uvm_fault(0xfffffd806cd10740, 0x0, 0, 2) -> e kernel: page fault trap, code=2 Stopped at km_free+0x191: movq $0,0(%rax) TID PID UID PRFLAGS PFLAGS CPU COMMAND *499580 6536 0 0 0x4000000 0 syz-executor km_free(0,1000,ffffffff835f7bc8,ffffffff835f7be0) at km_free+0x191 sys/uvm/uvm_km.c:672 pool_p_free(ffffffff839fe858,fffffd806c2bff90) at pool_p_free+0x1cd sys/kern/subr_pool.c:1018 pool_reclaim(ffffffff839fe858) at pool_reclaim+0x2c2 sys/kern/subr_pool.c:1156 pool_reclaim_all() at pool_reclaim_all+0x48 sys/kern/subr_pool.c:-1 kern_sysctl(ffff8000380f0e94,1,200000000180,ffff8000380f0ec8,200000001180,4,1f1489ef28775d6e) at kern_sysctl+0x1094 sys/kern/kern_sysctl.c:687 sys_sysctl(ffff80002f0ba558,ffff8000380f0ff0,ffff8000380f0f40) at sys_sysctl+0x3e5 sys/kern/kern_sysctl.c:-1 syscall(ffff8000380f0ff0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000380f0ff0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd554be10cb0, 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(0xfffffd806cd10740, 0x0, 0, 2) -> e ddb> trace km_free(0,1000,ffffffff835f7bc8,ffffffff835f7be0) at km_free+0x191 sys/uvm/uvm_km.c:672 pool_p_free(ffffffff839fe858,fffffd806c2bff90) at pool_p_free+0x1cd sys/kern/subr_pool.c:1018 pool_reclaim(ffffffff839fe858) at pool_reclaim+0x2c2 sys/kern/subr_pool.c:1156 pool_reclaim_all() at pool_reclaim_all+0x48 sys/kern/subr_pool.c:-1 kern_sysctl(ffff8000380f0e94,1,200000000180,ffff8000380f0ec8,200000001180,4,1f1489ef28775d6e) at kern_sysctl+0x1094 sys/kern/kern_sysctl.c:687 sys_sysctl(ffff80002f0ba558,ffff8000380f0ff0,ffff8000380f0f40) at sys_sysctl+0x3e5 sys/kern/kern_sysctl.c:-1 syscall(ffff8000380f0ff0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000380f0ff0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd554be10cb0, count: -8 ddb> show registers rdi 0x1000 __ALIGN_SIZE rsi 0x28000000 rbp 0xffff8000380f0b70 rbx 0xffffffff835f7bc8 kv_page rdx 0 rcx 0xffffffff835f7be0 kp_dirty rax 0 r8 0 r9 0 r10 0xe668cd026a2efc14 r11 0xd41661f036533b08 r12 0x1000 __ALIGN_SIZE r13 0 r14 0x1000 __ALIGN_SIZE r15 0x28000000000 rip 0xffffffff81bb4551 km_free+0x191 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000380f0b00 ss 0x10 km_free+0x191: movq $0,0(%rax) ddb> show proc PROC (syz-executor) tid=499580 pid=6536 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002f0bb780,0xffff80002f0bbcc0 process=0xffff8000ffff8918 user=0xffff8000380ec000, vmspace=0xfffffd806cd10740 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 70935 445730 46825 60928 2 0x10 syz-executor 70935 390547 46825 60928 3 0x4000090 fsleep syz-executor 6536 149987 87131 0 2 0 syz-executor * 6536 499580 87131 0 7 0x4000000 syz-executor 34016 362200 61521 0 3 0x80 nanoslp syz-executor 34016 149773 61521 0 3 0x4000080 bell syz-executor 34016 354966 61521 0 3 0x4000080 fsleep syz-executor 89315 460934 48813 0 3 0x80 nanoslp syz-executor 89315 491187 48813 0 3 0x4000080 fifor syz-executor 89315 191792 48813 0 3 0x4000080 fsleep syz-executor 83585 365746 17670 -1 3 0x90 nanoslp syz-executor 83585 127498 17670 -1 3 0x4000090 lockf syz-executor 83585 367156 17670 -1 3 0x4000090 lockf syz-executor 83585 462903 17670 -1 3 0x4000090 fsleep syz-executor 44614 442398 82103 0 3 0x80 nanoslp syz-executor 44614 285975 82103 0 3 0x4000080 netacc syz-executor 44614 107399 82103 0 3 0x4000080 fsleep syz-executor 46825 194208 26648 0 2 0xc82 syz-executor 4655 369712 0 0 3 0x14280 nfsidl nfsio 82198 151785 0 0 3 0x14280 nfsidl nfsio 82342 20983 0 0 3 0x14280 nfsidl nfsio 81245 354815 0 0 3 0x14280 nfsidl nfsio 42165 30435 0 0 3 0x14280 nfsidl nfsio 52429 484117 0 0 3 0x14280 nfsidl nfsio 5675 458827 0 0 3 0x14280 nfsidl nfsio 29392 319154 0 0 3 0x14280 nfsidl nfsio 10172 74444 0 0 3 0x14280 nfsidl nfsio 51589 326582 0 0 3 0x14280 nfsidl nfsio 21113 404845 0 0 3 0x14280 nfsidl nfsio 63273 364813 0 0 3 0x14280 nfsidl nfsio 44270 249863 0 0 3 0x14280 nfsidl nfsio 63378 123706 0 0 3 0x14280 nfsidl nfsio 34466 6117 0 0 3 0x14280 nfsidl nfsio 64030 374302 0 0 3 0x14280 nfsidl nfsio 60664 181195 0 0 3 0x14280 nfsidl nfsio 42942 303468 0 0 3 0x14280 nfsidl nfsio 21131 283923 0 0 3 0x14280 nfsidl nfsio 69487 224179 0 0 3 0x14280 nfsidl nfsio 2727 79187 1 0 3 0x100083 ttyin getty 87131 162652 26648 0 2 0xc82 syz-executor 17670 67807 26648 0 3 0x82 nanoslp syz-executor 45325 224912 26648 0 2 0xc82 syz-executor 61521 84540 26648 0 3 0x82 nanoslp syz-executor 82103 164452 26648 0 3 0x82 nanoslp syz-executor 4028 147086 26648 0 3 0x82 wait syz-executor 48813 48307 26648 0 3 0x82 nanoslp syz-executor 26648 483846 1208 0 3 0x82 kqread syz-executor 1208 340441 69348 0 3 0x10008a sigsusp ksh 69348 498884 18148 0 3 0x98 kqread sshd-session 18148 295841 69293 0 3 0x92 kqread sshd-session 69293 8550 1 0 3 0x88 kqread sshd 69284 25731 21790 73 3 0x1100090 kqread syslogd 21790 138405 1 0 3 0x100082 sbwait syslogd 96226 474754 1 0 3 0x100080 kqread resolvd 67277 57302 16555 77 3 0x100092 kqread dhcpleased 21152 492777 16555 77 3 0x100092 kqread dhcpleased 16555 366306 1 0 3 0x80 kqread dhcpleased 49989 458497 0 0 3 0x14200 bored smr 44843 370409 0 0 2 0x14200 zerothread 60347 350356 0 0 3 0x14200 aiodoned aiodoned 20733 333044 0 0 3 0x14200 syncer update 52858 403988 0 0 3 0x14200 cleaner cleaner 43274 95771 0 0 3 0x14200 reaper reaper 14426 490103 0 0 3 0x14200 pgdaemon pagedaemon 56897 429131 0 0 3 0x14200 bored viomb 72714 437647 0 0 3 0x40014200 acpi0 acpi0 41497 348733 0 0 3 0x14200 bored softnet0 86716 227087 0 0 3 0x14200 bored systqmp 20780 223481 0 0 3 0x14200 bored systq 81888 284548 0 0 3 0x40014200 tmoslp softclock 6554 84673 0 0 3 0x40014200 idle0 1 352388 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11083 12169K 12668K 166960K 14659 0 pcb 19 16K 18K 166960K 574 0 rtable 223 9K 10K 166960K 533 0 pf 31 13K 17K 166960K 134 0 ifaddr 37 6K 8K 166960K 94 0 ifgroup 43 1K 2K 166960K 145 0 sysctl 4 1K 9K 166960K 20 0 counters 32 17K 18K 166960K 81 0 ioctlops 0 0K 4K 166960K 301 0 iov 0 0K 24K 166960K 57 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1446 91K 91K 166960K 2813 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 22 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 39 0 dirhash 12 2K 2K 166960K 42 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1238 0 sigio 0 0K 0K 166960K 19 0 proc 61 59K 91K 166960K 654 0 subproc 72 4K 4K 166960K 92 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 140 0 in_multi 78 5K 7K 166960K 144 0 ether_multi 1 0K 0K 166960K 13 0 mrt 1 0K 0K 166960K 33 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 501 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 251 152K 170K 166960K 12599 0 UVM aobj 40 11K 11K 166960K 47 0 pinsyscall 39 78K 94K 166960K 2386 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 68 0 NDP 10 0K 2K 166960K 67 0 temp 79 9076K 9166K 166960K 86205 0 kqueue 14 22K 31K 166960K 195 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 117 0 114 1 0 1 1 0 8 0 rtentry 136 158 0 66 5 0 5 5 0 8 0 unpcb 144 1136 0 1117 6 5 1 6 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 406 0 400 7 6 1 7 0 8 0 arp 96 26 0 8 1 0 1 1 0 8 0 ipq 40 6 0 1 1 0 1 1 0 8 0 ipqe 40 71 0 66 1 0 1 1 0 8 0 inpcb 328 1441 0 1428 7 5 2 7 0 8 0 ip6q 72 2 0 0 1 0 1 1 0 8 0 ip6af 40 2 0 0 1 0 1 1 0 8 0 nd6 112 36 0 14 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 1 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1072 39 0 39 1 1 0 1 0 8 0 pppxif 1416 3 0 3 1 1 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfqueue 320 34 0 33 1 0 1 1 0 8 0 pfstitem 24 5 0 0 1 0 1 1 0 8 0 pfstkey 128 9 0 5 1 0 1 1 0 8 0 pfstate 384 6 0 3 1 0 1 1 0 8 0 pfrule 1360 9 0 9 1 1 0 1 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 639 0 286 31 8 23 31 0 8 0 art_table 40 642 0 286 5 0 5 5 0 8 0 art_node 32 158 0 80 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 34 0 24 1 0 1 1 0 8 0 shmpl 112 40 0 6 1 0 1 1 0 8 0 dirhash 1024 37 0 20 3 0 3 3 0 8 0 dino2pl 256 3759 0 2303 92 0 92 92 0 8 0 ffsino 256 3759 0 2303 92 0 92 92 0 8 0 nchpl 144 5425 0 3721 64 0 64 64 0 8 0 rtmask 32 8 0 8 1 1 0 1 0 8 0 vnodes 216 4746 0 0 264 0 264 264 0 8 0 namei 1024 19727 0 19727 2 2 0 2 0 8 0 vcpupl 3904 4 0 1 1 0 1 1 0 8 0 vmpool 808 4 0 1 1 0 1 1 0 8 0 kstatmem 264 92 0 72 2 0 2 2 0 8 0 scsiplug 72 4 0 4 1 1 0 1 0 8 0 scxspl 216 28089 0 28089 8 3 5 8 1 8 5 plimitpl 152 474 0 457 1 0 1 1 0 8 0 sigapl 424 1540 0 1477 8 0 8 8 0 8 0 knotepl 120 324752 0 324701 15 5 10 15 0 8 7 kqueuepl 184 343 0 333 3 0 3 3 0 8 2 pipepl 304 246 0 219 5 0 5 5 0 8 2 fdescpl 448 1505 0 1475 5 0 5 5 0 8 1 filepl 120 10516 0 10287 13 0 13 13 0 8 5 lockfpl 104 570 0 564 1 0 1 1 0 8 0 lockfspl 48 236 0 232 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 50 0 34 1 0 1 1 0 8 0 ucredpl 104 1786 0 1771 1 0 1 1 0 8 0 zombiepl 144 1479 0 1477 1 0 1 1 0 8 0 processpl 1152 1540 0 1477 5 0 5 5 0 8 0 procpl 664 3155 0 3081 7 0 7 7 0 8 0 sosppl 176 9 0 9 1 0 1 1 0 8 1 sockpl 552 2743 0 2708 12 2 10 12 0 8 7 mcl64k 65536 67 0 67 1 0 1 1 0 8 1 mcl12k 12288 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 11 0 11 1 0 1 1 0 8 1 mcl4k 4096 3920 0 3866 14 0 14 14 0 8 6 mcl2k 2048 1278 0 1272 3 0 3 3 0 8 2 mtagpl 96 99 0 59 2 0 2 2 0 8 0 mbufpl 256 17303 0 17107 74 52 22 74 0 8 8 bufpl 280 10393 0 4179 445 0 445 445 0 8 0 anonpl 24 249664 0 241153 76 0 76 76 0 187 0 amapchunkpl 152 55256 0 54627 37 0 37 37 0 158 11 amappl16 200 6298 0 6038 57 30 27 27 0 8 0 amappl15 192 8 0 8 1 0 1 1 0 8 1 amappl14 184 456 0 455 1 0 1 1 0 8 0 amappl13 176 151 0 141 1 0 1 1 0 8 0 amappl12 168 1770 0 1741 2 0 2 2 0 8 0 amappl11 160 76 0 76 1 0 1 1 0 8 1 amappl10 152 63 0 52 1 0 1 1 0 8 0 amappl9 144 289 0 289 1 0 1 1 0 8 1 amappl8 136 108 0 106 1 0 1 1 0 8 0 amappl7 128 151 0 140 1 0 1 1 0 8 0 amappl6 120 173 0 171 1 0 1 1 0 8 0 amappl5 112 114 0 106 1 0 1 1 0 8 0 amappl4 104 298 0 281 1 0 1 1 0 8 0 amappl3 96 8499 0 8376 4 0 4 4 0 8 0 amappl2 88 542 0 488 2 0 2 2 0 8 0 amappl1 80 14035 0 13480 16 0 16 16 0 8 3 amappl 88 11675 0 11487 5 0 5 5 0 92 0 uvmvnodes 80 142 0 0 3 0 3 3 0 8 0 dma4096 4096 2 0 2 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 1 0 1 1 0 8 1 dma128 128 256 0 256 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 46 0 7 1 0 1 1 0 8 0 uaddrrnd 24 1505 0 1475 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1505 0 1475 1 0 1 1 0 8 0 vmmpekpl 168 12832 0 12790 3 0 3 3 0 8 0 vmmpepl 168 101594 0 99498 102 0 102 102 0 357 4 vmsppl 368 1504 0 1475 4 0 4 4 0 8 1 rwobjpl 40 29200 0 27902 16 0 16 16 0 8 0 pdppl 4096 3024 0 2955 107 36 71 80 0 8 2 pvpl 32 682550 0 666733 167 0 167 167 0 265 11 pmappl 216 1508 0 1476 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 445 0 106 12 0 12 12 0 8 1 ddb> machine ddbcpu 0 No such command ddb> trace km_free(0,1000,ffffffff835f7bc8,ffffffff835f7be0) at km_free+0x191 sys/uvm/uvm_km.c:672 pool_p_free(ffffffff839fe858,fffffd806c2bff90) at pool_p_free+0x1cd sys/kern/subr_pool.c:1018 pool_reclaim(ffffffff839fe858) at pool_reclaim+0x2c2 sys/kern/subr_pool.c:1156 pool_reclaim_all() at pool_reclaim_all+0x48 sys/kern/subr_pool.c:-1 kern_sysctl(ffff8000380f0e94,1,200000000180,ffff8000380f0ec8,200000001180,4,1f1489ef28775d6e) at kern_sysctl+0x1094 sys/kern/kern_sysctl.c:687 sys_sysctl(ffff80002f0ba558,ffff8000380f0ff0,ffff8000380f0f40) at sys_sysctl+0x3e5 sys/kern/kern_sysctl.c:-1 syscall(ffff8000380f0ff0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000380f0ff0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd554be10cb0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace km_free(0,1000,ffffffff835f7bc8,ffffffff835f7be0) at km_free+0x191 sys/uvm/uvm_km.c:672 pool_p_free(ffffffff839fe858,fffffd806c2bff90) at pool_p_free+0x1cd sys/kern/subr_pool.c:1018 pool_reclaim(ffffffff839fe858) at pool_reclaim+0x2c2 sys/kern/subr_pool.c:1156 pool_reclaim_all() at pool_reclaim_all+0x48 sys/kern/subr_pool.c:-1 kern_sysctl(ffff8000380f0e94,1,200000000180,ffff8000380f0ec8,200000001180,4,1f1489ef28775d6e) at kern_sysctl+0x1094 sys/kern/kern_sysctl.c:687 sys_sysctl(ffff80002f0ba558,ffff8000380f0ff0,ffff8000380f0f40) at sys_sysctl+0x3e5 sys/kern/kern_sysctl.c:-1 syscall(ffff8000380f0ff0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000380f0ff0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd554be10cb0, count: -8