panic: kernel diagnostic assertion "pg->wire_count == 0" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1326 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *505394 74184 0 0 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8337b37c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833ba7b3,ffffffff833a3e01,52e,ffffffff833d457a) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagedequeue(fffffd80073f1200) at uvm_pagedequeue+0x2cd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd806c6715b0,0,0,19) at uvn_flush+0xb8f sys/uvm/uvm_vnode.c:818 uvn_detach(fffffd806c6715b0) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80003c95ad70,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_mapanon(fffffd8071b6de78,ffff80003c95af98,400000,0,3090713) at uvm_mapanon+0x854 sys/uvm/uvm_map.c:910 uvm_mmapanon(fffffd8071b6de78,ffff80003c95af98,400000,3,7,5012,9e1e366c9dfc375d,fffffd8071b6de78) at uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff80002a7bcd10,ffff80003c95b0f0,ffff80003c95b040) at sys_mmap+0xa60 sys/uvm/uvm_mmap.c:426 syscall(ffff80003c95b0f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c95b0f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2318901c70, 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 "pg->wire_count == 0" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1326 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8337b37c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833ba7b3,ffffffff833a3e01,52e,ffffffff833d457a) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagedequeue(fffffd80073f1200) at uvm_pagedequeue+0x2cd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd806c6715b0,0,0,19) at uvn_flush+0xb8f sys/uvm/uvm_vnode.c:818 uvn_detach(fffffd806c6715b0) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80003c95ad70,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_mapanon(fffffd8071b6de78,ffff80003c95af98,400000,0,3090713) at uvm_mapanon+0x854 sys/uvm/uvm_map.c:910 uvm_mmapanon(fffffd8071b6de78,ffff80003c95af98,400000,3,7,5012,9e1e366c9dfc375d,fffffd8071b6de78) at uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff80002a7bcd10,ffff80003c95b0f0,ffff80003c95b040) at sys_mmap+0xa60 sys/uvm/uvm_mmap.c:426 syscall(ffff80003c95b0f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c95b0f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2318901c70, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80003c95aa70 rbx 0x1 rdx 0xffff8000015487c0 rcx 0 rax 0xffff80002a7bcd10 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc67008d76eada967 r11 0xaa5c575724f9c25c r12 0 r13 0x1 r14 0 r15 0x1 rip 0xffffffff820dbab5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c95aa60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=505394 pid=74184 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a7bdca0,0xffffffff8390f8d0 process=0xffff8000ffff8918 user=0xffff80003c956000, vmspace=0xfffffd8071b6de78 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 74184 160555 45896 0 2 0 syz-executor *74184 505394 45896 0 7 0x4000000 syz-executor 44126 394358 96978 0 3 0x80 nanoslp syz-executor 44126 416663 96978 0 3 0x4000080 wsevent_read syz-executor 44126 323549 96978 0 3 0x4000080 fsleep syz-executor 90001 208708 0 0 3 0x14200 acct acct 3416 113900 1343 0 3 0x80 nanoslp syz-executor 3416 484529 1343 0 3 0x4000080 piperd syz-executor 3416 294799 1343 0 3 0x4000080 ttyout syz-executor 96978 307942 46907 0 3 0x82 nanoslp syz-executor 27617 265116 46907 0 3 0x82 nanoslp syz-executor 50755 134283 46907 0 2 0x2 syz-executor 33748 420545 46907 0 3 0x82 nanoslp syz-executor 1343 81683 46907 0 3 0x82 nanoslp syz-executor 69421 33772 46907 0 3 0x82 nanoslp syz-executor 45896 523932 46907 0 3 0x82 nanoslp syz-executor 95478 160815 46907 0 3 0x82 wait syz-executor 46907 485078 52660 0 3 0x82 kqread syz-executor 52660 168835 66385 0 3 0x10008a sigsusp ksh 66385 484161 32450 0 3 0x98 kqread sshd-session 32450 485796 46391 0 3 0x92 kqread sshd-session 84401 348521 1 0 3 0x100083 ttyin getty 46391 498184 1 0 3 0x88 kqread sshd 35411 75375 54107 73 3 0x1100090 kqread syslogd 54107 236416 1 0 3 0x100082 sbwait syslogd 13610 246609 1 0 3 0x100080 kqread resolvd 52210 487096 38099 77 3 0x100092 kqread dhcpleased 5297 466670 38099 77 3 0x100092 kqread dhcpleased 38099 370616 1 0 3 0x80 kqread dhcpleased 40680 470033 0 0 3 0x14200 bored smr 6546 244186 0 0 2 0x14200 zerothread 66360 449485 0 0 3 0x14200 aiodoned aiodoned 18456 71162 0 0 3 0x14200 syncer update 26959 238422 0 0 3 0x14200 cleaner cleaner 28918 415189 0 0 3 0x14200 reaper reaper 58584 10775 0 0 3 0x14200 pgdaemon pagedaemon 13544 250041 0 0 3 0x14200 bored viomb 85165 53178 0 0 3 0x40014200 acpi0 acpi0 95737 101148 0 0 3 0x14200 bored softnet0 13780 145111 0 0 3 0x14200 bored systqmp 25451 19443 0 0 3 0x14200 bored systq 8848 341608 0 0 3 0x40014200 tmoslp softclock 52259 430070 0 0 3 0x40014200 idle0 1 510878 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 11069 12176K 12761K 166960K 13544 0 pcb 17 14K 14K 166960K 205 0 rtable 246 9K 9K 166960K 475 0 pf 34 13K 15K 166960K 82 0 ifaddr 43 7K 7K 166960K 74 0 ifgroup 55 2K 2K 166960K 110 0 sysctl 3 1K 9K 166960K 11 0 counters 35 18K 18K 166960K 68 0 ioctlops 0 0K 4K 166960K 118 0 iov 0 0K 12K 166960K 189 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1434 90K 91K 166960K 2027 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 16 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 698 0 sigio 0 0K 0K 166960K 4 0 proc 64 67K 91K 166960K 542 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 61 0 in_multi 99 7K 7K 166960K 127 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 422 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 232 160K 165K 166960K 7705 0 UVM aobj 96 15K 17K 166960K 100 0 pinsyscall 38 76K 93K 166960K 1814 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 38 0 NDP 12 0K 2K 166960K 50 0 temp 49 8661K 8726K 166960K 29794 0 kqueue 13 20K 32K 166960K 142 0 SYN cache 2 8K 16K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 87 0 84 1 0 1 1 0 8 0 rtentry 136 136 0 33 4 0 4 4 0 8 0 unpcb 144 451 0 436 1 0 1 1 0 8 0 syncache 336 8 0 8 1 0 1 1 0 8 1 tcpqe 32 4 0 4 1 0 1 1 0 8 1 tcpcb 736 208 0 200 7 0 7 7 0 8 6 arp 96 20 0 4 1 0 1 1 0 8 0 ipq 40 3 0 1 1 0 1 1 0 8 0 ipqe 40 5 0 3 1 0 1 1 0 8 0 inpcb 328 773 0 762 7 0 7 7 0 8 5 ip6q 72 1 0 1 1 0 1 1 0 8 1 ip6af 40 2 0 2 1 0 1 1 0 8 1 nd6 112 27 0 3 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 28 0 27 1 0 1 1 0 8 0 pppxif 1384 4 0 3 1 0 1 1 0 8 0 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 9 0 5 1 0 1 1 0 482 0 pffrnode 88 9 0 5 1 0 1 1 0 8 0 pffrent 40 16 0 11 1 0 1 1 0 8 0 pfrktable 1344 4 0 4 1 0 1 1 0 8 1 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 4 0 2 1 0 1 1 0 8 0 pfstkey 128 4 0 0 1 0 1 1 0 8 0 pfstate 384 2 0 1 1 0 1 1 0 8 0 pfrule 1344 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 618 0 138 31 0 31 31 0 8 0 art_table 40 621 0 138 6 0 6 6 0 8 0 art_node 32 135 0 44 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 92 0 3 3 0 3 3 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2580 0 1081 95 0 95 95 0 8 0 ffsino 256 2580 0 1081 95 0 95 95 0 8 0 nchpl 144 3525 0 1831 64 0 64 64 0 8 0 rtmask 32 9 0 9 1 0 1 1 0 8 1 vnodes 216 3116 0 0 174 0 174 174 0 8 0 namei 1024 11710 0 11710 2 0 2 2 0 8 2 vcpupl 3904 4 0 0 1 0 1 1 0 8 0 vmpool 808 5 0 1 1 0 1 1 0 8 0 kstatmem 264 60 0 36 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 11448 0 11448 8 0 8 8 1 8 8 plimitpl 152 172 0 155 1 0 1 1 0 8 0 sigapl 424 982 0 939 6 0 6 6 0 8 1 knotepl 120 24198 0 24151 10 0 10 10 0 8 7 kqueuepl 184 203 0 194 1 0 1 1 0 8 0 pipepl 304 169 0 141 3 0 3 3 0 8 0 fdescpl 448 964 0 935 5 0 5 5 0 8 1 filepl 120 5367 0 5151 10 0 10 10 0 8 1 lockfpl 104 212 0 209 1 0 1 1 0 8 0 lockfspl 48 97 0 94 1 0 1 1 0 8 0 sessionpl 144 27 0 19 1 0 1 1 0 8 0 pgrppl 48 46 0 30 1 0 1 1 0 8 0 ucredpl 104 811 0 800 1 0 1 1 0 8 0 zombiepl 144 943 0 939 1 0 1 1 0 8 0 processpl 1152 982 0 939 4 0 4 4 0 8 0 procpl 664 1748 0 1700 6 0 6 6 0 8 1 sosppl 176 6 0 6 1 0 1 1 0 8 1 sockpl 552 1329 0 1300 8 0 8 8 0 8 5 mcl64k 65536 102 0 102 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 8 0 8 1 0 1 1 0 8 1 mcl4k 4096 3191 0 3137 15 0 15 15 0 8 8 mcl2k 2048 1247 0 1240 3 0 3 3 0 8 2 mtagpl 96 35 0 8 1 0 1 1 0 8 0 mbufpl 256 11509 0 11297 76 54 22 76 0 8 6 bufpl 280 3656 0 122 253 0 253 253 0 8 0 anonpl 24 168178 0 165007 48 0 48 48 0 187 17 amapchunkpl 152 25402 0 24807 31 0 31 31 0 158 6 amappl16 200 2689 0 2659 5 0 5 5 0 8 2 amappl15 192 5 0 5 1 0 1 1 0 8 1 amappl14 184 4 0 4 1 0 1 1 0 8 1 amappl13 176 418 0 417 1 0 1 1 0 8 0 amappl12 168 1327 0 1288 2 0 2 2 0 8 0 amappl11 160 54 0 54 1 0 1 1 0 8 1 amappl10 152 71 0 61 1 0 1 1 0 8 0 amappl9 144 259 0 259 1 0 1 1 0 8 1 amappl8 136 25 0 24 1 0 1 1 0 8 0 amappl7 128 86 0 84 1 0 1 1 0 8 0 amappl6 120 293 0 281 1 0 1 1 0 8 0 amappl5 112 98 0 91 1 0 1 1 0 8 0 amappl4 104 416 0 392 1 0 1 1 0 8 0 amappl3 96 4805 0 4701 3 0 3 3 0 8 0 amappl2 88 569 0 515 2 0 2 2 0 8 0 amappl1 80 12516 0 11972 13 0 13 13 0 8 0 amappl 88 6833 0 6672 5 0 5 5 0 92 0 uvmvnodes 80 117 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma2048 2048 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 128 253 0 253 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 99 0 4 2 0 2 2 0 8 0 uaddrrnd 24 964 0 935 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 964 0 935 1 0 1 1 0 8 0 vmmpekpl 168 9155 0 9117 2 0 2 2 0 8 0 vmmpepl 168 68697 0 66907 87 0 87 87 0 357 6 vmsppl 368 963 0 935 4 0 4 4 0 8 1 rwobjpl 40 20609 0 19559 12 0 12 12 0 8 0 pdppl 4096 1944 0 1876 103 33 70 78 0 8 2 pvpl 32 449583 0 440487 132 0 132 132 0 265 37 pmappl 216 968 0 936 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 451 0 87 12 0 12 12 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(ffffffff8337b37c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833ba7b3,ffffffff833a3e01,52e,ffffffff833d457a) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagedequeue(fffffd80073f1200) at uvm_pagedequeue+0x2cd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd806c6715b0,0,0,19) at uvn_flush+0xb8f sys/uvm/uvm_vnode.c:818 uvn_detach(fffffd806c6715b0) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80003c95ad70,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_mapanon(fffffd8071b6de78,ffff80003c95af98,400000,0,3090713) at uvm_mapanon+0x854 sys/uvm/uvm_map.c:910 uvm_mmapanon(fffffd8071b6de78,ffff80003c95af98,400000,3,7,5012,9e1e366c9dfc375d,fffffd8071b6de78) at uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff80002a7bcd10,ffff80003c95b0f0,ffff80003c95b040) at sys_mmap+0xa60 sys/uvm/uvm_mmap.c:426 syscall(ffff80003c95b0f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c95b0f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2318901c70, 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(ffffffff8337b37c) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833ba7b3,ffffffff833a3e01,52e,ffffffff833d457a) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagedequeue(fffffd80073f1200) at uvm_pagedequeue+0x2cd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd806c6715b0,0,0,19) at uvn_flush+0xb8f sys/uvm/uvm_vnode.c:818 uvn_detach(fffffd806c6715b0) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff80003c95ad70,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_mapanon(fffffd8071b6de78,ffff80003c95af98,400000,0,3090713) at uvm_mapanon+0x854 sys/uvm/uvm_map.c:910 uvm_mmapanon(fffffd8071b6de78,ffff80003c95af98,400000,3,7,5012,9e1e366c9dfc375d,fffffd8071b6de78) at uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 sys_mmap(ffff80002a7bcd10,ffff80003c95b0f0,ffff80003c95b040) at sys_mmap+0xa60 sys/uvm/uvm_mmap.c:426 syscall(ffff80003c95b0f0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80003c95b0f0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc2318901c70, count: -12