login: 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 * 91663 14824 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8340c772) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8344cdf7,ffffffff83438908,90,ffffffff833ebab7) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8006c6d700,fffffd806d116528,4b816b000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806d116528,4b816b000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806d116518,9702d686000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806d116518,9702d686000,6d1b5000,4,20) at pmap_enter+0x3a3 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower_lookup(ffff800034cedca0,ffff800034cedcd8,ffff800034cedc20) at uvm_fault_lower_lookup+0x328 sys/uvm/uvm_fault.c:-1 uvm_fault_lower(ffff800034cedca0,ffff800034cedcd8,ffff800034cedc20) at uvm_fault_lower+0x85 sys/uvm/uvm_fault.c:1334 uvm_fault(fffffd800c0815d8,9702d689000,0,4) at uvm_fault+0x241 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800034cede40,9702d689e7b) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800034cede40) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x738faf545990, count: 2 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(ffffffff8340c772) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8344cdf7,ffffffff83438908,90,ffffffff833ebab7) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8006c6d700,fffffd806d116528,4b816b000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806d116528,4b816b000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806d116518,9702d686000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806d116518,9702d686000,6d1b5000,4,20) at pmap_enter+0x3a3 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower_lookup(ffff800034cedca0,ffff800034cedcd8,ffff800034cedc20) at uvm_fault_lower_lookup+0x328 sys/uvm/uvm_fault.c:-1 uvm_fault_lower(ffff800034cedca0,ffff800034cedcd8,ffff800034cedc20) at uvm_fault_lower+0x85 sys/uvm/uvm_fault.c:1334 uvm_fault(fffffd800c0815d8,9702d689000,0,4) at uvm_fault+0x241 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800034cede40,9702d689e7b) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800034cede40) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x738faf545990, count: -13 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800034ced720 rbx 0xfffffd8006c6d701 rdx 0 rcx 0 rax 0xffff80003c921248 r8 0x101010101010101 r9 0x8080808080808080 r10 0x89ee4132f58f45a5 r11 0xe525564bab1e2a69 r12 0 r13 0x4b816b000 r14 0 r15 0x1 rip 0xffffffff82289575 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800034ced710 ss 0 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=91663 pid=14824 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c921a10,0xffff80003c920560 process=0xffff800034ce4d98 user=0xffff800034ce8000, vmspace=0xfffffd800c0815d8 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *14824 91663 21678 0 7 0 syz-executor 14824 118182 21678 0 3 0x4000080 fsleep syz-executor 19433 218536 74371 0 2 0 syz-executor 19433 82810 74371 0 3 0x4000080 fsleep syz-executor 19433 422476 74371 0 3 0x4000080 fsleep syz-executor 33032 250006 97908 0 3 0x80 nanoslp syz-executor 33032 348758 97908 0 3 0x4000080 kqread syz-executor 33032 31407 97908 0 3 0x4000080 fsleep syz-executor 78332 442709 71226 0 3 0x80 nanoslp syz-executor 78332 375726 71226 0 3 0x4000080 kqpoll syz-executor 78332 472967 71226 0 3 0x4000080 lockf syz-executor 78332 156815 71226 0 3 0x4000080 fsleep syz-executor 74029 186778 0 0 3 0x14200 acct acct 63440 22245 1 0 3 0x100083 ttyin getty 62599 335126 276 0 3 0x82 nanoslp syz-executor 86094 16432 58210 0 3 0x100082 sbwait ndp 58210 62045 25139 0 3 0x10008a sigsusp sh 71226 494225 276 0 3 0x3 getblk syz-executor 74371 271146 276 0 3 0x82 nanoslp syz-executor 21678 458376 276 0 3 0x82 nanoslp syz-executor 97908 419234 276 0 3 0x3 inode syz-executor 25139 154312 276 0 3 0x82 wait syz-executor 8536 132781 276 0 3 0x82 nanoslp syz-executor 43224 271268 276 0 3 0x82 wait syz-executor 276 183593 66073 0 2 0x2 syz-executor 66073 339878 19774 0 3 0x10008a sigsusp ksh 19774 515203 38519 0 3 0x98 kqread sshd-session 38519 510417 78442 0 3 0x92 kqread sshd-session 78442 286434 1 0 3 0x88 kqread sshd 28050 254629 79496 73 3 0x1100090 kqread syslogd 79496 271177 1 0 3 0x100082 sbwait syslogd 38038 440709 1 0 3 0x100080 kqread resolvd 5843 296670 8974 77 3 0x100092 kqread dhcpleased 11945 150774 8974 77 3 0x100092 kqread dhcpleased 8974 78875 1 0 3 0x80 kqread dhcpleased 94444 116484 0 0 3 0x14200 bored smr 28461 69310 0 0 2 0x14200 zerothread 18342 520023 0 0 3 0x14200 aiodoned aiodoned 53832 399607 0 0 3 0x14200 syncer update 96140 33989 0 0 3 0x14200 cleaner cleaner 28644 254006 0 0 3 0x14200 reaper reaper 18017 73992 0 0 3 0x14200 pgdaemon pagedaemon 46965 192782 0 0 3 0x14200 bored viomb 55627 450448 0 0 3 0x40014200 acpi0 acpi0 11156 339608 0 0 3 0x14200 bored softnet0 34486 57789 0 0 3 0x14200 smrbar systqmp 48644 7659 0 0 3 0x14200 bored systq 18345 400561 0 0 3 0x40014200 tmoslp softclock 64642 319237 0 0 3 0x40014200 idle0 1 243966 0 0 3 0x82 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 11052 12120K 12605K 166960K 12943 0 pcb 17 13K 13K 166960K 162 0 rtable 246 11K 12K 166960K 541 0 pf 40 15K 18K 166960K 123 0 ifaddr 43 8K 8K 166960K 78 0 ifgroup 53 2K 2K 166960K 113 0 sysctl 3 1K 9K 166960K 12 0 counters 33 17K 18K 166960K 65 0 ioctlops 0 0K 4K 166960K 363 0 iov 0 0K 28K 166960K 54 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1353 85K 85K 166960K 2053 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 26 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 81K 166960K 788 0 sigio 0 0K 0K 166960K 18 0 proc 60 59K 91K 166960K 617 0 subproc 72 4K 4K 166960K 87 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 283 0 in_multi 98 7K 7K 166960K 156 0 ether_multi 1 0K 0K 166960K 10 0 mrt 1 0K 0K 166960K 28 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 468 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 242 145K 163K 166960K 8867 0 UVM aobj 18 12K 12K 166960K 21 0 pinsyscall 41 82K 90K 166960K 1924 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 40 0 NDP 11 0K 2K 166960K 51 0 temp 64 9071K 9147K 166960K 43233 0 kqueue 14 22K 30K 166960K 159 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 85 0 81 1 0 1 1 0 8 0 rtentry 136 135 0 34 4 0 4 4 0 8 0 unpcb 144 434 0 418 2 1 1 2 0 8 0 syncache 336 10 0 10 1 1 0 1 0 8 0 tcpqe 32 6 0 6 1 1 0 1 0 8 0 tcpcb 736 278 0 268 7 3 4 7 0 8 2 arp 96 20 0 2 1 0 1 1 0 8 0 ipq 40 4 0 0 1 0 1 1 0 8 0 ipqe 40 7 0 3 1 0 1 1 0 8 0 inpcb 328 774 0 759 12 8 4 12 0 8 2 ip6q 72 4 0 1 1 0 1 1 0 8 0 ip6af 40 6 0 2 1 0 1 1 0 8 0 nd6 112 29 0 5 1 0 1 1 0 8 0 pkpcb 40 41 0 41 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 1 0 1 0 8 0 ppxss 1072 26 0 26 1 1 0 1 0 8 0 pppxif 1384 2 0 2 1 1 0 1 0 8 0 pfstscr 40 3 0 3 1 1 0 1 0 8 0 pfosfp 40 2 0 0 1 0 1 1 0 8 0 pfosfpen 112 2 0 0 1 0 1 1 0 8 0 pfrktable 1344 12 0 5 1 0 1 1 0 8 0 pfsrclim 320 2 0 1 1 0 1 1 0 8 0 pfanchor 1288 4 0 3 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 1 1 1 0 1 0 8 0 pfstitem 24 5 0 0 1 0 1 1 0 8 0 pfstkey 128 11 0 6 1 0 1 1 0 8 0 pfstate 384 6 0 3 1 0 1 1 0 8 0 pfrule 1360 12 0 9 1 0 1 1 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 622 0 176 31 1 30 31 0 8 0 art_table 40 624 0 176 5 0 5 5 0 8 0 art_node 32 134 0 43 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 9 1 0 1 1 0 8 0 semupl 112 2 0 2 2 1 1 1 0 8 1 semapl 112 23 0 13 1 0 1 1 0 8 0 shmpl 112 13 0 2 1 0 1 1 0 8 0 dirhash 1024 22 0 5 3 0 3 3 0 8 0 dino2pl 256 2819 0 1370 92 0 92 92 0 8 0 ffsino 256 2819 0 1370 92 0 92 92 0 8 0 nchpl 144 3879 0 2183 64 0 64 64 0 8 0 rtmask 32 5 0 5 1 1 0 1 0 8 0 vnodes 216 3343 0 0 186 0 186 186 0 8 0 namei 1024 13295 0 13295 3 2 1 2 0 8 1 vcpupl 3904 5 0 1 1 0 1 1 0 8 0 vmpool 808 5 0 1 1 0 1 1 0 8 0 pfiaddrpl 120 4 0 0 1 0 1 1 0 8 0 kstatmem 264 64 0 42 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 15705 0 15704 9 7 2 8 1 8 1 plimitpl 152 147 0 131 1 0 1 1 0 8 0 sigapl 424 1083 0 1038 6 0 6 6 0 8 0 knotepl 120 30483 0 30434 22 14 8 17 0 8 5 kqueuepl 184 325 0 314 4 3 1 4 0 8 0 pipepl 304 204 0 176 3 0 3 3 0 8 0 fdescpl 448 1069 0 1038 4 0 4 4 0 8 0 filepl 120 6483 0 6258 12 4 8 12 0 8 0 lockfpl 104 291 0 287 1 0 1 1 0 8 0 lockfspl 48 117 0 114 1 0 1 1 0 8 0 sessionpl 144 28 0 20 1 0 1 1 0 8 0 pgrppl 48 44 0 28 1 0 1 1 0 8 0 ucredpl 104 813 0 802 1 0 1 1 0 8 0 zombiepl 144 1041 0 1038 1 0 1 1 0 8 0 processpl 1152 1083 0 1038 4 0 4 4 0 8 0 procpl 664 2098 0 2045 6 0 6 6 0 8 0 sosppl 176 8 0 8 2 1 1 1 0 8 1 sockpl 552 1487 0 1452 12 7 5 12 0 8 2 mcl64k 65536 59 0 58 1 0 1 1 0 8 0 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 12 0 12 2 1 1 1 0 8 1 mcl4k 4096 3313 0 3259 15 7 8 14 0 8 1 mcl2k 2048 792 0 789 3 1 2 3 0 8 0 mtagpl 96 8 0 4 1 0 1 1 0 8 0 mbufpl 256 12490 0 12300 15 0 15 15 0 8 0 bufpl 280 5546 0 116 388 0 388 388 0 8 0 anonpl 24 182066 0 178685 62 29 33 59 0 187 3 amapchunkpl 152 48692 0 48170 39 14 25 35 0 158 4 amappl16 200 3486 0 3459 23 20 3 16 0 8 0 amappl15 192 20 0 20 1 1 0 1 0 8 0 amappl14 184 418 0 416 1 0 1 1 0 8 0 amappl13 176 127 0 116 1 0 1 1 0 8 0 amappl12 168 1339 0 1309 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 57 0 47 1 0 1 1 0 8 0 amappl9 144 265 0 265 1 1 0 1 0 8 0 amappl8 136 118 0 115 1 0 1 1 0 8 0 amappl7 128 50 0 47 1 0 1 1 0 8 0 amappl6 120 260 0 247 1 0 1 1 0 8 0 amappl5 112 84 0 77 1 0 1 1 0 8 0 amappl4 104 482 0 446 2 0 2 2 0 8 0 amappl3 96 5015 0 4914 3 0 3 3 0 8 0 amappl2 88 1167 0 1102 2 0 2 2 0 8 0 amappl1 80 13102 0 12531 14 1 13 14 0 8 0 amappl 88 8002 0 7827 5 0 5 5 0 92 1 uvmvnodes 80 124 0 0 3 0 3 3 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 128 253 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 20 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1069 0 1038 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1069 0 1038 1 0 1 1 0 8 0 vmmpekpl 168 10283 0 10252 2 0 2 2 0 8 0 vmmpepl 168 75619 0 73730 94 7 87 94 0 357 0 vmsppl 368 1068 0 1038 4 1 3 4 0 8 0 rwobjpl 40 23014 0 21961 14 0 14 14 0 8 0 pdppl 4096 2154 0 2082 94 21 73 74 0 8 1 pvpl 32 497434 0 487302 142 52 90 141 0 265 2 pmappl 216 1073 0 1039 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 376 0 42 11 1 10 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8340c772) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8344cdf7,ffffffff83438908,90,ffffffff833ebab7) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8006c6d700,fffffd806d116528,4b816b000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806d116528,4b816b000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806d116518,9702d686000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806d116518,9702d686000,6d1b5000,4,20) at pmap_enter+0x3a3 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower_lookup(ffff800034cedca0,ffff800034cedcd8,ffff800034cedc20) at uvm_fault_lower_lookup+0x328 sys/uvm/uvm_fault.c:-1 uvm_fault_lower(ffff800034cedca0,ffff800034cedcd8,ffff800034cedc20) at uvm_fault_lower+0x85 sys/uvm/uvm_fault.c:1334 uvm_fault(fffffd800c0815d8,9702d689000,0,4) at uvm_fault+0x241 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800034cede40,9702d689e7b) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800034cede40) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x738faf545990, count: -13 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8340c772) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff8344cdf7,ffffffff83438908,90,ffffffff833ebab7) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagealloc_pg(fffffd8006c6d700,fffffd806d116528,4b816b000,0) at uvm_pagealloc_pg+0x54b sys/uvm/uvm_page.c:707 uvm_pagealloc(fffffd806d116528,4b816b000,0,3) at uvm_pagealloc+0x252 sys/uvm/uvm_page.c:913 pmap_get_ptp(fffffd806d116518,9702d686000) at pmap_get_ptp+0x1d0 sys/arch/amd64/amd64/pmap.c:-1 pmap_enter(fffffd806d116518,9702d686000,6d1b5000,4,20) at pmap_enter+0x3a3 sys/arch/amd64/amd64/pmap.c:-1 uvm_fault_lower_lookup(ffff800034cedca0,ffff800034cedcd8,ffff800034cedc20) at uvm_fault_lower_lookup+0x328 sys/uvm/uvm_fault.c:-1 uvm_fault_lower(ffff800034cedca0,ffff800034cedcd8,ffff800034cedc20) at uvm_fault_lower+0x85 sys/uvm/uvm_fault.c:1334 uvm_fault(fffffd800c0815d8,9702d689000,0,4) at uvm_fault+0x241 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800034cede40,9702d689e7b) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800034cede40) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x738faf545990, count: -13