panic: kernel diagnostic assertion "curproc->p_kd == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/dev/kcov.c", line 519 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 514551 26976 73 0x100010 0 0 syslogd *360189 14771 0 0x14000 0x200 1 softnet db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823c07fb) at panic+0x15e sys/kern/subr_prf.c:218 __assert(ffffffff8242e1df,ffffffff82429222,207,ffffffff823ce86e) at __assert+0x2b sys/kern/subr_prf.c:162 kcov_remote_enter(0,ffff800020ec4bd8) at kcov_remote_enter+0x155 sys/dev/kcov.c:519 taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447 end trace frame: 0x0, count: 10 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 kernel diagnostic assertion "curproc->p_kd == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/dev/kcov.c", line 519 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823c07fb) at panic+0x15e sys/kern/subr_prf.c:218 __assert(ffffffff8242e1df,ffffffff82429222,207,ffffffff823ce86e) at __assert+0x2b sys/kern/subr_prf.c:162 kcov_remote_enter(0,ffff800020ec4bd8) at kcov_remote_enter+0x155 sys/dev/kcov.c:519 taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447 end trace frame: 0x0, count: -5 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020db9cb0 rbx 0xffff800020db9cc0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff800020db9c70 r9 0xffffffff814cffb6 kprintf+0x146 r10 0x1 r11 0x559822f4eb52c7ca r12 0x3000000008 r13 0xffff800020db9d60 r14 0x100 r15 0x1 rip 0xffffffff8178dc98 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020db9ca0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (softnet) pid=360189 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020d98768,0xffff800020d98288 process=0xffff800020d9b3b0 user=0xffff800020db4000, vmspace=0xffffffff828e8b68 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20722 106720 96130 0 2 0x2 syz-executor.1 77166 433287 0 0 3 0x14280 nfsidl nfsio 61957 232054 0 0 3 0x14280 nfsidl nfsio 38926 285097 0 0 3 0x14280 nfsidl nfsio 46142 373687 0 0 3 0x14280 nfsidl nfsio 84256 337494 0 0 3 0x14280 nfsidl nfsio 28180 226022 0 0 3 0x14280 nfsidl nfsio 43021 446620 0 0 3 0x14280 nfsidl nfsio 71266 356600 0 0 3 0x14280 nfsidl nfsio 88536 312922 0 0 3 0x14280 nfsidl nfsio 69147 468983 0 0 3 0x14280 nfsidl nfsio 45849 134833 0 0 3 0x14280 nfsidl nfsio 20110 25307 0 0 3 0x14280 nfsidl nfsio 15646 439697 0 0 3 0x14280 nfsidl nfsio 61141 86801 0 0 3 0x14280 nfsidl nfsio 20645 447391 0 0 3 0x14280 nfsidl nfsio 73967 508003 0 0 3 0x14280 nfsidl nfsio 25132 106867 0 0 3 0x14280 nfsidl nfsio 79613 502711 0 0 3 0x14280 nfsidl nfsio 44825 460124 0 0 3 0x14280 nfsidl nfsio 89436 208533 0 0 3 0x14280 nfsidl nfsio 4824 154991 0 0 3 0x14200 bored sosplice 20043 473591 1 0 3 0x100083 ttyin getty 96130 251360 61995 0 3 0x82 thrsleep syz-fuzzer 96130 177356 61995 0 3 0x4000082 nanosleep syz-fuzzer 96130 447200 61995 0 3 0x4000082 kqread syz-fuzzer 96130 237087 61995 0 3 0x4000082 thrsleep syz-fuzzer 96130 384298 61995 0 3 0x4000082 thrsleep syz-fuzzer 96130 23804 61995 0 3 0x4000082 thrsleep syz-fuzzer 96130 84471 61995 0 3 0x4000082 thrsleep syz-fuzzer 96130 53429 61995 0 3 0x4000082 thrsleep syz-fuzzer 61995 5676 47685 0 3 0x10008a pause ksh 47685 280143 97833 0 3 0x92 select sshd 97833 335522 1 0 3 0x80 select sshd 75786 324328 83004 74 3 0x100092 bpf pflogd 83004 370348 1 0 3 0x80 netio pflogd 26976 514551 46013 73 7 0x100010 syslogd 46013 420494 1 0 3 0x100082 netio syslogd 43105 410884 1 77 3 0x100090 poll dhclient 9052 147898 1 0 3 0x80 poll dhclient 29246 413235 0 0 3 0x14200 bored smr 43502 139933 0 0 2 0x14200 zerothread 6472 438134 0 0 3 0x14200 aiodoned aiodoned 87342 127538 0 0 3 0x14200 syncer update 70549 258079 0 0 3 0x14200 cleaner cleaner 32058 454414 0 0 3 0x14200 reaper reaper 93204 504179 0 0 3 0x14200 pgdaemon pagedaemon 30845 197525 0 0 3 0x14200 bored crynlk 85256 10198 0 0 3 0x14200 bored crypto 2257 260560 0 0 3 0x40014200 acpi0 acpi0 4863 439018 0 0 3 0x40014200 idle1 *14771 360189 0 0 7 0x14200 softnet 39657 512404 0 0 3 0x14200 bored systqmp 10429 229370 0 0 3 0x14200 bored systq 73579 158546 0 0 3 0x40014200 bored softclock 60635 512540 0 0 3 0x40014200 idle0 1 70692 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &map->mtx r = 0 (0xffffffff827cb378) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 vm_map_lock_ln+0x118 sys/uvm/uvm_map.c:5454 #4 uvm_map+0x325 sys/uvm/uvm_map.c:1236 #5 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335 #6 malloc+0x43e sys/kern/kern_malloc.c:230 #7 ufs_readdir+0x148 sys/ufs/ufs/ufs_vnops.c:1456 #8 VOP_READDIR+0xc6 sys/kern/vfs_vops.c:520 #9 sys_getdents+0x21d sys/kern/vfs_syscalls.c:3121 #10 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570 #11 Xsyscall+0x128 CPU 1: exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:92 r = 0 (0xffffffff826ce048) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 kcov_remote_enter+0x62 kr_lookup sys/dev/kcov.c:676 [inline] #3 kcov_remote_enter+0x62 sys/dev/kcov.c:513 #4 taskq_thread+0xd9 sys/kern/kern_task.c:447 #5 proc_trampoline+0x1c Process 20722 (syz-executor.1) thread 0xffff800020e4c2b0 (106720) Process 26976 (syslogd) thread 0xffff8000fffff3d0 (514551) Process 14771 (softnet) thread 0xffff800020d984f0 (360189) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9538 6441K 7206K 78643K 17690 0 pcb 13 8K 8K 78643K 418 0 rtable 85 3K 7K 78643K 1616 0 ifaddr 83 16K 16K 78643K 547 0 counters 45 34K 34K 78643K 173 0 ioctlops 0 0K 4K 78643K 2107 0 iov 0 0K 24K 78643K 392 0 mount 1 1K 1K 78643K 1 0 vnodes 1227 77K 77K 78643K 3749 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 108 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 90 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 4 9K 25K 78643K 7275 0 sigio 0 0K 0K 78643K 119 0 proc 64 63K 95K 78643K 1189 0 subproc 32 2K 2K 78643K 102 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 453 0 in_multi 26 1K 2K 78643K 380 0 ether_multi 1 0K 0K 78643K 84 0 mrt 0 0K 0K 78643K 86 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 2K 78643K 758 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 446 1264K 1272K 78643K 17941 0 UVM aobj 131 8K 8K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 272 0 NDP 15 0K 0K 78643K 121 0 temp 145 3963K 4092K 78643K 44964 0 kqueue 3 4K 22K 78643K 380 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 arp 64 19 0 13 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 96 296 0 294 1 0 1 1 0 8 0 rtentry 112 196 0 165 2 0 2 2 0 8 0 unpcb 120 2103 0 2087 1 0 1 1 0 8 0 syncache 272 51 0 51 7 7 0 1 0 8 0 tcpqe 32 17 0 17 5 5 0 1 0 8 0 tcpcb 592 1425 0 1413 23 21 2 5 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 296 3610 0 3601 7 5 2 2 0 8 0 rttmr 72 25 0 25 3 3 0 1 0 8 0 nd6 48 55 0 51 1 0 1 1 0 8 0 pkpcb 40 36 0 36 5 5 0 1 0 8 0 kcovpl 48 6 0 4 1 0 1 1 0 8 0 ppxss 1136 14 0 14 2 1 1 1 0 8 1 pfstscr 40 26 0 26 2 2 0 1 0 8 0 pffrag 232 19 0 19 4 3 1 1 0 482 1 pffrnode 88 19 0 19 4 3 1 1 0 8 1 pffrent 40 51 0 51 6 5 1 1 0 8 1 pfosfp 40 847 0 423 5 0 5 5 0 8 0 pfosfpen 112 1436 0 714 21 0 21 21 0 8 0 pfrktable 1344 214 0 214 3 3 0 1 0 8 0 pftag 88 3 0 1 1 0 1 1 0 8 0 pfqueue 264 10 0 5 1 0 1 1 0 8 0 pfstitem 24 89 0 87 1 0 1 1 0 8 0 pfstkey 112 131 0 129 2 1 1 2 0 8 0 pfstate 328 110 0 108 7 6 1 5 0 8 0 pfrule 1360 82 0 76 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 781 0 644 17 5 12 17 0 8 1 art_table 32 782 0 644 3 1 2 3 0 8 0 art_node 16 192 0 166 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 0 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 81 0 71 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 10881 0 9472 92 3 89 89 0 8 0 ffsino 272 10881 0 9472 95 0 95 95 0 8 0 nchpl 144 19787 0 18194 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 50220 0 50220 2 1 1 1 0 8 1 percpumem 16 97 0 64 1 0 1 1 0 8 0 vcpupl 1984 78 0 0 10 0 10 10 0 8 0 vmpool 560 95 0 17 6 0 6 6 0 8 0 pfiaddrpl 120 59 0 59 2 2 0 1 0 8 0 scsiplug 72 7 0 7 1 1 0 1 0 8 0 scxspl 200 60470 0 60470 14 13 1 7 0 8 1 plimitpl 152 391 0 383 1 0 1 1 0 8 0 sigapl 424 7500 0 7449 6 0 6 6 0 8 0 futexpl 56 56490 0 56490 3 2 1 1 0 8 1 knotepl 112 650 0 630 2 1 1 2 0 8 0 kqueuepl 152 3243 0 3241 1 0 1 1 0 8 0 pipepl 304 535 0 524 13 11 2 2 0 8 0 fdescpl 496 7464 0 7449 3 0 3 3 0 8 0 filepl 152 27641 0 27538 8 3 5 6 0 8 0 lockfpl 104 899 0 898 1 0 1 1 0 8 0 lockfspl 48 323 0 322 1 0 1 1 0 8 0 sessionpl 120 23 0 12 1 0 1 1 0 8 0 pgrppl 48 59 0 48 1 0 1 1 0 8 0 ucredpl 96 4091 0 4082 1 0 1 1 0 8 0 zombiepl 144 7450 0 7449 2 1 1 1 0 8 0 processpl 1008 7500 0 7449 7 0 7 7 0 8 0 procpl 632 16647 0 16589 8 2 6 6 0 8 0 sosppl 144 97 0 97 7 6 1 1 0 8 1 sockpl 400 6051 0 6024 15 11 4 5 0 8 1 mcl64k 65536 21 0 0 3 0 3 3 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 314 0 0 16 0 16 16 0 8 0 mtagpl 96 477 0 0 12 0 12 12 0 8 0 mbufpl 256 1339 0 0 74 0 74 74 0 8 0 bufpl 280 15408 0 9150 448 0 448 448 0 8 0 anonpl 16 569346 0 561794 86 41 45 55 0 124 14 amapchunkpl 152 29989 0 29788 26 13 13 21 0 158 4 amappl16 192 25932 0 25605 63 40 23 35 0 8 6 amappl15 184 142 0 140 1 0 1 1 0 8 0 amappl14 176 923 0 913 1 0 1 1 0 8 0 amappl13 168 117 0 114 1 0 1 1 0 8 0 amappl12 160 5121 0 5114 1 0 1 1 0 8 0 amappl11 152 68 0 53 1 0 1 1 0 8 0 amappl10 144 331 0 325 1 0 1 1 0 8 0 amappl9 136 282 0 282 1 1 0 1 0 8 0 amappl8 128 410 0 293 4 0 4 4 0 8 0 amappl7 120 616 0 608 1 0 1 1 0 8 0 amappl6 112 166 0 141 1 0 1 1 0 8 0 amappl5 104 6875 0 6861 1 0 1 1 0 8 0 amappl4 96 1264 0 1225 1 0 1 1 0 8 0 amappl3 88 1124 0 1117 1 0 1 1 0 8 0 amappl2 80 57255 0 57171 4 1 3 3 0 8 0 amappl1 72 200456 0 200013 24 14 10 19 0 8 0 amappl 80 17106 0 16945 4 0 4 4 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 7559 0 7466 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7559 0 7466 1 0 1 1 0 8 0 vmmpekpl 168 41176 0 41121 3 0 3 3 0 8 0 vmmpepl 168 913211 0 911455 142 48 94 100 0 357 7 vmsppl 368 7558 0 7466 9 0 9 9 0 8 0 pdppl 4096 15125 0 15010 16 0 16 16 0 8 1 pvpl 32 2441252 0 2430494 269 147 122 141 0 265 32 pmappl 232 7558 0 7466 6 0 6 6 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 362 0 31 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff8274fff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 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+0x6f sys/dev/kcov.c:118 __mp_acquire_count(ffffffff8287d640,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x390 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020e62b80,1) at sleep_finish+0x111 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020e62b80,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020e62b80,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd806edd54a8,11,ffffffff823d28fa,0) at tsleep+0x1c2 sys/kern/kern_synch.c:155 vwaitforio(fffffd806edd5428,0,ffffffff823d28fa,ffffffffffffffff) at vwaitforio+0x98 sys/kern/vfs_subr.c:1878 ffs_fsync(ffff800020e62ce0) at ffs_fsync+0x39d sys/ufs/ffs/ffs_vnops.c:498 VOP_FSYNC(fffffd806edd5428,fffffd807f7bfae0,1,ffff8000fffff3d0) at VOP_FSYNC+0xbf sys/kern/vfs_vops.c:353 sys_fsync(ffff8000fffff3d0,ffff800020e62dd0,ffff800020e62e20) at sys_fsync+0x127 sys/kern/vfs_syscalls.c:2874 syscall(ffff800020e62ea0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e62ea0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570 end trace frame: 0xffff800020e62f20, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8274fff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 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+0x6f sys/dev/kcov.c:118 __mp_acquire_count(ffffffff8287d640,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x390 sys/kern/sched_bsd.c:435 sleep_finish(ffff800020e62b80,1) at sleep_finish+0x111 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020e62b80,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020e62b80,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd806edd54a8,11,ffffffff823d28fa,0) at tsleep+0x1c2 sys/kern/kern_synch.c:155 vwaitforio(fffffd806edd5428,0,ffffffff823d28fa,ffffffffffffffff) at vwaitforio+0x98 sys/kern/vfs_subr.c:1878 ffs_fsync(ffff800020e62ce0) at ffs_fsync+0x39d sys/ufs/ffs/ffs_vnops.c:498 VOP_FSYNC(fffffd806edd5428,fffffd807f7bfae0,1,ffff8000fffff3d0) at VOP_FSYNC+0xbf sys/kern/vfs_vops.c:353 sys_fsync(ffff8000fffff3d0,ffff800020e62dd0,ffff800020e62e20) at sys_fsync+0x127 sys/kern/vfs_syscalls.c:2874 syscall(ffff800020e62ea0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e62ea0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe3120, count: -15 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:398 panic(ffffffff823c07fb) at panic+0x15e sys/kern/subr_prf.c:218 __assert(ffffffff8242e1df,ffffffff82429222,207,ffffffff823ce86e) at __assert+0x2b sys/kern/subr_prf.c:162 kcov_remote_enter(0,ffff800020ec4bd8) at kcov_remote_enter+0x155 sys/dev/kcov.c:519 taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447 end trace frame: 0x0, count: 10 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff823c07fb) at panic+0x15e sys/kern/subr_prf.c:218 __assert(ffffffff8242e1df,ffffffff82429222,207,ffffffff823ce86e) at __assert+0x2b sys/kern/subr_prf.c:162 kcov_remote_enter(0,ffff800020ec4bd8) at kcov_remote_enter+0x155 sys/dev/kcov.c:519 taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447 end trace frame: 0x0, count: -5