uvm_fault(0xffffffff82bcbd30, 0xffff80001e6f1280, 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(ffff80002ccc7b80) at ffs_write+0x924 VOP_WRITE(fffffd806632f1f8,ffff80002ccc7c18,23,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806632f1f8,ffff80002ccc7d08,40,0,1,352af5314b6644e1,0,ffff8000fffed078,fffffd806632f1f8) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324 acct_process(ffff8000fffed078) at acct_process+0x62c sys/kern/kern_acct.c:243 exit1(ffff8000fffed078,0,0,1) at exit1+0x387 sys/kern/kern_exit.c:209 sys_exit(ffff8000fffed078,ffff80002ccc7e80,ffff80002ccc7ed0) at sys_exit+0x16 sys/kern/kern_exit.c:89 syscall(ffff80002ccc7f50) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbbe10, 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(0xffffffff82bcbd30, 0xffff80001e6f1280, 0, 2) -> d ddb> trace memset() at memset+0x4e ffs_write(ffff80002ccc7b80) at ffs_write+0x924 VOP_WRITE(fffffd806632f1f8,ffff80002ccc7c18,23,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806632f1f8,ffff80002ccc7d08,40,0,1,352af5314b6644e1,0,ffff8000fffed078,fffffd806632f1f8) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324 acct_process(ffff8000fffed078) at acct_process+0x62c sys/kern/kern_acct.c:243 exit1(ffff8000fffed078,0,0,1) at exit1+0x387 sys/kern/kern_exit.c:209 sys_exit(ffff8000fffed078,ffff80002ccc7e80,ffff80002ccc7ed0) at sys_exit+0x16 sys/kern/kern_exit.c:89 syscall(ffff80002ccc7f50) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbbe10, count: -9 ddb> show registers rdi 0xffff80001e6f1280 rsi 0 rbp 0xffff80002ccc7aa0 rbx 0x1 rdx 0 rcx 0xb0 rax 0 r8 0x580 r9 0xffff80002ccc79f8 r10 0xd8758f8670696361 r11 0xffff80001e6f1280 r12 0x6280 __ALIGN_SIZE+0x5280 r13 0xfffffd806d61b208 r14 0x2800 __ALIGN_SIZE+0x1800 r15 0xfffffd806d61b1f0 rip 0xffffffff8174c62e memset+0x4e cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002ccc78a8 ss 0x10 memset+0x4e: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor.4) pid=301216 stat=onproc flags process=1008 proc=2000 pri=32, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffec2e0,0xffff8000fffed340 process=0xffff8000fffee7f0 user=0xffff80002ccc3000, vmspace=0xfffffd8072856818 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 75023 191759 10623 0 2 0 syz-executor.7 75023 467554 10623 0 3 0x4000080 fsleep syz-executor.7 20123 84724 43191 0 2 0 syz-executor.6 20123 21251 43191 0 3 0x4000080 fsleep syz-executor.6 99320 442704 25317 0 2 0 syz-executor.0 99320 471003 25317 0 3 0x4000080 fsleep syz-executor.0 2019 202359 35955 0 4 0x82000 syz-executor.1 2019 102296 35955 0 3 0x4082000 smrbar syz-executor.1 2019 215241 35955 0 3 0x4002000 suspend syz-executor.1 63478 434012 41741 0 2 0x10 syz-executor.5 63478 89326 41741 0 3 0x4000090 fsleep syz-executor.5 79452 85501 25532 0 2 0 syz-executor.3 79452 79697 25532 0 3 0x4000080 fsleep syz-executor.3 58853 307275 93721 0 2 0 syz-executor.2 58853 362243 93721 0 3 0x4000080 fsleep syz-executor.2 41741 102536 84874 0 3 0x82 nanoslp syz-executor.5 94815 59208 84874 0 3 0x82 nanoslp syz-executor.4 54628 235060 0 0 3 0x14200 acct acct 93721 256800 84874 0 3 0x82 nanoslp syz-executor.2 25532 497881 84874 0 3 0x82 nanoslp syz-executor.3 10623 263622 84874 0 3 0x82 nanoslp syz-executor.7 43191 400338 84874 0 3 0x82 nanoslp syz-executor.6 35955 208513 84874 0 3 0x82 nanoslp syz-executor.1 25317 51479 84874 0 3 0x82 nanoslp syz-executor.0 38369 329081 0 0 3 0x14280 nfsidl nfsio 32095 18426 0 0 3 0x14280 nfsidl nfsio 84049 397495 0 0 3 0x14280 nfsidl nfsio 5529 40996 0 0 3 0x14280 nfsidl nfsio 6681 493269 0 0 3 0x14280 nfsidl nfsio 17748 260010 0 0 3 0x14280 nfsidl nfsio 85177 14169 0 0 3 0x14280 nfsidl nfsio 42014 289348 0 0 3 0x14280 nfsidl nfsio 62809 302710 0 0 3 0x14280 nfsidl nfsio 5431 140265 0 0 3 0x14280 nfsidl nfsio 11559 432266 0 0 3 0x14280 nfsidl nfsio 76587 354108 0 0 3 0x14280 nfsidl nfsio 44823 25068 0 0 3 0x14280 nfsidl nfsio 10162 433458 0 0 3 0x14280 nfsidl nfsio 24413 166840 0 0 3 0x14280 nfsidl nfsio 48902 114781 0 0 3 0x14280 nfsidl nfsio 88756 176005 0 0 3 0x14280 nfsidl nfsio 60983 335988 0 0 3 0x14280 nfsidl nfsio 65000 139513 0 0 3 0x14280 nfsidl nfsio 80484 332757 0 0 3 0x14280 nfsidl nfsio 50291 84332 0 0 3 0x14200 bored sosplice 84874 33130 45969 0 3 0x82 wait syz-fuzzer 84874 181624 45969 0 3 0x4000082 nanoslp syz-fuzzer 84874 252546 45969 0 3 0x4000082 thrsleep syz-fuzzer 84874 481061 45969 0 3 0x4000082 wait syz-fuzzer 84874 374564 45969 0 3 0x4000082 wait syz-fuzzer 84874 439562 45969 0 3 0x4000082 kqread syz-fuzzer 84874 406343 45969 0 3 0x4000082 wait syz-fuzzer 84874 208807 45969 0 3 0x4000082 thrsleep syz-fuzzer 84874 469931 45969 0 3 0x4000082 wait syz-fuzzer 84874 309746 45969 0 3 0x4000082 wait syz-fuzzer 84874 441265 45969 0 3 0x4000082 thrsleep syz-fuzzer 84874 138923 45969 0 3 0x4000082 wait syz-fuzzer 84874 156922 45969 0 3 0x4000082 thrsleep syz-fuzzer 84874 31552 45969 0 3 0x4000082 wait syz-fuzzer 45969 76905 99977 0 3 0x10008a sigsusp ksh 99977 414058 46505 0 3 0x9a kqread sshd 82609 321280 1 0 3 0x100083 ttyin getty 46505 392837 1 0 3 0x88 kqread sshd 41200 400605 85599 73 3 0x1100090 kqread syslogd 85599 175880 1 0 3 0x100082 netio syslogd 75072 60069 1 0 3 0x100080 kqread resolvd 27721 473456 67357 77 3 0x100092 kqread dhcpleased 54493 196855 67357 77 3 0x100092 kqread dhcpleased 67357 285504 1 0 3 0x80 kqread dhcpleased 32931 57130 0 0 3 0x14200 bored smr 22853 385908 0 0 2 0x14200 zerothread 44717 47650 0 0 3 0x14200 aiodoned aiodoned 34848 461502 0 0 3 0x14200 syncer update 15891 253966 0 0 3 0x14200 cleaner cleaner 61880 522422 0 0 3 0x14200 reaper reaper 16804 170816 0 0 3 0x14200 pgdaemon pagedaemon 52871 490595 0 0 3 0x14200 bored viomb 43487 58535 0 0 3 0x40014200 acpi0 acpi0 5244 355502 0 0 3 0x14200 bored softnet 22108 366258 0 0 3 0x14200 bored softnet 12827 109294 0 0 3 0x14200 bored softnet 10682 23152 0 0 3 0x14200 bored softnet 55854 67891 0 0 3 0x14200 bored systqmp 98984 181783 0 0 3 0x14200 bored systq 22531 379356 0 0 3 0x40014200 bored softclock 19286 379081 0 0 3 0x40014200 idle0 1 161146 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 10214 6491K 7111K 78643K 18825 0 pcb 13 20K 22K 78643K 810 0 rtable 142 13K 15K 78643K 2204 0 ifaddr 56 18K 21K 78643K 573 0 sysctl 2 0K 0K 78643K 6 0 counters 25 17K 17K 78643K 142 0 ioctlops 0 0K 4K 78643K 496 0 iov 0 0K 28K 78643K 672 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1471 92K 92K 78643K 6814 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 33 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 794 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 77K 78643K 5548 0 sigio 0 0K 0K 78643K 355 0 proc 60 59K 75K 78643K 1990 0 subproc 104 6K 6K 78643K 715 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 805 0 in_multi 52 3K 6K 78643K 729 0 ether_multi 1 0K 0K 78643K 10 0 mrt 2 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 211 943K 943K 78643K 211 0 exec 0 0K 1K 78643K 1595 0 pfkey data 0 0K 0K 78643K 42 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 91K 97K 78643K 35964 0 UVM aobj 131 4K 4K 78643K 136 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 107 0 NDP 9 0K 2K 78643K 221 0 temp 117 5770K 6794K 78643K 86114 0 kqueue 12 18K 28K 78643K 588 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 120 731 0 728 12 11 1 5 0 8 0 rtentry 112 697 0 639 4 1 3 4 0 8 1 unpcb 144 15880 0 15863 82 76 6 11 0 8 5 syncache 296 39 0 39 8 8 0 1 0 8 0 tcpqe 32 115 0 115 5 5 0 1 0 8 0 tcpcb 776 1723 0 1719 72 66 6 14 0 8 5 arp 88 115 0 105 1 0 1 1 0 8 0 ipq 40 6 0 6 3 3 0 1 0 8 0 ipqe 40 15 0 15 3 3 0 1 0 8 0 inpcb 336 4998 0 4991 92 85 7 12 0 8 6 nd6 48 174 0 164 1 0 1 1 0 8 0 pkpcb 40 110 0 110 3 3 0 1 0 8 0 kcovpl 48 55 0 47 1 0 1 1 0 8 0 mppekey 1024 7 0 7 2 2 0 1 0 8 0 ppxss 1160 29 0 29 10 10 0 1 0 8 0 pppxif 1360 25 0 25 9 9 0 1 0 8 0 pfanchor 1280 371 0 0 31 0 31 31 0 8 0 art_heap8 4096 2 0 1 2 1 1 2 0 8 0 art_heap4 256 2989 0 2724 43 22 21 29 0 8 3 art_table 32 2991 0 2725 7 4 3 4 0 8 0 art_node 16 694 0 644 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 4 1 0 1 1 0 8 0 semapl 112 789 0 779 1 0 1 1 0 8 0 shmpl 112 133 0 5 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 8174 0 6714 93 1 92 92 0 8 0 ffsino 240 8174 0 6714 86 0 86 86 0 8 0 nchpl 144 15543 0 13899 63 1 62 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 63298 0 63298 3 2 1 3 0 8 1 vmpool 664 30 0 30 6 6 0 1 0 8 0 kstatmem 264 202 0 184 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 43223 0 43223 19 16 3 8 0 8 3 plimitpl 152 1018 0 1003 1 0 1 1 0 8 0 sigapl 424 5763 0 5696 8 0 8 8 0 8 0 futexpl 64 57955 0 57949 1 0 1 1 0 8 0 knotepl 120 109927 0 109847 30 23 7 8 0 8 2 kqueuepl 184 1592 0 1584 27 23 4 4 0 8 3 pipepl 288 1662 0 1634 30 23 7 7 0 8 4 fdescpl 432 5725 0 5697 4 0 4 4 0 8 0 filepl 120 54507 0 54261 94 79 15 22 0 8 6 lockfpl 104 1667 0 1664 3 2 1 2 0 8 0 lockfspl 48 511 0 508 1 0 1 1 0 8 0 sessionpl 144 70 0 54 1 0 1 1 0 8 0 pgrppl 48 235 0 219 1 0 1 1 0 8 0 ucredpl 104 4916 0 4904 1 0 1 1 0 8 0 zombiepl 144 5697 0 5696 2 1 1 1 0 8 0 processpl 1008 5763 0 5696 11 2 9 9 0 8 0 procpl 696 13504 0 13416 15 6 9 10 0 8 0 sosppl 168 68 0 68 9 8 1 1 0 8 1 sockpl 456 21725 0 21698 602 589 13 50 0 8 9 mcl64k 65536 221 0 221 12 11 1 1 0 8 1 mcl16k 16384 135 0 135 13 13 0 1 0 8 0 mcl12k 12288 180 0 180 12 11 1 1 0 8 1 mcl9k 9216 72 0 72 15 14 1 1 0 8 1 mcl8k 8192 319 0 319 9 8 1 1 0 8 1 mcl4k 4096 716 0 716 8 7 1 1 0 8 1 mcl2k2 2112 34 0 34 13 13 0 1 0 8 0 mcl2k 2048 86147 0 86070 43 32 11 30 0 8 0 mtagpl 96 748 0 618 12 7 5 8 0 8 0 mbufpl 256 189425 0 189094 100 74 26 70 0 8 0 bufpl 288 12436 0 6042 457 0 457 457 0 8 0 anonpl 24 1131723 0 1114622 211 96 115 136 0 188 1 amapchunkpl 152 100038 0 99275 58 27 31 40 0 158 1 amappl16 200 12170 0 11590 102 69 33 43 0 8 2 amappl15 192 6 0 5 1 0 1 1 0 8 0 amappl14 184 325 0 313 2 1 1 2 0 8 0 amappl13 176 10 0 8 1 0 1 1 0 8 0 amappl12 168 980 0 978 1 0 1 1 0 8 0 amappl11 160 50 0 39 1 0 1 1 0 8 0 amappl10 152 105 0 95 1 0 1 1 0 8 0 amappl9 144 995 0 994 2 1 1 1 0 8 0 amappl8 136 378 0 301 3 0 3 3 0 8 0 amappl7 128 245 0 221 2 0 2 2 0 8 0 amappl6 120 394 0 380 2 1 1 2 0 8 0 amappl5 112 370 0 364 1 0 1 1 0 8 0 amappl4 104 990 0 959 2 1 1 2 0 8 0 amappl3 96 15343 0 15282 2 0 2 2 0 8 0 amappl2 88 6601 0 6525 3 1 2 3 0 8 0 amappl1 80 128984 0 128217 34 18 16 26 0 8 0 amappl 88 34913 0 34714 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 72 135 0 5 3 0 3 3 0 8 0 uaddrrnd 24 5755 0 5726 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5755 0 5726 1 0 1 1 0 8 0 vmmpekpl 168 47603 0 47551 3 0 3 3 0 8 0 vmmpepl 168 547413 0 544493 270 134 136 158 0 357 6 vmsppl 344 5754 0 5726 3 0 3 3 0 8 0 rwobjpl 24 142509 0 134705 52 3 49 49 0 8 0 pdppl 4096 11516 0 11452 503 439 64 70 0 8 0 pvpl 32 2294937 0 2272142 481 285 196 360 0 265 3 pmappl 216 5754 0 5726 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1511 0 731 24 0 24 24 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x4e ffs_write(ffff80002ccc7b80) at ffs_write+0x924 VOP_WRITE(fffffd806632f1f8,ffff80002ccc7c18,23,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806632f1f8,ffff80002ccc7d08,40,0,1,352af5314b6644e1,0,ffff8000fffed078,fffffd806632f1f8) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324 acct_process(ffff8000fffed078) at acct_process+0x62c sys/kern/kern_acct.c:243 exit1(ffff8000fffed078,0,0,1) at exit1+0x387 sys/kern/kern_exit.c:209 sys_exit(ffff8000fffed078,ffff80002ccc7e80,ffff80002ccc7ed0) at sys_exit+0x16 sys/kern/kern_exit.c:89 syscall(ffff80002ccc7f50) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbbe10, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x4e ffs_write(ffff80002ccc7b80) at ffs_write+0x924 VOP_WRITE(fffffd806632f1f8,ffff80002ccc7c18,23,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd806632f1f8,ffff80002ccc7d08,40,0,1,352af5314b6644e1,0,ffff8000fffed078,fffffd806632f1f8) at vn_rdwr+0xe9 sys/kern/vfs_vnops.c:324 acct_process(ffff8000fffed078) at acct_process+0x62c sys/kern/kern_acct.c:243 exit1(ffff8000fffed078,0,0,1) at exit1+0x387 sys/kern/kern_exit.c:209 sys_exit(ffff8000fffed078,ffff80002ccc7e80,ffff80002ccc7ed0) at sys_exit+0x16 sys/kern/kern_exit.c:89 syscall(ffff80002ccc7f50) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbbe10, count: -9