panic: kernel diagnostic assertion "len >= 0 &panic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 677 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 71626 96774 0 0 0 1 syz-executor.1 84999 95272 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82579a90) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825ec6cc,ffffffff825d3098,2a5,ffffffff825ab946) at __assert+0x25 sys/kern/subr_prf.c:161 proc_trampoline_mp() at proc_trampoline_mp+0x131 end trace frame: 0x0, count: 11 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 *cpu0: kernel diagnostic assertion "len >= 0 && !M_READONLY(m)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/uipc_mbuf.c", line 1384 cpu1: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 677 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82579a90) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825ec6cc,ffffffff825d3098,2a5,ffffffff825ab946) at __assert+0x25 sys/kern/subr_prf.c:161 proc_trampoline_mp() at proc_trampoline_mp+0x131 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800022c6aa90 rbx 0xffff800020ce9bff rdx 0 rcx 0 rax 0xffff80002c34d510 r8 0x101010101010101 r9 0x8080808080808080 r10 0x540016704692ab r11 0x4c8cec2ff59e0a75 r12 0xffff800020ce9a00 r13 0 r14 0xffffffff828eca00 cpu_info_full_primary+0x2a00 r15 0x1 rip 0xffffffff82237da8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022c6aa80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=71626 stat=onproc flags process=0 proc=0 pri=83, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff80002c34da50,0xffff80002c34d280 process=0xffff80002c1454e0 user=0xffff800022c65000, vmspace=0xfffffd8067e26178 estcpu=33, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40697 425016 45521 0 2 0 syz-executor.5 40697 391520 45521 0 3 0x4000080 fsleep syz-executor.5 33384 208122 45021 0 2 0 syz-executor.2 *96774 71626 51673 0 7 0 syz-executor.1 95272 39738 3059 0 2 0 syz-executor.0 95272 84999 3059 0 7 0x4000000 syz-executor.0 81704 259349 547 0 2 0 syz-executor.6 27820 338450 80962 0 2 0 syz-executor.3 63408 388752 95451 0 2 0 syz-executor.7 63408 178775 95451 0 3 0x4000080 fsleep syz-executor.7 16208 428874 19640 0 2 0 syz-executor.4 45521 494145 94902 0 3 0x82 nanoslp syz-executor.5 3059 346489 94902 0 3 0x82 nanoslp syz-executor.0 19640 141860 94902 0 3 0x82 nanoslp syz-executor.4 8016 516277 0 0 3 0x14200 acct acct 45021 454330 94902 0 3 0x82 nanoslp syz-executor.2 80962 193398 94902 0 3 0x82 nanoslp syz-executor.3 85161 207231 1 0 3 0x100083 ttyin getty 547 300767 94902 0 3 0x82 nanoslp syz-executor.6 4650 132250 0 0 3 0x14280 nfsidl nfsio 33560 220289 0 0 3 0x14280 nfsidl nfsio 98451 465984 0 0 3 0x14280 nfsidl nfsio 823 4513 0 0 3 0x14280 nfsidl nfsio 85022 325359 0 0 3 0x14280 nfsidl nfsio 90297 369945 0 0 3 0x14280 nfsidl nfsio 80346 102686 0 0 3 0x14280 nfsidl nfsio 58281 55977 0 0 3 0x14280 nfsidl nfsio 82025 180003 0 0 3 0x14280 nfsidl nfsio 10422 183853 0 0 3 0x14280 nfsidl nfsio 24029 492636 0 0 3 0x14280 nfsidl nfsio 12177 450949 0 0 3 0x14280 nfsidl nfsio 11390 422379 0 0 3 0x14280 nfsidl nfsio 20676 487127 0 0 3 0x14280 nfsidl nfsio 79276 226282 0 0 3 0x14280 nfsidl nfsio 84461 394549 0 0 3 0x14280 nfsidl nfsio 25661 101214 0 0 3 0x14280 nfsidl nfsio 83034 469420 0 0 3 0x14280 nfsidl nfsio 44703 314163 0 0 3 0x14280 nfsidl nfsio 11259 326334 0 0 3 0x14280 nfsidl nfsio 98240 75787 0 0 3 0x14200 bored sosplice 95451 436460 94902 0 3 0x82 nanoslp syz-executor.7 51673 85880 94902 0 2 0x2 syz-executor.1 94902 122826 33383 0 3 0x82 thrsleep syz-fuzzer 94902 6395 33383 0 3 0x4000082 thrsleep syz-fuzzer 94902 360657 33383 0 3 0x4000082 thrsleep syz-fuzzer 94902 473334 33383 0 3 0x4000082 thrsleep syz-fuzzer 94902 446442 33383 0 3 0x4000082 thrsleep syz-fuzzer 94902 43329 33383 0 3 0x4000082 thrsleep syz-fuzzer 94902 502675 33383 0 3 0x4000082 thrsleep syz-fuzzer 94902 124929 33383 0 3 0x4000082 kqread syz-fuzzer 94902 123291 33383 0 3 0x4000082 thrsleep syz-fuzzer 33383 351242 92552 0 3 0x10008a sigsusp ksh 92552 335788 91896 0 3 0x9a kqread sshd 91896 175150 1 0 3 0x88 kqread sshd 51059 350045 53772 74 3 0x100092 bpf pflogd 53772 440040 1 0 3 0x80 netio pflogd 40061 47318 9042 73 3 0x100090 kqread syslogd 9042 347614 1 0 3 0x100082 netio syslogd 64656 124510 1 0 3 0x100080 kqread resolvd 19276 211544 25169 77 3 0x100092 kqread dhcpleased 7947 413841 25169 77 3 0x100092 kqread dhcpleased 25169 204596 1 0 3 0x80 kqread dhcpleased 91215 390572 0 0 3 0x14200 bored smr 95135 124958 0 0 2 0x14200 zerothread 81231 521498 0 0 3 0x14200 aiodoned aiodoned 22351 114054 0 0 3 0x14200 syncer update 32886 295640 0 0 3 0x14200 cleaner cleaner 11505 59957 0 0 3 0x14200 reaper reaper 35167 52235 0 0 3 0x14200 pgdaemon pagedaemon 80832 341617 0 0 3 0x14200 bored viomb 94761 414030 0 0 3 0x40014200 acpi0 acpi0 48540 204700 0 0 3 0x40014200 idle1 52470 42865 0 0 3 0x14200 bored softnet 59127 213274 0 0 3 0x14200 bored systqmp 40564 236042 0 0 3 0x14200 bored systq 4118 257308 0 0 3 0x40014200 bored softclock 69467 518042 0 0 3 0x40014200 idle0 1 461038 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 95272 (syz-executor.0) thread 0xffff8000211437a8 (84999) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82ac44c8) #0 witness_lock+0x44d #1 vn_write+0x42 sys/kern/vfs_vnops.c:399 #2 dofilewritev+0x19c sys/kern/sys_generic.c:381 #3 sys_write+0x83 sys/kern/sys_generic.c:301 #4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 6563K 7278K 78643K 32051 0 pcb 13 18K 20K 78643K 1025 0 rtable 253 11K 15K 78643K 1847 0 ifaddr 102 22K 23K 78643K 1264 0 sysctl 2 0K 0K 78643K 2 0 counters 58 35K 36K 78643K 176 0 ioctlops 0 0K 4K 78643K 2943 0 iov 0 0K 24K 78643K 570 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1433 90K 90K 78643K 8111 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 56 0 VM map 2 1K 1K 78643K 2 0 sem 13 5K 10K 78643K 80 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 18 65K 85K 78643K 7651 0 sigio 0 0K 0K 78643K 25 0 proc 70 87K 124K 78643K 1360 0 subproc 104 6K 6K 78643K 376 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 450 0 in_multi 99 6K 6K 78643K 542 0 ether_multi 1 0K 0K 78643K 84 0 mrt 1 0K 0K 78643K 49 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 175 784K 784K 78643K 175 0 exec 0 0K 2K 78643K 1531 0 pfkey data 0 0K 0K 78643K 4 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 7 26K 26K 78643K 7 0 UVM amap 422 337K 338K 78643K 98317 0 UVM aobj 131 8K 8K 78643K 147 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 266 0 NDP 14 0K 2K 78643K 129 0 temp 142 4709K 4837K 78643K 72647 0 kqueue 13 20K 28K 78643K 578 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 120 331 0 328 5 4 1 3 0 8 0 rtentry 112 429 0 322 4 0 4 4 0 8 0 unpcb 136 3037 0 3022 33 32 1 6 0 8 0 syncache 296 28 0 28 7 7 0 1 0 8 0 tcpqe 32 23 0 23 3 3 0 1 0 8 0 tcpcb 736 3431 0 3427 97 90 7 17 0 8 6 arp 120 72 0 54 1 0 1 1 0 8 0 inpcb 304 7758 0 7751 99 90 9 16 0 8 8 rttmr 72 19 0 19 4 4 0 1 0 8 0 nd6 48 96 0 67 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 2 0 1 0 8 0 kcovpl 48 28 0 20 1 0 1 1 0 8 0 ppxss 1248 23 0 23 6 6 0 1 0 8 0 pfstscr 40 9 0 9 3 3 0 1 0 8 0 pffrag 232 27 0 24 2 1 1 1 0 482 0 pffrnode 88 27 0 24 2 1 1 1 0 8 0 pffrent 40 138 0 135 2 1 1 1 0 8 0 pfosfp 40 1434 0 1009 5 0 5 5 0 8 0 pfosfpen 112 1434 0 714 21 0 21 21 0 8 0 pfrktable 1344 250 0 244 5 4 1 2 0 8 0 pftag 88 103 0 98 4 3 1 1 0 8 0 pfstitem 24 74 0 72 1 0 1 1 0 8 0 pfstkey 112 98 0 96 2 1 1 2 0 8 0 pfstate 320 85 0 83 4 3 1 4 0 8 0 pfrule 1360 480 0 438 5 1 4 4 0 8 0 art_heap8 4096 4 0 3 3 2 1 3 0 8 0 art_heap4 256 1665 0 1191 40 10 30 31 0 8 0 art_table 32 1669 0 1194 4 0 4 4 0 8 0 art_node 16 428 0 334 1 0 1 1 0 8 0 sysvmsgpl 40 85 0 51 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 71 0 60 1 0 1 1 0 8 0 shmpl 112 144 0 16 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 12389 0 10941 92 0 92 92 0 8 0 ffsino 272 12389 0 10941 98 0 98 98 0 8 0 nchpl 144 23250 0 21625 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 75103 0 75103 2 1 1 2 0 8 1 percpumem 16 100 0 59 1 0 1 1 0 8 0 vcpupl 2048 49 0 0 7 0 7 7 0 8 0 vmpool 560 55 0 6 4 0 4 4 0 8 0 pfiaddrpl 120 76 0 71 4 3 1 1 0 8 0 scsiplug 72 10 0 10 3 3 0 1 0 8 0 scxspl 216 63555 0 63555 21 20 1 8 0 8 1 plimitpl 152 861 0 846 1 0 1 1 0 8 0 sigapl 424 7938 0 7871 8 0 8 8 0 8 0 futexpl 64 79566 0 79564 1 0 1 1 0 8 0 knotepl 120 444 0 0 9 2 7 7 0 8 0 kqueuepl 216 1322 0 1313 18 17 1 5 0 8 0 pipepl 336 1577 0 1549 52 49 3 11 0 8 0 fdescpl 496 7902 0 7871 5 1 4 5 0 8 0 filepl 152 48346 0 48105 72 58 14 19 0 8 4 lockfpl 104 8251 0 8248 16 15 1 4 0 8 0 lockfspl 48 3834 0 3831 3 2 1 2 0 8 0 sessionpl 144 46 0 29 1 0 1 1 0 8 0 pgrppl 48 46 0 29 1 0 1 1 0 8 0 ucredpl 96 5103 0 5091 1 0 1 1 0 8 0 zombiepl 144 7871 0 7871 2 1 1 1 0 8 1 processpl 1064 7938 0 7871 5 0 5 5 0 8 0 procpl 672 22448 0 22370 18 10 8 9 0 8 0 srpgc 96 35 0 35 6 6 0 1 0 8 0 sosppl 168 47 0 47 4 4 0 1 0 8 0 sockpl 480 11135 0 11110 245 233 12 29 0 8 8 mcl64k 65536 25 0 0 4 1 3 3 0 8 0 mcl16k 16384 33 0 0 5 2 3 3 0 8 0 mcl12k 12288 26 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 360 0 0 34 0 34 34 0 8 0 mtagpl 96 1365 0 0 33 0 33 33 0 8 0 mbufpl 256 1667 0 0 100 0 100 100 0 8 0 bufpl 288 15914 0 9578 453 0 453 453 0 8 0 anonpl 24 2177754 0 2159266 221 94 127 171 0 186 0 amapchunkpl 152 235708 0 234885 63 27 36 48 0 158 0 amappl16 200 19452 0 18824 94 59 35 59 0 8 1 amappl15 192 3358 0 3347 1 0 1 1 0 8 0 amappl14 184 56 0 51 1 0 1 1 0 8 0 amappl13 176 1049 0 1045 1 0 1 1 0 8 0 amappl12 168 635 0 631 1 0 1 1 0 8 0 amappl11 160 222 0 203 1 0 1 1 0 8 0 amappl10 152 576 0 567 1 0 1 1 0 8 0 amappl9 144 1899 0 1895 1 0 1 1 0 8 0 amappl8 136 1717 0 1617 4 0 4 4 0 8 0 amappl7 128 790 0 780 1 0 1 1 0 8 0 amappl6 120 1700 0 1674 2 1 1 2 0 8 0 amappl5 112 8100 0 8077 1 0 1 1 0 8 0 amappl4 104 1815 0 1782 2 1 1 2 0 8 0 amappl3 96 2690 0 2677 1 0 1 1 0 8 0 amappl2 88 1974 0 1924 7 5 2 3 0 8 0 amappl1 80 141736 0 141168 19 5 14 19 0 8 0 amappl 88 97350 0 97077 8 0 8 8 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 72 146 0 16 3 0 3 3 0 8 0 uaddrrnd 24 7957 0 7877 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7957 0 7877 1 0 1 1 0 8 0 vmmpekpl 168 62882 0 62812 4 0 4 4 0 8 0 vmmpepl 168 720075 0 717297 227 92 135 145 0 357 6 vmsppl 368 7956 0 7877 9 1 8 8 0 8 0 rwobjpl 56 176938 0 169219 118 7 111 115 0 8 0 pdppl 4096 15921 0 15803 369 251 118 118 0 8 0 pvpl 32 3703269 0 3680334 386 181 205 271 0 265 0 pmappl 248 7956 0 7877 6 1 5 5 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1382 0 410 28 0 28 28 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff828ebff0) 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 __mp_lock(ffffffff82ac42c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ac42c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f cnputc(26) at cnputc+0x4b sys/dev/cons.c:239 db_putchar(26) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068 db_printf(ffffffff825f2af2) at db_printf+0x85 sys/kern/subr_prf.c:502 panic(ffffffff82579a90) at panic+0xd7 sys/kern/subr_prf.c:220 __assert(ffffffff825ec6cc,ffffffff82560ab1,568,ffffffff8258f284) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd807433ce00,ffffffd8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff8000289081e8,ffff800000c9aa00,ffff800028907f48,ffff800028907e48) at bpf_movein+0x25e sys/net/bpf.c:228 end trace frame: 0xffff800028907fa0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff828ebff0) 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 __mp_lock(ffffffff82ac42c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82ac42c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f cnputc(26) at cnputc+0x4b sys/dev/cons.c:239 db_putchar(26) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068 db_printf(ffffffff825f2af2) at db_printf+0x85 sys/kern/subr_prf.c:502 panic(ffffffff82579a90) at panic+0xd7 sys/kern/subr_prf.c:220 __assert(ffffffff825ec6cc,ffffffff82560ab1,568,ffffffff8258f284) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd807433ce00,ffffffd8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff8000289081e8,ffff800000c9aa00,ffff800028907f48,ffff800028907e48) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(31700,ffff8000289081e8,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff800028908040) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8065a4e790,ffff8000289081e8,1,fffffd807f7d86c0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80635fad18,ffff8000289081e8,0) at vn_write+0x157 sys/kern/vfs_vnops.c:414 dofilewritev(ffff8000211437a8,3,ffff8000289081e8,0,ffff8000289082e0) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_write(ffff8000211437a8,ffff800028908288,ffff8000289082e0) at sys_write+0x83 sys/kern/sys_generic.c:301 syscall(ffff800028908350) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800028908350) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3f82ec355f0, count: -22 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82579a90) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825ec6cc,ffffffff825d3098,2a5,ffffffff825ab946) at __assert+0x25 sys/kern/subr_prf.c:161 proc_trampoline_mp() at proc_trampoline_mp+0x131 end trace frame: 0x0, count: 11 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82579a90) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825ec6cc,ffffffff825d3098,2a5,ffffffff825ab946) at __assert+0x25 sys/kern/subr_prf.c:161 proc_trampoline_mp() at proc_trampoline_mp+0x131 end trace frame: 0x0, count: -4