uvm_fault(0xffffffff82cf7d68, 0xffff80001bf7f0fa, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x49: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *464733 18023 0 0 0x1 0 syz-executor.6 memset() at memset+0x49 ffs_write(ffff8000299cc050) at ffs_write+0x924 VOP_WRITE(fffffd8007390640,ffff8000299cc100,3,fffffd807f7d77b8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff800023162888,fffffd8007390640,fffffd807f7d77b8,ffff8000299cc1c0,ffff8000299cc1a0) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:664 ktrstruct(ffff800023162888,ffffffff828101e2,ffff8000299cc278,10) at ktrstruct+0x156 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800023162888,ffffffff828101e2,ffff8000299cc278,10) at ktrstruct+0x156 sys/kern/kern_ktrace.c:308 futex_wait(86a6eb987f0,4,73d191d7f5f0,2) at futex_wait+0x25b sys/kern/sys_futex.c:248 sys_futex(ffff800023162888,ffff8000299cc370,ffff8000299cc3c0) at sys_futex+0xfc sys/kern/sys_futex.c:110 syscall(ffff8000299cc440) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d191d7f660, count: 6 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(0xffffffff82cf7d68, 0xffff80001bf7f0fa, 0, 2) -> d ddb> trace memset() at memset+0x49 ffs_write(ffff8000299cc050) at ffs_write+0x924 VOP_WRITE(fffffd8007390640,ffff8000299cc100,3,fffffd807f7d77b8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff800023162888,fffffd8007390640,fffffd807f7d77b8,ffff8000299cc1c0,ffff8000299cc1a0) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:664 ktrstruct(ffff800023162888,ffffffff828101e2,ffff8000299cc278,10) at ktrstruct+0x156 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800023162888,ffffffff828101e2,ffff8000299cc278,10) at ktrstruct+0x156 sys/kern/kern_ktrace.c:308 futex_wait(86a6eb987f0,4,73d191d7f5f0,2) at futex_wait+0x25b sys/kern/sys_futex.c:248 sys_futex(ffff800023162888,ffff8000299cc370,ffff8000299cc3c0) at sys_futex+0xfc sys/kern/sys_futex.c:110 syscall(ffff8000299cc440) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d191d7f660, count: -9 ddb> show registers rdi 0xffff80001bf7f0fa rsi 0 rbp 0xffff8000299cbf70 rbx 0x1 rdx 0x6 rcx 0x6 rax 0 r8 0x700 r9 0xffff8000299cbec8 r10 0xcdc4a03fec12c4bf r11 0xffff80001bf7f0fa r12 0xfa r13 0xfffffd8064b0e890 r14 0x800 r15 0xfffffd8064b0e878 rip 0xffffffff82339d09 memset+0x49 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff8000299cbd78 ss 0x10 memset+0x49: repe stosb %es:(%rdi) ddb> show proc PROC (syz-executor.6) pid=464733 stat=onproc flags process=0 proc=1 pri=76, usrpri=76, nice=20 forw=0xffffffffffffffff, list=0xffff800023163620,0xffff800023162e08 process=0xffff8000ffff27e0 user=0xffff8000299c7000, vmspace=0xfffffd8069b73740 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *18023 464733 86616 0 7 0x1 syz-executor.6 18023 212820 86616 0 2 0x4000000 syz-executor.6 18023 316711 86616 0 3 0x4000080 fsleep syz-executor.6 14568 434317 9696 0 3 0x80 fsleep syz-executor.3 14568 286006 9696 0 2 0x4000000 syz-executor.3 13297 165090 72819 0 2 0x482 syz-executor.0 33332 327836 1 0 3 0x100083 ttyin getty 68276 259723 72819 0 2 0x482 syz-executor.7 70143 76912 72819 0 2 0x2 syz-executor.2 7925 114565 72819 0 2 0x2 syz-executor.5 34221 182699 72819 0 2 0x2 syz-executor.1 10606 377883 72819 0 2 0x2 syz-executor.4 86616 445032 72819 0 2 0x482 syz-executor.6 36630 123542 0 0 3 0x14200 acct acct 1355 87155 0 0 3 0x14280 nfsidl nfsio 61605 218797 0 0 3 0x14280 nfsidl nfsio 82493 148260 0 0 3 0x14280 nfsidl nfsio 44208 420261 0 0 3 0x14280 nfsidl nfsio 59843 131267 0 0 3 0x14280 nfsidl nfsio 9069 355679 0 0 3 0x14280 nfsidl nfsio 83424 278139 0 0 3 0x14280 nfsidl nfsio 10612 220770 0 0 3 0x14280 nfsidl nfsio 18415 326055 0 0 3 0x14280 nfsidl nfsio 65978 301132 0 0 3 0x14280 nfsidl nfsio 60753 79535 0 0 3 0x14280 nfsidl nfsio 42164 441134 0 0 3 0x14280 nfsidl nfsio 95345 316703 0 0 3 0x14280 nfsidl nfsio 13132 322028 0 0 3 0x14280 nfsidl nfsio 51178 241772 0 0 3 0x14280 nfsidl nfsio 861 327664 0 0 3 0x14280 nfsidl nfsio 94922 505161 0 0 3 0x14280 nfsidl nfsio 11718 177569 0 0 3 0x14280 nfsidl nfsio 42093 135705 0 0 3 0x14280 nfsidl nfsio 51980 518383 0 0 3 0x14280 nfsidl nfsio 12626 209463 0 0 3 0x14200 bored sosplice 9696 108238 72819 0 2 0x482 syz-executor.3 72819 316097 99210 0 3 0x82 wait syz-fuzzer 72819 253338 99210 0 2 0x4000482 syz-fuzzer 72819 89343 99210 0 3 0x4000082 wait syz-fuzzer 72819 217239 99210 0 3 0x4000082 kqread syz-fuzzer 72819 344522 99210 0 3 0x4000082 wait syz-fuzzer 72819 327077 99210 0 3 0x4000082 thrsleep syz-fuzzer 72819 331047 99210 0 3 0x4000082 thrsleep syz-fuzzer 72819 487759 99210 0 3 0x4000082 wait syz-fuzzer 72819 394713 99210 0 3 0x4000082 wait syz-fuzzer 72819 8955 99210 0 3 0x4000082 thrsleep syz-fuzzer 72819 150068 99210 0 3 0x4000082 thrsleep syz-fuzzer 72819 383709 99210 0 3 0x4000082 wait syz-fuzzer 72819 504955 99210 0 3 0x4000082 wait syz-fuzzer 72819 272567 99210 0 3 0x4000082 wait syz-fuzzer 99210 24054 15977 0 3 0x10008a sigsusp ksh 15977 417227 87433 0 3 0x9a kqread sshd 87433 383528 1 0 3 0x88 kqread sshd 98201 501662 97674 73 3 0x1100090 kqread syslogd 97674 443623 1 0 3 0x100082 netio syslogd 51167 260574 1 0 3 0x100080 kqread resolvd 12546 405320 35423 77 3 0x100092 kqread dhcpleased 62152 464944 35423 77 3 0x100092 kqread dhcpleased 35423 461503 1 0 3 0x80 kqread dhcpleased 86289 438261 0 0 3 0x14200 bored smr 4702 68476 0 0 2 0x14200 zerothread 47305 515669 0 0 3 0x14200 aiodoned aiodoned 6247 328330 0 0 3 0x14200 syncer update 67037 120933 0 0 3 0x14200 cleaner cleaner 31211 268834 0 0 3 0x14200 reaper reaper 87093 346252 0 0 3 0x14200 pgdaemon pagedaemon 8771 176234 0 0 3 0x14200 bored viomb 96968 270069 0 0 3 0x40014200 acpi0 acpi0 80416 316075 0 0 3 0x14200 bored softnet3 14986 197784 0 0 3 0x14200 bored softnet2 3546 398599 0 0 3 0x14200 bored softnet1 38291 356001 0 0 3 0x14200 bored softnet0 55091 304590 0 0 3 0x14200 bored systqmp 1742 515479 0 0 3 0x14200 bored systq 87763 376549 0 0 2 0x40014200 softclock 4684 308199 0 0 3 0x40014200 idle0 1 61840 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 10171 6419K 7503K 78643K 20998 0 pcb 13 16K 18K 78643K 329 0 rtable 239 7K 7K 78643K 987 0 pf 29 8K 9K 78643K 345 0 ifaddr 43 13K 14K 78643K 232 0 ifgroup 50 2K 2K 78643K 544 0 sysctl 2 0K 0K 78643K 2 0 counters 28 17K 17K 78643K 156 0 ioctlops 0 0K 2K 78643K 194 0 iov 0 0K 32K 78643K 705 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1574 98K 99K 78643K 4873 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 9K 78643K 114 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 2371 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 12 41K 69K 78643K 7627 0 sigio 0 0K 0K 78643K 200 0 proc 58 59K 75K 78643K 1282 0 subproc 104 6K 6K 78643K 325 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 522 0 in_multi 99 7K 7K 78643K 346 0 ether_multi 1 0K 0K 78643K 1 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 85 387K 387K 78643K 85 0 exec 0 0K 1K 78643K 1815 0 pfkey data 0 0K 0K 78643K 1 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 355 93K 103K 78643K 71897 0 UVM aobj 131 4K 4K 78643K 135 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 239 0 NDP 11 0K 2K 78643K 189 0 temp 74 5864K 5960K 78643K 61350 0 kqueue 12 18K 24K 78643K 576 0 SYN cache 2 16K 24K 78643K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 372 0 369 7 4 3 3 0 8 2 rtentry 112 319 0 208 4 0 4 4 0 8 0 unpcb 144 5168 0 5155 55 49 6 10 0 8 5 syncache 296 48 0 48 10 9 1 1 0 8 1 sackhl 24 3 0 3 3 3 0 1 0 8 0 tcpqe 32 87 0 87 7 6 1 1 0 8 1 tcpcb 808 8919 0 8915 146 132 14 15 0 8 13 arp 88 52 0 34 1 0 1 1 0 8 0 ipq 40 104 0 103 4 3 1 1 0 8 0 ipqe 40 317 0 316 4 3 1 1 0 8 0 inpcb 336 11352 0 11345 120 110 10 13 0 8 9 nd6 104 83 0 58 1 0 1 1 0 8 0 pkpcb 40 15 0 15 4 4 0 1 0 8 0 kcovpl 48 25 0 17 1 0 1 1 0 8 0 ppxss 1160 39 0 39 11 11 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1258 0 788 34 4 30 30 0 8 0 art_table 32 1259 0 788 4 0 4 4 0 8 0 art_node 16 305 0 204 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 4 1 0 1 1 0 8 0 semapl 112 2369 0 2359 1 0 1 1 0 8 0 shmpl 112 132 0 4 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11772 0 10272 94 0 94 94 0 8 0 ffsino 240 11772 0 10272 89 0 89 89 0 8 0 nchpl 144 22533 0 22039 63 41 22 63 0 8 0 uvmvnodes 80 14010 0 0 286 0 286 286 0 8 0 vnodes 216 14010 0 0 779 0 779 779 0 8 0 namei 1024 77778 0 77777 6 5 1 3 0 8 0 kstatmem 264 278 0 256 2 0 2 2 0 8 0 scxspl 216 65435 0 65435 27 26 1 8 0 8 1 plimitpl 152 849 0 834 1 0 1 1 0 8 0 sigapl 424 7912 0 7849 8 0 8 8 0 8 0 futexpl 64 77609 0 77607 1 0 1 1 0 8 0 knotepl 120 71000 0 70920 17 13 4 9 0 8 0 kqueuepl 184 1174 0 1166 12 11 1 4 0 8 0 pipepl 288 1616 0 1588 31 28 3 7 0 8 0 fdescpl 432 7874 0 7850 4 0 4 4 0 8 0 filepl 120 52173 0 51937 74 60 14 17 0 8 4 lockfpl 104 2414 0 2411 5 4 1 2 0 8 0 lockfspl 48 1045 0 1042 1 0 1 1 0 8 0 sessionpl 144 42 0 26 1 0 1 1 0 8 0 pgrppl 48 60 0 44 1 0 1 1 0 8 0 ucredpl 104 8782 0 8767 1 0 1 1 0 8 0 zombiepl 144 7851 0 7849 2 1 1 1 0 8 0 processpl 1008 7912 0 7849 10 1 9 9 0 8 0 procpl 696 19243 0 19164 18 9 9 10 0 8 0 sosppl 168 87 0 87 9 8 1 1 0 8 1 sockpl 456 17032 0 17009 354 338 16 41 0 8 13 mcl64k 65536 359 0 359 17 16 1 1 0 8 1 mcl16k 16384 169 0 169 22 21 1 1 0 8 1 mcl12k 12288 383 0 383 19 19 0 1 0 8 0 mcl9k 9216 158 0 158 19 19 0 1 0 8 0 mcl8k 8192 410 0 410 19 19 0 1 0 8 0 mcl4k 4096 913 0 913 20 19 1 10 0 8 1 mcl2k2 2112 61 0 61 18 18 0 1 0 8 0 mcl2k 2048 77838 0 77787 46 38 8 32 0 8 0 mtagpl 96 1151 0 859 17 5 12 13 0 8 0 mbufpl 256 208206 0 207823 530 491 39 167 0 8 0 bufpl 288 18887 0 12502 457 0 457 457 0 8 0 anonpl 24 844302 0 833746 210 129 81 102 0 188 1 amapchunkpl 152 227416 0 226694 86 53 33 42 0 158 1 amappl16 200 19251 0 18870 111 90 21 34 0 8 0 amappl15 192 14 0 14 1 1 0 1 0 8 0 amappl14 184 205 0 192 2 0 2 2 0 8 0 amappl13 176 6 0 5 1 0 1 1 0 8 0 amappl12 168 8759 0 8734 2 0 2 2 0 8 0 amappl11 160 61 0 50 1 0 1 1 0 8 0 amappl10 152 59 0 49 1 0 1 1 0 8 0 amappl9 144 276 0 275 2 1 1 2 0 8 0 amappl8 136 472 0 369 4 0 4 4 0 8 0 amappl7 128 92 0 76 1 0 1 1 0 8 0 amappl6 120 406 0 382 2 1 1 2 0 8 0 amappl5 112 371 0 365 1 0 1 1 0 8 0 amappl4 104 913 0 877 4 2 2 2 0 8 0 amappl3 96 45299 0 45230 3 0 3 3 0 8 0 amappl2 88 8265 0 8206 4 2 2 3 0 8 0 amappl1 80 37640 0 37143 22 10 12 22 0 8 0 amappl 88 71078 0 70874 6 0 6 6 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 72 134 0 4 3 0 3 3 0 8 0 uaddrrnd 24 7874 0 7850 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7874 0 7850 1 0 1 1 0 8 0 vmmpekpl 168 56440 0 56382 3 0 3 3 0 8 0 vmmpepl 168 473498 0 471428 278 160 118 125 0 357 12 vmsppl 368 7873 0 7850 3 0 3 3 0 8 0 rwobjpl 24 129023 0 113489 96 2 94 94 0 8 0 pdppl 4096 15755 0 15700 452 389 63 67 0 8 8 pvpl 32 2154419 0 2138628 467 315 152 334 0 265 1 pmappl 216 7873 0 7850 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2093 0 1274 30 4 26 28 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x49 ffs_write(ffff8000299cc050) at ffs_write+0x924 VOP_WRITE(fffffd8007390640,ffff8000299cc100,3,fffffd807f7d77b8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff800023162888,fffffd8007390640,fffffd807f7d77b8,ffff8000299cc1c0,ffff8000299cc1a0) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:664 ktrstruct(ffff800023162888,ffffffff828101e2,ffff8000299cc278,10) at ktrstruct+0x156 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800023162888,ffffffff828101e2,ffff8000299cc278,10) at ktrstruct+0x156 sys/kern/kern_ktrace.c:308 futex_wait(86a6eb987f0,4,73d191d7f5f0,2) at futex_wait+0x25b sys/kern/sys_futex.c:248 sys_futex(ffff800023162888,ffff8000299cc370,ffff8000299cc3c0) at sys_futex+0xfc sys/kern/sys_futex.c:110 syscall(ffff8000299cc440) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d191d7f660, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x49 ffs_write(ffff8000299cc050) at ffs_write+0x924 VOP_WRITE(fffffd8007390640,ffff8000299cc100,3,fffffd807f7d77b8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245 ktrwriteraw(ffff800023162888,fffffd8007390640,fffffd807f7d77b8,ffff8000299cc1c0,ffff8000299cc1a0) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:664 ktrstruct(ffff800023162888,ffffffff828101e2,ffff8000299cc278,10) at ktrstruct+0x156 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800023162888,ffffffff828101e2,ffff8000299cc278,10) at ktrstruct+0x156 sys/kern/kern_ktrace.c:308 futex_wait(86a6eb987f0,4,73d191d7f5f0,2) at futex_wait+0x25b sys/kern/sys_futex.c:248 sys_futex(ffff800023162888,ffff8000299cc370,ffff8000299cc3c0) at sys_futex+0xfc sys/kern/sys_futex.c:110 syscall(ffff8000299cc440) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73d191d7f660, count: -9