uvm_fault(0xfffffd806c25b168, 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 *459121 39871 0 0x8000000 0x4000000 0 syz-executor km_free(0,1000,ffffffff832374a0,ffffffff832374b8) at km_free+0x191 sys/uvm/uvm_km.c:870 pool_p_free(ffffffff834f1d10,fffffd805c1a1f90) at pool_p_free+0x1ba sys/kern/subr_pool.c:1012 pool_reclaim(ffffffff834f1d10) at pool_reclaim+0x2a6 sys/kern/subr_pool.c:1151 pool_reclaim_all() at pool_reclaim_all+0x48 kern_sysctl_locked(ffff80002a5af224,1,0,ffff80002a5af258,20001440,4,5542b643c7322394) at kern_sysctl_locked+0x15f9 sys/kern/kern_sysctl.c:728 kern_sysctl(ffff80002a5af224,1,0,ffff80002a5af258,20001440,4,dde1a5747b7dec56) at kern_sysctl+0x9b2 sys/kern/kern_sysctl.c:577 sys_sysctl(ffff800037623460,ffff80002a5af390,ffff80002a5af2e0) at sys_sysctl+0x41f syscall(ffff80002a5af390) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a724d5a2b0, 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(0xfffffd806c25b168, 0x0, 0, 2) -> e ddb> trace km_free(0,1000,ffffffff832374a0,ffffffff832374b8) at km_free+0x191 sys/uvm/uvm_km.c:870 pool_p_free(ffffffff834f1d10,fffffd805c1a1f90) at pool_p_free+0x1ba sys/kern/subr_pool.c:1012 pool_reclaim(ffffffff834f1d10) at pool_reclaim+0x2a6 sys/kern/subr_pool.c:1151 pool_reclaim_all() at pool_reclaim_all+0x48 kern_sysctl_locked(ffff80002a5af224,1,0,ffff80002a5af258,20001440,4,5542b643c7322394) at kern_sysctl_locked+0x15f9 sys/kern/kern_sysctl.c:728 kern_sysctl(ffff80002a5af224,1,0,ffff80002a5af258,20001440,4,dde1a5747b7dec56) at kern_sysctl+0x9b2 sys/kern/kern_sysctl.c:577 sys_sysctl(ffff800037623460,ffff80002a5af390,ffff80002a5af2e0) at sys_sysctl+0x41f syscall(ffff80002a5af390) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a724d5a2b0, count: -9 ddb> show registers rdi 0xffff800030df0000 rsi 0x103b6 __ALIGN_SIZE+0xf3b6 rbp 0xffff80002a5aee80 rbx 0xffffffff832374a0 kv_page rdx 0xffff800030df0000 rcx 0x103b5 __ALIGN_SIZE+0xf3b5 rax 0 r8 0 r9 0 r10 0x18ed376943c55a38 r11 0xc6376a61cd4de7a3 r12 0x1000 __ALIGN_SIZE r13 0 r14 0x1000 __ALIGN_SIZE r15 0x28000000000 rip 0xffffffff81bfcde1 km_free+0x191 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a5aee10 ss 0x10 km_free+0x191: movq $0,0(%rax) ddb> show proc PROC (syz-executor) tid=459121 pid=39871 tcnt=2 stat=onproc flags process=8000000 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800037622020,0xffff800037622f60 process=0xffff80002a4e2010 user=0xffff80002a5aa000, vmspace=0xfffffd806c25b168 estcpu=8, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 98540 178507 23308 0 2 0x8000000 syz-executor 98540 434025 23308 0 3 0xc000080 fsleep syz-executor 5431 320084 89204 0 2 0x8000000 syz-executor 5431 367770 89204 0 3 0xc000080 fsleep syz-executor 39871 51558 38561 0 2 0x8000000 syz-executor *39871 459121 38561 0 7 0xc000000 syz-executor 72778 513030 0 0 3 0x14200 acct acct 34183 349402 1 0 3 0x18000082 nanoslp getty 49396 485853 24204 0 3 0x8000080 nanoslp syz-executor 49396 521242 24204 0 3 0xc000000 smrbar syz-executor 49396 247979 24204 0 3 0xc000080 fsleep syz-executor 59157 171018 64632 0 3 0x8000002 clonelk syz-executor 30978 464287 64632 0 3 0x8000082 piperd syz-executor 62417 17990 64632 0 3 0x8000082 piperd syz-executor 27564 234293 64632 0 2 0x8000482 syz-executor 38561 159363 64632 0 2 0x8000482 syz-executor 23308 83642 64632 0 2 0x8000482 syz-executor 24204 512530 64632 0 3 0x8000082 nanoslp syz-executor 89204 44956 64632 0 2 0x8000482 syz-executor 36415 436587 0 0 3 0x14200 bored sosplice 64632 75493 34596 0 2 0x8000002 syz-executor 34596 142685 18537 0 3 0x810008a sigsusp ksh 18537 90844 21413 0 3 0x18000098 kqread sshd-session 21413 197815 62918 0 3 0x18000092 kqread sshd-session 62918 94309 1 0 3 0x18000088 kqread sshd 69187 158775 12648 73 3 0x19100090 kqread syslogd 12648 402432 1 0 3 0x18100082 sbwait syslogd 73881 447343 1 0 3 0x18100080 kqread resolvd 6641 346341 36070 77 3 0x18100092 kqread dhcpleased 46356 501576 36070 77 3 0x18100092 kqread dhcpleased 36070 272311 1 0 3 0x18000080 kqread dhcpleased 5326 222153 0 0 3 0x14200 bored smr 47308 247328 0 0 2 0x14200 zerothread 36548 445312 0 0 3 0x14200 aiodoned aiodoned 62759 94592 0 0 3 0x14200 syncer update 17035 33798 0 0 3 0x14200 cleaner cleaner 65317 132801 0 0 3 0x14200 reaper reaper 45310 38276 0 0 3 0x14200 pgdaemon pagedaemon 19670 516848 0 0 3 0x14200 bored viomb 82510 148047 0 0 3 0x40014200 acpi0 acpi0 34476 257560 0 0 3 0x14200 bored softnet3 48110 305262 0 0 3 0x14200 bored softnet2 60475 69394 0 0 3 0x14200 bored softnet1 14138 115381 0 0 2 0x14200 softnet0 91391 107164 0 0 3 0x14200 bored systqmp 23366 63190 0 0 3 0x14200 bored systq 56906 136972 0 0 3 0x40014200 tmoslp softclock 37575 343722 0 0 3 0x40014200 idle0 1 56034 0 0 3 0x8000082 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 10187 10232K 10546K 166960K 12709 0 pcb 17 16K 18K 166960K 401 0 rtable 191 8K 10K 166960K 1234 0 pf 36 14K 16K 166960K 137 0 ifaddr 39 6K 8K 166960K 166 0 ifgroup 55 2K 2K 166960K 211 0 sysctl 3 0K 1K 166960K 7 0 counters 31 17K 18K 166960K 71 0 ioctlops 0 0K 4K 166960K 258 0 iov 0 0K 16K 166960K 152 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1461 92K 92K 166960K 2692 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 24 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 188 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 15 53K 93K 166960K 1160 0 sigio 0 0K 0K 166960K 14 0 proc 59 59K 116K 166960K 1213 0 subproc 104 6K 6K 166960K 429 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 126 0 in_multi 78 5K 7K 166960K 399 0 ether_multi 1 0K 0K 166960K 3 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 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 779 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 211 76K 92K 166960K 10828 0 UVM aobj 79 3K 3K 166960K 81 0 pinsyscall 36 72K 96K 166960K 2809 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 46 0 NDP 12 0K 2K 166960K 118 0 temp 74 6812K 6880K 166960K 48685 0 kqueue 13 20K 32K 166960K 172 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 120 321 0 318 3 2 1 3 0 8 0 rtentry 112 400 0 317 4 1 3 4 0 8 0 unpcb 144 1383 0 1366 6 4 2 6 0 8 0 syncache 336 9 0 9 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 516 0 511 14 13 1 14 0 8 0 arp 88 70 0 54 1 0 1 1 0 8 0 ipq 40 4 0 4 1 1 0 1 0 8 0 ipqe 40 5 0 5 1 1 0 1 0 8 0 inpcb 336 1693 0 1684 21 19 2 21 0 8 0 nd6 104 105 0 87 1 0 1 1 0 8 0 pkpcb 40 12 0 12 1 1 0 1 0 8 0 kcovpl 48 33 0 25 1 0 1 1 0 8 0 ppxss 1072 5 0 5 1 1 0 1 0 8 0 pfstscr 40 3 0 3 1 1 0 1 0 8 0 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfrktable 1344 1 0 1 1 1 0 1 0 8 0 pftag 88 5 0 2 1 0 1 1 0 8 0 pfstitem 24 4 0 0 1 0 1 1 0 8 0 pfstkey 128 7 0 3 1 0 1 1 0 8 0 pfstate 344 4 0 2 1 0 1 1 0 8 0 pfrule 1344 27 0 25 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 1586 0 1226 31 2 29 30 0 8 0 art_table 32 1588 0 1226 4 0 4 4 0 8 0 art_node 16 397 0 324 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 9 1 0 1 1 0 8 0 semapl 112 184 0 174 1 0 1 1 0 8 0 shmpl 112 78 0 2 3 0 3 3 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 3085 0 1546 97 0 97 97 0 8 0 ffsino 240 3085 0 1546 91 0 91 91 0 8 0 nchpl 144 4282 0 2577 64 0 64 64 0 8 0 uvmvnodes 80 4166 0 0 86 0 86 86 0 8 0 vnodes 216 4166 0 0 232 0 232 232 0 8 0 namei 1024 18823 0 18823 2 2 0 2 0 8 0 vcpupl 3904 9 0 1 1 0 1 1 0 8 0 vmpool 664 10 0 2 1 0 1 1 0 8 0 kstatmem 264 104 0 80 3 1 2 3 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 23790 0 23790 8 7 1 8 1 8 1 plimitpl 152 220 0 202 1 0 1 1 0 8 0 sigapl 424 1392 0 1347 6 0 6 6 0 8 0 futexpl 64 15532 0 15529 1 0 1 1 0 8 0 knotepl 120 26421 0 26374 10 7 3 10 0 8 0 kqueuepl 184 395 0 382 4 3 1 4 0 8 0 pipepl 288 303 0 275 5 2 3 5 0 8 0 fdescpl 432 1373 0 1346 5 1 4 5 0 8 0 filepl 120 11430 0 11177 16 7 9 16 0 8 0 lockfpl 104 415 0 412 2 1 1 2 0 8 0 lockfspl 48 182 0 179 1 0 1 1 0 8 0 sessionpl 144 47 0 40 1 0 1 1 0 8 0 pgrppl 48 93 0 78 1 0 1 1 0 8 0 ucredpl 104 1286 0 1275 1 0 1 1 0 8 0 zombiepl 144 1348 0 1347 1 0 1 1 0 8 0 processpl 1088 1392 0 1347 4 0 4 4 0 8 0 procpl 648 2443 0 2393 6 1 5 6 0 8 0 sosppl 168 5 0 5 1 1 0 1 0 8 0 sockpl 504 3417 0 3388 78 73 5 33 0 8 0 mcl64k 65536 14 0 14 1 1 0 1 0 8 0 mcl16k 16384 4 0 4 1 1 0 1 0 8 0 mcl12k 12288 1 0 1 1 1 0 1 0 8 0 mcl8k 8192 29 0 29 1 1 0 1 0 8 0 mcl4k 4096 5 0 5 1 1 0 1 0 8 0 mcl2k2 2112 3 0 3 1 1 0 1 0 8 0 mcl2k 2048 7513 0 7399 26 11 15 26 0 8 0 mtagpl 96 23 0 20 1 0 1 1 0 8 0 mbufpl 256 17623 0 17407 35 20 15 35 0 8 0 bufpl 280 7341 0 1096 447 0 447 447 0 8 0 anonpl 24 256859 0 253716 58 5 53 58 0 187 27 amapchunkpl 152 36266 0 35844 38 0 38 38 0 158 21 amappl16 200 5596 0 5572 20 8 12 15 0 8 8 amappl15 192 14 0 14 1 0 1 1 0 8 1 amappl14 184 154 0 144 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 0 1 1 0 8 1 amappl12 168 2411 0 2384 2 0 2 2 0 8 0 amappl11 160 48 0 38 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 0 1 1 0 8 1 amappl9 144 128 0 128 1 0 1 1 0 8 1 amappl8 136 15 0 14 1 0 1 1 0 8 0 amappl7 128 148 0 138 1 0 1 1 0 8 0 amappl6 120 407 0 406 1 0 1 1 0 8 0 amappl5 112 226 0 216 1 0 1 1 0 8 0 amappl4 104 362 0 347 1 0 1 1 0 8 0 amappl3 96 7044 0 6946 4 0 4 4 0 8 0 amappl2 88 941 0 884 2 0 2 2 0 8 0 amappl1 80 12095 0 11562 14 0 14 14 0 8 2 amappl 88 10242 0 10092 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 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 80 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1383 0 1348 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1383 0 1348 1 0 1 1 0 8 0 vmmpekpl 168 12605 0 12556 3 0 3 3 0 8 0 vmmpepl 168 91062 0 89404 92 0 92 92 0 357 15 vmsppl 344 1382 0 1348 4 0 4 4 0 8 0 rwobjpl 24 32276 0 27192 31 0 31 31 0 8 0 pdppl 4096 2772 0 2704 130 60 70 80 0 8 2 pvpl 32 697142 0 687950 224 0 224 224 0 265 137 pmappl 216 1382 0 1348 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 548 0 207 13 0 13 13 0 8 1 ddb> machine ddbcpu 0 No such command ddb> trace km_free(0,1000,ffffffff832374a0,ffffffff832374b8) at km_free+0x191 sys/uvm/uvm_km.c:870 pool_p_free(ffffffff834f1d10,fffffd805c1a1f90) at pool_p_free+0x1ba sys/kern/subr_pool.c:1012 pool_reclaim(ffffffff834f1d10) at pool_reclaim+0x2a6 sys/kern/subr_pool.c:1151 pool_reclaim_all() at pool_reclaim_all+0x48 kern_sysctl_locked(ffff80002a5af224,1,0,ffff80002a5af258,20001440,4,5542b643c7322394) at kern_sysctl_locked+0x15f9 sys/kern/kern_sysctl.c:728 kern_sysctl(ffff80002a5af224,1,0,ffff80002a5af258,20001440,4,dde1a5747b7dec56) at kern_sysctl+0x9b2 sys/kern/kern_sysctl.c:577 sys_sysctl(ffff800037623460,ffff80002a5af390,ffff80002a5af2e0) at sys_sysctl+0x41f syscall(ffff80002a5af390) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a724d5a2b0, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace km_free(0,1000,ffffffff832374a0,ffffffff832374b8) at km_free+0x191 sys/uvm/uvm_km.c:870 pool_p_free(ffffffff834f1d10,fffffd805c1a1f90) at pool_p_free+0x1ba sys/kern/subr_pool.c:1012 pool_reclaim(ffffffff834f1d10) at pool_reclaim+0x2a6 sys/kern/subr_pool.c:1151 pool_reclaim_all() at pool_reclaim_all+0x48 kern_sysctl_locked(ffff80002a5af224,1,0,ffff80002a5af258,20001440,4,5542b643c7322394) at kern_sysctl_locked+0x15f9 sys/kern/kern_sysctl.c:728 kern_sysctl(ffff80002a5af224,1,0,ffff80002a5af258,20001440,4,dde1a5747b7dec56) at kern_sysctl+0x9b2 sys/kern/kern_sysctl.c:577 sys_sysctl(ffff800037623460,ffff80002a5af390,ffff80002a5af2e0) at sys_sysctl+0x41f syscall(ffff80002a5af390) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a724d5a2b0, count: -9