kernel: protection fault trap, code=0 Stopped at in6_addmulti+0xc4: movzbl 0x1(%rax),%ebx ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace in6_addmulti(ffff80002fe5ea88,ffff800000cfc800,ffff80002fe5eb1c) at in6_addmulti+0xc4 sys/netinet6/in6.c:1037 in6_update_ifa(ffff800000cfc800,ffff80002fe5eb90,0) at in6_update_ifa+0x1418 in6_joingroup sys/netinet6/in6.c:1154 [inline] in6_update_ifa(ffff800000cfc800,ffff80002fe5eb90,0) at in6_update_ifa+0x1418 sys/netinet6/in6.c:776 in6_ifattach_linklocal(ffff800000cfc800,0) at in6_ifattach_linklocal+0x28d sys/netinet6/in6_ifattach.c:281 in6_ifattach(ffff800000cfc800) at in6_ifattach+0x1bb sys/netinet6/in6_ifattach.c:405 ifnewlladdr(ffff800000cfc800) at ifnewlladdr+0x180 sys/net/if.c:3204 ifioctl(fffffd806d7f0d70,8020691f,ffff80002fe5edf0,ffff8000212978a8) at ifioctl+0x1f5e sys/net/if.c:2253 sys_ioctl(ffff8000212978a8,ffff80002fe5ef08,ffff80002fe5ef50) at sys_ioctl+0x4a2 syscall(ffff80002fe5efd0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe5efd0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2653fea4810, count: -9 ddb{1}> show registers rdi 0xffff80002636a000 rsi 0x6ead __ALIGN_SIZE+0x5ead rbp 0xffff80002fe5e970 rbx 0 rdx 0xffff80002636a000 rcx 0x6eac __ALIGN_SIZE+0x5eac rax 0xdeaf0036deaf4152 r8 0x2 r9 0 r10 0xfb723dcfbf9e70a9 r11 0x2c7a71edb4f56b7a r12 0xffff800000caf000 r13 0xffff80002fe5ea88 r14 0xffff80002fe5eb1c r15 0xffff800000cfc800 rip 0xffffffff810e3c54 in6_addmulti+0xc4 cs 0x8 rflags 0x10286 __ALIGN_SIZE+0xf286 rsp 0xffff80002fe5e7f0 ss 0x10 in6_addmulti+0xc4: movzbl 0x1(%rax),%ebx ddb{1}> show proc PROC (syz-executor.4) pid=395985 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=67, nice=20 forw=0xffffffffffffffff, list=0xffff8000212962e8,0xffff800021254860 process=0xffff80002128bab8 user=0xffff80002fe5a000, vmspace=0xfffffd8008a06c08 estcpu=17, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 75213 170209 64252 0 2 0 syz-executor.5 75213 456110 64252 0 3 0x4000080 fsleep syz-executor.5 75213 369619 64252 0 3 0x4000080 fsleep syz-executor.5 75213 13184 64252 0 2 0x4000000 syz-executor.5 1273 470648 11511 0 2 0 syz-executor.0 1273 92383 11511 0 3 0x4000080 fsleep syz-executor.0 1273 342981 11511 0 2 0x4000080 syz-executor.0 17191 417789 97701 0 2 0 syz-executor.2 17191 396005 97701 0 3 0x4000080 fsleep syz-executor.2 17191 514537 97701 0 3 0x4000080 fsleep syz-executor.2 6650 100459 41460 0 2 0 syz-executor.3 6650 118686 41460 0 3 0x4000080 netio syz-executor.3 6650 425835 41460 0 3 0x4000080 fsleep syz-executor.3 77473 36056 98543 0 2 0 syz-executor.4 77473 140392 98543 0 3 0x4000000 smrbar syz-executor.4 *77473 395985 98543 0 7 0x4000000 syz-executor.4 25933 396642 21649 0 2 0x81000 syz-executor.7 25933 290559 21649 0 3 0x4003000 suspend syz-executor.7 81081 166199 26373 0 2 0 syz-executor.1 81081 179457 26373 0 3 0x4000080 fsleep syz-executor.1 81081 466174 26373 0 2 0x4000000 syz-executor.1 48114 92974 0 0 3 0x14200 bored sosplice 26373 338152 75491 0 3 0x82 nanoslp syz-executor.1 20908 225144 53753 0 3 0x100082 netio arp 1546 78964 75491 0 2 0x482 syz-executor.6 21649 69968 75491 0 3 0x82 nanoslp syz-executor.7 64252 170668 75491 0 3 0x82 nanoslp syz-executor.5 53753 221414 1 0 3 0x10008a sigsusp sh 41460 141096 75491 0 2 0x2 syz-executor.3 98543 513783 75491 0 3 0x82 nanoslp syz-executor.4 97701 72026 75491 0 3 0x82 nanoslp syz-executor.2 11511 292397 75491 0 3 0x82 nanoslp syz-executor.0 75491 13174 77817 0 3 0x82 wait syz-fuzzer 75491 349046 77817 0 3 0x4000082 nanoslp syz-fuzzer 75491 452219 77817 0 3 0x4000082 thrsleep syz-fuzzer 75491 509908 77817 0 3 0x4000082 wait syz-fuzzer 75491 147316 77817 0 3 0x4000082 thrsleep syz-fuzzer 75491 239574 77817 0 3 0x4000082 wait syz-fuzzer 75491 503087 77817 0 3 0x4000082 wait syz-fuzzer 75491 332870 77817 0 3 0x4000082 wait syz-fuzzer 75491 375509 77817 0 2 0x4000002 syz-fuzzer 75491 48226 77817 0 3 0x4000082 wait syz-fuzzer 75491 520346 77817 0 3 0x4000082 thrsleep syz-fuzzer 75491 99278 77817 0 3 0x4000082 thrsleep syz-fuzzer 75491 383447 77817 0 3 0x4000082 wait syz-fuzzer 75491 208484 77817 0 3 0x4000082 wait syz-fuzzer 75491 351575 77817 0 3 0x4000082 thrsleep syz-fuzzer 77817 171776 23436 0 3 0x10008a sigsusp ksh 23436 182141 53893 0 3 0x9a kqread sshd 95264 388223 1 0 3 0x100083 ttyin getty 53893 128752 1 0 3 0x88 kqread sshd 21504 155070 463 74 3 0x1100092 bpf pflogd 463 367901 1 0 3 0x80 netio pflogd 10723 419394 97904 73 7 0x1100010 syslogd 97904 430025 1 0 3 0x100082 netio syslogd 46681 359828 1 0 3 0x100080 kqread resolvd 94578 207076 29919 77 3 0x100092 kqread dhcpleased 61781 66739 29919 77 3 0x100092 kqread dhcpleased 29919 127458 1 0 3 0x80 kqread dhcpleased 62507 196204 0 0 3 0x14200 bored smr 73428 143602 0 0 2 0x14200 zerothread 54147 475087 0 0 3 0x14200 aiodoned aiodoned 29165 482237 0 0 3 0x14200 syncer update 86099 283867 0 0 3 0x14200 cleaner cleaner 23095 164354 0 0 3 0x14200 reaper reaper 85225 276729 0 0 3 0x14200 pgdaemon pagedaemon 57687 459238 0 0 3 0x14200 bored viomb 46541 207341 0 0 3 0x40014200 acpi0 acpi0 86309 205642 0 0 3 0x40014200 idle1 11937 214037 0 0 3 0x14200 bored softnet 15362 416979 0 0 3 0x14200 bored softnet 85982 507836 0 0 3 0x14200 bored softnet 21623 255767 0 0 3 0x14200 bored softnet 20022 187329 0 0 2 0x14200 systqmp 51322 174912 0 0 3 0x14200 bored systq 35709 249389 0 0 3 0x40014200 bored softclock 94465 203910 0 0 3 0x40014200 idle0 1 241872 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 77473 (syz-executor.4) thread 0xffff800021254b08 (140392) exclusive rwlock clonelk r = 0 (0xffffffff82b495e0) #0 witness_lock+0x44d #1 if_clone_destroy+0x49 #2 ifioctl+0x3b4 sys/net/if.c:1924 #3 sys_ioctl+0x4a2 #4 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #4 syscall+0x606 sys/arch/amd64/amd64/trap.c:625 #5 Xsyscall+0x128 Process 77473 (syz-executor.4) thread 0xffff8000212978a8 (395985) exclusive rwlock netlock r = 0 (0xffffffff82b49670) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 ifioctl+0x14e2 sys/net/if.c:2235 #3 sys_ioctl+0x4a2 #4 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #4 syscall+0x606 sys/arch/amd64/amd64/trap.c:625 #5 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82db6228) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3bb sys/kern/sched_bsd.c:405 #3 sleep_finish+0x180 sys/kern/kern_synch.c:417 #4 rw_enter+0x35a sys/kern/kern_rwlock.c:286 #5 ifioctl+0x14e2 sys/net/if.c:2235 #6 sys_ioctl+0x4a2 #7 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #7 syscall+0x606 sys/arch/amd64/amd64/trap.c:625 #8 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10208 6495K 6614K 78643K 11505 0 pcb 13 8K 8K 78643K 28 0 rtable 220 7K 7K 78643K 397 0 ifaddr 78 25K 26K 78643K 109 0 counters 60 35K 36K 78643K 76 0 ioctlops 0 0K 4K 78643K 1485 0 iov 0 0K 0K 78643K 4 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1354 85K 85K 78643K 1414 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 21 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 19 69K 93K 78643K 276 0 sigio 0 0K 0K 78643K 39 0 proc 68 91K 115K 78643K 553 0 subproc 117 7K 7K 78643K 117 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 10 0 in_multi 89 5K 6K 78643K 114 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 405 0 pfkey data 0 0K 0K 78643K 2 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 317 79K 80K 78643K 3757 0 UVM aobj 17 3K 3K 78643K 21 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 13 0K 1K 78643K 34 0 temp 92 5764K 5828K 78643K 14653 0 kqueue 12 18K 22K 78643K 31 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 42 0 38 1 0 1 1 0 8 0 rtentry 112 122 0 22 4 0 4 4 0 8 0 unpcb 144 147 0 127 2 0 2 2 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 235 0 235 2 2 0 1 0 8 0 tcpcb 776 33 0 28 1 0 1 1 0 8 0 arp 120 19 0 3 1 0 1 1 0 8 0 inpcb 368 174 0 162 4 0 4 4 0 8 2 nd6 48 26 0 4 1 0 1 1 0 8 0 pkpcb 40 2 0 2 2 1 1 1 0 8 1 kcovpl 48 9 0 0 1 0 1 1 0 8 0 ppxss 1256 4 0 4 1 1 0 1 0 8 0 pppxif 1456 4 0 4 1 1 0 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 pfanchor 1280 390 0 197 26 4 22 22 0 8 2 pfstitem 24 10 0 7 1 0 1 1 0 8 0 pfstkey 128 10 0 7 1 0 1 1 0 8 0 pfstate 384 10 0 7 1 0 1 1 0 8 0 pfrule 1344 21 0 20 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 547 0 65 31 0 31 31 0 8 0 art_table 32 548 0 65 4 0 4 4 0 8 0 art_node 16 121 0 26 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 15 0 5 1 0 1 1 0 8 0 shmpl 112 18 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1661 0 219 91 0 91 91 0 8 0 ffsino 272 1661 0 219 97 0 97 97 0 8 0 nchpl 144 2119 0 471 63 0 63 63 0 8 0 uvmvnodes 80 1897 0 0 39 0 39 39 0 8 0 vnodes 216 1897 0 0 106 0 106 106 0 8 0 namei 1024 7835 0 7835 4 3 1 2 0 8 1 percpumem 16 51 0 8 1 0 1 1 0 8 0 kstatmem 264 34 0 8 2 0 2 2 0 8 0 scxspl 216 7421 0 7421 14 13 1 8 0 8 1 plimitpl 152 36 0 16 1 0 1 1 0 8 0 sigapl 424 593 0 542 8 2 6 7 0 8 0 futexpl 64 1655 0 1648 2 1 1 1 0 8 0 knotepl 120 184 0 0 6 0 6 6 0 8 0 kqueuepl 216 172 0 161 6 5 1 6 0 8 0 pipepl 320 296 0 265 9 6 3 9 0 8 0 fdescpl 496 575 0 543 5 0 5 5 0 8 0 filepl 152 3282 0 3011 23 9 14 20 0 8 2 lockfpl 104 106 0 102 1 0 1 1 0 8 0 lockfspl 48 55 0 51 1 0 1 1 0 8 0 sessionpl 144 25 0 7 1 0 1 1 0 8 0 pgrppl 48 25 0 7 1 0 1 1 0 8 0 ucredpl 104 131 0 119 1 0 1 1 0 8 0 zombiepl 144 544 0 542 2 1 1 1 0 8 0 processpl 1072 593 0 542 4 0 4 4 0 8 0 procpl 696 902 0 823 8 0 8 8 0 8 0 sosppl 168 3 0 3 1 1 0 1 0 8 0 sockpl 488 365 0 329 9 0 9 9 0 8 4 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 357 0 0 44 0 44 44 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 1059 0 0 62 0 62 62 0 8 0 bufpl 288 4218 0 150 291 0 291 291 0 8 0 anonpl 24 162676 0 144458 122 6 116 117 0 186 2 amapchunkpl 152 10338 0 9494 35 0 35 35 0 158 1 amappl16 200 3030 0 2518 32 2 30 30 0 8 2 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 169 0 153 2 1 1 2 0 8 0 amappl13 176 8 0 7 1 0 1 1 0 8 0 amappl12 168 435 0 430 1 0 1 1 0 8 0 amappl11 160 60 0 45 1 0 1 1 0 8 0 amappl10 152 41 0 31 1 0 1 1 0 8 0 amappl9 144 969 0 969 2 2 0 1 0 8 0 amappl8 136 158 0 118 2 0 2 2 0 8 0 amappl7 128 172 0 144 2 0 2 2 0 8 0 amappl6 120 168 0 155 2 1 1 2 0 8 0 amappl5 112 136 0 127 1 0 1 1 0 8 0 amappl4 104 518 0 485 2 0 2 2 0 8 0 amappl3 96 1078 0 1013 2 0 2 2 0 8 0 amappl2 88 928 0 844 4 2 2 4 0 8 0 amappl1 80 15518 0 14641 30 11 19 28 0 8 0 amappl 88 3231 0 3024 6 1 5 5 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 20 0 4 1 0 1 1 0 8 0 uaddrrnd 24 575 0 543 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 575 0 543 1 0 1 1 0 8 0 vmmpekpl 168 11304 0 11247 3 0 3 3 0 8 0 vmmpepl 168 63741 0 60728 160 22 138 138 0 357 5 vmsppl 440 574 0 543 6 2 4 5 0 8 0 rwobjpl 56 20743 0 17011 54 0 54 54 0 8 0 pdppl 4096 1157 0 1086 139 66 73 83 0 8 2 pvpl 32 400660 0 375854 380 175 205 366 0 265 2 pmappl 248 574 0 543 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 775 0 72 21 0 21 21 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82b24ff0) at x86_ipi_db+0x1a 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+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x16 kd_curproc sys/dev/kcov.c:574 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x16 sys/dev/kcov.c:148 __mp_lock(ffffffff82db6020) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82db6020) at __mp_lock+0x133 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff82db6020) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82db6020) at __mp_lock+0x122 sys/kern/kern_lock.c:147 vn_write(fffffd806fb78000,ffff80002124f7a0,0) at vn_write+0x42 sys/kern/vfs_vnops.c:393 dofilewritev(ffff8000211bd058,e,ffff80002124f7a0,0,ffff80002124f890) at dofilewritev+0x19c sys/kern/sys_generic.c:375 sys_writev(ffff8000211bd058,ffff80002124f840,ffff80002124f890) at sys_writev+0xa7 sys/kern/sys_generic.c:322 syscall(ffff80002124f910) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002124f910) at syscall+0x606 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd0800, count: -13 ddb{0}> machine ddbcpu 1 Stopped at in6_addmulti+0xc4: movzbl 0x1(%rax),%ebx ddb{1}> trace in6_addmulti(ffff80002fe5ea88,ffff800000cfc800,ffff80002fe5eb1c) at in6_addmulti+0xc4 sys/netinet6/in6.c:1037 in6_update_ifa(ffff800000cfc800,ffff80002fe5eb90,0) at in6_update_ifa+0x1418 in6_joingroup sys/netinet6/in6.c:1154 [inline] in6_update_ifa(ffff800000cfc800,ffff80002fe5eb90,0) at in6_update_ifa+0x1418 sys/netinet6/in6.c:776 in6_ifattach_linklocal(ffff800000cfc800,0) at in6_ifattach_linklocal+0x28d sys/netinet6/in6_ifattach.c:281 in6_ifattach(ffff800000cfc800) at in6_ifattach+0x1bb sys/netinet6/in6_ifattach.c:405 ifnewlladdr(ffff800000cfc800) at ifnewlladdr+0x180 sys/net/if.c:3204 ifioctl(fffffd806d7f0d70,8020691f,ffff80002fe5edf0,ffff8000212978a8) at ifioctl+0x1f5e sys/net/if.c:2253 sys_ioctl(ffff8000212978a8,ffff80002fe5ef08,ffff80002fe5ef50) at sys_ioctl+0x4a2 syscall(ffff80002fe5efd0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002fe5efd0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2653fea4810, count: -9