uvm_fault(0xffffffff82b29970, 0xffff80001f74fcd8, 0, 2) -> d kernel: page fault trap, code=0 Stopped at memset+0x4e: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *356024 75587 0 0 0x4000001 1K syz-executor.3 234400 14604 0 0 0x4000000 0 syz-executor.7 memset() at memset+0x4e ffs_write(ffff800022c5a460) at ffs_write+0x924 VOP_WRITE(fffffd8066b86c00,ffff800022c5a518,3,fffffd807f7d8660) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000292dafc8,fffffd8066b86c00,fffffd807f7d8660,ffff800022c5a5e8,ffff800022c5a5c0) at ktrwriteraw+0x15f sys/kern/kern_ktrace.c:666 ktrsysret(ffff8000292dafc8,141,0,ffff800022c5a700) at ktrsysret+0x17e ktrwrite2 sys/kern/kern_ktrace.c:631 [inline] ktrsysret(ffff8000292dafc8,141,0,ffff800022c5a700) at ktrsysret+0x17e sys/kern/kern_ktrace.c:213 syscall(ffff800022c5a770) at syscall+0x5d5 mi_syscall_return sys/sys/syscall_mi.h:132 [inline] syscall(ffff800022c5a770) at syscall+0x5d5 sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9c345014190, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff82b29970, 0xffff80001f74fcd8, 0, 2) -> d ddb{1}> trace memset() at memset+0x4e ffs_write(ffff800022c5a460) at ffs_write+0x924 VOP_WRITE(fffffd8066b86c00,ffff800022c5a518,3,fffffd807f7d8660) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000292dafc8,fffffd8066b86c00,fffffd807f7d8660,ffff800022c5a5e8,ffff800022c5a5c0) at ktrwriteraw+0x15f sys/kern/kern_ktrace.c:666 ktrsysret(ffff8000292dafc8,141,0,ffff800022c5a700) at ktrsysret+0x17e ktrwrite2 sys/kern/kern_ktrace.c:631 [inline] ktrsysret(ffff8000292dafc8,141,0,ffff800022c5a700) at ktrsysret+0x17e sys/kern/kern_ktrace.c:213 syscall(ffff800022c5a770) at syscall+0x5d5 mi_syscall_return sys/sys/syscall_mi.h:132 [inline] syscall(ffff800022c5a770) at syscall+0x5d5 sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9c345014190, count: -7 ddb{1}> show registers rdi 0xffff80001f74fcd8 rsi 0 rbp 0xffff800022c5a380 rbx 0x1 rdx 0 rcx 0x65 rax 0 r8 0x328 r9 0xffff800022c5a2d8 r10 0xec097a2e74d278a1 r11 0xffff80001f74fcd8 r12 0xcd8 r13 0xfffffd8066b7a018 r14 0x1000 __ALIGN_SIZE r15 0xfffffd8066b7a000 rip 0xffffffff81633bae memset+0x4e cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff800022c5a188 ss 0x10 memset+0x4e: repe stosq %es:(%rdi) ddb{1}> show proc PROC (syz-executor.3) pid=356024 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff8000292da7e8,0xffffffff829e0210 process=0xffff800024645910 user=0xffff800022c55000, vmspace=0xfffffd8063104e90 estcpu=33, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20952 119227 38118 0 2 0x10 syz-executor.4 20952 23252 38118 0 3 0x4000090 fsleep syz-executor.4 75587 155151 10676 0 2 0 syz-executor.3 75587 509880 10676 0 2 0x4000000 syz-executor.3 *75587 356024 10676 0 7 0x4000001 syz-executor.3 12911 478949 29775 0 2 0 syz-executor.1 12911 479352 29775 0 2 0x4000000 syz-executor.1 81346 426258 21282 -1 2 0x10 syz-executor.2 81346 135063 21282 -1 3 0x4000090 fsleep syz-executor.2 81346 328575 21282 -1 3 0x4000090 fsleep syz-executor.2 56044 92017 29491 0 2 0 syz-executor.5 56044 302367 29491 0 3 0x4000080 fsleep syz-executor.5 56044 162473 29491 0 3 0x4000080 fsleep syz-executor.5 56044 410042 29491 0 2 0x4000000 syz-executor.5 14604 484645 53619 0 2 0 syz-executor.7 14604 311163 53619 0 3 0x4000080 fsleep syz-executor.7 14604 234400 53619 0 7 0x4000000 syz-executor.7 14604 139954 53619 0 3 0x4000080 fsleep syz-executor.7 94049 293215 13277 0 2 0 syz-executor.6 94049 80306 13277 0 2 0x4000000 syz-executor.6 94049 507897 13277 0 3 0x4000080 fsleep syz-executor.6 94049 166456 13277 0 3 0x4000080 fsleep syz-executor.6 29775 361811 84253 0 3 0x82 nanoslp syz-executor.1 29491 413715 84253 0 3 0x82 nanoslp syz-executor.5 11775 162507 84253 0 2 0x2 syz-executor.0 21282 451286 84253 0 3 0x82 nanoslp syz-executor.2 38118 334861 84253 0 3 0x82 nanoslp syz-executor.4 13277 261323 84253 0 3 0x82 nanoslp syz-executor.6 55931 140812 0 0 3 0x14200 acct acct 91404 455370 0 0 3 0x14200 bored sosplice 53619 69783 84253 0 2 0x482 syz-executor.7 10676 517059 84253 0 3 0x82 nanoslp syz-executor.3 84253 315206 52888 0 3 0x82 thrsleep syz-fuzzer 84253 186520 52888 0 2 0x4000082 syz-fuzzer 84253 430773 52888 0 3 0x4000082 thrsleep syz-fuzzer 84253 102560 52888 0 2 0x4000082 syz-fuzzer 84253 102421 52888 0 3 0x4000082 thrsleep syz-fuzzer 84253 18727 52888 0 3 0x4000082 kqread syz-fuzzer 84253 40960 52888 0 3 0x4000082 thrsleep syz-fuzzer 84253 163957 52888 0 3 0x4000082 thrsleep syz-fuzzer 52888 435946 51488 0 3 0x10008a sigsusp ksh 51488 242620 94736 0 3 0x9a poll sshd 14769 19766 1 0 3 0x100083 ttyin getty 94736 239481 1 0 3 0x88 poll sshd 75786 500827 52599 74 3 0x100092 bpf pflogd 52599 253150 1 0 3 0x80 netio pflogd 94470 140435 93527 73 3 0x100090 kqread syslogd 93527 424253 1 0 3 0x100082 netio syslogd 2006 209402 1 0 3 0x100080 kqread resolvd 1756 125782 54564 77 3 0x100092 kqread dhcpleased 66472 515996 54564 77 3 0x100092 kqread dhcpleased 54564 518097 1 0 3 0x80 kqread dhcpleased 11434 482485 0 0 3 0x14200 bored smr 83474 80512 0 0 2 0x14200 zerothread 49499 189011 0 0 3 0x14200 aiodoned aiodoned 96030 190995 0 0 3 0x14200 syncer update 58889 317607 0 0 3 0x14200 cleaner cleaner 41806 389510 0 0 3 0x14200 reaper reaper 66853 12215 0 0 3 0x14200 pgdaemon pagedaemon 13815 6286 0 0 3 0x14200 bored viomb 24689 50288 0 0 3 0x40014200 acpi0 acpi0 30267 368318 0 0 3 0x40014200 idle1 65988 383960 0 0 3 0x14200 bored softnet 10055 354514 0 0 3 0x14200 bored systqmp 60712 6234 0 0 3 0x14200 bored systq 87063 301989 0 0 2 0x40014200 softclock 28627 169614 0 0 3 0x40014200 idle0 1 458195 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 75587 (syz-executor.3) thread 0xffff8000292dafc8 (356024) exclusive rrwlock inode r = 0 (0xfffffd8066b7a098) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1d3 sys/kern/vfs_subr.c:677 #6 ktrwriteraw+0x130 sys/kern/kern_ktrace.c:663 #7 ktrsysret+0x17e ktrwrite2 sys/kern/kern_ktrace.c:631 [inline] #7 ktrsysret+0x17e sys/kern/kern_ktrace.c:213 #8 syscall+0x5d5 mi_syscall_return sys/sys/syscall_mi.h:132 [inline] #8 syscall+0x5d5 sys/arch/amd64/amd64/trap.c:607 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82aa6758) #0 witness_lock+0x44d #1 syscall+0x5c2 mi_syscall_return sys/sys/syscall_mi.h:130 [inline] #1 syscall+0x5c2 sys/arch/amd64/amd64/trap.c:607 #2 Xsyscall+0x128 Process 12911 (syz-executor.1) thread 0xffff80002e387260 (479352) exclusive rrwlock inode r = 0 (0xfffffd8067a1b818) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vn_write+0x123 sys/kern/vfs_vnops.c:411 #6 dofilewritev+0x19c sys/kern/sys_generic.c:380 #7 sys_writev+0xa7 sys/kern/sys_generic.c:327 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 6584K 7043K 78643K 21052 0 pcb 14 20K 22K 78643K 1295 0 rtable 204 13K 17K 78643K 2829 0 ifaddr 96 19K 20K 78643K 970 0 sysctl 3 1K 1K 78643K 5 0 counters 56 35K 35K 78643K 204 0 ioctlops 0 0K 8K 78643K 22987 0 iov 1 0K 16K 78643K 666 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1400 87K 88K 78643K 4548 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 5K 13K 78643K 74 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1168 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 17 61K 81K 78643K 8028 0 sigio 0 0K 0K 78643K 52 0 proc 70 87K 111K 78643K 1287 0 subproc 104 6K 6K 78643K 309 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 427 0 in_multi 63 4K 6K 78643K 426 0 ether_multi 1 0K 0K 78643K 49 0 mrt 1 0K 0K 78643K 41 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 223 996K 996K 78643K 223 0 exec 0 0K 2K 78643K 1515 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 493 537K 537K 78643K 105080 0 UVM aobj 200 9K 9K 78643K 202 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 306 0 NDP 15 0K 1K 78643K 143 0 temp 158 4728K 4807K 78643K 50882 0 kqueue 11 16K 22K 78643K 422 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 120 322 0 319 4 3 1 2 0 8 0 rtentry 112 365 0 290 4 0 4 4 0 8 0 unpcb 136 5629 0 5614 56 50 6 8 0 8 5 syncache 296 38 0 38 10 10 0 1 0 8 0 tcpqe 32 632 6 632 4 4 0 2 0 8 0 tcpcb 736 2267 0 2260 84 77 7 14 0 8 5 arp 120 68 0 55 1 0 1 1 0 8 0 inpcb 304 7089 0 7078 87 78 9 15 0 8 8 rttmr 72 12 0 12 3 3 0 1 0 8 0 nd6 48 84 0 65 1 0 1 1 0 8 0 pkpcb 40 91 0 91 5 5 0 1 0 8 0 kcovpl 48 23 0 15 1 0 1 1 0 8 0 ppxss 1248 26 0 26 6 5 1 1 0 8 1 pfstscr 40 81 0 81 5 5 0 1 0 8 0 pffrag 232 52 0 51 4 3 1 1 0 482 0 pffrnode 88 52 0 51 4 3 1 1 0 8 0 pffrent 40 1671 0 1670 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 pfrktable 1344 757 0 744 6 4 2 2 0 8 0 pftag 88 14 0 4 1 0 1 1 0 8 0 pfqueue 264 5 0 5 1 1 0 1 0 8 0 pfstitem 24 35 0 30 1 0 1 1 0 8 0 pfstkey 112 123 0 118 1 0 1 1 0 8 0 pfstate 320 77 0 72 2 1 1 2 0 8 0 pfrule 1360 12633 0 10256 200 1 199 199 0 8 0 art_heap8 4096 4 0 2 3 1 2 3 0 8 0 art_heap4 256 1430 0 1076 36 11 25 31 0 8 0 art_table 32 1434 0 1078 4 0 4 4 0 8 0 art_node 16 361 0 294 1 0 1 1 0 8 0 sysvmsgpl 40 32 0 28 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 1165 0 1155 1 0 1 1 0 8 0 shmpl 112 199 0 2 6 0 6 6 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11419 0 9955 92 0 92 92 0 8 0 ffsino 272 11419 0 9955 98 0 98 98 0 8 0 nchpl 144 21864 0 20237 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 81526 0 81526 4 3 1 2 0 8 1 percpumem 16 114 0 74 1 0 1 1 0 8 0 vcpupl 2048 30 0 0 4 0 4 4 0 8 0 vmpool 560 36 0 6 4 1 3 3 0 8 0 pfiaddrpl 120 246 0 224 4 3 1 1 0 8 0 scsiplug 72 14 0 14 4 4 0 1 0 8 0 scxspl 216 77538 0 77538 14 13 1 8 0 8 1 plimitpl 152 748 0 733 1 0 1 1 0 8 0 sigapl 424 8330 0 8284 8 1 7 8 0 8 0 futexpl 64 69854 0 69845 2 1 1 1 0 8 0 knotepl 112 176 0 0 4 0 4 4 0 8 0 kqueuepl 216 2022 0 2011 38 35 3 8 0 8 2 pipepl 336 1817 0 1789 54 48 6 8 0 8 3 fdescpl 496 8294 0 8264 6 2 4 5 0 8 0 filepl 152 57148 0 56900 74 59 15 19 0 8 4 lockfpl 104 1855 0 1852 3 2 1 2 0 8 0 lockfspl 48 629 0 626 1 0 1 1 0 8 0 sessionpl 144 39 0 22 1 0 1 1 0 8 0 pgrppl 48 255 0 238 1 0 1 1 0 8 0 ucredpl 96 4998 0 4983 1 0 1 1 0 8 0 zombiepl 144 8284 0 8284 1 0 1 1 0 8 1 processpl 1064 8330 0 8284 5 0 5 5 0 8 0 procpl 672 24160 0 24092 15 8 7 9 0 8 0 srpgc 96 22 0 22 6 6 0 1 0 8 0 sosppl 168 82 0 82 10 9 1 1 0 8 1 sockpl 480 13144 0 13115 264 244 20 34 0 8 16 mcl64k 65536 32 0 0 4 1 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 19 0 0 2 0 2 2 0 8 0 mcl8k 8192 30 0 0 3 1 2 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 15 0 0 1 0 1 1 0 8 0 mcl2k 2048 266 0 0 28 0 28 28 0 8 0 mtagpl 96 484 0 0 8 0 8 8 0 8 0 mbufpl 256 1064 0 0 52 0 52 52 0 8 0 bufpl 288 14711 0 8375 453 0 453 453 0 8 0 anonpl 24 2358042 0 2336130 257 120 137 156 0 186 0 amapchunkpl 152 294722 0 293740 119 80 39 52 0 158 0 amappl16 200 23206 0 22512 144 107 37 49 0 8 0 amappl15 192 1128 0 1122 1 0 1 1 0 8 0 amappl14 184 57 0 52 1 0 1 1 0 8 0 amappl13 176 962 0 956 1 0 1 1 0 8 0 amappl12 168 1475 0 1470 1 0 1 1 0 8 0 amappl11 160 1178 0 1162 1 0 1 1 0 8 0 amappl10 152 2028 0 2020 1 0 1 1 0 8 0 amappl9 144 476 0 473 1 0 1 1 0 8 0 amappl8 136 2479 0 2380 4 0 4 4 0 8 0 amappl7 128 1564 0 1551 1 0 1 1 0 8 0 amappl6 120 282 0 252 2 1 1 2 0 8 0 amappl5 112 8863 0 8841 1 0 1 1 0 8 0 amappl4 104 2664 0 2632 2 1 1 2 0 8 0 amappl3 96 2767 0 2750 1 0 1 1 0 8 0 amappl2 88 2205 0 2143 3 1 2 3 0 8 0 amappl1 80 151309 0 150683 25 11 14 19 0 8 0 amappl 88 104114 0 103786 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 72 201 0 2 4 0 4 4 0 8 0 uaddrrnd 24 8330 0 8270 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8330 0 8270 1 0 1 1 0 8 0 vmmpekpl 168 71831 0 71767 4 0 4 4 0 8 0 vmmpepl 168 757141 0 754227 260 129 131 154 0 357 0 vmsppl 368 8329 0 8270 7 1 6 6 0 8 0 rwobjpl 56 190161 0 182204 124 9 115 116 0 8 0 pdppl 4096 16667 0 16570 294 195 99 99 0 8 2 pvpl 32 4082992 0 4056292 450 231 219 263 0 265 0 pmappl 248 8329 0 8270 5 1 4 4 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1430 0 343 32 0 32 32 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff828daff0) 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+0xb sys/dev/kcov.c:144 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f __sanitizer_cov_trace_const_cmp4(1,3) at __sanitizer_cov_trace_const_cmp4+0x31 kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_const_cmp4(1,3) at __sanitizer_cov_trace_const_cmp4+0x31 sys/dev/kcov.c:225 witness_checkorder(fffffd80631048e8,1,0) at witness_checkorder+0x4d sys/kern/subr_witness.c:765 rw_enter_read(fffffd80631048d8) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff8000246aa180,0) at uvmfault_lookup+0xe9 sys/uvm/uvm_fault.c:1744 uvm_fault_check(ffff8000246aa180,ffff8000246aa1b8,ffff8000246aa1e0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd80631048d0,e9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff8000246aa310,e9780) at kpageflttrap+0x209 kerntrap(ffff8000246aa310) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 end trace frame: 0xffff8000246aa390, count: 0 ddb{0}> trace x86_ipi_db(ffffffff828daff0) 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+0xb sys/dev/kcov.c:144 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f __sanitizer_cov_trace_const_cmp4(1,3) at __sanitizer_cov_trace_const_cmp4+0x31 kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_const_cmp4(1,3) at __sanitizer_cov_trace_const_cmp4+0x31 sys/dev/kcov.c:225 witness_checkorder(fffffd80631048e8,1,0) at witness_checkorder+0x4d sys/kern/subr_witness.c:765 rw_enter_read(fffffd80631048d8) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff8000246aa180,0) at uvmfault_lookup+0xe9 sys/uvm/uvm_fault.c:1744 uvm_fault_check(ffff8000246aa180,ffff8000246aa1b8,ffff8000246aa1e0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd80631048d0,e9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff8000246aa310,e9780) at kpageflttrap+0x209 kerntrap(ffff8000246aa310) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000246aa750) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246aa750) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdf2d5a04d70, count: -18 ddb{0}> machine ddbcpu 1 Stopped at memset+0x4e: repe stosq %es:(%rdi) memset() at memset+0x4e ffs_write(ffff800022c5a460) at ffs_write+0x924 VOP_WRITE(fffffd8066b86c00,ffff800022c5a518,3,fffffd807f7d8660) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000292dafc8,fffffd8066b86c00,fffffd807f7d8660,ffff800022c5a5e8,ffff800022c5a5c0) at ktrwriteraw+0x15f sys/kern/kern_ktrace.c:666 ktrsysret(ffff8000292dafc8,141,0,ffff800022c5a700) at ktrsysret+0x17e ktrwrite2 sys/kern/kern_ktrace.c:631 [inline] ktrsysret(ffff8000292dafc8,141,0,ffff800022c5a700) at ktrsysret+0x17e sys/kern/kern_ktrace.c:213 syscall(ffff800022c5a770) at syscall+0x5d5 mi_syscall_return sys/sys/syscall_mi.h:132 [inline] syscall(ffff800022c5a770) at syscall+0x5d5 sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9c345014190, count: 8 ddb{1}> trace memset() at memset+0x4e ffs_write(ffff800022c5a460) at ffs_write+0x924 VOP_WRITE(fffffd8066b86c00,ffff800022c5a518,3,fffffd807f7d8660) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000292dafc8,fffffd8066b86c00,fffffd807f7d8660,ffff800022c5a5e8,ffff800022c5a5c0) at ktrwriteraw+0x15f sys/kern/kern_ktrace.c:666 ktrsysret(ffff8000292dafc8,141,0,ffff800022c5a700) at ktrsysret+0x17e ktrwrite2 sys/kern/kern_ktrace.c:631 [inline] ktrsysret(ffff8000292dafc8,141,0,ffff800022c5a700) at ktrsysret+0x17e sys/kern/kern_ktrace.c:213 syscall(ffff800022c5a770) at syscall+0x5d5 mi_syscall_return sys/sys/syscall_mi.h:132 [inline] syscall(ffff800022c5a770) at syscall+0x5d5 sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9c345014190, count: -7