login: panic: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet/if_ether.c", line 758 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 73697 80300 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279f281) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820fac,ffffffff828199c3,2f6,ffffffff8276cb3b) at __assert+0x29 sys/kern/subr_prf.c:157 arptfree(fffffd806bee6630) at arptfree+0x132 sys/netinet/if_ether.c:758 arptimer(ffffffff82c54b60) at arptimer+0x88 sys/netinet/if_ether.c:135 timeout_run(ffffffff82c54b60) at timeout_run+0xd0 sys/kern/kern_timeout.c:640 softclock_thread(ffff800021169540) at softclock_thread+0x124 sys/kern/kern_timeout.c:763 end trace frame: 0x0, count: 8 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet/if_ether.c", line 758 ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279f281) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820fac,ffffffff828199c3,2f6,ffffffff8276cb3b) at __assert+0x29 sys/kern/subr_prf.c:157 arptfree(fffffd806bee6630) at arptfree+0x132 sys/netinet/if_ether.c:758 arptimer(ffffffff82c54b60) at arptimer+0x88 sys/netinet/if_ether.c:135 timeout_run(ffffffff82c54b60) at timeout_run+0xd0 sys/kern/kern_timeout.c:640 softclock_thread(ffff800021169540) at softclock_thread+0x124 sys/kern/kern_timeout.c:763 end trace frame: 0x0, count: -7 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800021175910 rbx 0xffffffff82b9fba7 cpu_info_full_primary+0x2ba7 rdx 0 rcx 0xffff800021169540 rax 0xffffffff82b9eff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xe1741239d44e1e14 r11 0xd907cad5df0be3c8 r12 0xffffffff82b9f9a8 cpu_info_full_primary+0x29a8 r13 0 r14 0 r15 0x1 rip 0xffffffff82274d8c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800021175900 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) tid=73697 pid=80300 tcnt=1 stat=onproc flags process=14000 proc=40000200 runpri=0, usrpri=50, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff8000211697e8,0xffff8000211692a8 process=0xffff8000ffffe5b0 user=0xffff800021170000, vmspace=0xffffffff82d36078 estcpu=0, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7775 111203 48040 0 2 0 syz-executor.3 1225 125023 43252 0 2 0 syz-executor.2 1225 26884 43252 0 2 0x4000000 syz-executor.2 20678 237164 1628 0 2 0x480 syz-executor.1 20678 362740 1628 0 3 0x4000080 fsleep syz-executor.1 16193 294956 92397 0 2 0x480 syz-executor.7 16193 367403 92397 0 3 0x4000080 netcon syz-executor.7 16193 36984 92397 0 3 0x4000080 fsleep syz-executor.7 92397 135779 69215 0 3 0x82 nanoslp syz-executor.7 33314 326161 69215 0 2 0x482 syz-executor.4 1628 463071 69215 0 2 0x482 syz-executor.1 43252 273941 69215 0 3 0x82 nanoslp syz-executor.2 48040 302321 69215 0 3 0x82 nanoslp syz-executor.3 5043 353830 1 0 3 0x100083 ttyin getty 92113 7015 0 0 3 0x14280 nfsidl nfsio 86282 293794 0 0 3 0x14280 nfsidl nfsio 65724 403105 0 0 3 0x14280 nfsidl nfsio 60590 251422 0 0 3 0x14280 nfsidl nfsio 84008 96582 0 0 3 0x14280 nfsidl nfsio 30984 485807 0 0 3 0x14280 nfsidl nfsio 60104 396545 0 0 3 0x14280 nfsidl nfsio 59021 214630 0 0 3 0x14280 nfsidl nfsio 43284 113699 0 0 3 0x14280 nfsidl nfsio 26481 237940 0 0 3 0x14280 nfsidl nfsio 32859 169138 0 0 3 0x14280 nfsidl nfsio 14669 360793 0 0 3 0x14280 nfsidl nfsio 99630 311201 0 0 3 0x14280 nfsidl nfsio 8143 130295 0 0 3 0x14280 nfsidl nfsio 92889 509946 0 0 3 0x14280 nfsidl nfsio 9317 445786 0 0 3 0x14280 nfsidl nfsio 65877 27814 0 0 3 0x14280 nfsidl nfsio 40972 202971 0 0 3 0x14280 nfsidl nfsio 48050 475581 0 0 3 0x14280 nfsidl nfsio 66923 103549 0 0 3 0x14280 nfsidl nfsio 71164 491905 69215 0 2 0x2 syz-executor.5 57004 397510 69215 0 2 0x2 syz-executor.6 26088 305297 0 0 3 0x14200 acct acct 65333 54470 0 0 3 0x14200 bored sosplice 69215 63622 77688 0 3 0x2000082 wait syz-fuzzer 69215 292070 77688 0 3 0x6000082 nanoslp syz-fuzzer 69215 7229 77688 0 3 0x6000082 thrsleep syz-fuzzer 69215 268748 77688 0 3 0x6000082 thrsleep syz-fuzzer 69215 9091 77688 0 3 0x6000082 thrsleep syz-fuzzer 69215 505460 77688 0 3 0x6000082 wait syz-fuzzer 69215 136899 77688 0 3 0x6000082 wait syz-fuzzer 69215 279159 77688 0 3 0x6000082 wait syz-fuzzer 69215 414263 77688 0 3 0x6000082 wait syz-fuzzer 69215 69900 77688 0 3 0x6000082 thrsleep syz-fuzzer 69215 469425 77688 0 3 0x6000082 thrsleep syz-fuzzer 69215 208737 77688 0 3 0x6000082 thrsleep syz-fuzzer 69215 433732 77688 0 3 0x6000082 wait syz-fuzzer 69215 253206 77688 0 3 0x6000082 thrsleep syz-fuzzer 69215 416684 77688 0 3 0x6000082 thrsleep syz-fuzzer 69215 306466 77688 0 3 0x6000082 kqread syz-fuzzer 69215 325793 77688 0 3 0x6000082 wait syz-fuzzer 77688 47912 69902 0 3 0x10008a sigsusp ksh 69902 359334 16356 0 3 0x9a kqread sshd 16356 333949 1 0 3 0x88 kqread sshd 39690 484031 34877 74 3 0x1100092 bpf pflogd 34877 281661 1 0 3 0x80 netio pflogd 67452 523966 86914 73 3 0x1100090 kqread syslogd 86914 324874 1 0 3 0x100082 netio syslogd 75432 265 1 0 3 0x100080 kqread resolvd 3893 379830 24057 77 3 0x100092 kqread dhcpleased 44291 147792 24057 77 3 0x100092 kqread dhcpleased 24057 498821 1 0 3 0x80 kqread dhcpleased 93854 85345 0 0 2 0x14200 smr 67927 36141 0 0 2 0x14200 zerothread 14213 128166 0 0 3 0x14200 aiodoned aiodoned 40107 433705 0 0 3 0x14200 syncer update 42165 69569 0 0 3 0x14200 cleaner cleaner 58380 268720 0 0 3 0x14200 reaper reaper 75681 47446 0 0 3 0x14200 pgdaemon pagedaemon 47295 164751 0 0 3 0x14200 bored viomb 5159 384368 0 0 3 0x40014200 acpi0 acpi0 84048 416385 0 0 7 0x40014200 idle1 88165 473399 0 0 3 0x14200 bored softnet3 59053 173746 0 0 3 0x14200 bored softnet2 69542 483556 0 0 3 0x14200 bored softnet1 36748 391798 0 0 3 0x14200 bored softnet0 28027 184971 0 0 3 0x14200 bored systqmp 17815 42696 0 0 3 0x14200 bored systq *80300 73697 0 0 7 0x40014200 softclock 48750 198289 0 0 3 0x40014200 idle0 1 454930 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 57004 (syz-executor.6) thread 0xffff800024707008 (397510) Process 80300 (softclock) thread 0xffff800021169540 (73697) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10237 6574K 7688K 78643K 62010 0 pcb 13 18K 20K 78643K 1979 0 rtable 241 7K 7K 78643K 1875 0 pf 35 10K 10K 78643K 347 0 ifaddr 46 17K 18K 78643K 287 0 ifgroup 60 2K 2K 78643K 539 0 sysctl 3 0K 2K 78643K 10 0 counters 62 36K 36K 78643K 362 0 ioctlops 0 0K 4K 78643K 1725 0 iov 0 0K 28K 78643K 1850 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1744 109K 109K 78643K 15820 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 293 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1929 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 89K 78643K 21057 0 sigio 0 0K 0K 78643K 746 0 proc 70 91K 128K 78643K 2303 0 subproc 104 6K 7K 78643K 455 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1150 0 in_multi 99 7K 7K 78643K 615 0 ether_multi 1 0K 0K 78643K 20 0 mrt 1 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 241 1076K 1076K 78643K 241 0 exec 0 0K 1K 78643K 2544 0 pfkey data 0 0K 0K 78643K 8 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 524 106K 120K 78643K 206604 0 UVM aobj 131 4K 4K 78643K 145 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 692 0 NDP 13 0K 1K 78643K 233 0 temp 75 5920K 6052K 78643K 130675 0 kqueue 12 18K 32K 78643K 1570 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 1395 0 1392 19 18 1 3 0 8 0 rtentry 112 514 0 402 4 0 4 4 0 8 0 unpcb 144 19513 0 19496 182 178 4 13 0 8 3 syncache 304 118 0 118 28 28 0 1 0 8 0 tcpqe 32 243 0 243 17 17 0 1 0 8 0 tcpcb 808 16278 0 16257 361 352 9 16 0 8 6 arp 120 78 0 59 1 0 1 1 0 8 0 ipq 40 4 0 4 1 1 0 1 0 8 0 ipqe 40 12 0 12 1 1 0 1 0 8 0 inpcb 368 28469 0 28352 396 379 17 25 0 8 5 nd6 136 124 0 99 3 1 2 2 0 8 1 pkpcb 40 122 0 122 14 14 0 1 0 8 0 kcovpl 48 35 0 27 1 0 1 1 0 8 0 ppxss 1256 61 0 61 16 16 0 1 0 8 0 pffrag 232 243 0 241 4 3 1 1 0 482 0 pffrnode 88 241 0 239 4 3 1 1 0 8 0 pffrent 40 666 0 664 4 3 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 558 0 522 1 0 1 1 0 8 0 pfstkey 128 564 0 528 4 2 2 2 0 8 0 pfstate 376 564 0 528 18 14 4 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1758 0 1288 35 2 33 33 0 8 3 art_table 32 1759 0 1288 5 0 5 5 0 8 0 art_node 16 432 0 330 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0 semapl 112 1926 0 1916 1 0 1 1 0 8 0 shmpl 112 142 0 14 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 27942 0 26399 97 0 97 97 0 8 0 ffsino 272 27942 0 26399 104 0 104 104 0 8 0 nchpl 144 56688 0 56203 63 40 23 63 0 8 0 uvmvnodes 80 15861 0 0 324 0 324 324 0 8 0 vnodes 216 15861 0 0 882 0 882 882 0 8 0 namei 1024 195271 0 195270 12 11 1 2 0 8 0 percpumem 16 194 0 150 1 0 1 1 0 8 0 kstatmem 264 326 0 300 3 1 2 3 0 8 0 scxspl 216 168405 0 168405 52 51 1 8 1 8 1 plimitpl 152 2532 0 2516 1 0 1 1 0 8 0 sigapl 424 21372 0 21305 11 3 8 8 0 8 0 futexpl 64 187237 0 187235 5 4 1 1 0 8 0 knotepl 120 1321 0 0 19 1 18 18 0 8 0 kqueuepl 216 3679 0 3671 73 71 2 5 0 8 1 pipepl 320 3929 0 3903 130 119 11 13 0 8 8 fdescpl 496 21312 0 21285 5 1 4 5 0 8 0 filepl 152 147080 0 146840 285 266 19 24 0 8 8 lockfpl 104 10539 0 10536 24 22 2 4 0 8 1 lockfspl 48 4311 0 4308 2 1 1 2 0 8 0 sessionpl 144 55 0 38 1 0 1 1 0 8 0 pgrppl 48 392 0 375 1 0 1 1 0 8 0 ucredpl 104 19292 0 19274 1 0 1 1 0 8 0 zombiepl 144 21307 0 21305 4 3 1 1 0 8 0 processpl 1072 21372 0 21305 5 0 5 5 0 8 0 procpl 680 58217 0 58130 23 14 9 10 0 8 0 srpgc 96 4 0 4 2 2 0 1 0 8 0 sosppl 168 150 0 150 25 24 1 1 0 8 1 sockpl 488 49519 0 49382 1082 1055 27 55 0 8 8 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 32 0 0 4 2 2 3 0 8 0 mcl12k 12288 29 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 3 0 3 3 0 8 0 mcl4k 4096 46 0 0 3 0 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 566 0 0 34 12 22 34 0 8 0 mtagpl 96 1285 0 0 20 0 20 20 0 8 0 mbufpl 256 2281 0 0 99 0 99 99 0 8 0 bufpl 288 38370 0 31995 456 0 456 456 0 8 0 anonpl 24 1903055 0 1890993 216 104 112 124 0 186 5 amapchunkpl 152 649005 0 648134 134 93 41 51 0 158 3 amappl16 200 35479 0 35035 153 127 26 38 0 8 0 amappl15 192 16 0 16 1 1 0 1 0 8 0 amappl14 184 257 0 237 3 1 2 2 0 8 0 amappl13 176 26 0 25 1 0 1 1 0 8 0 amappl12 168 22443 0 22412 3 1 2 2 0 8 0 amappl11 160 59 0 44 1 0 1 1 0 8 0 amappl10 152 79 0 67 1 0 1 1 0 8 0 amappl9 144 305 0 304 1 0 1 1 0 8 0 amappl8 136 1093 0 854 10 1 9 9 0 8 0 amappl7 128 184 0 167 2 0 2 2 0 8 0 amappl6 120 658 0 621 6 4 2 2 0 8 0 amappl5 112 627 0 616 1 0 1 1 0 8 0 amappl4 104 1114 0 1058 3 1 2 3 0 8 0 amappl3 96 128303 0 128222 4 1 3 3 0 8 0 amappl2 88 22319 0 22235 3 1 2 3 0 8 0 amappl1 80 85219 0 84672 23 11 12 23 0 8 0 amappl 88 205298 0 205039 8 1 7 7 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 144 0 14 3 0 3 3 0 8 0 uaddrrnd 24 21312 0 21285 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 21312 0 21285 1 0 1 1 0 8 0 vmmpekpl 168 153464 0 153398 4 0 4 4 0 8 0 vmmpepl 168 1248939 0 1246391 497 351 146 149 0 357 15 vmsppl 464 21311 0 21285 5 1 4 5 0 8 0 rwobjpl 56 306317 0 288588 263 12 251 251 0 8 0 pdppl 4096 42632 0 42570 820 750 70 82 0 8 8 pvpl 32 5336877 0 5318807 618 427 191 364 0 265 4 pmappl 248 21311 0 21285 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2473 0 1540 27 0 27 27 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8279f281) at panic+0x17b sys/kern/subr_prf.c:198 __assert(ffffffff82820fac,ffffffff828199c3,2f6,ffffffff8276cb3b) at __assert+0x29 sys/kern/subr_prf.c:157 arptfree(fffffd806bee6630) at arptfree+0x132 sys/netinet/if_ether.c:758 arptimer(ffffffff82c54b60) at arptimer+0x88 sys/netinet/if_ether.c:135 timeout_run(ffffffff82c54b60) at timeout_run+0xd0 sys/kern/kern_timeout.c:640 softclock_thread(ffff800021169540) at softclock_thread+0x124 sys/kern/kern_timeout.c:763 end trace frame: 0x0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020d58ff0) at sched_idle+0x41e sys/kern/kern_sched.c:191 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020d58ff0) at sched_idle+0x41e sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5