uvm_fault(0xfffffd806c213798, 0x7f804e670f00, 0, 2) -> e kernel: page fault trap, code=2 Stopped at pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1) TID PID UID PRFLAGS PFLAGS CPU COMMAND pmap_page_remove(fffffd8007ebcf60) at pmap_page_remove+0x45d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8007ebcf60) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014 uvm_anfree_list(fffffd8064bbfb80,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 amap_wipeout(fffffd80743f8008) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:486 uvm_unmap_detach(ffff80003c5bf300,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806c213798) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000ffff3720,0,0,1) at exit1+0x723 sys/kern/kern_exit.c:260 sys_exit(ffff8000ffff3720,ffff80003c5bf4d0,ffff80003c5bf420) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c5bf4d0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5bf4d0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cfc3f8893b0, 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(0xfffffd806c213798, 0x7f804e670f00, 0, 2) -> e ddb{0}> trace pmap_page_remove(fffffd8007ebcf60) at pmap_page_remove+0x45d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8007ebcf60) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014 uvm_anfree_list(fffffd8064bbfb80,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 amap_wipeout(fffffd80743f8008) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:486 uvm_unmap_detach(ffff80003c5bf300,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806c213798) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000ffff3720,0,0,1) at exit1+0x723 sys/kern/kern_exit.c:260 sys_exit(ffff8000ffff3720,ffff80003c5bf4d0,ffff80003c5bf420) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c5bf4d0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5bf4d0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cfc3f8893b0, count: -9 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c5bf200 rbx 0xfffffd806edeba50 rdx 0 rcx 0x7f8000000000 rax 0 r8 0 r9 0xc7 r10 0x44080ceb3a3f89d0 r11 0x7a69cc34d3af7f0a r12 0 r13 0 r14 0x4e670f00 r15 0xfffffd8007ebcfc8 rip 0xffffffff82a6067d pmap_page_remove+0x45d cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003c5bf180 ss 0x10 pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1) ddb{0}> show proc PROC (syz-executor) tid=299167 pid=29032 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000ffff3720 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffe2a70,0xffff8000ffff39c0 process=0xffff80003c4d2210 user=0xffff80003c5ba000, vmspace=0xfffffd806c213798 estcpu=34, cpticks=6, pctcpu=0.7, user=0, sys=4, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45789 292174 10332 0 2 0 syz-executor 45789 190234 10332 0 2 0x4000000 syz-executor 55980 515305 69532 0 2 0xc80 syz-executor 55980 42673 69532 0 3 0x4000080 kqsel syz-executor 55980 447305 69532 0 3 0x4000080 fsleep syz-executor 37871 388962 25677 0 2 0xc80 syz-executor 37871 471134 25677 0 3 0x4000080 netcon syz-executor 37871 205365 25677 0 3 0x4000080 fsleep syz-executor 65676 120595 20110 -1 2 0xc90 syz-executor 65676 377677 20110 -1 3 0x4000090 nanoslp syz-executor 65676 453212 20110 -1 3 0x4000090 fsleep syz-executor 58107 260881 60509 0 2 0xc80 syz-executor 58107 241508 60509 0 3 0x4000080 netcon syz-executor 58107 2892 60509 0 3 0x4000080 fsleep syz-executor 30887 510881 33794 0 2 0xc80 syz-executor 30887 431190 33794 0 3 0x4000080 kqsel syz-executor 30887 170762 33794 0 3 0x4000080 fsleep syz-executor 10332 522871 503 0 2 0xc82 syz-executor 60250 161860 503 0 3 0x82 wait syz-executor 25677 469150 503 0 2 0xc82 syz-executor 11270 348617 0 0 3 0x14200 acct acct 33794 276903 503 0 2 0xc82 syz-executor 20110 151784 503 0 2 0xc82 syz-executor 60509 474140 503 0 2 0xc82 syz-executor 7244 234116 503 0 2 0xc82 syz-executor 69532 45431 503 0 2 0xc82 syz-executor 3875 254507 1 0 3 0x100083 ttyin getty 67178 79911 0 0 3 0x14200 bored sosplice 503 306482 56473 0 3 0x82 kqread syz-executor 56473 508479 35587 0 3 0x10008a sigsusp ksh 35587 54118 95542 0 3 0x98 kqread sshd-session 95542 468548 25466 0 3 0x92 kqread sshd-session 25466 511380 1 0 3 0x88 kqread sshd 65256 518543 28338 74 3 0x1100092 bpf pflogd 28338 298242 1 0 3 0x80 sbwait pflogd 88184 188320 98283 73 3 0x1100090 kqread syslogd 98283 71662 1 0 3 0x100082 sbwait syslogd 74166 352897 1 0 3 0x100080 kqread resolvd 34169 146255 3962 77 3 0x100092 kqread dhcpleased 89351 450055 3962 77 3 0x100092 kqread dhcpleased 3962 301615 1 0 3 0x80 kqread dhcpleased 27322 478124 0 0 3 0x14200 bored smr 97079 202003 0 0 2 0x14200 zerothread 68955 358330 0 0 3 0x14200 aiodoned aiodoned 30567 464535 0 0 3 0x14200 syncer update 36749 119136 0 0 3 0x14200 cleaner cleaner 25974 345023 0 0 3 0x14200 reaper reaper 11884 109363 0 0 3 0x14200 pgdaemon pagedaemon 25118 422622 0 0 3 0x14200 bored viomb 86534 121183 0 0 3 0x40014200 acpi0 acpi0 63711 438913 0 0 7 0x40014200 idle1 14941 431716 0 0 3 0x14200 bored softnet3 4859 115194 0 0 3 0x14200 bored softnet2 71785 383721 0 0 3 0x14200 bored softnet1 35804 399028 0 0 3 0x14200 bored softnet0 28388 266786 0 0 3 0x14200 bored systqmp 23172 67958 0 0 3 0x14200 bored systq 97088 120768 0 0 3 0x14200 tmoslp softclockmp 25180 195587 0 0 3 0x40014200 tmoslp softclock 94216 132779 0 0 3 0x40014200 idle0 1 262327 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c060210) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 pmap_page_remove+0xcd rcr3 machine/cpufunc.h:139 [inline] #3 pmap_page_remove+0xcd pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_page_remove+0xcd sys/arch/amd64/amd64/pmap.c:1974 #4 uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 #5 amap_wipeout+0x248 sys/uvm/uvm_amap.c:486 #6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #7 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 #8 exit1+0x723 sys/kern/kern_exit.c:260 #9 sys_exit+0x1a sys/kern/kern_exit.c:-1 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 #11 Xsyscall+0x128 Process 45789 (syz-executor) thread 0xffff80002a3099e0 (190234) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10245 11126K 12600K 166960K 23303 0 pcb 18 20K 36K 166960K 1832 0 rtable 284 16K 16K 166960K 1833 0 pf 42 19K 22K 166960K 453 0 ifaddr 45 9K 10K 166960K 352 0 ifgroup 59 2K 2K 166960K 606 0 sysctl 4 1K 9K 166960K 91 0 counters 70 37K 38K 166960K 734 0 ioctlops 0 0K 4K 166960K 3283 0 iov 0 0K 32K 166960K 527 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1459 92K 92K 166960K 8435 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 20K 28K 166960K 155 0 VM map 2 1K 1K 166960K 2 0 sem 28 73K 89K 166960K 129 0 dirhash 12 2K 3K 166960K 174 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 7284 0 sigio 0 0K 0K 166960K 216 0 proc 72 91K 128K 166960K 2134 0 subproc 72 4K 4K 166960K 323 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 1683 0 in_multi 89 6K 7K 166960K 637 0 ether_multi 1 0K 0K 166960K 95 0 mrt 1 0K 0K 166960K 37 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 1861 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 16 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 258 161K 187K 166960K 66489 0 UVM aobj 258 10K 11K 166960K 269 0 pinsyscall 42 84K 102K 166960K 9052 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 422 0 NDP 15 0K 1K 166960K 258 0 temp 84 8684K 8940K 166960K 312896 0 kqueue 13 20K 34K 166960K 1290 0 SYN cache 2 8K 16K 166960K 3 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 120 727 0 723 6 5 1 3 0 8 0 rtentry 176 589 0 480 7 1 6 6 0 8 0 unpcb 144 5356 0 5336 44 38 6 10 0 8 5 syncache 336 13 0 13 4 4 0 1 0 8 0 tcpcb 736 2863 0 2853 63 56 7 10 0 8 6 arp 128 109 0 88 1 0 1 1 0 8 0 inpcb 328 8776 0 8757 86 76 10 16 0 8 8 nd6 144 133 0 109 2 1 1 2 0 8 0 pkpcb 40 118 0 118 13 12 1 1 0 8 1 kcovpl 48 35 0 27 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 2 0 1 0 8 0 ppxss 1192 254 0 254 10 9 1 1 0 8 1 pppxif 1504 29 0 29 12 11 1 1 0 8 1 pfstscr 40 3 0 3 2 2 0 1 0 8 0 pffrag 232 39 0 26 1 0 1 1 0 482 0 pffrnode 88 33 0 21 1 0 1 1 0 8 0 pffrent 40 62 0 49 1 0 1 1 0 8 0 pfosfp 40 1461 0 1037 5 0 5 5 0 8 0 pfosfpen 112 1461 0 746 21 0 21 21 0 8 0 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 482 0 296 2 0 2 2 0 8 0 pfstkey 128 490 0 304 7 0 7 7 0 8 0 pfstate 384 486 0 299 19 0 19 19 0 8 0 pfrule 1344 26 0 17 2 1 1 2 0 8 0 rttmr 136 3 0 3 1 1 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 2057 0 1653 43 17 26 29 0 8 0 art_table 40 2061 0 1653 5 0 5 5 0 8 0 art_node 32 576 0 485 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 2 1 0 1 1 0 8 0 semupl 112 12 0 12 5 5 0 1 0 8 0 semapl 112 113 0 87 1 0 1 1 0 8 0 shmpl 112 266 0 11 8 0 8 8 0 8 0 dirhash 1024 129 0 112 3 0 3 3 0 8 0 dino2pl 256 15467 0 13905 99 0 99 99 0 8 0 ffsino 288 15467 0 13905 113 0 113 113 0 8 0 nchpl 144 25182 0 23410 66 0 66 66 0 8 0 rtmask 32 34 0 34 13 12 1 1 0 8 1 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 92022 0 92021 13 11 2 4 0 8 1 percpumem 16 382 0 332 1 0 1 1 0 8 0 kstatmem 264 378 0 348 4 1 3 3 0 8 0 acpiwqpl 32 4 0 4 1 0 1 1 1 8 1 scsiplug 72 34 0 34 9 9 0 1 0 8 0 scxspl 216 187002 0 187002 21 20 1 8 1 8 1 plimitpl 152 1532 0 1513 1 0 1 1 0 8 0 sigapl 424 7508 0 7456 11 4 7 9 0 8 0 knotepl 120 709 0 0 18 0 18 18 0 8 0 kqueuepl 224 2626 0 2613 26 25 1 5 0 8 0 pipepl 336 1156 0 1127 27 21 6 8 0 8 1 fdescpl 520 7450 0 7419 3 0 3 3 0 8 0 filepl 160 54651 0 54417 75 58 17 27 0 8 4 lockfpl 104 3893 0 3889 8 6 2 3 0 8 1 lockfspl 48 1664 0 1660 1 0 1 1 0 8 0 sessionpl 144 63 0 54 1 0 1 1 0 8 0 pgrppl 48 270 0 253 1 0 1 1 0 8 0 ucredpl 104 9439 0 9425 1 0 1 1 0 8 0 zombiepl 144 8284 0 8282 2 1 1 1 0 8 0 processpl 1240 7508 0 7456 6 0 6 6 0 8 0 procpl 656 18787 0 18724 10 3 7 8 0 8 0 sosppl 168 69 0 69 13 12 1 1 0 8 1 sockpl 728 15359 0 15316 156 143 13 28 0 8 8 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 15 0 0 2 0 2 2 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 39 0 0 5 0 5 5 0 8 0 mtagpl 96 198 0 0 4 0 4 4 0 8 0 mbufpl 256 1397 0 0 81 0 81 81 0 8 0 bufpl 280 80359 0 74217 440 0 440 440 0 8 0 anonpl 32 14888 0 0 120 0 120 120 0 246 0 amapchunkpl 152 231158 0 230551 92 61 31 38 0 158 3 amappl16 200 27552 0 27476 170 145 25 30 0 8 5 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 189 0 177 1 0 1 1 0 8 0 amappl13 176 5 0 5 3 3 0 1 0 8 0 amappl12 168 8541 0 8510 4 2 2 3 0 8 0 amappl11 160 55 0 41 1 0 1 1 0 8 0 amappl10 152 10 0 9 2 1 1 1 0 8 0 amappl9 144 252 0 252 3 3 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 177 0 164 1 0 1 1 0 8 0 amappl6 120 470 0 466 1 0 1 1 0 8 0 amappl5 112 249 0 239 1 0 1 1 0 8 0 amappl4 104 439 0 418 1 0 1 1 0 8 0 amappl3 96 47970 0 47845 4 0 4 4 0 8 0 amappl2 88 1117 0 1050 2 0 2 2 0 8 0 amappl1 80 40194 0 39594 18 2 16 16 0 8 0 amappl 88 63974 0 63790 6 1 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma16384 16384 2 0 2 2 2 0 1 0 8 0 dma8192 8192 2 0 2 2 2 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 128 270 0 270 10 10 0 1 0 8 0 dma64 64 9 0 9 4 4 0 1 0 8 0 dma32 32 9 0 9 3 3 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 268 0 11 5 0 5 5 0 8 0 uaddrrnd 24 7450 0 7419 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7450 0 7419 1 0 1 1 0 8 0 vmmpekpl 168 50338 0 50272 4 0 4 4 0 8 0 vmmpepl 168 466284 0 464143 157 42 115 124 0 357 1 vmsppl 480 7449 0 7418 6 1 5 5 0 8 0 rwobjpl 72 121184 0 113987 148 8 140 141 0 8 0 pdppl 4096 14908 0 14836 150 76 74 86 0 8 2 pvpl 32 25586 0 0 204 0 204 204 0 265 0 pmappl 256 7449 0 7418 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 638 0 194 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace pmap_page_remove(fffffd8007ebcf60) at pmap_page_remove+0x45d _atomic_swap_64 machine/atomic.h:117 [inline] pmap_page_remove(fffffd8007ebcf60) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014 uvm_anfree_list(fffffd8064bbfb80,0) at uvm_anfree_list+0xd6 sys/uvm/uvm_anon.c:112 amap_wipeout(fffffd80743f8008) at amap_wipeout+0x248 sys/uvm/uvm_amap.c:486 uvm_unmap_detach(ffff80003c5bf300,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806c213798) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000ffff3720,0,0,1) at exit1+0x723 sys/kern/kern_exit.c:260 sys_exit(ffff8000ffff3720,ffff80003c5bf4d0,ffff80003c5bf420) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c5bf4d0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c5bf4d0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cfc3f8893b0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu_x86.c:1218 sched_idle(ffff8000299ddff0) at sched_idle+0x4d8 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu_x86.c:1218 sched_idle(ffff8000299ddff0) at sched_idle+0x4d8 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5