uvm_fault(0xffffffff8398e490, 0xffff800026fb5f60, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *506177 69808 0 0x2 0x1 0 syz-executor memset() at memset+0x52 ffs_write(ffff80002a8f5880) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8059abb200,ffff80002a8f5930,3,fffffd8007bfb618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a7b6fa0,fffffd8059abb200,fffffd8007bfb618,ffff80002a8f5a00,ffff80002a8f59e0) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691 ktrsyscall(ffff80002a7b6fa0,5,18,ffff80002a8f5b80) at ktrsyscall+0x332 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80002a7b6fa0,5,18,ffff80002a8f5b80) at ktrsyscall+0x332 sys/kern/kern_ktrace.c:183 syscall(ffff80002a8f5b80) at syscall+0x2bc mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a8f5b80) at syscall+0x2bc sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e2156a2f9f0, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xffffffff8398e490, 0xffff800026fb5f60, 0, 2) -> d ddb> trace memset() at memset+0x52 ffs_write(ffff80002a8f5880) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8059abb200,ffff80002a8f5930,3,fffffd8007bfb618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a7b6fa0,fffffd8059abb200,fffffd8007bfb618,ffff80002a8f5a00,ffff80002a8f59e0) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691 ktrsyscall(ffff80002a7b6fa0,5,18,ffff80002a8f5b80) at ktrsyscall+0x332 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80002a7b6fa0,5,18,ffff80002a8f5b80) at ktrsyscall+0x332 sys/kern/kern_ktrace.c:183 syscall(ffff80002a8f5b80) at syscall+0x2bc mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a8f5b80) at syscall+0x2bc sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e2156a2f9f0, count: -7 ddb> show registers rdi 0xffff800026fb5f60 rsi 0 rbp 0xffff80002a8f57a0 rbx 0x5ff60 acpi_pdirpa+0x4bdd1 rdx 0 rcx 0x14 rax 0 r8 0xa0 r9 0xffff80002a8f5700 r10 0x21b2ec737e004e47 r11 0xffff800026fb5f60 r12 0x3f60 __ALIGN_SIZE+0x2f60 r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xfffffd8059abb200 r15 0x1 rip 0xffffffff81323912 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002a8f5598 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor) tid=506177 pid=69808 tcnt=1 stat=onproc flags process=2 proc=1 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7b7c98,0xffff80002a7ab250 process=0xffff80002a7efa90 user=0xffff80002a8f0000, vmspace=0xfffffd8070f5f178 estcpu=36, cpticks=3, pctcpu=0.1, user=0, sys=3, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 95983 16035 14182 0 2 0 syz-executor 95983 261223 14182 0 3 0x4000080 fsleep syz-executor 45800 17135 99732 0 2 0 syz-executor 45800 66924 99732 0 3 0x4000080 fsleep syz-executor 84673 110020 69935 0 2 0 syz-executor 46262 448142 4737 0 2 0 syz-executor 46262 422081 4737 0 3 0x4000080 fsleep syz-executor 46262 428187 4737 0 2 0x4000000 syz-executor 19549 287894 67117 0 2 0x400010 syz-executor 19549 363020 67117 0 3 0x4400090 fsleep syz-executor 3435 207335 5272 0 3 0x80 nanoslp syz-executor 3435 432008 5272 0 3 0x4000080 kqread syz-executor 3435 273170 5272 0 3 0x4000080 fsleep syz-executor 3435 462613 5272 0 3 0x4000080 kqread syz-executor 8368 56229 62523 0 3 0x80 nanoslp syz-executor 8368 147399 62523 0 3 0x4000080 kqsel syz-executor 8368 220908 62523 0 3 0x4000080 fsleep syz-executor 77040 302119 0 0 3 0x14200 acct acct 56138 263874 1 0 3 0x100083 ttyin getty 27544 176571 0 0 3 0x14200 bored sosplice *69808 506177 49086 0 7 0x3 syz-executor 69935 293030 49086 0 2 0x2 syz-executor 14182 89945 49086 0 3 0x82 nanoslp syz-executor 62523 111324 49086 0 3 0x82 nanoslp syz-executor 4737 228622 49086 0 3 0x82 nanoslp syz-executor 67117 95262 49086 0 3 0x82 nanoslp syz-executor 5272 270657 49086 0 3 0x82 nanoslp syz-executor 99732 324879 49086 0 3 0x82 nanoslp syz-executor 49086 266247 52194 0 3 0x82 kqread syz-executor 52194 403535 36307 0 3 0x10008a sigsusp ksh 36307 308250 72833 0 3 0x98 kqread sshd-session 72833 2052 53030 0 3 0x92 kqread sshd-session 53030 479883 1 0 3 0x88 kqread sshd 78776 181677 86320 73 3 0x1100090 kqread syslogd 86320 289151 1 0 3 0x100082 sbwait syslogd 60167 309644 1 0 3 0x100080 kqread resolvd 74292 398454 3596 77 3 0x100092 kqread dhcpleased 7795 40173 3596 77 3 0x100092 kqread dhcpleased 3596 509135 1 0 3 0x80 kqread dhcpleased 31838 141049 0 0 3 0x14200 bored smr 11423 62002 0 0 2 0x14200 zerothread 93942 203063 0 0 3 0x14200 aiodoned aiodoned 71311 155409 0 0 3 0x14200 syncer update 96714 100599 0 0 3 0x14200 cleaner cleaner 72418 358476 0 0 3 0x14200 reaper reaper 54573 232829 0 0 3 0x14200 pgdaemon pagedaemon 49451 192437 0 0 3 0x14200 bored viomb 73241 237316 0 0 3 0x40014200 acpi0 acpi0 9678 109409 0 0 3 0x14200 bored softnet0 50173 44912 0 0 3 0x14200 bored systqmp 47495 53623 0 0 3 0x14200 bored systq 11784 54205 0 0 3 0x40014200 tmoslp softclock 84119 145680 0 0 3 0x40014200 idle0 1 337461 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10184 11109K 11397K 166960K 11886 0 pcb 17 16K 18K 166960K 166 0 rtable 197 6K 10K 166960K 340 0 pf 37 14K 17K 166960K 84 0 ifaddr 44 7K 8K 166960K 67 0 ifgroup 55 2K 2K 166960K 89 0 sysctl 4 1K 9K 166960K 11 0 counters 34 17K 18K 166960K 52 0 ioctlops 0 0K 4K 166960K 155 0 iov 0 0K 24K 166960K 26 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1372 86K 87K 166960K 1799 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 13 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 469 0 sigio 0 0K 0K 166960K 3 0 proc 60 59K 124K 166960K 532 0 subproc 72 4K 4K 166960K 73 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 103 0 in_multi 100 7K 7K 166960K 126 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 380 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 214 158K 169K 166960K 5634 0 UVM aobj 11 2K 2K 166960K 14 0 pinsyscall 38 76K 96K 166960K 1485 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 14 0 NDP 12 0K 2K 166960K 39 0 temp 78 8648K 8904K 166960K 10657 0 kqueue 17 26K 35K 166960K 113 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 125 0 119 3 0 3 3 0 8 2 rtentry 136 111 0 27 4 0 4 4 0 8 0 unpcb 144 451 0 432 3 0 3 3 0 8 2 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 323 0 319 7 0 7 7 0 8 6 arp 96 12 0 2 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 783 0 775 12 3 9 12 0 8 8 ip6q 72 2 0 1 1 0 1 1 0 8 0 ip6af 40 3 0 2 1 0 1 1 0 8 0 nd6 112 16 0 0 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 15 0 14 1 0 1 1 0 8 0 pppxif 1384 4 0 3 1 0 1 1 0 8 0 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pfrktable 1344 10 0 10 1 0 1 1 0 8 1 pfanchor 1288 1 0 1 1 0 1 1 0 8 1 pftag 88 2 0 1 1 0 1 1 0 8 0 pfstitem 24 6 0 0 1 0 1 1 0 8 0 pfstkey 128 136 0 130 1 0 1 1 0 8 0 pfstate 384 68 0 65 1 0 1 1 0 8 0 pfrule 1344 6 0 6 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 559 0 179 30 0 30 30 0 8 4 art_table 40 560 0 179 5 0 5 5 0 8 0 art_node 32 111 0 38 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 11 0 1 1 0 1 1 0 8 0 shmpl 112 11 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2328 0 822 95 0 95 95 0 8 0 ffsino 256 2328 0 822 95 0 95 95 0 8 0 nchpl 144 2984 0 1302 63 0 63 63 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 uvmvnodes 80 2589 0 0 53 0 53 53 0 8 0 vnodes 216 2589 0 0 144 0 144 144 0 8 0 namei 1024 9451 0 9451 2 0 2 2 0 8 2 pfiaddrpl 120 3 0 3 1 0 1 1 0 8 1 kstatmem 264 46 0 22 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 15043 0 15043 8 0 8 8 1 8 8 plimitpl 152 147 0 130 1 0 1 1 0 8 0 sigapl 424 744 0 700 6 0 6 6 0 8 0 knotepl 120 16490 0 16429 10 0 10 10 0 8 8 kqueuepl 184 137 0 123 1 0 1 1 0 8 0 pipepl 304 193 0 166 3 0 3 3 0 8 0 fdescpl 448 728 0 699 5 0 5 5 0 8 1 filepl 120 4871 0 4642 11 0 11 11 0 8 3 lockfpl 104 150 0 146 1 0 1 1 0 8 0 lockfspl 48 69 0 65 1 0 1 1 0 8 0 sessionpl 144 22 0 14 1 0 1 1 0 8 0 pgrppl 48 34 0 18 1 0 1 1 0 8 0 ucredpl 104 819 0 807 1 0 1 1 0 8 0 zombiepl 144 700 0 700 1 0 1 1 0 8 1 processpl 1152 744 0 700 4 0 4 4 0 8 0 procpl 664 1247 0 1193 6 0 6 6 0 8 1 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 552 1376 0 1343 14 4 10 12 0 8 7 mcl64k 65536 30 0 30 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 4 0 4 1 0 1 1 0 8 1 mcl4k 4096 2875 0 2824 13 0 13 13 0 8 6 mcl2k 2048 652 0 645 2 0 2 2 0 8 1 mtagpl 96 5 0 4 1 0 1 1 0 8 0 mbufpl 256 7594 0 7404 13 0 13 13 0 8 0 bufpl 280 6849 0 621 446 0 446 446 0 8 0 anonpl 24 148985 0 145926 57 0 57 57 0 187 24 amapchunkpl 152 18382 0 17944 27 0 27 27 0 158 7 amappl16 200 3080 0 3048 24 9 15 21 0 8 10 amappl15 192 3 0 3 1 0 1 1 0 8 1 amappl14 184 103 0 93 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 0 1 1 0 8 1 amappl12 168 1396 0 1368 3 0 3 3 0 8 1 amappl11 160 45 0 35 1 0 1 1 0 8 0 amappl10 152 17 0 17 1 0 1 1 0 8 1 amappl9 144 258 0 258 1 0 1 1 0 8 1 amappl8 136 19 0 18 1 0 1 1 0 8 0 amappl7 128 111 0 101 1 0 1 1 0 8 0 amappl6 120 166 0 161 1 0 1 1 0 8 0 amappl5 112 122 0 114 1 0 1 1 0 8 0 amappl4 104 265 0 248 1 0 1 1 0 8 0 amappl3 96 3031 0 2947 3 0 3 3 0 8 0 amappl2 88 948 0 876 2 0 2 2 0 8 0 amappl1 80 9184 0 8642 13 0 13 13 0 8 1 amappl 88 4944 0 4794 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 254 0 254 1 0 1 1 0 8 1 dma64 64 7 0 7 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 13 0 3 1 0 1 1 0 8 0 uaddrrnd 24 728 0 699 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 728 0 699 1 0 1 1 0 8 0 vmmpekpl 168 7066 0 7027 3 0 3 3 0 8 0 vmmpepl 168 51924 0 50102 99 0 99 99 0 357 17 vmsppl 368 727 0 699 4 0 4 4 0 8 1 rwobjpl 40 18990 0 15556 38 0 38 38 0 8 1 pdppl 4096 1462 0 1398 98 32 66 82 0 8 2 pvpl 32 356798 0 348616 138 0 138 138 0 265 49 pmappl 216 727 0 699 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 374 0 32 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x52 ffs_write(ffff80002a8f5880) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8059abb200,ffff80002a8f5930,3,fffffd8007bfb618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a7b6fa0,fffffd8059abb200,fffffd8007bfb618,ffff80002a8f5a00,ffff80002a8f59e0) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691 ktrsyscall(ffff80002a7b6fa0,5,18,ffff80002a8f5b80) at ktrsyscall+0x332 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80002a7b6fa0,5,18,ffff80002a8f5b80) at ktrsyscall+0x332 sys/kern/kern_ktrace.c:183 syscall(ffff80002a8f5b80) at syscall+0x2bc mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a8f5b80) at syscall+0x2bc sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e2156a2f9f0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x52 ffs_write(ffff80002a8f5880) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8059abb200,ffff80002a8f5930,3,fffffd8007bfb618) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002a7b6fa0,fffffd8059abb200,fffffd8007bfb618,ffff80002a8f5a00,ffff80002a8f59e0) at ktrwriteraw+0x19b sys/kern/kern_ktrace.c:691 ktrsyscall(ffff80002a7b6fa0,5,18,ffff80002a8f5b80) at ktrsyscall+0x332 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80002a7b6fa0,5,18,ffff80002a8f5b80) at ktrsyscall+0x332 sys/kern/kern_ktrace.c:183 syscall(ffff80002a8f5b80) at syscall+0x2bc mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a8f5b80) at syscall+0x2bc sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e2156a2f9f0, count: -7