uvm_fault(0xffffffff82847ae8, 0xffff800020bff402, 0, 2) -> d kernel: page fault trap, code=0 Stopped at memset+0x45: repe stosb %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND *465555 10660 0 0x2 0x1 0 syz-executor.0 memset() at memset+0x45 ffs_write(ffff800021705710) at ffs_write+0x932 sys/ufs/ffs/ffs_vnops.c:403 VOP_WRITE(fffffd807e92a2b0,ffff8000217057c8,3,fffffd807f7d8720) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:272 ktrwriteraw(ffff800021684a80,fffffd807e92a2b0,fffffd807f7d8720,ffff800021705890,ffff800021705870) at ktrwriteraw+0x145 sys/kern/kern_ktrace.c:662 ktrstruct(ffff800021684a80,ffffffff82457c0a,ffff800021705940,80) at ktrstruct+0x163 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021684a80,ffffffff82457c0a,ffff800021705940,80) at ktrstruct+0x163 sys/kern/kern_ktrace.c:311 sys_fstat(ffff800021684a80,ffff800021705a20,ffff800021705a80) at sys_fstat+0x1cb sys/kern/kern_descrip.c:818 syscall(ffff800021705af0) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc55c0, count: 7 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(0xffffffff82847ae8, 0xffff800020bff402, 0, 2) -> d ddb> trace memset() at memset+0x45 ffs_write(ffff800021705710) at ffs_write+0x932 sys/ufs/ffs/ffs_vnops.c:403 VOP_WRITE(fffffd807e92a2b0,ffff8000217057c8,3,fffffd807f7d8720) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:272 ktrwriteraw(ffff800021684a80,fffffd807e92a2b0,fffffd807f7d8720,ffff800021705890,ffff800021705870) at ktrwriteraw+0x145 sys/kern/kern_ktrace.c:662 ktrstruct(ffff800021684a80,ffffffff82457c0a,ffff800021705940,80) at ktrstruct+0x163 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021684a80,ffffffff82457c0a,ffff800021705940,80) at ktrstruct+0x163 sys/kern/kern_ktrace.c:311 sys_fstat(ffff800021684a80,ffff800021705a20,ffff800021705a80) at sys_fstat+0x1cb sys/kern/kern_descrip.c:818 syscall(ffff800021705af0) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc55c0, count: -8 ddb> show registers rdi 0xffff800020bff402 rsi 0 rbp 0xffff800021705630 rbx 0x1 rdx 0x6 rcx 0x6 rax 0 r8 0x3f8 r9 0xffff800021705588 r10 0xcf9ba717060a396 r11 0xffff800020bff402 r12 0x24402 acpi_pdirpa+0x1026a r13 0xfffffd806a8fc0e8 r14 0x800 r15 0xfffffd806a8fc0e8 rip 0xffffffff813fa4e5 memset+0x45 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800021705438 ss 0x10 memset+0x45: repe stosb %es:(%rdi) ddb> show proc PROC (syz-executor.0) pid=465555 stat=onproc flags process=2 proc=1 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021670fd0,0xffff800021684d30 process=0xffff8000ffff67f0 user=0xffff800021700000, vmspace=0xfffffd807f00c110 estcpu=36, cpticks=2, pctcpu=0.6 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 79483 232584 98778 0 2 0 syz-executor.1 79483 500686 98778 0 2 0x4000000 syz-executor.1 98778 471986 16325 0 3 0x82 nanoslp syz-executor.1 *10660 465555 16325 0 7 0x3 syz-executor.0 16325 1791 25651 0 3 0x82 kqread syz-fuzzer 16325 361885 25651 0 3 0x4000082 thrsleep syz-fuzzer 16325 171513 25651 0 3 0x4000082 thrsleep syz-fuzzer 16325 418458 25651 0 3 0x4000082 thrsleep syz-fuzzer 16325 482743 25651 0 3 0x4000082 thrsleep syz-fuzzer 16325 216553 25651 0 3 0x4000082 thrsleep syz-fuzzer 25651 43694 32239 0 3 0x10008a sigsusp ksh 32239 276738 72182 0 3 0x9a select sshd 64836 170374 1 0 3 0x100083 ttyin getty 72182 152167 1 0 3 0x88 select sshd 38957 408772 40905 73 3 0x100090 kqread syslogd 40905 88245 1 0 3 0x100082 netio syslogd 54201 128304 1 0 3 0x100080 kqread resolvd 10258 381198 76265 77 3 0x100092 kqread dhcpleased 66264 238002 76265 77 3 0x100092 kqread dhcpleased 76265 28249 1 0 3 0x80 kqread dhcpleased 23008 329083 0 0 3 0x14200 bored smr 37283 218371 0 0 2 0x14200 zerothread 51899 406711 0 0 3 0x14200 aiodoned aiodoned 84432 146451 0 0 3 0x14200 syncer update 82384 76532 0 0 3 0x14200 cleaner cleaner 93780 287128 0 0 3 0x14200 reaper reaper 69380 250201 0 0 3 0x14200 pgdaemon pagedaemon 36233 344172 0 0 3 0x14200 bored crynlk 83024 176367 0 0 3 0x14200 bored crypto 18575 408578 0 0 3 0x14200 bored viomb 95584 337539 0 0 3 0x40014200 acpi0 acpi0 23549 80998 0 0 3 0x14200 bored softnet 40489 439813 0 0 3 0x14200 bored systqmp 88477 249297 0 0 3 0x14200 bored systq 38551 60907 0 0 3 0x40014200 bored softclock 26864 188956 0 0 3 0x40014200 idle0 1 162626 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 10102 6355K 6373K 78643K 12979 0 pcb 13 8K 8K 78643K 79 0 rtable 106 3K 3K 78643K 264 0 ifaddr 39 10K 10K 78643K 61 0 counters 21 16K 16K 78643K 24 0 ioctlops 0 0K 2K 78643K 3335 0 iov 0 0K 2K 78643K 258 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1220 77K 77K 78643K 1997 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 49 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 165 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 12332 0 proc 56 54K 71K 78643K 363 0 subproc 32 2K 2K 78643K 85 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 66 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 2K 78643K 450 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 174 23K 23K 78643K 145233 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 5 0K 0K 78643K 18 0 temp 100 4197K 4261K 78643K 33873 0 kqueue 10 14K 14K 78643K 10 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 30 0 27 1 0 1 1 0 8 0 rtentry 112 78 0 34 2 0 2 2 0 8 0 unpcb 120 561 0 548 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpcb 736 134 0 130 4 3 1 3 0 8 0 arp 88 12 0 6 1 0 1 1 0 8 0 inpcb 304 450 0 443 1 0 1 1 0 8 0 nd6 48 15 0 9 1 0 1 1 0 8 0 kcovpl 48 5 0 3 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 320 0 132 12 0 12 12 0 8 0 art_table 32 321 0 132 2 0 2 2 0 8 0 art_node 16 77 0 37 1 0 1 1 0 8 0 semapl 112 163 0 153 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 18472 0 17049 89 0 89 89 0 8 0 ffsino 240 18472 0 17049 84 0 84 84 0 8 0 nchpl 144 39017 0 37414 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 87324 0 87324 1 0 1 1 0 8 1 scxspl 216 93697 0 93697 10 9 1 8 0 8 1 plimitpl 152 19 0 11 1 0 1 1 0 8 0 sigapl 424 12553 0 12522 4 0 4 4 0 8 0 futexpl 56 76145 0 76145 2 1 1 1 0 8 1 knotepl 112 214 0 176 2 0 2 2 0 8 0 kqueuepl 184 342 0 336 1 0 1 1 0 8 0 pipepl 304 90 0 80 1 0 1 1 0 8 0 fdescpl 432 12538 0 12522 3 1 2 3 0 8 0 filepl 120 34429 0 34319 4 0 4 4 0 8 0 lockfpl 104 1824 0 1822 1 0 1 1 0 8 0 lockfspl 48 817 0 815 1 0 1 1 0 8 0 sessionpl 144 20 0 10 1 0 1 1 0 8 0 pgrppl 48 704 0 694 1 0 1 1 0 8 0 ucredpl 96 143 0 132 1 0 1 1 0 8 0 zombiepl 144 12522 0 12522 3 2 1 1 0 8 1 processpl 1008 12553 0 12522 11 6 5 5 0 8 1 procpl 672 25505 0 25468 4 0 4 4 0 8 0 sockpl 448 1041 0 1018 4 1 3 4 0 8 0 mcl64k 65536 20 0 20 7 6 1 1 0 8 1 mcl16k 16384 16 0 16 4 4 0 1 0 8 0 mcl12k 12288 342 0 342 19 18 1 1 0 8 1 mcl9k 9216 39 0 39 10 9 1 1 0 8 1 mcl8k 8192 102 0 102 9 9 0 1 0 8 0 mcl4k 4096 413 0 413 48 47 1 1 0 8 1 mcl2k2 2112 16 0 16 8 8 0 1 0 8 0 mcl2k 2048 21790 0 21746 14 7 7 8 0 8 1 mtagpl 96 3 0 3 1 1 0 1 0 8 0 mbufpl 256 91271 0 91078 25 11 14 17 0 8 0 bufpl 280 16142 0 9735 458 0 458 458 0 8 0 anonpl 24 3078470 0 3072719 47 9 38 38 0 188 1 amapchunkpl 152 343170 0 342850 78 64 14 14 0 158 1 amappl16 200 23361 0 23213 11 3 8 9 0 8 0 amappl14 184 6979 0 6977 1 0 1 1 0 8 0 amappl13 176 46 0 45 1 0 1 1 0 8 0 amappl12 168 10 0 8 1 0 1 1 0 8 0 amappl11 160 53 0 42 1 0 1 1 0 8 0 amappl10 152 40 0 34 1 0 1 1 0 8 0 amappl9 144 237 0 234 1 0 1 1 0 8 0 amappl8 136 5749 0 5701 2 0 2 2 0 8 0 amappl7 128 5359 0 5345 1 0 1 1 0 8 0 amappl6 120 140 0 125 1 0 1 1 0 8 0 amappl5 112 11575 0 11560 1 0 1 1 0 8 0 amappl4 104 1481 0 1457 1 0 1 1 0 8 0 amappl3 96 448 0 446 1 0 1 1 0 8 0 amappl2 88 593 0 539 2 0 2 2 0 8 0 amappl1 80 208072 0 207663 12 3 9 12 0 8 0 amappl 88 144883 0 144774 3 0 3 3 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 64 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 12538 0 12522 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12538 0 12522 1 0 1 1 0 8 0 vmmpekpl 168 55982 0 55963 2 1 1 2 0 8 0 vmmpepl 168 1364037 0 1362683 169 105 64 66 0 357 4 vmsppl 272 12537 0 12522 4 2 2 2 0 8 1 rwobjpl 24 222697 0 221879 8 2 6 6 0 8 0 pdppl 4096 25082 0 25044 164 124 40 44 0 8 2 pvpl 32 5200409 0 5191337 310 231 79 132 0 265 3 pmappl 192 12537 0 12522 1 0 1 1 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 476 0 216 8 0 8 8 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace memset() at memset+0x45 ffs_write(ffff800021705710) at ffs_write+0x932 sys/ufs/ffs/ffs_vnops.c:403 VOP_WRITE(fffffd807e92a2b0,ffff8000217057c8,3,fffffd807f7d8720) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:272 ktrwriteraw(ffff800021684a80,fffffd807e92a2b0,fffffd807f7d8720,ffff800021705890,ffff800021705870) at ktrwriteraw+0x145 sys/kern/kern_ktrace.c:662 ktrstruct(ffff800021684a80,ffffffff82457c0a,ffff800021705940,80) at ktrstruct+0x163 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021684a80,ffffffff82457c0a,ffff800021705940,80) at ktrstruct+0x163 sys/kern/kern_ktrace.c:311 sys_fstat(ffff800021684a80,ffff800021705a20,ffff800021705a80) at sys_fstat+0x1cb sys/kern/kern_descrip.c:818 syscall(ffff800021705af0) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc55c0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace memset() at memset+0x45 ffs_write(ffff800021705710) at ffs_write+0x932 sys/ufs/ffs/ffs_vnops.c:403 VOP_WRITE(fffffd807e92a2b0,ffff8000217057c8,3,fffffd807f7d8720) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:272 ktrwriteraw(ffff800021684a80,fffffd807e92a2b0,fffffd807f7d8720,ffff800021705890,ffff800021705870) at ktrwriteraw+0x145 sys/kern/kern_ktrace.c:662 ktrstruct(ffff800021684a80,ffffffff82457c0a,ffff800021705940,80) at ktrstruct+0x163 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021684a80,ffffffff82457c0a,ffff800021705940,80) at ktrstruct+0x163 sys/kern/kern_ktrace.c:311 sys_fstat(ffff800021684a80,ffff800021705a20,ffff800021705a80) at sys_fstat+0x1cb sys/kern/kern_descrip.c:818 syscall(ffff800021705af0) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc55c0, count: -8