panic: kernel diagnosti c assertion "(pg->pg_fl ags & (PQ_INACTIVE|PQ_A CTIVE)) == 0" failed: f ile "/syzkaller/manager s/main/kernel/sys/uvm/u vm_page.c", line 1306 Stopped at db_ente r+0x25: addq $0x8,%r sp TID PID UID P RFLAGS PFLAGS CPU C OMMAND *160738 17253 0 0 0 0 syz-e xecutor db_enter() at db_enter+ 0x25 panic(ffffffff833791f3) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b9a e2,ffffffff833a5ef6,51a ,ffffffff833eb71f) at _ _assert+0x29 uvm_pageactivate(fffffd 8006e5e300) at uvm_page activate+0x1e2 uvm_fault_lower(ffff800 037e38e30,ffff800037e38 e68,ffff800037e38db0) a t uvm_fault_lower+0x22a uvm_fault(fffffd806c9cd a28,200000000000,0,2) a t uvm_fault+0x241 upageflttrap(ffff800037 e38fd0,200000000040) at upageflttrap+0xa0 usertrap(ffff800037e38f d0) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall _trap+0x8 end of kernel end trace frame: 0x7842 ab0b6c20, count: 6 https://www.openbsd.org /ddb.html describes the minimum info required i n bug reports. Insufficient i nfo makes it difficult t o find and fix bugs. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "(pg->pg_flags & (PQ_INACTIVE|PQ_ACTIVE)) == 0" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1306 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833791f3) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b9ae2,ffffffff833a5ef6,51a,ffffffff833eb71f) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageactivate(fffffd8006e5e300) at uvm_pageactivate+0x1e2 sys/uvm/uvm_page.c:1303 uvm_fault_lower(ffff800037e38e30,ffff800037e38e68,ffff800037e38db0) at uvm_fault_lower+0x22a sys/uvm/uvm_fault.c:1391 uvm_fault(fffffd806c9cda28,200000000000,0,2) at uvm_fault+0x241 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800037e38fd0,200000000040) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800037e38fd0) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7842ab0b6c20, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800037e38b70 rbx 0 rdx 0 rcx 0 rax 0xffff80003c93afb0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x735278ebe4b070e3 r11 0x75d7d3770a59dd82 r12 0 r13 0xfffffd8006e5e300 r14 0 r15 0x1 rip 0xffffffff81744d05 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800037e38b60 ss 0 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=160738 pid=17253 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7a6010,0xffff80003c93b258 process=0xffff8000ffff8918 user=0xffff800037e34000, vmspace=0xfffffd806c9cda28 estcpu=36, cpticks=6, pctcpu=0.0, user=4, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *17253 160738 1434 0 7 0 syz-executor 17253 167541 1434 0 3 0x4000080 fsleep syz-executor 17253 87000 1434 0 3 0x4000080 fsleep syz-executor 33634 402595 90861 0 2 0 syz-executor 33634 407213 90861 0 3 0x4000080 fsleep syz-executor 33634 203760 90861 0 3 0x4000080 fsleep syz-executor 65950 83865 94858 0 2 0 syz-executor 65950 348637 94858 0 3 0x4000080 lockf syz-executor 65950 231666 94858 0 3 0x4000080 fsleep syz-executor 65950 348255 94858 0 3 0x4000080 fsleep syz-executor 53503 253739 38124 0 2 0 syz-executor 53503 111527 38124 0 2 0x4000000 syz-executor 75098 221207 78961 0 2 0 syz-executor 47905 221780 64786 0 3 0x3000 suspend syz-executor 47905 249295 64786 0 2 0x4081000 syz-executor 47905 258123 64786 0 2 0x4081000 syz-executor 47905 182704 64786 0 2 0x4081000 syz-executor 74007 85003 69437 0 2 0 syz-executor 74007 283848 69437 0 3 0x4000080 fsleep syz-executor 74007 289095 69437 0 2 0x4000000 syz-executor 74007 455891 69437 0 2 0x4000000 syz-executor 78555 173961 10010 0 2 0 syz-executor 78555 505372 10010 0 3 0x4000080 ttyout syz-executor 78555 35499 10010 0 3 0x4000080 ttyin syz-executor 78555 125206 10010 0 3 0x4000080 fsleep syz-executor 78961 18763 86534 0 2 0xc82 syz-executor 94858 229853 86534 0 2 0xc82 syz-executor 47246 7655 1 0 3 0x100083 ttyopn getty 10010 198734 86534 0 2 0xc82 syz-executor 38124 43011 86534 0 2 0xc82 syz-executor 69437 517291 86534 0 2 0xc82 syz-executor 60754 48615 0 0 3 0x14280 nfsidl nfsio 31436 188286 0 0 3 0x14280 nfsidl nfsio 48601 515961 0 0 3 0x14280 nfsidl nfsio 99821 50136 0 0 3 0x14280 nfsidl nfsio 90871 483816 0 0 3 0x14280 nfsidl nfsio 7826 434982 0 0 3 0x14280 nfsidl nfsio 31427 365224 0 0 3 0x14280 nfsidl nfsio 23654 7212 0 0 3 0x14280 nfsidl nfsio 90410 463341 0 0 3 0x14280 nfsidl nfsio 8173 371016 0 0 3 0x14280 nfsidl nfsio 59955 297976 0 0 3 0x14280 nfsidl nfsio 42825 422332 0 0 3 0x14280 nfsidl nfsio 13295 295461 0 0 3 0x14280 nfsidl nfsio 21366 262291 0 0 3 0x14280 nfsidl nfsio 59843 270799 0 0 3 0x14280 nfsidl nfsio 560 508633 0 0 3 0x14280 nfsidl nfsio 12353 29695 0 0 3 0x14280 nfsidl nfsio 34749 466191 0 0 3 0x14280 nfsidl nfsio 53148 72358 0 0 3 0x14280 nfsidl nfsio 7397 215514 0 0 3 0x14280 nfsidl nfsio 64786 411196 86534 0 2 0xc82 syz-executor 90861 223158 86534 0 2 0xc82 syz-executor 1434 218531 86534 0 2 0xc82 syz-executor 86534 91421 93667 0 3 0x82 kqread syz-executor 93667 474782 10232 0 3 0x10008a sigsusp ksh 10232 190583 36750 0 3 0x98 kqread sshd-session 36750 515406 39347 0 3 0x92 kqread sshd-session 39347 88212 1 0 3 0x88 kqread sshd 77128 195617 10719 73 3 0x1100090 kqread syslogd 10719 126263 1 0 3 0x100082 sbwait syslogd 18815 189702 1 0 3 0x100080 kqread resolvd 27176 201587 55546 77 3 0x100092 kqread dhcpleased 70842 135512 55546 77 3 0x100092 kqread dhcpleased 55546 296448 1 0 3 0x80 kqread dhcpleased 41004 147682 0 0 3 0x14200 bored smr 59549 379171 0 0 2 0x14200 zerothread 92003 488335 0 0 3 0x14200 aiodoned aiodoned 25515 88843 0 0 3 0x14200 syncer update 68012 321568 0 0 3 0x14200 cleaner cleaner 34735 392263 0 0 3 0x14200 reaper reaper 40126 114242 0 0 3 0x14200 pgdaemon pagedaemon 95086 363557 0 0 3 0x14200 bored viomb 37510 346673 0 0 3 0x40014200 acpi0 acpi0 47769 365955 0 0 3 0x14200 bored softnet0 96968 131082 0 0 3 0x14200 bored systqmp 51997 417971 0 0 3 0x14200 bored systq 83737 74587 0 0 3 0x40014200 tmoslp softclock 74999 221668 0 0 3 0x40014200 idle0 1 105928 0 0 3 0x80082 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 10217 11048K 12376K 166960K 15807 0 pcb 17 17K 25K 166960K 863 0 rtable 180 11K 11K 166960K 854 0 pf 35 14K 17K 166960K 328 0 ifaddr 31 5K 8K 166960K 181 0 ifgroup 55 2K 2K 166960K 328 0 sysctl 4 1K 9K 166960K 18 0 counters 35 18K 18K 166960K 181 0 ioctlops 0 0K 4K 166960K 658 0 iov 0 0K 28K 166960K 264 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1575 99K 99K 166960K 4075 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 41 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 87 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 2372 0 sigio 0 0K 0K 166960K 128 0 proc 61 59K 100K 166960K 1014 0 subproc 72 4K 4K 166960K 153 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 472 0 in_multi 53 4K 7K 166960K 262 0 ether_multi 1 0K 0K 166960K 20 0 mrt 0 0K 0K 166960K 12 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 277 1235K 1235K 166960K 277 0 exec 0 0K 1K 166960K 865 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 238 144K 171K 166960K 22763 0 UVM aobj 53 16K 16K 166960K 56 0 pinsyscall 39 78K 94K 166960K 3706 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 186 0 NDP 12 0K 1K 166960K 138 0 temp 79 8672K 8926K 166960K 97605 0 kqueue 16 24K 32K 166960K 410 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 120 207 0 200 1 0 1 1 0 8 0 rtentry 136 242 0 187 4 0 4 4 0 8 0 unpcb 144 1908 0 1892 4 0 4 4 0 8 3 syncache 336 15 0 15 2 1 1 1 0 8 1 tcpqe 32 18 0 18 2 1 1 1 0 8 1 tcpcb 736 893 0 889 16 8 8 10 0 8 7 arp 96 38 0 27 1 0 1 1 0 8 0 ipq 40 10 0 9 1 0 1 1 0 8 0 ipqe 40 16 0 15 1 0 1 1 0 8 0 inpcb 328 2477 0 2466 18 10 8 12 0 8 7 ip6q 72 8 0 8 1 0 1 1 0 8 1 ip6af 40 13 0 13 1 0 1 1 0 8 1 nd6 112 56 0 45 1 0 1 1 0 8 0 pkpcb 40 47 0 47 2 1 1 1 0 8 1 kcovpl 48 17 0 9 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 1 0 1 0 8 0 ppxss 1072 111 0 110 2 1 1 1 0 8 0 pppxif 1384 10 0 9 2 1 1 1 0 8 0 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfrule 1344 2 0 1 1 0 1 1 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1076 0 818 30 11 19 29 0 8 0 art_table 40 1080 0 818 5 0 5 5 0 8 0 art_node 32 241 0 191 1 0 1 1 0 8 0 sysvmsgpl 40 51 0 12 1 0 1 1 0 8 0 semapl 112 84 0 74 1 0 1 1 0 8 0 shmpl 112 45 0 2 2 0 2 2 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 5721 0 4205 96 0 96 96 0 8 0 ffsino 256 5721 0 4205 96 0 96 96 0 8 0 nchpl 144 8935 0 7215 64 0 64 64 0 8 0 rtmask 32 25 0 25 2 1 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 32968 0 32966 3 2 1 2 0 8 0 vcpupl 3904 7 0 0 1 0 1 1 0 8 0 vmpool 808 8 0 1 1 0 1 1 0 8 0 kstatmem 264 206 0 182 3 1 2 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 7 0 7 1 1 0 1 0 8 0 scxspl 216 31410 0 31410 9 7 2 8 1 8 2 plimitpl 152 742 0 725 1 0 1 1 0 8 0 sigapl 424 2661 0 2598 8 0 8 8 0 8 0 knotepl 120 87222 0 87170 35 26 9 17 0 8 5 kqueuepl 184 798 0 785 5 2 3 3 0 8 2 pipepl 304 435 0 375 7 2 5 5 0 8 0 fdescpl 448 2624 0 2594 5 1 4 5 0 8 0 filepl 120 18163 0 17867 15 4 11 13 0 8 1 lockfpl 104 1457 0 1450 2 1 1 2 0 8 0 lockfspl 48 491 0 486 1 0 1 1 0 8 0 sessionpl 144 40 0 32 1 0 1 1 0 8 0 pgrppl 48 123 0 106 1 0 1 1 0 8 0 ucredpl 104 2828 0 2816 1 0 1 1 0 8 0 zombiepl 144 3002 0 3001 1 0 1 1 0 8 0 processpl 1152 2661 0 2598 5 0 5 5 0 8 0 procpl 664 6041 0 5960 8 1 7 8 0 8 0 sosppl 176 12 0 12 2 1 1 1 0 8 1 sockpl 552 4846 0 4812 17 6 11 13 0 8 8 mcl64k 65536 138 0 138 1 0 1 1 0 8 1 mcl16k 16384 3 0 3 2 1 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k 9216 3 0 3 2 1 1 1 0 8 1 mcl8k 8192 25 0 25 2 1 1 1 0 8 1 mcl4k 4096 5415 0 5361 13 5 8 13 0 8 0 mcl2k2 2112 3 0 3 1 1 0 1 0 8 0 mcl2k 2048 3569 0 3564 6 3 3 5 0 8 1 mtagpl 96 120 0 116 3 1 2 3 0 8 1 mbufpl 256 27866 0 27712 21 4 17 21 0 8 0 bufpl 280 11309 0 5088 445 0 445 445 0 8 0 anonpl 24 382301 0 379066 80 23 57 57 0 187 20 amapchunkpl 152 80009 0 79386 40 7 33 34 0 158 8 amappl16 200 6270 0 6233 35 21 14 15 0 8 8 amappl15 192 37 0 37 1 1 0 1 0 8 0 amappl14 184 103 0 103 2 1 1 1 0 8 1 amappl13 176 520 0 519 1 0 1 1 0 8 0 amappl12 168 3056 0 3017 3 1 2 3 0 8 0 amappl11 160 101 0 101 1 1 0 1 0 8 0 amappl10 152 54 0 44 1 0 1 1 0 8 0 amappl9 144 243 0 242 1 0 1 1 0 8 0 amappl8 136 19 0 16 1 0 1 1 0 8 0 amappl7 128 120 0 118 1 0 1 1 0 8 0 amappl6 120 386 0 374 1 0 1 1 0 8 0 amappl5 112 78 0 70 1 0 1 1 0 8 0 amappl4 104 475 0 450 1 0 1 1 0 8 0 amappl3 96 15726 0 15616 4 0 4 4 0 8 0 amappl2 88 669 0 612 2 0 2 2 0 8 0 amappl1 80 19838 0 19298 15 2 13 15 0 8 0 amappl 88 21446 0 21276 5 0 5 5 0 92 0 uvmvnodes 80 165 0 0 4 0 4 4 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 1 1 0 1 0 8 0 dma64 64 9 0 9 2 1 1 1 0 8 1 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 55 0 3 1 0 1 1 0 8 0 uaddrrnd 24 2624 0 2594 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2624 0 2594 1 0 1 1 0 8 0 vmmpekpl 168 20306 0 20244 3 0 3 3 0 8 0 vmmpepl 168 168207 0 166338 100 8 92 93 0 357 5 vmsppl 368 2623 0 2594 4 1 3 4 0 8 0 rwobjpl 40 42151 0 41074 14 0 14 14 0 8 0 pdppl 4096 5270 0 5197 124 51 73 82 0 8 0 pvpl 32 1116805 0 1108329 160 27 133 133 0 265 38 pmappl 216 2631 0 2595 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 435 0 94 11 0 11 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(ffffffff833791f3) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b9ae2,ffffffff833a5ef6,51a,ffffffff833eb71f) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageactivate(fffffd8006e5e300) at uvm_pageactivate+0x1e2 sys/uvm/uvm_page.c:1303 uvm_fault_lower(ffff800037e38e30,ffff800037e38e68,ffff800037e38db0) at uvm_fault_lower+0x22a sys/uvm/uvm_fault.c:1391 uvm_fault(fffffd806c9cda28,200000000000,0,2) at uvm_fault+0x241 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800037e38fd0,200000000040) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800037e38fd0) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7842ab0b6c20, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833791f3) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833b9ae2,ffffffff833a5ef6,51a,ffffffff833eb71f) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageactivate(fffffd8006e5e300) at uvm_pageactivate+0x1e2 sys/uvm/uvm_page.c:1303 uvm_fault_lower(ffff800037e38e30,ffff800037e38e68,ffff800037e38db0) at uvm_fault_lower+0x22a sys/uvm/uvm_fault.c:1391 uvm_fault(fffffd806c9cda28,200000000000,0,2) at uvm_fault+0x241 sys/uvm/uvm_fault.c:-1 upageflttrap(ffff800037e38fd0,200000000040) at upageflttrap+0xa0 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff800037e38fd0) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7842ab0b6c20, count: -9