uvm_fault(0xffffffff83a3abf0, 0xffff8000266221c0, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND memset() at memset+0x52 ffs_write(ffff80003c8e1460) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8069ad3398,ffff80003c8e14f8,23,fffffd8007ffd958) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8069ad3398,ffff80003c8e1630,40,0,1,987f09121d6895bf,0,1008,80) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:330 acct_process(ffff800035ccb248) at acct_process+0x7a2 sys/kern/kern_acct.c:246 exit1(ffff800035ccb248,b,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff800035ccb248,ffff80003c8e1860,ffff80003c8e17b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c8e1860) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c8e1860) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c670b2dd420, 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(0xffffffff83a3abf0, 0xffff8000266221c0, 0, 2) -> d ddb> trace memset() at memset+0x52 ffs_write(ffff80003c8e1460) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8069ad3398,ffff80003c8e14f8,23,fffffd8007ffd958) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8069ad3398,ffff80003c8e1630,40,0,1,987f09121d6895bf,0,1008,80) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:330 acct_process(ffff800035ccb248) at acct_process+0x7a2 sys/kern/kern_acct.c:246 exit1(ffff800035ccb248,b,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff800035ccb248,ffff80003c8e1860,ffff80003c8e17b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c8e1860) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c8e1860) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c670b2dd420, count: -9 ddb> show registers rdi 0xffff8000266221c0 rsi 0 rbp 0xffff80003c8e1380 rbx 0x81c0 __ALIGN_SIZE+0x71c0 rdx 0 rcx 0xc8 rax 0 r8 0x640 r9 0xffff80003c8e12e0 r10 0x932e28a745d6553e r11 0xffff8000266221c0 r12 0x1c0 r13 0x800 r14 0xfffffd8069ad3398 r15 0x1 rip 0xffffffff818641e2 memset+0x52 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80003c8e1178 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb> show proc PROC (syz-executor) tid=362316 pid=994 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800035ccb248 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002f0b02c0,0xffff80002f0b0568 process=0xffff8000ffff8918 user=0xffff80003c8dc000, vmspace=0xfffffd806caa4e70 estcpu=29, cpticks=6, pctcpu=0.5, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 4603 390314 16438 0 2 0 syz-executor 13345 19322 61226 0 2 0 syz-executor 13345 76194 61226 0 2 0x4000000 syz-executor 95264 93988 4799 0 3 0x80 nanoslp syz-executor 95264 422251 4799 0 3 0x4000080 sbwait syz-executor 95264 479565 4799 0 3 0x4000080 fsleep syz-executor 28449 78501 53146 0 2 0xc80 syz-executor 28449 112552 53146 0 3 0x4000080 kqread syz-executor 28449 480907 53146 0 3 0x4000080 fsleep syz-executor 74200 356782 51293 0 3 0x80 nanoslp syz-executor 74200 115046 51293 0 3 0x4000080 fsleep syz-executor 74200 401402 51293 0 3 0x4000080 pipewr syz-executor 14360 422291 1 0 3 0x100083 ttyin getty 71015 221271 0 0 3 0x14200 acct acct 16438 138803 66310 0 2 0xc82 syz-executor 4799 11247 66310 0 3 0x82 nanoslp syz-executor 65320 253705 66310 0 3 0x82 nanoslp syz-executor 53146 393406 66310 0 3 0x82 nanoslp syz-executor 10357 284233 66310 0 3 0x82 nanoslp syz-executor 40993 473714 66310 0 2 0x2 syz-executor 61226 55298 66310 0 3 0x82 nanoslp syz-executor 51293 133526 66310 0 2 0xc82 syz-executor 66310 370774 1 0 3 0x82 kqread syz-executor 80326 335559 1 73 3 0x1100090 kqread syslogd 42723 126583 0 0 3 0x14200 bored smr 93980 285484 0 0 2 0x14200 zerothread 9568 190433 0 0 3 0x14200 aiodoned aiodoned 97252 180593 0 0 3 0x14200 syncer update 84044 339783 0 0 3 0x14200 cleaner cleaner 11497 508668 0 0 3 0x14200 reaper reaper 73004 466142 0 0 3 0x14200 pgdaemon pagedaemon 18120 16952 0 0 3 0x14200 bored viomb 3952 115954 0 0 3 0x40014200 acpi0 acpi0 62711 222491 0 0 3 0x14200 bored softnet0 2891 322327 0 0 3 0x14200 bored systqmp 23809 228269 0 0 3 0x14200 bored systq 49816 439373 0 0 3 0x40014200 tmoslp softclock 97318 405704 0 0 3 0x40014200 idle0 1 228829 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 11061 12291K 12500K 166960K 13031 0 pcb 18 18K 23K 166960K 418 0 rtable 225 10K 10K 166960K 459 0 pf 33 13K 94K 166960K 100 0 ifaddr 36 6K 7K 166960K 64 0 ifgroup 46 2K 2K 166960K 90 0 sysctl 4 1K 9K 166960K 14 0 counters 32 17K 18K 166960K 50 0 ioctlops 0 0K 4K 166960K 241 0 iov 1 0K 16K 166960K 28 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1357 85K 86K 166960K 1870 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 726 0 sigio 0 0K 0K 166960K 5 0 proc 20 25K 100K 166960K 578 0 subproc 72 4K 4K 166960K 73 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 59 0 in_multi 83 6K 7K 166960K 140 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 19 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 223 996K 996K 166960K 223 0 exec 0 0K 1K 166960K 498 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 144 83K 159K 166960K 7903 0 UVM aobj 22 2K 2K 166960K 24 0 pinsyscall 21 42K 94K 166960K 1831 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 18 0 NDP 10 0K 2K 166960K 42 0 temp 77 9116K 9180K 166960K 31047 0 kqueue 5 8K 29K 166960K 141 0 SYN cache 2 16K 24K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 66 0 65 1 0 1 1 0 8 0 rtentry 136 133 0 39 4 0 4 4 0 8 0 unpcb 144 470 0 464 4 0 4 4 0 8 3 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 249 0 248 7 0 7 7 0 8 6 arp 96 20 0 5 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 3 0 0 1 0 1 1 0 8 0 inpcb 328 963 0 960 15 6 9 12 0 8 8 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 112 29 0 10 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 11 0 11 1 0 1 1 0 8 1 pppxif 1416 3 0 3 1 0 1 1 0 8 1 pfstscr 40 10 0 6 1 0 1 1 0 8 0 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 4 0 0 1 0 1 1 0 8 0 pffrent 40 8 0 3 1 0 1 1 0 8 0 pfrktable 1344 3 0 1 1 0 1 1 0 8 0 pfsrclim 320 35 0 35 1 0 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfqueue 320 3 0 3 1 0 1 1 0 8 1 pfstitem 24 7 0 2 1 0 1 1 0 8 0 pfstkey 128 11 0 6 1 0 1 1 0 8 0 pfstate 384 6 0 3 1 0 1 1 0 8 0 pfrule 1360 7 0 6 1 0 1 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 580 0 180 31 0 31 31 0 8 4 art_table 40 583 0 180 5 0 5 5 0 8 0 art_node 32 133 0 47 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 72 25 0 15 1 0 1 1 0 8 0 shmpl 112 21 0 2 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 2626 0 1175 92 0 92 92 0 8 0 ffsino 256 2626 0 1175 92 0 92 92 0 8 0 nchpl 144 3664 0 1969 64 0 64 64 0 8 0 vnodes 216 3040 0 0 169 0 169 169 0 8 0 namei 1024 12290 0 12290 2 0 2 2 0 8 2 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 47 0 26 2 0 2 2 0 8 0 scsiplug 72 7 0 7 1 0 1 1 0 8 1 scxspl 216 14409 0 14409 8 0 8 8 1 8 8 plimitpl 152 117 0 103 1 0 1 1 0 8 0 sigapl 424 1014 0 980 6 0 6 6 0 8 1 knotepl 120 27856 0 27830 28 18 10 16 0 8 8 kqueuepl 184 188 0 184 1 0 1 1 0 8 0 pipepl 304 185 0 156 3 0 3 3 0 8 0 fdescpl 448 1000 0 981 5 0 5 5 0 8 1 filepl 120 6084 0 5900 11 0 11 11 0 8 4 lockfpl 104 263 0 263 1 0 1 1 0 8 1 lockfspl 48 84 0 84 1 0 1 1 0 8 1 sessionpl 144 47 0 43 1 0 1 1 0 8 0 pgrppl 48 57 0 45 1 0 1 1 0 8 0 ucredpl 104 1042 0 1037 1 0 1 1 0 8 0 zombiepl 144 982 0 980 1 0 1 1 0 8 0 processpl 1152 1014 0 980 4 0 4 4 0 8 0 procpl 664 1878 0 1837 6 0 6 6 0 8 1 sosppl 176 5 0 5 1 0 1 1 0 8 1 sockpl 552 1524 0 1514 13 3 10 12 0 8 8 mcl64k 65536 74 0 74 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl12k 12288 3 0 3 1 0 1 1 0 8 1 mcl9k128 9344 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 12 0 12 1 0 1 1 0 8 1 mcl4k 4096 3317 0 3263 14 0 14 14 0 8 6 mcl2k 2048 847 0 842 2 0 2 2 0 8 1 mtagpl 96 5 0 5 1 0 1 1 0 8 1 mbufpl 256 10214 0 10016 17 0 17 17 0 8 3 bufpl 280 6935 0 719 445 0 445 445 0 8 0 anonpl 24 167005 0 161015 70 0 70 70 0 186 33 amapchunkpl 152 27149 0 26767 39 0 39 39 0 158 22 amappl16 200 3160 0 2892 31 16 15 27 0 8 0 amappl15 192 37 0 37 1 0 1 1 0 8 1 amappl14 184 413 0 413 1 0 1 1 0 8 1 amappl13 176 122 0 120 1 0 1 1 0 8 0 amappl12 168 1244 0 1226 2 0 2 2 0 8 0 amappl11 160 40 0 40 1 0 1 1 0 8 1 amappl10 152 58 0 56 1 0 1 1 0 8 0 amappl9 144 267 0 267 1 0 1 1 0 8 1 amappl8 136 165 0 165 1 0 1 1 0 8 1 amappl7 128 144 0 139 1 0 1 1 0 8 0 amappl6 120 219 0 218 1 0 1 1 0 8 0 amappl5 112 91 0 89 1 0 1 1 0 8 0 amappl4 104 274 0 266 1 0 1 1 0 8 0 amappl3 96 5237 0 5159 4 0 4 4 0 8 1 amappl2 88 534 0 520 2 0 2 2 0 8 0 amappl1 80 12576 0 12423 13 0 13 13 0 8 5 amappl 88 7064 0 6939 5 0 5 5 0 92 1 uvmvnodes 80 112 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 23 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1000 0 980 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1000 0 980 1 0 1 1 0 8 0 vmmpekpl 168 9318 0 9284 2 0 2 2 0 8 0 vmmpepl 168 70242 0 69058 102 0 102 102 0 357 46 vmsppl 368 999 0 980 4 0 4 4 0 8 1 rwobjpl 40 21272 0 20523 15 0 15 15 0 8 2 pdppl 4096 2006 0 1960 94 46 48 78 0 8 2 pvpl 32 458234 0 449435 155 0 155 155 0 265 78 pmappl 216 999 0 980 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 374 0 46 10 0 10 10 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x52 ffs_write(ffff80003c8e1460) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8069ad3398,ffff80003c8e14f8,23,fffffd8007ffd958) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8069ad3398,ffff80003c8e1630,40,0,1,987f09121d6895bf,0,1008,80) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:330 acct_process(ffff800035ccb248) at acct_process+0x7a2 sys/kern/kern_acct.c:246 exit1(ffff800035ccb248,b,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff800035ccb248,ffff80003c8e1860,ffff80003c8e17b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c8e1860) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c8e1860) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c670b2dd420, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x52 ffs_write(ffff80003c8e1460) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8069ad3398,ffff80003c8e14f8,23,fffffd8007ffd958) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8069ad3398,ffff80003c8e1630,40,0,1,987f09121d6895bf,0,1008,80) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:330 acct_process(ffff800035ccb248) at acct_process+0x7a2 sys/kern/kern_acct.c:246 exit1(ffff800035ccb248,b,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff800035ccb248,ffff80003c8e1860,ffff80003c8e17b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c8e1860) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c8e1860) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c670b2dd420, count: -9 ddb>