panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/main/kernel/sys/uvm/uvm_page.c", line 1250 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83412703) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452f45,ffffffff8343be37,4e2,ffffffff833aaf47) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80042d8480) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ccf4010,76f51b3c000,76f51f3b000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ccf4010,fffffd806d800800,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ccf4010) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ccf4010) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a76b770,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a76b770,ffff8000360dfbd0,ffff8000360dfb20) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000360dfbd0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000360dfbd0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x703028486d40, count: 4 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 1250 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83412703) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452f45,ffffffff8343be37,4e2,ffffffff833aaf47) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80042d8480) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ccf4010,76f51b3c000,76f51f3b000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ccf4010,fffffd806d800800,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ccf4010) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ccf4010) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a76b770,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a76b770,ffff8000360dfbd0,ffff8000360dfb20) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000360dfbd0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000360dfbd0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x703028486d40, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000360df810 rbx 0xffff800035cd4018 rdx 0 rcx 0 rax 0xffff80002a76b770 r8 0x101010101010101 r9 0x8080808080808080 r10 0x2449f0263869900 r11 0x45ba268f54089f85 r12 0 r13 0xffffffff834fa870 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff81e49965 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000360df800 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=209744 pid=36076 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=74, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a76b770 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800035cd8020,0xffff80002a76a028 process=0xffff800035cd4018 user=0xffff8000360da000, vmspace=0xfffffd806ccf4010 estcpu=24, cpticks=4, pctcpu=0.2, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 71982 330609 89209 0 2 0 syz-executor 71982 414125 89209 0 3 0x4000080 fsleep syz-executor 34917 397964 39878 0 2 0 syz-executor 34917 518487 39878 0 3 0x4000080 fsleep syz-executor 17750 293680 82845 0 2 0 syz-executor 17750 267308 82845 0 3 0x4000080 sbwait syz-executor 17750 30338 82845 0 3 0x4000080 ttyin syz-executor 98703 55577 76931 0 2 0 syz-executor 98703 92978 76931 0 3 0x4000080 msgwait syz-executor 20828 466886 33783 0 2 0 syz-executor 20828 351644 33783 0 2 0x4000000 syz-executor 20828 117661 33783 0 3 0x4000080 fsleep syz-executor 86303 271553 8141 0 2 0xc82 syz-executor 5503 503305 8141 0 2 0x2 syz-executor 76931 251926 8141 0 2 0xc82 syz-executor 33783 364094 8141 0 2 0xc82 syz-executor 82845 332781 8141 0 2 0xc82 syz-executor 39878 310416 8141 0 2 0xc82 syz-executor 47118 453414 8141 0 2 0xc82 syz-executor 89209 210893 8141 0 2 0xc82 syz-executor 8141 440591 89599 0 3 0x82 kqread syz-executor 89599 503398 60706 0 3 0x10008a sigsusp ksh 60706 206199 59274 0 3 0x98 kqread sshd-session 59274 412095 63775 0 3 0x92 kqread sshd-session 55188 375972 1 0 3 0x100083 ttyin getty 63775 133495 1 0 3 0x88 kqread sshd 2876 215068 69478 73 3 0x1100090 kqread syslogd 69478 425580 1 0 3 0x100082 sbwait syslogd 80722 214064 1 0 3 0x100080 kqread resolvd 51645 81533 82012 77 3 0x100092 kqread dhcpleased 43773 153503 82012 77 3 0x100092 kqread dhcpleased 82012 186101 1 0 3 0x80 kqread dhcpleased 67879 179263 0 0 3 0x14200 bored smr 30640 42834 0 0 2 0x14200 zerothread 66196 240944 0 0 3 0x14200 aiodoned aiodoned 43369 37971 0 0 3 0x14200 syncer update 42876 261945 0 0 3 0x14200 cleaner cleaner 26281 429855 0 0 3 0x14200 reaper reaper 86330 81426 0 0 3 0x14200 pgdaemon pagedaemon 67259 432363 0 0 3 0x14200 bored viomb 52909 156367 0 0 3 0x40014200 acpi0 acpi0 33368 73618 0 0 3 0x14200 bored softnet0 80264 241854 0 0 3 0x14200 smrbar systqmp 83898 373435 0 0 3 0x14200 bored systq 76310 219741 0 0 3 0x40014200 tmoslp softclock 12133 379164 0 0 3 0x40014200 idle0 1 71575 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 11046 12169K 12426K 166960K 12447 0 pcb 17 13K 14K 166960K 86 0 rtable 250 8K 9K 166960K 401 0 pf 40 15K 92K 166960K 84 0 ifaddr 47 8K 8K 166960K 53 0 ifgroup 59 2K 2K 166960K 65 0 sysctl 2 1K 9K 166960K 7 0 counters 37 18K 18K 166960K 44 0 ioctlops 0 0K 4K 166960K 63 0 iov 0 0K 12K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1330 84K 84K 166960K 1504 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 89K 166960K 257 0 sigio 0 0K 0K 166960K 2 0 proc 62 67K 83K 166960K 513 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 21 0 in_multi 100 7K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 366 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 212 144K 159K 166960K 3908 0 UVM aobj 13 4K 4K 166960K 14 0 pinsyscall 37 74K 93K 166960K 1351 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 13 0K 1K 166960K 32 0 temp 42 9064K 9128K 166960K 4491 0 kqueue 13 20K 26K 166960K 53 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 45 0 42 1 0 1 1 0 8 0 rtentry 136 115 0 2 4 0 4 4 0 8 0 unpcb 144 122 0 103 2 0 2 2 0 8 1 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 110 0 104 7 0 7 7 0 8 6 arp 96 19 0 0 1 0 1 1 0 8 0 inpcb 328 306 0 296 9 0 9 9 0 8 8 nd6 112 25 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 9 0 7 1 0 1 1 0 8 0 pppxif 1416 2 0 0 1 0 1 1 0 8 0 pfrktable 1344 15 0 13 1 0 1 1 0 8 0 pfsrclim 320 1 0 1 1 0 1 1 0 8 1 pfanchor 1288 6 0 4 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 2 0 2 1 0 1 1 0 8 1 pfrule 1360 4 0 3 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 461 0 0 29 0 29 29 0 8 0 art_table 40 462 0 0 5 0 5 5 0 8 0 art_node 32 115 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 11 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1786 0 328 92 0 92 92 0 8 0 ffsino 256 1786 0 328 92 0 92 92 0 8 0 nchpl 144 2156 0 463 63 0 63 63 0 8 0 vnodes 216 1969 0 0 110 0 110 110 0 8 0 namei 1024 6551 0 6551 1 0 1 1 0 8 1 pfiaddrpl 120 5 0 4 1 0 1 1 0 8 0 kstatmem 264 32 0 6 2 0 2 2 0 8 0 scxspl 216 7258 0 7258 3 0 3 3 1 8 3 plimitpl 152 85 0 64 1 0 1 1 0 8 0 sigapl 424 551 0 509 6 0 6 6 0 8 1 knotepl 120 7159 0 7112 9 0 9 9 0 8 7 kqueuepl 184 66 0 57 1 0 1 1 0 8 0 pipepl 304 196 0 169 8 0 8 8 0 8 5 fdescpl 448 538 0 510 5 0 5 5 0 8 1 filepl 120 2484 0 2268 11 0 11 11 0 8 4 lockfpl 104 45 0 43 1 0 1 1 0 8 0 lockfspl 48 23 0 21 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 203 0 191 1 0 1 1 0 8 0 zombiepl 144 511 0 509 1 0 1 1 0 8 0 processpl 1152 551 0 509 4 0 4 4 0 8 0 procpl 664 734 0 685 5 0 5 5 0 8 0 sockpl 552 488 0 456 10 0 10 10 0 8 7 mcl64k 65536 3 0 3 1 0 1 1 0 8 1 mcl16k 16384 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 71 0 71 1 0 1 1 0 8 1 mcl4k 4096 2651 0 2596 14 0 14 14 0 8 6 mcl2k 2048 296 0 296 1 0 1 1 0 8 1 mtagpl 96 6 0 4 1 0 1 1 0 8 0 mbufpl 256 5508 0 5217 19 0 19 19 0 8 0 bufpl 280 5113 0 103 358 0 358 358 0 8 0 anonpl 24 103441 0 95622 52 0 52 52 0 187 0 amapchunkpl 152 12143 0 11425 38 0 38 38 0 158 7 amappl16 200 1422 0 1397 4 0 4 4 0 8 2 amappl15 192 3 0 3 1 0 1 1 0 8 1 amappl14 184 441 0 440 1 0 1 1 0 8 0 amappl13 176 120 0 110 1 0 1 1 0 8 0 amappl12 168 778 0 750 2 0 2 2 0 8 0 amappl11 160 6 0 6 1 0 1 1 0 8 1 amappl10 152 57 0 47 1 0 1 1 0 8 0 amappl9 144 278 0 278 1 0 1 1 0 8 1 amappl8 136 169 0 167 1 0 1 1 0 8 0 amappl7 128 147 0 135 1 0 1 1 0 8 0 amappl6 120 147 0 146 1 0 1 1 0 8 0 amappl5 112 84 0 76 1 0 1 1 0 8 0 amappl4 104 250 0 235 1 0 1 1 0 8 0 amappl3 96 2157 0 2048 4 0 4 4 0 8 1 amappl2 88 513 0 457 2 0 2 2 0 8 0 amappl1 80 9600 0 9043 13 0 13 13 0 8 1 amappl 88 3199 0 3048 4 0 4 4 0 92 0 uvmvnodes 80 101 0 0 3 0 3 3 0 8 0 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 128 253 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 13 0 1 1 0 1 1 0 8 0 uaddrrnd 24 538 0 509 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 538 0 509 1 0 1 1 0 8 0 vmmpekpl 168 6134 0 6103 2 0 2 2 0 8 0 vmmpepl 168 41278 0 39507 82 0 82 82 0 357 2 vmsppl 368 537 0 509 4 0 4 4 0 8 1 rwobjpl 40 13973 0 13024 11 0 11 11 0 8 0 pdppl 4096 1082 0 1018 100 34 66 78 0 8 2 pvpl 32 272110 0 243972 241 0 241 241 0 265 7 pmappl 216 537 0 509 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 376 0 34 10 0 10 10 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(ffffffff83412703) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452f45,ffffffff8343be37,4e2,ffffffff833aaf47) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80042d8480) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ccf4010,76f51b3c000,76f51f3b000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ccf4010,fffffd806d800800,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ccf4010) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ccf4010) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a76b770,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a76b770,ffff8000360dfbd0,ffff8000360dfb20) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000360dfbd0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000360dfbd0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x703028486d40, count: -11 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83412703) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83452f45,ffffffff8343be37,4e2,ffffffff833aaf47) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80042d8480) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ccf4010,76f51b3c000,76f51f3b000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ccf4010,fffffd806d800800,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ccf4010) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ccf4010) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a76b770,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a76b770,ffff8000360dfbd0,ffff8000360dfb20) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000360dfbd0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff8000360dfbd0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x703028486d40, count: -11