open_clone+0x241

spec_open(ffff800014926478) at spec_open+0x40e

VOP_OPEN(fffffd8036cdb750,1,fffffd803f7c6c00,ffff8000ffff8ed8) at VOP_OPEN+0x6a

vn_open(ffff8000149266c8,1,0) at vn_open+0x4eb

doopenat(ffff8000ffff8ed8,ffffff9c,20000040,0,0,ffff8000149268c0) at doopenat+0x28b

syscall(ffff800014926940) at syscall+0x507

Xsyscall(6,0,ffffffffffffffa2,0,4,c37754ec010) at Xsyscall+0x128

end of kernel

end trace frame: 0xc399d215c30, count: -11

ddb>