login: panic: kernel diagnostic assertion "bpfilter_lookup(unit) == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/bpf.c", line 379
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 455272  64732      0           0          0    0  syz-executor
*193564  69925      0           0  0x4000000    1K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8344cb14) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff8348ca0b,ffffffff8349f6c0,17b,ffffffff834a9cf0) at __assert+0x29 sys/kern/subr_prf.c:-1
bpfopen(11700,81,2000,ffff80002a242540) at bpfopen+0x2bd bpfilter_lookup sys/net/bpf.c:1832 [inline]
bpfopen(11700,81,2000,ffff80002a242540) at bpfopen+0x2bd sys/net/bpf.c:379
spec_open_clone(ffff80002ebac258) at spec_open_clone+0x277 sys/kern/spec_vnops.c:722
spec_open(ffff80002ebac258) at spec_open+0x319 sys/kern/spec_vnops.c:148
VOP_OPEN(fffffd806131daf8,81,fffffd80097fd7b8,ffff80002a242540) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138
vn_open(ffff80002ebac498,81,0) at vn_open+0x6a0 sys/kern/vfs_vnops.c:177
doopenat(ffff80002a242540,ffffff9c,200000000100,80,0,0,f7e31c1d6d5ccf8c) at doopenat+0x35b sys/kern/vfs_syscalls.c:1155
sys_openat(ffff80002a242540,ffff80002ebac750,ffff80002ebac6a0) at sys_openat+0x58 sys/kern/vfs_syscalls.c:1094
syscall(ffff80002ebac750) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002ebac750) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfc4ebc11f50, count: 3
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{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: kernel diagnostic assertion "bpfilter_lookup(unit) == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/bpf.c", line 379
ddb{1}>