uvm_fault(0xffffffff838fce98, 0xffff800028002180, 0, 2) -> d kernel: page fault trap, code=2 Stopped at memset+0x52: repe stosq %es:(%rdi) TID PID UID PRFLAGS PFLAGS CPU COMMAND 141380 61695 0 0 0 1 syz-executor memset() at memset+0x52 ffs_write(ffff800038811b30) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8079ebcc08,ffff800038811bc8,23,fffffd80097fb208) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8079ebcc08,ffff800038811d00,40,0,1,678d2422de829004,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff80003c4122c0) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff80003c4122c0,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80003c4122c0,ffff800038811f40,ffff800038811e90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800038811f40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038811f40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71b3f0b53030, 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(0xffffffff838fce98, 0xffff800028002180, 0, 2) -> d ddb{0}> trace memset() at memset+0x52 ffs_write(ffff800038811b30) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8079ebcc08,ffff800038811bc8,23,fffffd80097fb208) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8079ebcc08,ffff800038811d00,40,0,1,678d2422de829004,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff80003c4122c0) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff80003c4122c0,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80003c4122c0,ffff800038811f40,ffff800038811e90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800038811f40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038811f40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71b3f0b53030, count: -9 ddb{0}> show registers rdi 0xffff800028002180 rsi 0 rbp 0xffff800038811a50 rbx 0x180 rdx 0 rcx 0xd0 rax 0 r8 0x680 r9 0xffff8000388119b0 r10 0xab309fa97c114c92 r11 0xffff800028002180 r12 0x180 r13 0x800 r14 0xfffffd8079ebcc08 r15 0x1 rip 0xffffffff814817b2 memset+0x52 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800038811848 ss 0 memset+0x52: repe stosq %es:(%rdi) ddb{0}> show proc PROC (syz-executor) tid=419729 pid=60859 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c4122c0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003a409ca8,0xffff8000fffef250 process=0xffff8000377f7510 user=0xffff80003880c000, vmspace=0xfffffd806b9d4b88 estcpu=36, cpticks=4, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 61695 141380 45810 0 7 0 syz-executor 61695 438200 45810 0 3 0x4000080 fsleep syz-executor 61695 443398 45810 0 3 0x4000080 fsleep syz-executor 31300 73260 85845 0 2 0 syz-executor 31300 335659 85845 0 3 0x4000080 ttyretype syz-executor 31300 479686 85845 0 3 0x4000080 kqread syz-executor 79518 62438 50127 0 2 0 syz-executor 79518 514297 50127 0 3 0x4000080 sbwait syz-executor 78765 39547 0 0 3 0x14200 acct acct 60031 309875 41594 0 3 0x80 nanoslp syz-executor 60031 156544 41594 0 3 0x4000080 kqpoll syz-executor 60031 465776 41594 0 3 0x4000080 fsleep syz-executor 67779 287600 81604 0 3 0x80 nanoslp syz-executor 67779 285219 81604 0 3 0x4000080 sbwait syz-executor 67779 430789 81604 0 3 0x4000080 sbwait syz-executor 67779 331404 81604 0 3 0x4000080 fsleep syz-executor 85845 505114 46165 0 3 0x82 nanoslp syz-executor 58000 411595 46165 0 3 0x82 wait syz-executor 10599 293735 46165 0 3 0x82 wait syz-executor 81604 34108 46165 0 3 0x82 nanoslp syz-executor 53480 389971 1 0 3 0x100083 ttyopn getty 50127 418938 46165 0 3 0x82 nanoslp syz-executor 93291 382076 0 0 3 0x14200 bored sosplice 41594 218280 46165 0 3 0x82 nanoslp syz-executor 92643 213415 46165 0 3 0x82 nanoslp syz-executor 45810 125739 46165 0 3 0x82 nanoslp syz-executor 46165 342773 10802 0 3 0x82 kqread syz-executor 10802 197827 59859 0 3 0x10008a sigsusp ksh 59859 431271 69807 0 3 0x98 kqread sshd-session 69807 160713 81769 0 3 0x92 kqread sshd-session 81769 156882 1 0 3 0x88 kqread sshd 97339 168985 20908 74 3 0x1100092 bpf pflogd 20908 74986 1 0 3 0x80 sbwait pflogd 47348 467845 82732 73 3 0x1100090 kqread syslogd 82732 369584 1 0 3 0x100082 sbwait syslogd 29112 385757 1 0 3 0x100080 kqread resolvd 73985 335441 54179 77 3 0x100092 kqread dhcpleased 51863 221925 54179 77 3 0x100092 kqread dhcpleased 54179 829 1 0 3 0x80 kqread dhcpleased 50460 334900 0 0 3 0x14200 bored smr 91135 467447 0 0 2 0x14200 zerothread 39514 303870 0 0 3 0x14200 aiodoned aiodoned 53715 167690 0 0 3 0x14200 syncer update 58481 150106 0 0 3 0x14200 cleaner cleaner 55958 413843 0 0 2 0x14200 reaper 3809 357221 0 0 3 0x14200 pgdaemon pagedaemon 34376 493388 0 0 3 0x14200 bored viomb 30093 127138 0 0 3 0x40014200 acpi0 acpi0 15516 148751 0 0 3 0x40014200 idle1 20601 207391 0 0 3 0x14200 bored softnet1 48564 310450 0 0 3 0x14200 bored softnet0 31149 97009 0 0 3 0x14200 bored systqmp 39350 515124 0 0 3 0x14200 bored systq 21716 298995 0 0 3 0x14200 tmoslp softclockmp 83749 179993 0 0 3 0x40014200 tmoslp softclock 58664 190313 0 0 3 0x40014200 idle0 1 190379 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 61695 (syz-executor) thread 0xffff8000fffee7e0 (141380) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10210 11038K 11351K 166960K 12588 0 pcb 18 14K 16K 166960K 189 0 rtable 204 9K 9K 166960K 522 0 pf 37 18K 20K 166960K 114 0 ifaddr 38 6K 7K 166960K 94 0 ifgroup 55 2K 2K 166960K 142 0 sysctl 4 1K 9K 166960K 10 0 counters 68 36K 38K 166960K 142 0 ioctlops 0 0K 4K 166960K 1597 0 iov 0 0K 16K 166960K 74 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1395 88K 88K 166960K 2121 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 30 0 dirhash 12 2K 3K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 861 0 sigio 0 0K 0K 166960K 18 0 proc 75 131K 196K 166960K 733 0 subproc 72 4K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 93 0 in_multi 77 5K 7K 166960K 192 0 ether_multi 1 0K 0K 166960K 16 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 115 519K 519K 166960K 115 0 exec 0 0K 1K 166960K 563 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 247 167K 182K 166960K 9369 0 UVM aobj 14 2K 2K 166960K 14 0 pinsyscall 43 86K 106K 166960K 2118 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 37 0 NDP 12 0K 2K 166960K 64 0 temp 66 8648K 8718K 166960K 26335 0 kqueue 13 20K 34K 166960K 154 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 231 0 227 3 2 1 3 0 8 0 rtentry 176 159 0 78 5 0 5 5 0 8 0 unpcb 144 734 0 708 8 4 4 6 0 8 2 syncache 336 6 0 6 3 2 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 405 0 399 12 4 8 10 0 8 6 arp 136 17 0 7 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 328 955 0 945 10 2 8 10 0 8 6 nd6 144 28 0 15 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 0 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 ppxss 1192 22 0 22 1 0 1 1 0 8 1 pppxif 1504 2 0 2 1 0 1 1 0 8 1 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 4 0 1 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 19 0 8 1 0 1 1 0 8 0 pfstkey 128 19 0 8 1 0 1 1 0 8 0 pfstate 384 18 0 8 2 0 2 2 0 8 0 pfrule 1344 22 0 16 2 1 1 2 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 691 0 318 31 5 26 29 0 8 1 art_table 40 694 0 318 5 0 5 5 0 8 0 art_node 32 156 0 85 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 5 1 0 1 1 0 8 0 semupl 112 3 0 3 2 1 1 1 0 8 1 semapl 112 26 0 16 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 32 0 15 3 0 3 3 0 8 0 dino2pl 256 3000 0 1482 96 0 96 96 0 8 0 ffsino 296 3000 0 1482 118 0 118 118 0 8 0 nchpl 144 4100 0 2395 64 0 64 64 0 8 0 rtmask 32 5 0 5 2 1 1 1 0 8 1 uvmvnodes 80 3435 0 0 71 0 71 71 0 8 0 vnodes 216 3435 0 0 191 0 191 191 0 8 0 namei 1024 15569 0 15569 2 1 1 2 0 8 1 percpumem 16 86 0 37 1 0 1 1 0 8 0 kstatmem 264 80 0 52 3 0 3 3 0 8 0 scsiplug 72 4 0 4 2 1 1 1 0 8 1 scxspl 216 17889 0 17889 10 5 5 8 1 8 5 plimitpl 152 323 0 303 1 0 1 1 0 8 0 sigapl 424 1164 0 1114 7 1 6 7 0 8 0 knotepl 120 536 0 0 17 0 17 17 0 8 0 kqueuepl 224 290 0 278 4 1 3 3 0 8 2 pipepl 344 172 0 145 3 0 3 3 0 8 0 fdescpl 528 1144 0 1113 3 0 3 3 0 8 0 filepl 160 7675 0 7438 21 5 16 21 0 8 3 lockfpl 104 391 0 385 2 0 2 2 0 8 1 lockfspl 48 118 0 114 1 0 1 1 0 8 0 sessionpl 144 31 0 22 1 0 1 1 0 8 0 pgrppl 48 51 0 34 1 0 1 1 0 8 0 ucredpl 104 1433 0 1420 1 0 1 1 0 8 0 zombiepl 144 1117 0 1114 1 0 1 1 0 8 0 processpl 1232 1164 0 1114 5 1 4 5 0 8 0 procpl 664 2320 0 2259 6 0 6 6 0 8 0 sosppl 168 10 0 10 2 1 1 1 0 8 1 sockpl 752 1940 0 1900 26 15 11 23 0 8 6 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 104 0 0 13 0 13 13 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 53 0 0 7 1 6 7 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 1146 0 0 72 0 72 72 0 8 0 bufpl 280 7835 0 1692 440 0 440 440 0 8 1 anonpl 32 8027 0 0 65 0 65 65 0 246 0 amapchunkpl 152 30447 0 29931 31 6 25 27 0 158 1 amappl16 200 4620 0 4588 21 6 15 16 0 8 7 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 131 0 119 1 0 1 1 0 8 0 amappl13 176 54 0 54 2 1 1 1 0 8 1 amappl12 168 1883 0 1851 4 2 2 3 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 31 0 31 1 1 0 1 0 8 0 amappl9 144 257 0 257 1 1 0 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 121 0 109 1 0 1 1 0 8 0 amappl6 120 230 0 226 1 0 1 1 0 8 0 amappl5 112 140 0 130 1 0 1 1 0 8 0 amappl4 104 334 0 315 1 0 1 1 0 8 0 amappl3 96 5277 0 5176 3 0 3 3 0 8 0 amappl2 88 1414 0 1333 2 0 2 2 0 8 0 amappl1 80 12420 0 11815 15 0 15 15 0 8 0 amappl 88 8450 0 8276 5 0 5 5 0 92 0 dma65536 65536 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 128 253 0 253 1 1 0 1 0 8 0 dma64 64 7 0 7 2 1 1 1 0 8 1 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 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1144 0 1112 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1144 0 1112 1 0 1 1 0 8 0 vmmpekpl 168 10423 0 10373 3 0 3 3 0 8 0 vmmpepl 168 79214 0 77173 107 2 105 105 0 357 8 vmsppl 488 1143 0 1112 5 0 5 5 0 8 0 rwobjpl 80 27283 0 22893 94 0 94 94 0 8 1 pdppl 4096 2296 0 2224 110 36 74 86 0 8 2 pvpl 32 15516 0 0 125 0 125 125 0 265 0 pmappl 256 1143 0 1112 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 362 0 52 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace memset() at memset+0x52 ffs_write(ffff800038811b30) at ffs_write+0xb9a sys/ufs/ffs/ffs_vnops.c:401 VOP_WRITE(fffffd8079ebcc08,ffff800038811bc8,23,fffffd80097fb208) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245 vn_rdwr(1,fffffd8079ebcc08,ffff800038811d00,40,0,1,678d2422de829004,0,1008,40) at vn_rdwr+0x12d sys/kern/vfs_vnops.c:324 acct_process(ffff80003c4122c0) at acct_process+0x7a2 sys/kern/kern_acct.c:245 exit1(ffff80003c4122c0,0,0,1) at exit1+0x5c4 sys/kern/kern_exit.c:228 sys_exit(ffff80003c4122c0,ffff800038811f40,ffff800038811e90) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800038811f40) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038811f40) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71b3f0b53030, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 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(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 uvm_fault(fffffd806ef85b78,ce4443d3000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:656 upageflttrap(ffff80002a3742c0,ce4443d3000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a3742c0) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x72d09e491ff0, count: 7 ddb{1}> trace x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 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(ffffffff838f9428) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838f9428) at __mp_lock+0x192 sys/kern/kern_lock.c:165 uvm_fault(fffffd806ef85b78,ce4443d3000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:656 upageflttrap(ffff80002a3742c0,ce4443d3000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80002a3742c0) at usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x72d09e491ff0, count: -8