uvm_fault(0xffffffff82e55648, 0x0, 0, 2) -> e kernel: page fault trap, code=2 Stopped at km_free+0x128: movq $0,0(%rax) TID PID UID PRFLAGS PFLAGS CPU COMMAND 126401 64187 0 0x8000000 0 0 syz-executor.1 *475166 92525 0 0x14000 0x200 1 systqmp km_free(0,1000,ffffffff82be0400,ffffffff82be0418) at km_free+0x128 sys/uvm/uvm_km.c:870 pool_p_free(ffffffff82d9df80,fffffd8065912f90) at pool_p_free+0x14d sys/kern/subr_pool.c:1012 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82c92bf0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: 11 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xffffffff82e55648, 0x0, 0, 2) -> e ddb{1}> trace km_free(0,1000,ffffffff82be0400,ffffffff82be0418) at km_free+0x128 sys/uvm/uvm_km.c:870 pool_p_free(ffffffff82d9df80,fffffd8065912f90) at pool_p_free+0x14d sys/kern/subr_pool.c:1012 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82c92bf0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0x1000 __ALIGN_SIZE rsi 0x28000000 rbp 0xffff80002a11da70 rbx 0xffffffff82be0400 kv_page rdx 0 rcx 0xffff8000ffffe290 rax 0 r8 0 r9 0x1 r10 0xe550c6edd8180d3a r11 0xba07211fca1ee8e8 r12 0x1000 __ALIGN_SIZE r13 0 r14 0x1000 __ALIGN_SIZE r15 0x28000000000 rip 0xffffffff82321a38 km_free+0x128 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a11da00 ss 0x10 km_free+0x128: movq $0,0(%rax) ddb{1}> show proc PROC (systqmp) tid=475166 pid=92525 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff8000ffffe000,0xffff8000ffffe530 process=0xffff80002a0fdf10 user=0xffff80002a118000, vmspace=0xffffffff82e55648 estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51770 4844 41872 0 2 0x8000000 syz-executor.5 51770 301774 41872 0 2 0xc000000 syz-executor.5 21279 93903 87874 0 2 0x8000000 syz-executor.0 21279 93699 87874 0 3 0xc000080 fsleep syz-executor.0 21279 269005 87874 0 2 0xc000000 syz-executor.0 19079 459067 72478 0 2 0x8000000 syz-executor.3 19079 343529 72478 0 2 0xc000000 syz-executor.3 18826 29335 11265 0 2 0x8000000 syz-executor.2 18826 232398 11265 0 3 0xc000080 fsleep syz-executor.2 18826 206601 11265 0 2 0xc000000 syz-executor.2 64187 126401 76364 0 7 0x8000000 syz-executor.1 64187 181045 76364 0 3 0xc000080 fsleep syz-executor.1 39069 120149 34113 0 2 0x8000000 syz-executor.6 39069 343629 34113 0 3 0xc000080 fsleep syz-executor.6 39069 367026 34113 0 2 0xc000000 syz-executor.6 76364 168329 54611 0 2 0x8000482 syz-executor.1 22625 434424 98926 0 2 0x8082000 syz-executor.7 22625 317831 98926 0 4 0xc082000 syz-executor.7 22625 252330 98926 0 3 0xc002000 suspend syz-executor.7 87874 214699 54611 0 2 0x8000482 syz-executor.0 11265 122340 54611 0 2 0x8000482 syz-executor.2 41872 348021 54611 0 2 0x8000002 syz-executor.5 99769 4011 1 0 3 0x18100083 ttyin getty 34113 143141 54611 0 2 0x8000482 syz-executor.6 98926 189987 54611 0 3 0x8000082 wait syz-executor.7 72478 211527 54611 0 2 0x8000482 syz-executor.3 23846 483167 0 0 3 0x14200 bored sosplice 60032 382506 54611 0 2 0x8000482 syz-executor.4 54611 297846 42396 0 3 0x1a000082 wait syz-fuzzer 54611 349577 42396 0 2 0x1e000482 syz-fuzzer 54611 255625 42396 0 3 0x1e000082 wait syz-fuzzer 54611 512624 42396 0 3 0x1e000082 wait syz-fuzzer 54611 104641 42396 0 2 0x1e000482 syz-fuzzer 54611 524047 42396 0 3 0x1e000082 thrsleep syz-fuzzer 54611 215245 42396 0 3 0x1e000082 thrsleep syz-fuzzer 54611 348674 42396 0 3 0x1e000082 wait syz-fuzzer 54611 348249 42396 0 3 0x1e000082 thrsleep syz-fuzzer 54611 380932 42396 0 3 0x1e000082 thrsleep syz-fuzzer 54611 420021 42396 0 3 0x1e000082 thrsleep syz-fuzzer 54611 265198 42396 0 3 0x1e000082 wait syz-fuzzer 54611 377098 42396 0 3 0x1e000082 thrsleep syz-fuzzer 54611 203272 42396 0 3 0x1e000082 wait syz-fuzzer 54611 69920 42396 0 3 0x1e000082 wait syz-fuzzer 54611 151925 42396 0 3 0x1e000082 wait syz-fuzzer 42396 316522 49324 0 3 0x810008a sigsusp ksh 49324 439076 21182 0 3 0x1800009a kqread sshd 21182 15100 1 0 3 0x18000088 kqread sshd 49898 137461 85316 74 3 0x19100092 bpf pflogd 85316 412643 1 0 3 0x18000080 sbwait pflogd 77053 513577 58701 73 3 0x19100010 biowait syslogd 58701 86736 1 0 3 0x18100082 sbwait syslogd 62636 255003 1 0 3 0x18100080 kqread resolvd 4299 491290 61607 77 3 0x18100092 kqread dhcpleased 83055 178533 61607 77 3 0x18100092 kqread dhcpleased 61607 465853 1 0 3 0x18000080 kqread dhcpleased 75523 268784 0 0 3 0x14200 bored smr 97470 100654 0 0 2 0x14200 zerothread 15703 229336 0 0 3 0x14200 aiodoned aiodoned 8112 486631 0 0 2 0x14600 update 10059 387470 0 0 3 0x14200 cleaner cleaner 61170 19569 0 0 3 0x14200 reaper reaper 83275 97116 0 0 3 0x14200 pgdaemon pagedaemon 5178 141225 0 0 3 0x14200 bored viomb 499 246585 0 0 3 0x40014200 acpi0 acpi0 17643 248106 0 0 3 0x40014200 idle1 95312 297841 0 0 3 0x14200 bored softnet3 83326 390252 0 0 3 0x14200 bored softnet2 59049 175167 0 0 3 0x14200 bored softnet1 96429 346232 0 0 3 0x14200 bored softnet0 *92525 475166 0 0 7 0x14200 systqmp 51382 75673 0 0 3 0x14200 bored systq 26635 169443 0 0 3 0x14200 tmoslp softclockmp 74875 427168 0 0 3 0x40014200 tmoslp softclock 97617 58753 0 0 3 0x40014200 idle0 1 350492 0 0 3 0x8080082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 18826 (syz-executor.2) thread 0xffff80002a259218 (232398) Process 77053 (syslogd) thread 0xffff8000ffffdc40 (513577) Process 92525 (systqmp) thread 0xffff8000ffffe290 (475166) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10188 6498K 6923K 166960K 12492 0 pcb 15 10K 10K 166960K 237 0 rtable 186 6K 7K 166960K 888 0 pf 28 8K 10K 166960K 113 0 ifaddr 36 14K 16K 166960K 126 0 ifgroup 47 2K 2K 166960K 177 0 sysctl 3 0K 0K 166960K 7 0 counters 60 35K 36K 166960K 124 0 ioctlops 0 0K 4K 166960K 1564 0 iov 0 0K 18K 166960K 179 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1483 93K 94K 166960K 2394 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 60 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 158 0 dirhash 12 2K 3K 166960K 54 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 17 61K 85K 166960K 2008 0 sigio 0 0K 0K 166960K 64 0 proc 70 91K 115K 166960K 1077 0 subproc 104 6K 6K 166960K 273 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 230 0 in_multi 66 4K 7K 166960K 314 0 ether_multi 1 0K 0K 166960K 11 0 mrt 1 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 734 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 361 135K 135K 166960K 19791 0 UVM aobj 98 5K 5K 166960K 114 0 pinsyscall 41 82K 108K 166960K 3554 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 223 0 NDP 10 0K 2K 166960K 85 0 temp 74 6812K 6938K 166960K 31753 0 kqueue 12 18K 36K 166960K 283 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 120 192 0 188 1 0 1 1 0 8 0 rtentry 112 295 0 212 4 1 3 4 0 8 0 unpcb 144 1344 0 1327 6 4 2 2 0 8 1 syncache 336 41 0 41 8 7 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 283 0 283 9 8 1 1 0 8 1 tcpcb 808 745 0 724 7 4 3 6 0 8 0 arp 120 55 0 42 1 0 1 1 0 8 0 inpcb 392 2042 0 2018 11 7 4 7 0 8 0 nd6 136 69 0 52 1 0 1 1 0 8 0 pkpcb 40 9 0 9 6 6 0 1 0 8 0 kcovpl 48 21 0 13 1 0 1 1 0 8 0 ppxss 1168 5 0 5 2 2 0 1 0 8 0 pffrag 232 13 0 10 1 0 1 1 0 482 0 pffrnode 88 9 0 6 1 0 1 1 0 8 0 pffrent 40 148 0 145 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 24 148 0 112 1 0 1 1 0 8 0 pfstkey 128 148 0 112 2 0 2 2 0 8 0 pfstate 376 148 0 112 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1092 0 760 36 12 24 29 0 8 2 art_table 32 1093 0 760 4 0 4 4 0 8 0 art_node 16 290 0 217 1 0 1 1 0 8 0 sysvmsgpl 40 19 0 12 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 155 0 145 1 0 1 1 0 8 0 shmpl 112 111 0 16 3 0 3 3 0 8 0 dirhash 1024 45 0 28 3 0 3 3 0 8 0 dino2pl 256 4408 0 2890 96 0 96 96 0 8 0 ffsino 272 4408 0 2890 102 0 102 102 0 8 0 nchpl 144 7360 0 5615 67 0 67 67 0 8 0 uvmvnodes 80 5171 0 0 106 0 106 106 0 8 0 vnodes 216 5171 0 0 288 0 288 288 0 8 0 namei 1024 24138 0 24138 3 2 1 2 0 8 1 percpumem 16 76 0 32 1 0 1 1 0 8 0 vcpupl 2048 9 0 2 1 0 1 1 0 8 0 vmpool 696 22 0 15 1 0 1 1 0 8 0 kstatmem 264 84 0 64 2 0 2 2 0 8 0 scxspl 216 31335 0 31334 18 17 1 8 1 8 0 plimitpl 152 329 0 313 1 0 1 1 0 8 0 sigapl 424 2328 0 2278 10 4 6 8 0 8 0 futexpl 64 25727 0 25723 1 0 1 1 0 8 0 knotepl 120 380 0 0 11 0 11 11 0 8 0 kqueuepl 216 439 0 429 2 1 1 2 0 8 0 pipepl 320 355 0 327 4 1 3 3 0 8 0 fdescpl 496 2285 0 2255 9 4 5 5 0 8 1 filepl 152 12298 0 12048 17 6 11 14 0 8 0 lockfpl 104 416 0 414 1 0 1 1 0 8 0 lockfspl 48 180 0 178 1 0 1 1 0 8 0 sessionpl 144 41 0 24 1 0 1 1 0 8 0 pgrppl 48 63 0 46 1 0 1 1 0 8 0 ucredpl 104 1957 0 1944 1 0 1 1 0 8 0 zombiepl 144 2279 0 2278 2 1 1 1 0 8 0 processpl 1136 2328 0 2278 5 1 4 5 0 8 0 procpl 656 4534 0 4458 10 3 7 8 0 8 0 srpgc 96 30 0 30 8 7 1 1 0 8 1 sosppl 168 45 0 43 2 1 1 1 0 8 0 sockpl 584 3615 0 3570 10 5 5 6 0 8 1 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 14 0 0 2 0 2 2 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 16 0 0 2 0 2 2 0 8 0 mcl4k 4096 22 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 373 0 0 47 0 47 47 0 8 0 mtagpl 96 14 0 0 1 0 1 1 0 8 0 mbufpl 256 1046 0 0 61 0 61 61 0 8 0 bufpl 280 9036 0 2781 447 0 447 447 0 8 0 anonpl 24 347381 0 341426 124 67 57 67 0 186 8 amapchunkpl 152 62137 0 61419 69 39 30 39 0 158 0 amappl16 200 7619 0 7503 55 41 14 20 0 8 4 amappl15 192 17 0 17 2 2 0 1 0 8 0 amappl14 184 217 0 203 2 1 1 2 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 3194 0 3157 4 2 2 3 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 98 0 85 2 1 1 1 0 8 0 amappl9 144 203 0 202 3 2 1 1 0 8 0 amappl8 136 400 0 295 4 0 4 4 0 8 0 amappl7 128 68 0 55 1 0 1 1 0 8 0 amappl6 120 589 0 568 2 1 1 2 0 8 0 amappl5 112 282 0 266 1 0 1 1 0 8 0 amappl4 104 718 0 676 3 1 2 3 0 8 0 amappl3 96 12482 0 12389 3 0 3 3 0 8 0 amappl2 88 2812 0 2732 4 2 2 4 0 8 0 amappl1 80 17505 0 16949 26 13 13 23 0 8 0 amappl 88 18931 0 18711 6 0 6 6 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 72 113 0 16 2 0 2 2 0 8 0 uaddrrnd 24 2307 0 2270 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2307 0 2270 1 0 1 1 0 8 0 vmmpekpl 168 19327 0 19270 5 1 4 4 0 8 0 vmmpepl 168 157124 0 154994 165 57 108 121 0 357 3 vmsppl 440 2306 0 2270 7 2 5 5 0 8 0 rwobjpl 56 47539 0 41021 100 7 93 93 0 8 0 pdppl 4096 4621 0 4547 250 172 78 79 0 8 4 pvpl 32 48933 0 0 396 1 395 395 0 265 0 pmappl 248 2306 0 2270 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 640 0 206 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82d40ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82dba758) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82dba758) at __mp_lock+0x129 sys/kern/kern_lock.c:147 intr_handler(ffff80002a218370,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:539 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff82dba758) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82dba758) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd807f0046e0,20c46347000,0,1) at uvm_fault+0x189 sys/uvm/uvm_fault.c:622 upageflttrap(ffff80002a2186f0,20c46347000) at upageflttrap+0x8b sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002a2186f0) at usertrap+0x227 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7d45cd099650, count: 4 ddb{0}> trace x86_ipi_db(ffffffff82d40ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82dba758) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82dba758) at __mp_lock+0x129 sys/kern/kern_lock.c:147 intr_handler(ffff80002a218370,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:539 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff82dba758) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82dba758) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd807f0046e0,20c46347000,0,1) at uvm_fault+0x189 sys/uvm/uvm_fault.c:622 upageflttrap(ffff80002a2186f0,20c46347000) at upageflttrap+0x8b sys/arch/amd64/amd64/trap.c:188 usertrap(ffff80002a2186f0) at usertrap+0x227 sys/arch/amd64/amd64/trap.c:436 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7d45cd099650, count: -11 ddb{0}> machine ddbcpu 1 Stopped at km_free+0x128: movq $0,0(%rax) km_free(0,1000,ffffffff82be0400,ffffffff82be0418) at km_free+0x128 sys/uvm/uvm_km.c:870 pool_p_free(ffffffff82d9df80,fffffd8065912f90) at pool_p_free+0x14d sys/kern/subr_pool.c:1012 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82c92bf0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: 11 ddb{1}> trace km_free(0,1000,ffffffff82be0400,ffffffff82be0418) at km_free+0x128 sys/uvm/uvm_km.c:870 pool_p_free(ffffffff82d9df80,fffffd8065912f90) at pool_p_free+0x14d sys/kern/subr_pool.c:1012 pool_gc_pages(0) at pool_gc_pages+0x255 sys/kern/subr_pool.c:1583 taskq_thread(ffffffff82c92bf0) at taskq_thread+0xe5 sys/kern/kern_task.c:450 end trace frame: 0x0, count: -4