panic: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 144 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *177502 90946 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834125e3) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452871,ffffffff83439e03,90,ffffffff833ecf93) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8006c0a480,fffffd806d1c01c8,5079b8000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806d1c01c8,5079b8000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806d1c01b8,a0f37110000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806d1c01b8,a0f37110000,79f8c000,1,20) at pmap_enter+0x3a3 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_upper_lookup(ffff80003b4eae60,ffff80003b4eae98,ffff80003b4ead60,ffff80003b4eade0) at uvm_fault_upper_lookup+0x301 sys/uvm/uvm_fault.c:-1 uvm_fault(fffffd806cd092f0,a0f3710f000,0,1) at uvm_fault+0x139 sys/uvm/uvm_fault.c:632 upageflttrap(ffff80003b4eb000,a0f3710f368) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003b4eb000) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x72a13a9a9150, count: 3 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: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 144 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834125e3) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452871,ffffffff83439e03,90,ffffffff833ecf93) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8006c0a480,fffffd806d1c01c8,5079b8000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806d1c01c8,5079b8000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806d1c01b8,a0f37110000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806d1c01b8,a0f37110000,79f8c000,1,20) at pmap_enter+0x3a3 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_upper_lookup(ffff80003b4eae60,ffff80003b4eae98,ffff80003b4ead60,ffff80003b4eade0) at uvm_fault_upper_lookup+0x301 sys/uvm/uvm_fault.c:-1 uvm_fault(fffffd806cd092f0,a0f3710f000,0,1) at uvm_fault+0x139 sys/uvm/uvm_fault.c:632 upageflttrap(ffff80003b4eb000,a0f3710f368) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003b4eb000) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x72a13a9a9150, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003b4ea970 rbx 0xfffffd8006c0a401 rdx 0 rcx 0 rax 0xffff80002a81cd28 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8ba5e0850d071afc r11 0x3efa55bd4ab7dcf7 r12 0 r13 0x5079b8000 r14 0 r15 0x1 rip 0xffffffff82154895 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003b4ea960 ss 0 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=177502 pid=90946 tcnt=2 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002f8c0fa8,0xffff80002a81d500 process=0xffff8000ffff8d98 user=0xffff80003b4e6000, vmspace=0xfffffd806cd092f0 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 10921 367100 99625 0 3 0x80 nanoslp syz-executor 10921 267984 99625 0 3 0x4000080 fsleep syz-executor 10921 483231 99625 0 3 0x4000080 fsleep syz-executor 21411 356598 77571 0 2 0 syz-executor 21411 5852 77571 0 3 0x4000080 fifor syz-executor *90946 177502 90400 0 7 0 syz-executor 90946 310926 90400 0 3 0x4000080 fsleep syz-executor 23386 477950 2852 0 3 0x80 nanoslp syz-executor 23386 294412 2852 0 3 0x4000080 netcon syz-executor 23386 443325 2852 0 3 0x4000080 fsleep syz-executor 21497 179490 60300 0 3 0x80 nanoslp syz-executor 21497 202832 60300 0 3 0x4000080 sbwait syz-executor 21497 108317 60300 0 3 0x4000080 fsleep syz-executor 47552 148240 1 0 3 0x100083 ttyin getty 20193 131710 0 0 3 0x14280 nfsidl nfsio 2339 292913 0 0 3 0x14280 nfsidl nfsio 54959 113056 0 0 3 0x14280 nfsidl nfsio 29267 104609 0 0 3 0x14280 nfsidl nfsio 65188 257447 0 0 3 0x14280 nfsidl nfsio 6833 411503 0 0 3 0x14280 nfsidl nfsio 42061 251910 0 0 3 0x14280 nfsidl nfsio 86324 43215 0 0 3 0x14280 nfsidl nfsio 43735 120367 0 0 3 0x14280 nfsidl nfsio 24493 46629 0 0 3 0x14280 nfsidl nfsio 66370 313652 0 0 3 0x14280 nfsidl nfsio 49377 214239 0 0 3 0x14280 nfsidl nfsio 62084 146814 0 0 3 0x14280 nfsidl nfsio 62126 35024 0 0 3 0x14280 nfsidl nfsio 98270 59195 0 0 3 0x14280 nfsidl nfsio 84436 370452 0 0 3 0x14280 nfsidl nfsio 28785 442625 0 0 3 0x14280 nfsidl nfsio 56265 360567 0 0 3 0x14280 nfsidl nfsio 40625 498440 0 0 3 0x14280 nfsidl nfsio 57030 377905 0 0 3 0x14280 nfsidl nfsio 77571 509075 19836 0 3 0x82 nanoslp syz-executor 90400 416248 19836 0 3 0x82 nanoslp syz-executor 29088 30353 19836 0 3 0x82 wait syz-executor 2852 192889 19836 0 3 0x82 nanoslp syz-executor 25340 411158 19836 0 3 0x2 biowait syz-executor 99625 198892 19836 0 3 0x82 nanoslp syz-executor 60300 504115 19836 0 3 0x82 nanoslp syz-executor 8541 520733 19836 0 3 0x82 nanoslp syz-executor 19836 296770 80605 0 3 0x82 kqread syz-executor 80605 199394 76289 0 3 0x10008a sigsusp ksh 76289 348063 10314 0 3 0x98 kqread sshd-session 10314 105131 53620 0 3 0x92 kqread sshd-session 53620 185736 1 0 3 0x88 kqread sshd 90191 276097 53711 73 3 0x1100090 kqread syslogd 53711 493132 1 0 3 0x100082 sbwait syslogd 4949 317042 1 0 3 0x100080 kqread resolvd 17720 514363 87928 77 3 0x100092 kqread dhcpleased 7908 114363 87928 77 3 0x100092 kqread dhcpleased 87928 426838 1 0 3 0x80 kqread dhcpleased 74395 491533 0 0 3 0x14200 bored smr 51518 278685 0 0 2 0x14200 zerothread 55962 158392 0 0 3 0x14200 aiodoned aiodoned 8591 422690 0 0 3 0x14200 syncer update 66682 63234 0 0 3 0x14200 cleaner cleaner 91157 311388 0 0 3 0x14200 reaper reaper 35826 367311 0 0 3 0x14200 pgdaemon pagedaemon 29151 11107 0 0 3 0x14200 bored viomb 91325 141087 0 0 3 0x40014200 acpi0 acpi0 51891 409644 0 0 2 0x14200 softnet0 53915 190618 0 0 3 0x14200 bored systqmp 24995 310917 0 0 3 0x14200 bored systq 33249 10590 0 0 3 0x40014200 tmoslp softclock 57104 23463 0 0 3 0x40014200 idle0 1 216559 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 11041 12107K 12667K 166960K 13632 0 pcb 17 16K 18K 166960K 303 0 rtable 166 15K 15K 166960K 574 0 pf 28 12K 13K 166960K 98 0 ifaddr 27 4K 7K 166960K 87 0 ifgroup 46 2K 2K 166960K 132 0 sysctl 4 1K 9K 166960K 17 0 counters 32 17K 18K 166960K 79 0 ioctlops 0 0K 4K 166960K 196 0 iov 0 0K 16K 166960K 43 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1377 86K 87K 166960K 2391 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 15 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 64 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 77K 166960K 957 0 sigio 1 0K 0K 166960K 30 0 proc 61 59K 83K 166960K 599 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 109 0 in_multi 51 3K 7K 166960K 148 0 ether_multi 1 0K 0K 166960K 10 0 mrt 1 0K 0K 166960K 27 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 531 0 fusefs mount 1 32K 32K 166960K 1 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 233 151K 169K 166960K 10210 0 UVM aobj 26 4K 6K 166960K 30 0 pinsyscall 38 76K 87K 166960K 2078 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 86 0 NDP 10 0K 2K 166960K 58 0 temp 77 9076K 9146K 166960K 31409 0 kqueue 13 20K 30K 166960K 186 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 120 138 0 135 2 0 2 2 0 8 1 rtentry 136 146 0 87 4 0 4 4 0 8 0 unpcb 144 1040 0 1018 6 0 6 6 0 8 5 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 313 0 307 7 0 7 7 0 8 6 arp 96 21 0 10 1 0 1 1 0 8 0 ipq 40 7 0 1 1 0 1 1 0 8 0 ipqe 40 9 0 3 1 0 1 1 0 8 0 inpcb 328 1164 0 1149 10 0 10 10 0 8 8 ip6q 72 5 0 1 1 0 1 1 0 8 0 ip6af 40 8 0 3 1 0 1 1 0 8 0 nd6 112 36 0 18 1 0 1 1 0 8 0 pkpcb 40 8 0 8 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1072 36 0 36 1 0 1 1 0 8 1 pppxif 1384 3 0 3 1 0 1 1 0 8 1 pfqueue 320 1 0 1 1 0 1 1 0 8 1 pfrule 1360 3 0 2 1 0 1 1 0 8 0 rttmr 136 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 685 0 442 30 0 30 30 0 8 8 art_table 40 687 0 442 5 0 5 5 0 8 0 art_node 32 145 0 92 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 5 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 53 0 43 1 0 1 1 0 8 0 shmpl 112 25 0 3 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 3263 0 1818 92 0 92 92 0 8 0 ffsino 256 3263 0 1818 92 0 92 92 0 8 0 nchpl 144 4602 0 2908 64 0 64 64 0 8 0 rtmask 32 7 0 7 1 0 1 1 0 8 1 vnodes 216 3895 0 0 217 0 217 217 0 8 0 namei 1024 16370 0 16370 2 0 2 2 0 8 2 vcpupl 3904 2 0 1 1 0 1 1 0 8 0 vmpool 808 2 0 1 1 0 1 1 0 8 0 kstatmem 264 80 0 60 2 0 2 2 0 8 0 scsiplug 72 6 0 6 1 0 1 1 0 8 1 scxspl 216 20419 0 20418 8 0 8 8 1 8 7 plimitpl 152 202 0 186 1 0 1 1 0 8 0 sigapl 424 1269 0 1207 8 0 8 8 0 8 0 knotepl 120 35528 0 35481 30 20 10 25 0 8 8 kqueuepl 184 371 0 361 4 0 4 4 0 8 3 pipepl 304 220 0 193 3 0 3 3 0 8 0 fdescpl 448 1235 0 1206 4 0 4 4 0 8 0 filepl 120 9040 0 8818 13 0 13 13 0 8 5 lockfpl 104 629 0 626 2 0 2 2 0 8 1 lockfspl 48 244 0 241 1 0 1 1 0 8 0 sessionpl 144 24 0 16 1 0 1 1 0 8 0 pgrppl 48 40 0 24 1 0 1 1 0 8 0 ucredpl 104 1487 0 1476 1 0 1 1 0 8 0 zombiepl 144 1209 0 1207 1 0 1 1 0 8 0 processpl 1152 1269 0 1207 5 0 5 5 0 8 0 procpl 664 2500 0 2430 7 0 7 7 0 8 0 sosppl 176 9 0 9 1 0 1 1 0 8 1 sockpl 552 2413 0 2373 13 1 12 12 0 8 8 mcl64k 65536 55 0 54 1 0 1 1 0 8 0 mcl16k 16384 4 0 4 1 0 1 1 0 8 1 mcl12k 12288 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 16 0 15 1 0 1 1 0 8 0 mcl4k 4096 3532 0 3477 13 0 13 13 0 8 5 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 1008 0 1001 4 0 4 4 0 8 3 mtagpl 96 20 0 11 1 0 1 1 0 8 0 mbufpl 256 111962 0 111796 415 392 23 412 0 8 8 bufpl 280 8237 0 2023 445 0 445 445 0 8 0 anonpl 24 218571 0 215387 59 0 59 59 0 187 22 amapchunkpl 152 35847 0 35339 40 0 40 40 0 158 19 amappl16 200 4483 0 4451 30 18 12 19 0 8 8 amappl15 192 7 0 7 1 0 1 1 0 8 1 amappl14 184 422 0 420 1 0 1 1 0 8 0 amappl13 176 132 0 122 1 0 1 1 0 8 0 amappl12 168 1475 0 1447 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 0 1 1 0 8 1 amappl10 152 61 0 51 1 0 1 1 0 8 0 amappl9 144 253 0 253 1 0 1 1 0 8 1 amappl8 136 103 0 102 1 0 1 1 0 8 0 amappl7 128 146 0 135 1 0 1 1 0 8 0 amappl6 120 162 0 161 1 0 1 1 0 8 0 amappl5 112 92 0 85 1 0 1 1 0 8 0 amappl4 104 269 0 253 1 0 1 1 0 8 0 amappl3 96 6736 0 6621 4 0 4 4 0 8 1 amappl2 88 543 0 490 2 0 2 2 0 8 0 amappl1 80 12843 0 12291 15 0 15 15 0 8 2 amappl 88 9358 0 9187 5 0 5 5 0 92 1 uvmvnodes 80 133 0 0 3 0 3 3 0 8 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 128 256 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 29 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1235 0 1206 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1235 0 1206 1 0 1 1 0 8 0 vmmpekpl 168 10995 0 10957 2 0 2 2 0 8 0 vmmpepl 168 84125 0 82324 95 0 95 95 0 357 14 vmsppl 368 1234 0 1206 3 0 3 3 0 8 0 rwobjpl 40 24619 0 23597 14 0 14 14 0 8 0 pdppl 4096 2480 0 2415 91 24 67 72 0 8 2 pvpl 32 581566 0 572863 136 0 136 136 0 265 44 pmappl 216 1236 0 1207 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 769 0 416 21 0 21 21 0 8 7 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834125e3) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452871,ffffffff83439e03,90,ffffffff833ecf93) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8006c0a480,fffffd806d1c01c8,5079b8000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806d1c01c8,5079b8000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806d1c01b8,a0f37110000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806d1c01b8,a0f37110000,79f8c000,1,20) at pmap_enter+0x3a3 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_upper_lookup(ffff80003b4eae60,ffff80003b4eae98,ffff80003b4ead60,ffff80003b4eade0) at uvm_fault_upper_lookup+0x301 sys/uvm/uvm_fault.c:-1 uvm_fault(fffffd806cd092f0,a0f3710f000,0,1) at uvm_fault+0x139 sys/uvm/uvm_fault.c:632 upageflttrap(ffff80003b4eb000,a0f3710f368) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003b4eb000) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x72a13a9a9150, count: -12 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834125e3) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452871,ffffffff83439e03,90,ffffffff833ecf93) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8006c0a480,fffffd806d1c01c8,5079b8000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806d1c01c8,5079b8000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806d1c01b8,a0f37110000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806d1c01b8,a0f37110000,79f8c000,1,20) at pmap_enter+0x3a3 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_upper_lookup(ffff80003b4eae60,ffff80003b4eae98,ffff80003b4ead60,ffff80003b4eade0) at uvm_fault_upper_lookup+0x301 sys/uvm/uvm_fault.c:-1 uvm_fault(fffffd806cd092f0,a0f3710f000,0,1) at uvm_fault+0x139 sys/uvm/uvm_fault.c:632 upageflttrap(ffff80003b4eb000,a0f3710f368) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003b4eb000) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x72a13a9a9150, count: -12