uvm_fault(0xffffffff82a35750, 0xffff80001d3bf000, 0, 2) -> d kernel: page fault trap, code=0 Stopped at memset+0x4e: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *393499 72420 0 0 0x4000000 0 syz-executor.5 memset() at memset+0x4e VOP_WRITE(fffffd80698ce228,ffff80002e7e2b08,64,fffffd807f7d83c0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd80698ce228,ffff800008943300,ffbc,0,1,10b2a50adff43f4e,ffff8000006b3000,fffffd80683c7b80,0) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:330 vndstrategy(fffffd80683c7b80) at vndstrategy+0x3b3 sys/dev/vnd.c:342 physio(ffffffff81ab2310,2902,0,ffffffff813a75e0,ffff80002e7e2f58) at physio+0x289 sys/kern/kern_physio.c:163 spec_write(ffff80002e7e2db0) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8078e4c4c0,ffff80002e7e2f58,1,fffffd807f7d8600) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806ccb4718,ffff80002e7e2f58,0) at vn_write+0x152 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002161e7e0,3,ffff80002e7e2f58,0,ffff80002e7e3050) at dofilewritev+0x19c sys/kern/sys_generic.c:380 sys_write(ffff80002161e7e0,ffff80002e7e2ff8,ffff80002e7e3050) at sys_write+0x83 sys/kern/sys_generic.c:300 syscall(ffff80002e7e30c0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17974bc1040, count: 3 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(0xffffffff82a35750, 0xffff80001d3bf000, 0, 2) -> d ddb> trace memset() at memset+0x4e VOP_WRITE(fffffd80698ce228,ffff80002e7e2b08,64,fffffd807f7d83c0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd80698ce228,ffff800008943300,ffbc,0,1,10b2a50adff43f4e,ffff8000006b3000,fffffd80683c7b80,0) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:330 vndstrategy(fffffd80683c7b80) at vndstrategy+0x3b3 sys/dev/vnd.c:342 physio(ffffffff81ab2310,2902,0,ffffffff813a75e0,ffff80002e7e2f58) at physio+0x289 sys/kern/kern_physio.c:163 spec_write(ffff80002e7e2db0) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8078e4c4c0,ffff80002e7e2f58,1,fffffd807f7d8600) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806ccb4718,ffff80002e7e2f58,0) at vn_write+0x152 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002161e7e0,3,ffff80002e7e2f58,0,ffff80002e7e3050) at dofilewritev+0x19c sys/kern/sys_generic.c:380 sys_write(ffff80002161e7e0,ffff80002e7e2ff8,ffff80002e7e3050) at sys_write+0x83 sys/kern/sys_generic.c:300 syscall(ffff80002e7e30c0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17974bc1040, count: -12 ddb> show registers rdi 0xffff80001d3bf000 rsi 0 rbp 0xffff80002e7e2a60 rbx 0xe rdx 0 rcx 0x800 rax 0 r8 0x4000 __ALIGN_SIZE+0x3000 r9 0xffff80002e7e29d8 r10 0x417af86588e79e37 r11 0xffff80001d3bf000 r12 0x4000 __ALIGN_SIZE+0x3000 r13 0x4000 __ALIGN_SIZE+0x3000 r14 0xffff80001d3bf000 r15 0x4000 __ALIGN_SIZE+0x3000 rip 0xffffffff81c2922e memset+0x4e cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80002e7e2998 ss 0 memset+0x4e: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor.5) pid=393499 stat=onproc flags process=0 proc=4000000 pri=17, usrpri=58, nice=20 forw=0xffffffffffffffff, list=0xffff80002b35c2b0,0xffff80002161e010 process=0xffff800027f2efd0 user=0xffff80002e7de000, vmspace=0xfffffd806826e778 estcpu=8, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 58264 94478 64481 0 2 0 syz-executor.2 58264 81121 64481 0 3 0x4000080 fsleep syz-executor.2 58264 328201 64481 0 3 0x4000080 fsleep syz-executor.2 63639 144324 44447 60928 2 0x10 syz-executor.3 63639 72917 44447 60928 3 0x4000090 fsleep syz-executor.3 63639 340376 44447 60928 3 0x4000090 fsleep syz-executor.3 63639 312888 44447 60928 3 0x4000090 fsleep syz-executor.3 12024 355929 47184 0 2 0 syz-executor.0 12024 371622 47184 0 3 0x4000080 fsleep syz-executor.0 85411 322632 96919 0 2 0 syz-executor.7 85411 178364 96919 0 3 0x4000080 fsleep syz-executor.7 38804 63443 82674 0 2 0 syz-executor.6 38804 380530 82674 0 3 0x4000080 fsleep syz-executor.6 72420 46597 70994 0 2 0 syz-executor.5 *72420 393499 70994 0 7 0x4000000 syz-executor.5 96919 16223 83450 0 3 0x82 nanoslp syz-executor.7 40475 15781 83450 0 2 0x482 syz-executor.4 77959 250402 0 0 3 0x14200 acct acct 72782 438383 83450 0 2 0x2 syz-executor.1 82674 495721 83450 0 3 0x82 nanoslp syz-executor.6 93263 458807 0 0 3 0x14280 nfsidl nfsio 58698 185869 0 0 3 0x14280 nfsidl nfsio 69920 463249 0 0 3 0x14280 nfsidl nfsio 68050 280011 0 0 3 0x14280 nfsidl nfsio 3447 279223 0 0 3 0x14280 nfsidl nfsio 89210 369667 0 0 3 0x14280 nfsidl nfsio 35205 394370 0 0 3 0x14200 bored sosplice 70994 436536 83450 0 3 0x82 nanoslp syz-executor.5 64481 66861 83450 0 2 0x482 syz-executor.2 47184 494316 83450 0 3 0x82 nanoslp syz-executor.0 44447 92882 83450 0 2 0x482 syz-executor.3 83450 57832 67502 0 3 0x82 thrsleep syz-fuzzer 83450 479862 67502 0 2 0x4000482 syz-fuzzer 83450 213057 67502 0 3 0x4000082 thrsleep syz-fuzzer 83450 197295 67502 0 3 0x4000082 thrsleep syz-fuzzer 83450 164499 67502 0 3 0x4000082 thrsleep syz-fuzzer 83450 290015 67502 0 3 0x4000082 thrsleep syz-fuzzer 83450 108232 67502 0 3 0x4000082 kqread syz-fuzzer 67502 8646 97364 0 3 0x10008a sigsusp ksh 97364 177893 28161 0 3 0x9a poll sshd 22819 80068 1 0 3 0x100083 ttyin getty 28161 291553 1 0 3 0x88 poll sshd 57472 22894 57699 73 3 0x100090 kqread syslogd 57699 23311 1 0 3 0x100082 netio syslogd 55038 440083 1 0 3 0x100080 kqread resolvd 32973 417595 85419 77 3 0x100092 kqread dhcpleased 96651 96783 85419 77 3 0x100092 kqread dhcpleased 85419 507306 1 0 3 0x80 kqread dhcpleased 88972 392901 0 0 3 0x14200 bored smr 86352 34549 0 0 2 0x14200 zerothread 8445 201811 0 0 3 0x14200 aiodoned aiodoned 35025 19823 0 0 3 0x14200 syncer update 54638 473626 0 0 3 0x14200 cleaner cleaner 26390 443978 0 0 3 0x14200 reaper reaper 72062 491429 0 0 3 0x14200 pgdaemon pagedaemon 28210 372275 0 0 3 0x14200 bored viomb 39309 199979 0 0 3 0x40014200 acpi0 acpi0 77188 196752 0 0 3 0x14200 bored softnet 30877 493428 0 0 3 0x14200 bored systqmp 93060 225555 0 0 3 0x14200 bored systq 46120 281299 0 0 3 0x40014200 bored softclock 11065 133389 0 0 3 0x40014200 idle0 1 410313 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10178 6407K 7253K 78643K 25351 0 pcb 13 14K 16K 78643K 420 0 rtable 198 12K 14K 78643K 749 0 ifaddr 83 18K 19K 78643K 254 0 sysctl 2 0K 0K 78643K 2 0 counters 26 17K 17K 78643K 52 0 ioctlops 0 0K 4K 78643K 1835 0 iov 0 0K 16K 78643K 299 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1431 89K 90K 78643K 6052 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 23 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 1144 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 16 57K 81K 78643K 4042 0 sigio 0 0K 0K 78643K 17 0 proc 57 55K 71K 78643K 667 0 subproc 104 13K 13K 78643K 169 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 39 0 in_multi 76 5K 6K 78643K 240 0 ether_multi 1 0K 0K 78643K 16 0 mrt 0 0K 0K 78643K 26 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 169 758K 758K 78643K 169 0 exec 0 0K 2K 78643K 1183 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 321 134K 134K 78643K 50054 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 57 0 NDP 11 0K 2K 78643K 72 0 temp 126 4691K 4759K 78643K 21694 0 kqueue 10 14K 18K 78643K 52 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 87 0 84 1 0 1 1 0 8 0 rtentry 112 206 0 131 4 0 4 4 0 8 0 unpcb 136 1351 0 1338 28 27 1 6 0 8 0 syncache 296 8 0 8 3 3 0 1 0 8 0 tcpqe 32 61 0 61 3 3 0 1 0 8 0 tcpcb 736 774 0 770 39 38 1 10 0 8 0 arp 88 28 0 16 1 0 1 1 0 8 0 ipq 40 7 0 7 3 3 0 1 0 8 0 ipqe 40 332 0 332 3 3 0 1 0 8 0 inpcb 304 1877 0 1870 73 72 1 9 0 8 0 rttmr 72 9 0 9 3 3 0 1 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 4 0 4 1 1 0 1 0 8 0 nd6 48 49 0 31 1 0 1 1 0 8 0 pkpcb 40 6 0 6 2 2 0 1 0 8 0 kcovpl 48 13 0 5 1 0 1 1 0 8 0 ppxss 1152 7 0 7 2 2 0 1 0 8 0 pfstscr 40 6 0 6 1 1 0 1 0 8 0 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfrktable 1344 25 0 12 2 0 2 2 0 8 0 pfpktdelay 88 22 0 22 1 1 0 1 0 8 0 pftag 88 5 0 0 1 0 1 1 0 8 0 pfqueue 264 1 0 1 1 1 0 1 0 8 0 pfstitem 24 8 0 8 1 1 0 1 0 8 0 pfstkey 112 12 0 12 1 1 0 1 0 8 0 pfstate 320 6 0 6 1 1 0 1 0 8 0 pfrule 1360 653 0 387 23 0 23 23 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 902 0 569 32 11 21 29 0 8 0 art_table 32 903 0 569 4 0 4 4 0 8 0 art_node 16 202 0 137 1 0 1 1 0 8 0 sysvmsgpl 40 20 0 0 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 1142 0 1132 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 7650 0 6220 90 0 90 90 0 8 0 ffsino 240 7650 0 6220 85 0 85 85 0 8 0 nchpl 144 12555 0 10934 62 0 62 62 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 44597 0 44596 3 2 1 1 0 8 0 vcpupl 1984 3 0 0 1 0 1 1 0 8 0 vmpool 528 6 0 3 2 1 1 1 0 8 0 pfiaddrpl 120 88 0 8 3 0 3 3 0 8 0 scxspl 216 38608 0 38608 13 12 1 8 0 8 1 plimitpl 152 211 0 197 1 0 1 1 0 8 0 sigapl 424 4335 0 4287 10 4 6 8 0 8 0 futexpl 64 43942 0 43934 3 2 1 1 0 8 0 knotepl 112 618 0 544 3 0 3 3 0 8 0 kqueuepl 184 325 0 319 6 5 1 4 0 8 0 pipepl 304 416 0 388 15 12 3 8 0 8 0 fdescpl 432 4300 0 4273 4 0 4 4 0 8 0 filepl 120 24433 0 24191 90 80 10 15 0 8 2 lockfpl 104 585 0 583 2 1 1 2 0 8 0 lockfspl 48 155 0 153 1 0 1 1 0 8 0 sessionpl 144 28 0 12 1 0 1 1 0 8 0 pgrppl 48 28 0 12 1 0 1 1 0 8 0 ucredpl 96 4561 0 4549 1 0 1 1 0 8 0 zombiepl 144 4287 0 4286 1 0 1 1 0 8 0 processpl 1000 4335 0 4286 9 1 8 9 0 8 0 procpl 672 9842 0 9778 11 4 7 8 0 8 0 sosppl 168 13 0 13 3 3 0 1 0 8 0 sockpl 448 3338 0 3315 165 161 4 25 0 8 1 mcl64k 65536 118 0 118 21 20 1 1 0 8 1 mcl16k 16384 35 0 35 14 13 1 1 0 8 1 mcl12k 12288 620 0 620 4 3 1 1 0 8 1 mcl9k 9216 362 0 362 8 7 1 1 0 8 1 mcl8k 8192 113 0 113 19 18 1 1 0 8 1 mcl4k 4096 320 0 320 17 16 1 1 0 8 1 mcl2k2 2112 10 0 10 9 9 0 1 0 8 0 mcl2k 2048 86620 0 86577 15 8 7 12 0 8 0 mtagpl 96 873 0 381 14 1 13 13 0 8 1 mbufpl 256 171641 0 170397 161 81 80 81 0 8 0 bufpl 288 10876 0 4461 459 0 459 459 0 8 0 anonpl 24 1104560 0 1084965 146 19 127 136 0 188 0 amapchunkpl 152 132408 0 131615 77 43 34 42 0 158 2 amappl16 200 9416 0 8743 53 17 36 48 0 8 0 amappl15 192 509 0 503 1 0 1 1 0 8 0 amappl14 184 5 0 4 1 0 1 1 0 8 0 amappl13 176 1050 0 1042 1 0 1 1 0 8 0 amappl12 168 269 0 266 1 0 1 1 0 8 0 amappl11 160 39 0 28 1 0 1 1 0 8 0 amappl10 152 528 0 526 1 0 1 1 0 8 0 amappl9 144 1447 0 1441 1 0 1 1 0 8 0 amappl8 136 1444 0 1385 4 1 3 3 0 8 0 amappl7 128 916 0 902 1 0 1 1 0 8 0 amappl6 120 1167 0 1145 1 0 1 1 0 8 0 amappl5 112 4078 0 4062 1 0 1 1 0 8 0 amappl4 104 939 0 912 1 0 1 1 0 8 0 amappl3 96 1935 0 1921 1 0 1 1 0 8 0 amappl2 88 1707 0 1660 2 0 2 2 0 8 0 amappl1 80 75759 0 75201 20 7 13 13 0 8 0 amappl 88 49510 0 49270 7 0 7 7 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 4306 0 4276 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4306 0 4276 1 0 1 1 0 8 0 vmmpekpl 168 29394 0 29345 3 0 3 3 0 8 0 vmmpepl 168 382410 0 379856 232 113 119 130 0 357 2 vmsppl 272 4305 0 4276 5 2 3 3 0 8 0 rwobjpl 24 92943 0 85283 51 4 47 48 0 8 0 pdppl 4096 8618 0 8555 474 407 67 72 0 8 4 pvpl 32 1905609 0 1881750 273 74 199 217 0 265 2 pmappl 216 4305 0 4276 2 0 2 2 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1629 0 779 25 0 25 25 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x4e VOP_WRITE(fffffd80698ce228,ffff80002e7e2b08,64,fffffd807f7d83c0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd80698ce228,ffff800008943300,ffbc,0,1,10b2a50adff43f4e,ffff8000006b3000,fffffd80683c7b80,0) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:330 vndstrategy(fffffd80683c7b80) at vndstrategy+0x3b3 sys/dev/vnd.c:342 physio(ffffffff81ab2310,2902,0,ffffffff813a75e0,ffff80002e7e2f58) at physio+0x289 sys/kern/kern_physio.c:163 spec_write(ffff80002e7e2db0) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8078e4c4c0,ffff80002e7e2f58,1,fffffd807f7d8600) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806ccb4718,ffff80002e7e2f58,0) at vn_write+0x152 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002161e7e0,3,ffff80002e7e2f58,0,ffff80002e7e3050) at dofilewritev+0x19c sys/kern/sys_generic.c:380 sys_write(ffff80002161e7e0,ffff80002e7e2ff8,ffff80002e7e3050) at sys_write+0x83 sys/kern/sys_generic.c:300 syscall(ffff80002e7e30c0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17974bc1040, count: -12 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x4e VOP_WRITE(fffffd80698ce228,ffff80002e7e2b08,64,fffffd807f7d83c0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd80698ce228,ffff800008943300,ffbc,0,1,10b2a50adff43f4e,ffff8000006b3000,fffffd80683c7b80,0) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:330 vndstrategy(fffffd80683c7b80) at vndstrategy+0x3b3 sys/dev/vnd.c:342 physio(ffffffff81ab2310,2902,0,ffffffff813a75e0,ffff80002e7e2f58) at physio+0x289 sys/kern/kern_physio.c:163 spec_write(ffff80002e7e2db0) at spec_write+0xcb sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd8078e4c4c0,ffff80002e7e2f58,1,fffffd807f7d8600) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd806ccb4718,ffff80002e7e2f58,0) at vn_write+0x152 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002161e7e0,3,ffff80002e7e2f58,0,ffff80002e7e3050) at dofilewritev+0x19c sys/kern/sys_generic.c:380 sys_write(ffff80002161e7e0,ffff80002e7e2ff8,ffff80002e7e3050) at sys_write+0x83 sys/kern/sys_generic.c:300 syscall(ffff80002e7e30c0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17974bc1040, count: -12