uvm_fault(0xffffffff82bcbd30, 0xffff800009491739, 0, 2) -> d kernel: page fault trap, code=0 Stopped at memset+0x45: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *433300 6008 0 0 0x4000001 0 syz-executor.3 memset() at memset+0x45 ffs_write(ffff800024a5a940) at ffs_write+0x924 VOP_WRITE(fffffd80671b6048,ffff800024a5a9f0,3,fffffd807f7d72d8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002b422930,fffffd80671b6048,fffffd807f7d72d8,ffff800024a5aab0,ffff800024a5aa90) at ktrwriteraw+0x146 sys/kern/kern_ktrace.c:661 ktrsysret(ffff80002b422930,141,0,ffff800024a5abb0) at ktrsysret+0x158 ktrwrite2 sys/kern/kern_ktrace.c:624 [inline] ktrsysret(ffff80002b422930,141,0,ffff800024a5abb0) at ktrsysret+0x158 sys/kern/kern_ktrace.c:206 syscall(ffff800024a5ac30) at syscall+0x5a7 mi_syscall_return sys/sys/syscall_mi.h:139 [inline] syscall(ffff800024a5ac30) at syscall+0x5a7 sys/arch/amd64/amd64/trap.c:646 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb4546a3a6c0, 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(0xffffffff82bcbd30, 0xffff800009491739, 0, 2) -> d ddb> trace memset() at memset+0x45 ffs_write(ffff800024a5a940) at ffs_write+0x924 VOP_WRITE(fffffd80671b6048,ffff800024a5a9f0,3,fffffd807f7d72d8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002b422930,fffffd80671b6048,fffffd807f7d72d8,ffff800024a5aab0,ffff800024a5aa90) at ktrwriteraw+0x146 sys/kern/kern_ktrace.c:661 ktrsysret(ffff80002b422930,141,0,ffff800024a5abb0) at ktrsysret+0x158 ktrwrite2 sys/kern/kern_ktrace.c:624 [inline] ktrsysret(ffff80002b422930,141,0,ffff800024a5abb0) at ktrsysret+0x158 sys/kern/kern_ktrace.c:206 syscall(ffff800024a5ac30) at syscall+0x5a7 mi_syscall_return sys/sys/syscall_mi.h:139 [inline] syscall(ffff800024a5ac30) at syscall+0x5a7 sys/arch/amd64/amd64/trap.c:646 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb4546a3a6c0, count: -7 ddb> show registers rdi 0xffff800009491739 rsi 0 rbp 0xffff800024a5a860 rbx 0x1 rdx 0x7 rcx 0x7 rax 0 r8 0xc0 r9 0xffff800024a5a7b8 r10 0x897e74ab8665f6a r11 0xffff800009491739 r12 0x6739 __ALIGN_SIZE+0x5739 r13 0xfffffd80684f1d48 r14 0x2800 __ALIGN_SIZE+0x1800 r15 0xfffffd80684f1d30 rip 0xffffffff8174c625 memset+0x45 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff800024a5a668 ss 0x10 memset+0x45: repe stosb %es:(%rdi) ddb> show proc PROC (syz-executor.3) pid=433300 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002b423c38,0xffff80002b422688 process=0xffff8000216f6000 user=0xffff800024a55000, vmspace=0xfffffd80700d5008 estcpu=36, cpticks=27, pctcpu=0.0 user=0, sys=27, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 58419 26175 13011 0 2 0 syz-executor.1 58419 308992 13011 0 3 0x4000080 fsleep syz-executor.1 57183 348260 51055 0 2 0 syz-executor.0 57183 207615 51055 0 3 0x4000080 netio syz-executor.0 57183 114303 51055 0 3 0x4000080 fsleep syz-executor.0 14756 473268 2176 0 2 0 syz-executor.4 14756 519697 2176 0 3 0x4000080 netio syz-executor.4 14756 158445 2176 0 2 0x4000000 syz-executor.4 6008 454530 37310 0 2 0 syz-executor.3 6008 324691 37310 0 3 0x4000080 netio syz-executor.3 * 6008 433300 37310 0 7 0x4000001 syz-executor.3 57780 10598 79642 0 2 0 syz-executor.5 57780 280154 79642 0 3 0x4000080 fsleep syz-executor.5 57780 507393 79642 0 3 0x4000080 fsleep syz-executor.5 28780 145890 15649 0 2 0 syz-executor.7 28780 239500 15649 0 3 0x4000080 fsleep syz-executor.7 99452 464025 20218 0 2 0 syz-executor.6 99452 154353 20218 0 3 0x4000080 fsleep syz-executor.6 15648 336735 67981 0 2 0 syz-executor.2 15648 154765 67981 0 3 0x4000080 fsleep syz-executor.2 13011 22345 96805 0 2 0x482 syz-executor.1 59188 224355 0 0 3 0x14280 nfsidl nfsio 40913 52182 0 0 3 0x14280 nfsidl nfsio 4784 70370 0 0 3 0x14280 nfsidl nfsio 44127 145345 0 0 3 0x14280 nfsidl nfsio 17833 71189 0 0 3 0x14280 nfsidl nfsio 78481 329357 0 0 3 0x14280 nfsidl nfsio 53637 135139 0 0 3 0x14280 nfsidl nfsio 63564 278302 0 0 3 0x14280 nfsidl nfsio 53972 273290 0 0 3 0x14280 nfsidl nfsio 42433 136714 0 0 3 0x14280 nfsidl nfsio 6918 440353 0 0 3 0x14280 nfsidl nfsio 22296 338314 0 0 3 0x14280 nfsidl nfsio 26498 368367 0 0 3 0x14280 nfsidl nfsio 32525 147106 0 0 3 0x14280 nfsidl nfsio 75336 412083 0 0 3 0x14280 nfsidl nfsio 59174 93561 0 0 3 0x14280 nfsidl nfsio 94139 93619 0 0 3 0x14280 nfsidl nfsio 8024 217225 0 0 3 0x14280 nfsidl nfsio 22311 172141 0 0 3 0x14280 nfsidl nfsio 92261 413218 0 0 3 0x14280 nfsidl nfsio 2176 12703 96805 0 2 0x482 syz-executor.4 51055 391630 96805 0 2 0x482 syz-executor.0 14884 295515 0 0 3 0x14200 acct acct 37310 369244 96805 0 2 0x482 syz-executor.3 15649 330827 96805 0 2 0x482 syz-executor.7 20218 139815 96805 0 2 0x482 syz-executor.6 67981 236917 96805 0 2 0x482 syz-executor.2 79642 434663 96805 0 2 0x482 syz-executor.5 67099 4750 0 0 3 0x14200 bored sosplice 96805 15038 69204 0 3 0x82 wait syz-fuzzer 96805 464757 69204 0 2 0x4000482 syz-fuzzer 96805 367041 69204 0 3 0x4000082 thrsleep syz-fuzzer 96805 92688 69204 0 2 0x4000482 syz-fuzzer 96805 169541 69204 0 3 0x4000082 wait syz-fuzzer 96805 73235 69204 0 3 0x4000082 wait syz-fuzzer 96805 232240 69204 0 3 0x4000082 wait syz-fuzzer 96805 29422 69204 0 3 0x4000082 thrsleep syz-fuzzer 96805 170509 69204 0 3 0x4000082 wait syz-fuzzer 96805 86926 69204 0 3 0x4000082 thrsleep syz-fuzzer 96805 343237 69204 0 3 0x4000082 thrsleep syz-fuzzer 96805 402380 69204 0 3 0x4000082 wait syz-fuzzer 96805 323996 69204 0 3 0x4000082 wait syz-fuzzer 96805 356679 69204 0 3 0x4000082 wait syz-fuzzer 69204 333939 7483 0 3 0x10008a sigsusp ksh 7483 420796 75219 0 3 0x9a kqread sshd 22833 375851 1 0 3 0x100083 ttyopn getty 75219 441776 1 0 3 0x88 kqread sshd 61530 390811 34915 73 2 0x1100090 syslogd 34915 159522 1 0 3 0x100082 netio syslogd 50941 289714 1 0 3 0x100080 kqread resolvd 77989 82403 55555 77 3 0x100092 kqread dhcpleased 23940 449288 55555 77 3 0x100092 kqread dhcpleased 55555 445935 1 0 3 0x80 kqread dhcpleased 54093 8574 0 0 3 0x14200 bored smr 85684 112687 0 0 2 0x14200 zerothread 77064 382522 0 0 3 0x14200 aiodoned aiodoned 52867 430294 0 0 2 0x14600 update 4299 213609 0 0 3 0x14200 cleaner cleaner 14169 426011 0 0 3 0x14200 reaper reaper 97780 65442 0 0 3 0x14200 pgdaemon pagedaemon 89411 476037 0 0 3 0x14200 bored viomb 32432 287821 0 0 3 0x40014200 acpi0 acpi0 28786 298921 0 0 3 0x14200 bored softnet 7210 363927 0 0 3 0x14200 bored softnet 60795 86051 0 0 3 0x14200 bored softnet 31233 148515 0 0 2 0x14200 softnet 73779 422909 0 0 3 0x14200 bored systqmp 29010 95277 0 0 3 0x14200 bored systq 19820 402028 0 0 2 0x40014200 softclock 83476 252524 0 0 3 0x40014200 idle0 1 261546 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 10225 6430K 6877K 78643K 25883 0 pcb 13 20K 23K 78643K 2883 0 rtable 197 15K 16K 78643K 5378 0 ifaddr 97 30K 33K 78643K 1448 0 sysctl 3 1K 1K 78643K 5 0 counters 27 17K 17K 78643K 657 0 ioctlops 0 0K 4K 78643K 2401 0 iov 2 0K 32K 78643K 2412 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1473 92K 92K 78643K 9939 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 136 0 VM map 2 1K 1K 78643K 2 0 sem 9 1K 1K 78643K 12 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 18 65K 73K 78643K 12587 0 sigio 0 0K 0K 78643K 481 0 proc 61 59K 75K 78643K 3077 0 subproc 104 6K 6K 78643K 1151 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 809 0 in_multi 89 6K 7K 78643K 2011 0 ether_multi 1 0K 0K 78643K 99 0 mrt 1 0K 0K 78643K 45 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 241 1076K 1076K 78643K 241 0 exec 0 0K 1K 78643K 3586 0 pfkey data 0 0K 0K 78643K 8 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 8 62K 64K 78643K 10 0 UVM amap 342 88K 103K 78643K 81298 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 513 0 NDP 12 0K 1K 78643K 567 0 temp 130 5770K 6805K 78643K 148371 0 kqueue 12 18K 28K 78643K 1201 0 SYN cache 2 2352K 2360K 78643K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 1299 0 1296 16 15 1 3 0 8 0 rtentry 112 1723 0 1638 4 1 3 4 0 8 0 unpcb 144 10360 0 10337 112 106 6 6 0 8 5 syncache 296 58 0 58 15 15 0 1 0 8 0 tcpqe 32 256 0 256 7 7 0 1 0 8 0 tcpcb 776 18118 0 18107 264 255 9 18 0 8 7 arp 88 199 0 183 1 0 1 1 0 8 0 ipq 40 5 0 5 3 3 0 1 0 8 0 ipqe 40 45 0 45 3 3 0 1 0 8 0 inpcb 336 28260 0 28246 286 277 9 18 0 8 7 nd6 48 399 0 378 1 0 1 1 0 8 0 pkpcb 40 92 0 92 9 9 0 1 0 8 0 kcovpl 48 88 0 80 1 0 1 1 0 8 0 mppekey 1024 9 0 9 4 4 0 1 0 8 0 ppxss 1160 450 0 450 26 26 0 1 0 8 0 pppxif 1360 290 0 290 21 21 0 1 0 8 0 pfstscr 40 266 0 242 1 0 1 1 0 8 0 pfosfp 40 5 0 4 1 0 1 1 0 8 0 pfosfpen 112 5 0 0 1 0 1 1 0 8 0 pfanchor 1280 526 39 14 44 1 43 43 0 8 0 pfqueue 264 19 0 19 6 6 0 1 0 8 0 pfstitem 24 53 0 10 1 0 1 1 0 8 0 pfstkey 128 503 0 487 1 0 1 1 0 8 0 pfstate 352 255 0 232 5 2 3 3 0 8 0 rttmr 136 12 0 12 3 3 0 1 0 8 0 art_heap8 4096 17 0 16 12 11 1 3 0 8 0 art_heap4 256 9564 0 9184 74 47 27 31 0 8 0 art_table 32 9581 0 9200 6 2 4 4 0 8 0 art_node 16 1678 0 1604 1 0 1 1 0 8 0 sysvmsgpl 40 19 0 9 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 7 0 0 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 17821 0 16326 94 0 94 94 0 8 0 ffsino 240 17821 0 16326 88 0 88 88 0 8 0 nchpl 144 34574 0 32934 63 1 62 63 0 8 0 rtmask 32 2 0 2 1 1 0 1 0 8 0 uvmvnodes 80 6500 0 0 133 0 133 133 0 8 0 vnodes 216 6500 0 0 362 0 362 362 0 8 0 namei 1024 131090 0 131090 10 8 2 3 0 8 2 vmpool 664 105 0 105 14 14 0 1 0 8 0 kstatmem 264 532 0 508 4 2 2 3 0 8 0 scsiplug 72 7 0 7 2 2 0 1 0 8 0 scxspl 216 109478 0 109478 30 29 1 8 0 8 1 plimitpl 152 2420 0 2405 1 0 1 1 0 8 0 sigapl 424 13007 0 12940 9 1 8 8 0 8 0 futexpl 64 145757 0 145750 9 8 1 1 0 8 0 knotepl 120 218242 0 218162 126 119 7 15 0 8 3 kqueuepl 184 2769 0 2761 41 40 1 4 0 8 0 pipepl 288 3841 0 3812 85 82 3 7 0 8 0 fdescpl 432 12705 0 12676 4 0 4 4 0 8 0 filepl 120 110338 0 110084 163 151 12 19 0 8 4 lockfpl 104 3859 0 3857 8 7 1 2 0 8 0 lockfspl 48 1089 0 1087 1 0 1 1 0 8 0 sessionpl 144 103 0 87 1 0 1 1 0 8 0 pgrppl 48 194 0 178 1 0 1 1 0 8 0 ucredpl 104 12641 0 12629 1 0 1 1 0 8 0 zombiepl 144 12940 0 12940 3 2 1 1 0 8 1 processpl 1008 13007 0 12940 13 4 9 9 0 8 0 procpl 696 31644 0 31552 34 25 9 10 0 8 0 sosppl 168 135 0 135 20 19 1 1 0 8 1 sockpl 456 40042 0 40002 823 810 13 31 0 8 8 mcl64k 65536 583 0 583 35 34 1 1 0 8 1 mcl16k 16384 298 0 298 35 34 1 1 0 8 1 mcl12k 12288 508 0 508 32 31 1 1 0 8 1 mcl9k 9216 176 0 176 38 37 1 1 0 8 1 mcl8k 8192 1121 0 1118 23 22 1 1 0 8 0 mcl4k 4096 1509 0 1509 18 17 1 1 0 8 1 mcl2k2 2112 112 0 112 37 36 1 1 0 8 1 mcl2k 2048 103639 0 103561 64 52 12 33 0 8 0 mtagpl 96 1754 0 1671 31 27 4 9 0 8 1 mbufpl 256 582947 0 581777 953 879 74 166 0 8 0 bufpl 288 23480 0 16979 465 0 465 465 0 8 0 anonpl 24 2516600 0 2499065 302 182 120 139 0 188 0 amapchunkpl 152 240440 0 239707 124 93 31 41 0 158 0 amappl16 200 25755 0 25155 205 173 32 47 0 8 0 amappl15 192 7 0 6 1 0 1 1 0 8 0 amappl14 184 454 0 442 2 1 1 2 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1383 0 1379 1 0 1 1 0 8 0 amappl11 160 48 0 37 1 0 1 1 0 8 0 amappl10 152 114 0 105 1 0 1 1 0 8 0 amappl9 144 1037 0 1037 11 11 0 1 0 8 0 amappl8 136 560 0 475 4 1 3 4 0 8 0 amappl7 128 354 0 330 2 0 2 2 0 8 0 amappl6 120 578 0 564 2 1 1 2 0 8 0 amappl5 112 646 0 639 1 0 1 1 0 8 0 amappl4 104 1461 0 1435 2 1 1 2 0 8 0 amappl3 96 35658 0 35598 2 0 2 2 0 8 0 amappl2 88 13716 0 13637 3 0 3 3 0 8 0 amappl1 80 285492 0 284717 35 19 16 26 0 8 0 amappl 88 79818 0 79622 6 1 5 5 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 12810 0 12781 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12810 0 12781 1 0 1 1 0 8 0 vmmpekpl 168 99381 0 99334 3 0 3 3 0 8 0 vmmpepl 168 1187120 0 1184167 497 363 134 161 0 357 0 vmsppl 344 12809 0 12781 3 0 3 3 0 8 0 rwobjpl 24 305974 0 297564 55 3 52 53 0 8 0 pdppl 4096 25626 0 25562 860 796 64 68 0 8 0 pvpl 32 4968801 0 4945250 668 460 208 334 0 265 0 pmappl 216 12809 0 12781 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 3133 0 2286 30 4 26 27 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x45 ffs_write(ffff800024a5a940) at ffs_write+0x924 VOP_WRITE(fffffd80671b6048,ffff800024a5a9f0,3,fffffd807f7d72d8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002b422930,fffffd80671b6048,fffffd807f7d72d8,ffff800024a5aab0,ffff800024a5aa90) at ktrwriteraw+0x146 sys/kern/kern_ktrace.c:661 ktrsysret(ffff80002b422930,141,0,ffff800024a5abb0) at ktrsysret+0x158 ktrwrite2 sys/kern/kern_ktrace.c:624 [inline] ktrsysret(ffff80002b422930,141,0,ffff800024a5abb0) at ktrsysret+0x158 sys/kern/kern_ktrace.c:206 syscall(ffff800024a5ac30) at syscall+0x5a7 mi_syscall_return sys/sys/syscall_mi.h:139 [inline] syscall(ffff800024a5ac30) at syscall+0x5a7 sys/arch/amd64/amd64/trap.c:646 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb4546a3a6c0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x45 ffs_write(ffff800024a5a940) at ffs_write+0x924 VOP_WRITE(fffffd80671b6048,ffff800024a5a9f0,3,fffffd807f7d72d8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff80002b422930,fffffd80671b6048,fffffd807f7d72d8,ffff800024a5aab0,ffff800024a5aa90) at ktrwriteraw+0x146 sys/kern/kern_ktrace.c:661 ktrsysret(ffff80002b422930,141,0,ffff800024a5abb0) at ktrsysret+0x158 ktrwrite2 sys/kern/kern_ktrace.c:624 [inline] ktrsysret(ffff80002b422930,141,0,ffff800024a5abb0) at ktrsysret+0x158 sys/kern/kern_ktrace.c:206 syscall(ffff800024a5ac30) at syscall+0x5a7 mi_syscall_return sys/sys/syscall_mi.h:139 [inline] syscall(ffff800024a5ac30) at syscall+0x5a7 sys/arch/amd64/amd64/trap.c:646 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb4546a3a6c0, count: -7