uvm_fault(0xffffffff83676930, 0xffff800025453000, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *274688 79395 60929 0x10 0x4000000 0K syz-executor 54393 94978 0 0x14000 0x200 1 reaper memset() at memset+0x52 ffs2_balloc(fffffd806e0c69e8,2cfea,3016,fffffd807f7d3208,1,ffff80003bd866f8) at ffs2_balloc+0x547 sys/ufs/ffs/ffs_balloc.c:516 ffs_write(ffff80003bd86780) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805c5dcb58,ffff80003bd869a0,1,fffffd807f7d3208) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_write(fffffd806ba0bda8,ffff80003bd869a0,0) at vn_write+0x1d4 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c5cef70,4,ffff80003bd869a0,0,ffff80003bd86a60) at dofilewritev+0x23c sys/kern/sys_generic.c:380 sys_writev(ffff80003c5cef70,ffff80003bd86b10,ffff80003bd86a60) at sys_writev+0xd8 sys/kern/sys_generic.c:327 syscall(ffff80003bd86b10) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bd86b10) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4d8ebd55a40, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xffffffff83676930, 0xffff800025453000, 0, 2) -> d ddb{0}> trace memset() at memset+0x52 ffs2_balloc(fffffd806e0c69e8,2cfea,3016,fffffd807f7d3208,1,ffff80003bd866f8) at ffs2_balloc+0x547 sys/ufs/ffs/ffs_balloc.c:516 ffs_write(ffff80003bd86780) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805c5dcb58,ffff80003bd869a0,1,fffffd807f7d3208) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_write(fffffd806ba0bda8,ffff80003bd869a0,0) at vn_write+0x1d4 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c5cef70,4,ffff80003bd869a0,0,ffff80003bd86a60) at dofilewritev+0x23c sys/kern/sys_generic.c:380 sys_writev(ffff80003c5cef70,ffff80003bd86b10,ffff80003bd86a60) at sys_writev+0xd8 sys/kern/sys_generic.c:327 syscall(ffff80003bd86b10) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bd86b10) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4d8ebd55a40, count: -9 ddb{0}> show registers rdi 0xffff800025453000 rsi 0 rbp 0xffff80003bd86510 rbx 0x4000 __ALIGN_SIZE+0x3000 rdx 0 rcx 0x600 rax 0 r8 0x3000 __ALIGN_SIZE+0x2000 r9 0xfffffd807f7d3208 r10 0x863f197151efac78 r11 0xffff800025453000 r12 0x7cf0 __ALIGN_SIZE+0x6cf0 r13 0xffff80003bd866f8 r14 0xfffffd805cd0ca10 r15 0x4000 __ALIGN_SIZE+0x3000 rip 0xffffffff82fb7152 memset+0x52 cs 0x8 rflags 0x10206 __ALIGN_SIZE+0xf206 rsp 0xffff80003bd86438 ss 0x10 memset+0x52: repe stosq %es:(%rdi) ddb{0}> show proc PROC (syz-executor) tid=274688 pid=79395 tcnt=2 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c5ce2c8,0xffffffff8358d158 process=0xffff80003c641480 user=0xffff80003bd81000, vmspace=0xfffffd806bfd4ac8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79395 510779 45608 60929 2 0x10 syz-executor *79395 274688 45608 60929 7 0x4000010 syz-executor 40379 320704 95222 0 2 0x400000 syz-executor 40379 142129 95222 0 3 0x4400080 fsleep syz-executor 40379 221906 95222 0 3 0x4400080 fsleep syz-executor 25120 161291 1 0 3 0x100083 ttyin getty 40421 488677 0 0 3 0x14200 bored sosplice 54548 301919 0 0 3 0x14200 acct acct 95204 515379 0 0 3 0x14280 nfsidl nfsio 68021 363839 0 0 3 0x14280 nfsidl nfsio 17900 417461 0 0 3 0x14280 nfsidl nfsio 38460 336550 0 0 3 0x14280 nfsidl nfsio 30787 300086 0 0 3 0x14280 nfsidl nfsio 9063 10242 0 0 3 0x14280 nfsidl nfsio 85927 54849 0 0 3 0x14280 nfsidl nfsio 66617 349825 0 0 3 0x14280 nfsidl nfsio 30588 125141 0 0 3 0x14280 nfsidl nfsio 78319 305423 0 0 3 0x14280 nfsidl nfsio 9737 106369 0 0 3 0x14280 nfsidl nfsio 2398 435725 0 0 3 0x14280 nfsidl nfsio 82123 464586 0 0 3 0x14280 nfsidl nfsio 22740 362033 0 0 3 0x14280 nfsidl nfsio 11691 165866 0 0 3 0x14280 nfsidl nfsio 35480 197085 0 0 3 0x14280 nfsidl nfsio 48486 217798 0 0 3 0x14280 nfsidl nfsio 98558 40963 0 0 3 0x14280 nfsidl nfsio 78919 226637 0 0 3 0x14280 nfsidl nfsio 47540 503010 0 0 3 0x14280 nfsidl nfsio 40883 457519 33231 0 3 0x100082 sbwait arp 33231 499936 52992 0 3 0x10008a sigsusp sh 6713 406266 72276 0 3 0x100082 sbwait ndp 72276 334007 71122 0 3 0x10008a sigsusp sh 18044 2793 3061 0 3 0x82 wait syz-executor 95222 372391 3061 0 3 0x82 nanoslp syz-executor 81050 389444 3061 0 2 0x482 syz-executor 52992 298957 3061 0 3 0x82 wait syz-executor 45608 433159 3061 0 2 0x482 syz-executor 71122 482607 3061 0 3 0x82 wait syz-executor 3061 201157 68731 0 3 0x82 wait syz-executor 68731 489115 90390 0 3 0x10008a sigsusp ksh 90390 180779 30073 0 3 0x98 kqread sshd-session 30073 506059 59217 0 3 0x92 kqread sshd-session 59217 13437 1 0 3 0x88 kqread sshd 20087 399360 44606 74 3 0x1100092 bpf pflogd 44606 146120 1 0 3 0x80 sbwait pflogd 70385 490299 84789 73 3 0x1100090 kqread syslogd 84789 73111 1 0 3 0x100082 sbwait syslogd 73702 392567 1 0 3 0x100080 kqread resolvd 61485 155710 30940 77 3 0x100092 kqread dhcpleased 73877 140082 30940 77 3 0x100092 kqread dhcpleased 30940 503306 1 0 3 0x80 kqread dhcpleased 76487 63207 0 0 3 0x14200 pause smr 42285 485385 0 0 2 0x14200 zerothread 24685 100592 0 0 3 0x14200 aiodoned aiodoned 26322 235032 0 0 3 0x14200 syncer update 25488 109904 0 0 3 0x14200 cleaner cleaner 94978 54393 0 0 7 0x14200 reaper 55823 107238 0 0 3 0x14200 pgdaemon pagedaemon 80040 395911 0 0 3 0x14200 bored viomb 2841 32510 0 0 3 0x40014200 acpi0 acpi0 96062 10927 0 0 3 0x40014200 idle1 13142 54717 0 0 3 0x14200 bored softnet3 66579 175130 0 0 3 0x14200 bored softnet2 61491 248591 0 0 3 0x14200 bored softnet1 26677 276518 0 0 3 0x14200 bored softnet0 79238 207139 0 0 3 0x14200 bored systqmp 76122 348234 0 0 3 0x14200 bored systq 91748 231312 0 0 3 0x14200 tmoslp softclockmp 63625 282373 0 0 2 0x40014200 softclock 71713 426817 0 0 3 0x40014200 idle0 1 418716 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 79395 (syz-executor) thread 0xffff80003c5cef70 (274688) exclusive rrwlock inode r = 0 (0xfffffd806e0c6a88) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_do_enter_write+0x3ea sys/kern/kern_rwlock.c:316 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:616 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x190 sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_writev+0xd8 sys/kern/sys_generic.c:327 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff835eaf78) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 vn_write+0x4e sys/kern/vfs_vnops.c:393 #2 dofilewritev+0x23c sys/kern/sys_generic.c:380 #3 sys_writev+0xd8 sys/kern/sys_generic.c:327 #4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 Process 94978 (reaper) thread 0xffff8000ffffc518 (54393) exclusive kernel: protection fault trap, code=0 Faulted in DDB; continuing... ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 11030K 11477K 166960K 12874 0 pcb 17 12K 12K 166960K 161 0 rtable 166 5K 7K 166960K 428 0 pf 35 17K 19K 166960K 71 0 ifaddr 34 5K 7K 166960K 58 0 ifgroup 54 2K 2K 166960K 83 0 sysctl 4 1K 3K 166960K 7 0 counters 62 36K 36K 166960K 80 0 ioctlops 0 0K 4K 166960K 1532 0 iov 1 0K 28K 166960K 55 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1362 86K 86K 166960K 2109 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 11 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 41 0 dirhash 12 2K 3K 166960K 36 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 93K 166960K 995 0 sigio 0 0K 0K 166960K 17 0 proc 77 103K 128K 166960K 635 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 91 0 in_multi 65 5K 7K 166960K 143 0 ether_multi 1 0K 0K 166960K 9 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 485 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 212 73K 77K 166960K 11001 0 UVM aobj 17 2K 2K 166960K 21 0 pinsyscall 44 88K 104K 166960K 2111 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 48 0 NDP 11 0K 2K 166960K 37 0 temp 68 6897K 6972K 166960K 47171 0 kqueue 14 22K 27K 166960K 161 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 91 0 86 1 0 1 1 0 8 0 rtentry 112 127 0 54 4 0 4 4 0 8 0 unpcb 144 902 0 885 6 4 2 6 0 8 1 syncache 336 5 0 5 2 2 0 1 0 8 0 tcpcb 808 236 0 232 6 1 5 5 0 8 4 arp 120 20 0 4 1 0 1 1 0 8 0 inpcb 376 832 0 824 11 6 5 8 0 8 4 nd6 136 29 0 14 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 6 0 6 2 1 1 1 0 8 1 pffrag 232 9 0 2 1 0 1 1 0 482 0 pffrnode 88 9 0 2 1 0 1 1 0 8 0 pffrent 40 12 0 5 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 73 0 20 1 0 1 1 0 8 0 pfstkey 128 75 0 22 2 0 2 2 0 8 0 pfstate 376 74 0 21 6 0 6 6 0 8 0 pfrule 1344 24 0 17 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 597 0 325 29 0 29 29 0 8 7 art_table 32 600 0 325 4 0 4 4 0 8 0 art_node 16 125 0 59 1 0 1 1 0 8 0 sysvmsgpl 40 44 0 4 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 39 0 29 1 0 1 1 0 8 0 shmpl 112 18 0 4 1 0 1 1 0 8 0 dirhash 1024 33 0 16 3 0 3 3 0 8 0 dino2pl 256 3239 0 1735 95 0 95 95 0 8 0 ffsino 280 3239 0 1735 109 0 109 109 0 8 0 nchpl 144 4729 0 3038 63 0 63 63 0 8 0 uvmvnodes 80 3752 0 0 77 0 77 77 0 8 0 vnodes 216 3752 0 0 209 0 209 209 0 8 0 namei 1024 15480 0 15480 2 1 1 2 0 8 1 percpumem 16 54 0 9 1 0 1 1 0 8 0 kstatmem 264 38 0 16 2 0 2 2 0 8 0 scsiplug 72 6 0 6 2 1 1 1 0 8 1 scxspl 216 18209 0 18209 12 9 3 8 1 8 3 plimitpl 152 162 0 145 1 0 1 1 0 8 0 sigapl 424 1329 0 1257 10 1 9 9 0 8 0 futexpl 64 13361 0 13359 1 0 1 1 0 8 0 knotepl 120 575 0 0 17 0 17 17 0 8 0 kqueuepl 216 304 0 294 5 4 1 5 0 8 0 pipepl 328 250 0 223 5 2 3 5 0 8 0 fdescpl 504 1289 0 1258 5 0 5 5 0 8 0 filepl 152 7708 0 7495 14 2 12 14 0 8 2 lockfpl 104 373 0 371 1 0 1 1 0 8 0 lockfspl 48 150 0 148 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 42 0 25 1 0 1 1 0 8 0 ucredpl 104 1328 0 1313 1 0 1 1 0 8 0 zombiepl 144 1261 0 1257 1 0 1 1 0 8 0 processpl 1168 1329 0 1257 6 0 6 6 0 8 0 procpl 648 2846 0 2771 9 1 8 8 0 8 0 srpgc 96 3 0 3 1 1 0 1 0 8 0 sosppl 168 3 0 3 1 0 1 1 0 8 1 sockpl 688 1846 0 1816 18 11 7 16 0 8 3 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 59 0 0 7 0 7 7 0 8 0 mtagpl 96 124 0 0 4 0 4 4 0 8 0 mbufpl 256 448 0 0 27 0 27 27 0 8 0 bufpl 280 8385 0 2219 441 0 441 441 0 8 0 anonpl 24 181152 0 177667 60 13 47 55 0 185 17 amapchunkpl 152 35029 0 34511 23 2 21 23 0 158 0 amappl16 200 3695 0 3664 34 23 11 18 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 188 0 173 1 0 1 1 0 8 0 amappl13 176 2 0 2 1 1 0 1 0 8 0 amappl12 168 1947 0 1914 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 23 0 23 1 1 0 1 0 8 0 amappl9 144 246 0 246 1 1 0 1 0 8 0 amappl8 136 24 0 21 1 0 1 1 0 8 0 amappl7 128 110 0 96 1 0 1 1 0 8 0 amappl6 120 179 0 173 1 0 1 1 0 8 0 amappl5 112 125 0 115 1 0 1 1 0 8 0 amappl4 104 325 0 302 1 0 1 1 0 8 0 amappl3 96 7176 0 7076 4 0 4 4 0 8 0 amappl2 88 659 0 590 2 0 2 2 0 8 0 amappl1 80 10472 0 9850 14 0 14 14 0 8 0 amappl 88 10554 0 10404 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 0 8 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 128 254 0 254 2 2 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 20 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1289 0 1258 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1289 0 1258 1 0 1 1 0 8 0 vmmpekpl 168 12109 0 12066 4 1 3 3 0 8 0 vmmpepl 168 83121 0 81295 102 4 98 100 0 357 10 vmsppl 456 1288 0 1258 5 0 5 5 0 8 0 rwobjpl 64 27095 0 22320 78 0 78 78 0 8 0 pdppl 4096 2585 0 2516 101 26 75 85 0 8 6 pvpl 32 15941 0 0 130 1 129 129 0 265 0 pmappl 248 1288 0 1258 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 310 0 34 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace memset() at memset+0x52 ffs2_balloc(fffffd806e0c69e8,2cfea,3016,fffffd807f7d3208,1,ffff80003bd866f8) at ffs2_balloc+0x547 sys/ufs/ffs/ffs_balloc.c:516 ffs_write(ffff80003bd86780) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345 VOP_WRITE(fffffd805c5dcb58,ffff80003bd869a0,1,fffffd807f7d3208) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_write(fffffd806ba0bda8,ffff80003bd869a0,0) at vn_write+0x1d4 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80003c5cef70,4,ffff80003bd869a0,0,ffff80003bd86a60) at dofilewritev+0x23c sys/kern/sys_generic.c:380 sys_writev(ffff80003c5cef70,ffff80003bd86b10,ffff80003bd86a60) at sys_writev+0xd8 sys/kern/sys_generic.c:327 syscall(ffff80003bd86b10) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bd86b10) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4d8ebd55a40, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029b5bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff835ead70) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835ead70) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff8000ffffc518) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff800029b5bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff835ead70) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff835ead70) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff8000ffffc518) at reaper+0x24b sys/kern/kern_exit.c:478 end trace frame: 0x0, count: -5