panic: kernel diagnostic assertion "cifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 1089
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*291550  11174      0           0  0x4000000    0  syz-executor
 332892  84002      0         0x2        0x1    1  syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834bf7b2) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834fa343,ffffffff83483e84,441,ffffffff8352c3cf) at __assert+0x29 sys/kern/subr_prf.c:-1
rt_hash(1,ffff80002ef82218,4) at rt_hash
rt_ifa_add(ffff80000163ea00,840100,ffff80000163ea50,0) at rt_ifa_add+0x22e sys/net/route.c:1284
in6_ioctl_change_ifaddr(8080691a,ffff80002ef82480,ffff80000160e800) at in6_ioctl_change_ifaddr+0x79d sys/netinet6/in6.c:382
ifioctl(ffff8000015934c0,8080691a,ffff80002ef82480,ffff800045fe8a80) at ifioctl+0x1714 pru_control sys/sys/protosw.h:353 [inline]
ifioctl(ffff8000015934c0,8080691a,ffff80002ef82480,ffff800045fe8a80) at ifioctl+0x1714 sys/net/if.c:2554
sys_ioctl(ffff800045fe8a80,ffff80002ef82660,ffff80002ef825b0) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1
syscall(ffff80002ef82660) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002ef82660) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfd0c43c8400, count: 5
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
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ddb{0}> set $maxwidth = 0
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