login: panic: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet/if_ether.c", line 758
Starting stack trace...
panic(ffffffff827ab700) at panic+0x16f sys/kern/subr_prf.c:229
__assert(ffffffff82826dfd,ffffffff82822569,2f6,ffffffff82775569) at __assert+0x29 sys/kern/subr_prf.c:157
arptfree(fffffd806f59aaf0) at arptfree+0x132 sys/netinet/if_ether.c:758
arptimer(ffffffff82c8e7e8) at arptimer+0x88 sys/netinet/if_ether.c:135
timeout_run(ffffffff82c8e7e8) at timeout_run+0xd0 sys/kern/kern_timeout.c:665
softclock_thread(ffff8000211697e8) at softclock_thread+0x114 sys/kern/kern_timeout.c:809
end trace frame: 0x0, count: 251
End of stack trace.