uvm_fault(0xffffffff82ac6228, 0xffff8000181cf580, 0, 2) -> d kernel: page fault trap, code=0 Stopped at memset+0x4e: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND memset() at memset+0x4e ffs_write(ffff800024bff8a0) at ffs_write+0x93c VOP_WRITE(fffffd8063e6dc08,ffff800024bff938,23,fffffd807f7d7958) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8063e6dc08,ffff800024bffa28,40,0,1,aad92e706092b7c1,0,ffff8000216f07e0,fffffd8063e6dc08) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324 acct_process(ffff8000216f07e0) at acct_process+0x62c sys/kern/kern_acct.c:243 exit1(ffff8000216f07e0,0,0,3) at exit1+0x387 sys/kern/kern_exit.c:209 single_thread_check_locked(ffff8000216f07e0,0,0) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2034 userret(ffff8000216f07e0) at userret+0x209 single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff8000216f07e0) at userret+0x209 sys/kern/kern_sig.c:2004 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x7f7fffffb600, 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(0xffffffff82ac6228, 0xffff8000181cf580, 0, 2) -> d ddb> trace memset() at memset+0x4e ffs_write(ffff800024bff8a0) at ffs_write+0x93c VOP_WRITE(fffffd8063e6dc08,ffff800024bff938,23,fffffd807f7d7958) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8063e6dc08,ffff800024bffa28,40,0,1,aad92e706092b7c1,0,ffff8000216f07e0,fffffd8063e6dc08) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324 acct_process(ffff8000216f07e0) at acct_process+0x62c sys/kern/kern_acct.c:243 exit1(ffff8000216f07e0,0,0,3) at exit1+0x387 sys/kern/kern_exit.c:209 single_thread_check_locked(ffff8000216f07e0,0,0) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2034 userret(ffff8000216f07e0) at userret+0x209 single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff8000216f07e0) at userret+0x209 sys/kern/kern_sig.c:2004 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x7f7fffffb600, count: -9 ddb> show registers rdi 0xffff8000181cf580 rsi 0 rbp 0xffff800024bff7c0 rbx 0x1 rdx 0 rcx 0x50 rax 0 r8 0x280 r9 0xffff800024bff718 r10 0xf4a11a78aa68eec r11 0xffff8000181cf580 r12 0xc580 __ALIGN_SIZE+0xb580 r13 0xfffffd8072a7ad38 r14 0x800 r15 0xfffffd8072a7ad20 rip 0xffffffff81f99abe memset+0x4e cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff800024bff5c8 ss 0x10 memset+0x4e: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor.4) pid=366322 stat=onproc flags process=1008 proc=82000 pri=32, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff800024c0bcf0,0xffff8000216f02b0 process=0xffff800021776fe8 user=0xffff800024bfa000, vmspace=0xfffffd80695d1ee0 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 79755 47496 65189 0 2 0 syz-executor.2 79755 90020 65189 0 3 0x4000080 fsleep syz-executor.2 79755 298073 65189 0 2 0x4000000 syz-executor.2 79755 19849 65189 0 3 0x4000080 fsleep syz-executor.2 27469 470950 76060 0 2 0x480 syz-executor.3 27469 287300 76060 0 2 0x4000000 syz-executor.3 27469 515056 76060 0 3 0x4000080 fsleep syz-executor.3 36702 37883 7090 0 2 0 syz-executor.6 36702 101477 7090 0 3 0x4000080 fsleep syz-executor.6 56966 54226 60422 0 2 0x2 syz-executor.5 10586 484426 60422 0 3 0x82 piperd syz-executor.0 21239 176219 1 0 3 0x100083 ttyin getty 7090 155242 60422 0 2 0x482 syz-executor.6 54397 307536 60422 0 3 0x82 piperd syz-executor.7 65189 188195 60422 0 2 0x482 syz-executor.2 96782 178310 60422 0 2 0x482 syz-executor.4 76060 350825 60422 0 2 0x482 syz-executor.3 77912 424630 0 0 3 0x14200 acct acct 35722 36553 0 0 3 0x14280 nfsidl nfsio 97899 374575 0 0 3 0x14280 nfsidl nfsio 65577 497504 0 0 3 0x14280 nfsidl nfsio 44056 431115 0 0 3 0x14280 nfsidl nfsio 50971 185407 0 0 3 0x14280 nfsidl nfsio 49383 305178 0 0 3 0x14280 nfsidl nfsio 84225 114906 0 0 3 0x14280 nfsidl nfsio 11344 369024 0 0 3 0x14280 nfsidl nfsio 55980 156815 0 0 3 0x14280 nfsidl nfsio 43587 492916 0 0 3 0x14280 nfsidl nfsio 77498 490913 0 0 3 0x14280 nfsidl nfsio 50775 101193 0 0 3 0x14280 nfsidl nfsio 93907 503573 0 0 3 0x14280 nfsidl nfsio 57958 151357 0 0 3 0x14280 nfsidl nfsio 7933 90733 0 0 3 0x14280 nfsidl nfsio 43173 391289 0 0 3 0x14280 nfsidl nfsio 39405 462620 0 0 3 0x14280 nfsidl nfsio 29702 299263 0 0 3 0x14280 nfsidl nfsio 50316 186002 0 0 3 0x14280 nfsidl nfsio 92904 39237 0 0 3 0x14280 nfsidl nfsio 24671 229670 0 0 3 0x14200 bored sosplice 60422 195475 157 0 3 0x82 wait syz-fuzzer 60422 108538 157 0 3 0x4000082 thrsleep syz-fuzzer 60422 331278 157 0 3 0x4000082 wait syz-fuzzer 60422 81404 157 0 3 0x4000082 wait syz-fuzzer 60422 486150 157 0 3 0x4000082 thrsleep syz-fuzzer 60422 215292 157 0 3 0x4000082 thrsleep syz-fuzzer 60422 163264 157 0 3 0x4000082 thrsleep syz-fuzzer 60422 211276 157 0 3 0x4000082 wait syz-fuzzer 60422 422231 157 0 3 0x4000082 thrsleep syz-fuzzer 60422 418196 157 0 3 0x4000082 kqread syz-fuzzer 60422 184674 157 0 3 0x4000082 wait syz-fuzzer 60422 398292 157 0 3 0x4000082 wait syz-fuzzer 60422 219855 157 0 3 0x4000082 thrsleep syz-fuzzer 60422 74153 157 0 3 0x4000082 wait syz-fuzzer 157 37929 56070 0 3 0x10008a sigsusp ksh 56070 130645 94572 0 3 0x9a kqread sshd 94572 190976 1 0 3 0x88 kqread sshd 82944 500127 36994 73 3 0x1100090 kqread syslogd 36994 133828 1 0 3 0x100082 netio syslogd 51751 46308 1 0 3 0x100080 kqread resolvd 10396 471446 6995 77 3 0x100092 kqread dhcpleased 24425 335650 6995 77 3 0x100092 kqread dhcpleased 6995 221777 1 0 3 0x80 kqread dhcpleased 58137 340421 0 0 3 0x14200 bored smr 43869 204331 0 0 2 0x14200 zerothread 50665 317356 0 0 3 0x14200 aiodoned aiodoned 77771 52014 0 0 3 0x14200 syncer update 59276 323203 0 0 3 0x14200 cleaner cleaner 40928 437720 0 0 3 0x14200 reaper reaper 74138 456457 0 0 3 0x14200 pgdaemon pagedaemon 92325 335329 0 0 3 0x14200 bored viomb 29662 147633 0 0 3 0x40014200 acpi0 acpi0 91105 88281 0 0 3 0x14200 bored softnet 15320 403750 0 0 3 0x14200 bored softnet 35734 254557 0 0 3 0x14200 bored softnet 85745 383976 0 0 3 0x14200 bored softnet 93826 268834 0 0 3 0x14200 bored systqmp 72635 278399 0 0 3 0x14200 bored systq 60277 305858 0 0 2 0x40014200 softclock 59152 348787 0 0 3 0x40014200 idle0 1 194280 0 0 3 0x80082 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 10228 7027K 7748K 78643K 45065 0 pcb 13 16K 18K 78643K 3130 0 rtable 227 22K 25K 78643K 6391 0 ifaddr 205 49K 52K 78643K 2207 0 sysctl 3 1K 4K 78643K 54 0 counters 25 17K 17K 78643K 246 0 ioctlops 0 0K 4K 78643K 5548 0 iov 0 0K 20K 78643K 2516 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1392 87K 88K 78643K 11438 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 163 0 VM map 2 0K 0K 78643K 2 0 sem 9 20K 36K 78643K 36 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 12 41K 73K 78643K 20079 0 sigio 0 0K 0K 78643K 225 0 proc 64 59K 91K 78643K 4110 0 subproc 91 5K 6K 78643K 1417 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 739 0 in_multi 70 4K 6K 78643K 1470 0 ether_multi 2 0K 0K 78643K 38 0 mrt 3 0K 0K 78643K 47 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 283 1261K 1261K 78643K 283 0 exec 0 0K 2K 78643K 6100 0 pfkey data 0 0K 0K 78643K 7 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 323 274K 293K 78643K 107788 0 UVM aobj 131 4K 4K 78643K 147 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 631 0 NDP 14 0K 2K 78643K 464 0 temp 139 4734K 66423K 78643K 221844 0 kqueue 12 18K 28K 78643K 1359 0 SYN cache 2 20K 28K 78643K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 1664 0 1661 22 21 1 4 0 8 0 rtentry 112 1411 0 1344 4 1 3 4 0 8 0 unpcb 144 16639 0 16624 180 179 1 10 0 8 0 syncache 296 125 0 125 29 29 0 1 0 8 0 tcpqe 32 88 0 88 18 18 0 1 0 8 0 tcpcb 768 7452 0 7447 302 300 2 27 0 8 0 arp 88 233 0 221 1 0 1 1 0 8 0 ipq 40 19 0 18 10 9 1 1 0 8 0 ipqe 40 67 0 66 10 9 1 1 0 8 0 inpcb 336 17937 0 17929 299 292 7 17 0 8 6 nd6 48 345 0 332 1 0 1 1 0 8 0 pkpcb 40 66 0 66 13 12 1 1 0 8 1 kcovpl 48 109 0 102 1 0 1 1 0 8 0 ppxss 1160 65 0 65 15 15 0 1 0 8 0 pfstscr 40 43 0 31 1 0 1 1 0 8 0 pfosfp 40 7 0 4 1 0 1 1 0 8 0 pfosfpen 112 7 0 4 1 0 1 1 0 8 0 pfrktable 1344 612 0 589 13 11 2 3 0 8 0 pfanchor 1280 588 0 382 21 3 18 18 0 8 0 pftag 88 89 0 81 2 1 1 1 0 8 0 pfqueue 264 38 0 38 2 2 0 1 0 8 0 pfstitem 24 18 0 0 1 0 1 1 0 8 0 pfstkey 120 78 0 69 1 0 1 1 0 8 0 pfstate 336 39 0 30 1 0 1 1 0 8 0 pfrule 1360 1616 0 1241 37 5 32 32 0 8 0 rttmr 136 9 0 9 3 3 0 1 0 8 0 art_heap8 4096 16 0 15 13 12 1 3 0 8 0 art_heap4 256 6292 0 5975 81 51 30 30 0 8 2 art_table 32 6308 0 5990 6 2 4 4 0 8 0 art_node 16 1397 0 1341 1 0 1 1 0 8 0 sysvmsgpl 40 19 0 11 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 7 0 0 1 0 1 1 0 8 0 shmpl 112 144 0 16 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 25904 0 24392 95 0 95 95 0 8 0 ffsino 240 25904 0 24392 91 1 90 90 0 8 0 nchpl 144 51998 0 51506 63 38 25 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 225051 0 225050 9 8 1 2 0 8 0 vcpupl 2048 47 0 0 6 0 6 6 0 8 0 vmpool 536 47 0 0 4 0 4 4 0 8 0 pfiaddrpl 120 205 0 178 3 2 1 1 0 8 0 kstatmem 264 456 0 428 3 0 3 3 0 8 0 scsiplug 72 25 0 25 8 8 0 1 0 8 0 scxspl 216 153048 0 153048 50 47 3 8 0 8 3 plimitpl 152 2837 0 2823 1 0 1 1 0 8 0 sigapl 424 20188 0 20126 8 0 8 8 0 8 0 futexpl 64 197654 0 197650 3 2 1 1 0 8 0 knotepl 120 308211 0 308137 159 149 10 18 0 8 6 kqueuepl 184 3740 0 3732 53 52 1 6 0 8 0 pipepl 288 3547 0 3522 71 66 5 9 0 8 2 fdescpl 432 20149 0 20126 4 0 4 4 0 8 0 filepl 120 161132 0 160748 203 191 12 17 0 8 0 lockfpl 104 5799 0 5797 15 14 1 2 0 8 0 lockfspl 48 1317 0 1315 1 0 1 1 0 8 0 sessionpl 144 128 0 113 1 0 1 1 0 8 0 pgrppl 48 294 0 279 1 0 1 1 0 8 0 ucredpl 104 22125 0 22112 1 0 1 1 0 8 0 zombiepl 144 20127 0 20126 4 3 1 1 0 8 0 processpl 1000 20188 0 20126 10 1 9 9 0 8 0 procpl 672 49622 0 49541 37 28 9 9 0 8 1 sosppl 168 172 0 172 28 28 0 1 0 8 0 sockpl 456 36359 0 36324 746 733 13 34 0 8 8 mcl64k 65536 746 0 737 7 5 2 2 0 8 0 mcl16k 16384 284 0 284 46 45 1 1 0 8 1 mcl12k 12288 631 0 631 51 50 1 1 0 8 1 mcl9k 9216 222 0 222 51 50 1 1 0 8 1 mcl8k 8192 1037 0 1037 49 48 1 1 0 8 1 mcl4k 4096 2218 0 2218 32 31 1 3 0 8 1 mcl2k2 2112 128 0 128 51 50 1 1 0 8 1 mcl2k 2048 113252 0 113188 45 35 10 19 0 8 0 mtagpl 96 3346 0 3270 33 30 3 14 0 8 0 mbufpl 256 350094 0 349832 1357 1327 30 428 0 8 0 bufpl 288 37430 0 31016 460 1 459 459 0 8 0 anonpl 24 3767811 0 3753163 247 127 120 135 0 188 0 amapchunkpl 152 349910 0 349288 151 114 37 40 0 158 10 amappl16 200 55229 0 54543 206 168 38 53 0 8 0 amappl15 192 2695 0 2693 1 0 1 1 0 8 0 amappl14 184 1847 0 1841 1 0 1 1 0 8 0 amappl13 176 3729 0 3726 1 0 1 1 0 8 0 amappl12 168 2766 0 2758 1 0 1 1 0 8 0 amappl11 160 3327 0 3310 1 0 1 1 0 8 0 amappl10 152 2930 0 2926 1 0 1 1 0 8 0 amappl9 144 2382 0 2380 1 0 1 1 0 8 0 amappl8 136 4041 0 3944 5 1 4 4 0 8 0 amappl7 128 2133 0 2109 1 0 1 1 0 8 0 amappl6 120 2649 0 2633 2 1 1 2 0 8 0 amappl5 112 16077 0 16061 1 0 1 1 0 8 0 amappl4 104 8353 0 8323 2 1 1 2 0 8 0 amappl3 96 61094 0 61042 2 0 2 2 0 8 0 amappl2 88 6257 0 6203 3 1 2 2 0 8 0 amappl1 80 486944 0 486242 25 8 17 21 0 8 0 amappl 88 105437 0 105261 5 0 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 72 146 0 16 3 0 3 3 0 8 0 uaddrrnd 24 20196 0 20125 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 20196 0 20125 1 0 1 1 0 8 0 vmmpekpl 168 140430 0 140365 4 0 4 4 0 8 0 vmmpepl 168 1975695 0 1972979 404 260 144 167 0 357 1 vmsppl 272 20195 0 20125 10 4 6 6 0 8 0 rwobjpl 24 461827 0 453963 50 0 50 50 0 8 0 pdppl 4096 40398 0 40297 1275 1168 107 111 0 8 6 pvpl 32 7442578 0 7423090 516 317 199 250 0 265 2 pmappl 216 20195 0 20125 5 0 5 5 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 3990 0 3101 42 14 28 37 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x4e ffs_write(ffff800024bff8a0) at ffs_write+0x93c VOP_WRITE(fffffd8063e6dc08,ffff800024bff938,23,fffffd807f7d7958) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8063e6dc08,ffff800024bffa28,40,0,1,aad92e706092b7c1,0,ffff8000216f07e0,fffffd8063e6dc08) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324 acct_process(ffff8000216f07e0) at acct_process+0x62c sys/kern/kern_acct.c:243 exit1(ffff8000216f07e0,0,0,3) at exit1+0x387 sys/kern/kern_exit.c:209 single_thread_check_locked(ffff8000216f07e0,0,0) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2034 userret(ffff8000216f07e0) at userret+0x209 single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff8000216f07e0) at userret+0x209 sys/kern/kern_sig.c:2004 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x7f7fffffb600, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x4e ffs_write(ffff800024bff8a0) at ffs_write+0x93c VOP_WRITE(fffffd8063e6dc08,ffff800024bff938,23,fffffd807f7d7958) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8063e6dc08,ffff800024bffa28,40,0,1,aad92e706092b7c1,0,ffff8000216f07e0,fffffd8063e6dc08) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324 acct_process(ffff8000216f07e0) at acct_process+0x62c sys/kern/kern_acct.c:243 exit1(ffff8000216f07e0,0,0,3) at exit1+0x387 sys/kern/kern_exit.c:209 single_thread_check_locked(ffff8000216f07e0,0,0) at single_thread_check_locked+0x1f6 sys/kern/kern_sig.c:2034 userret(ffff8000216f07e0) at userret+0x209 single_thread_check sys/kern/kern_sig.c:2054 [inline] userret(ffff8000216f07e0) at userret+0x209 sys/kern/kern_sig.c:2004 Xsyscall() at Xsyscall+0x156 end of kernel end trace frame: 0x7f7fffffb600, count: -9