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(ffffffff83484c17) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c259f,ffffffff834aef56,4e2,ffffffff8341d037) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80075eea00) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ca9ed00,dfd3c694000,dfd3c695000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ca9ed00,fffffd806afba658,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ca9ed00) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ca9ed00) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a77cd10,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a77cd10,ffff80002ccabae0,ffff80002ccaba30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ccabae0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002ccabae0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x704edaa8bb20, 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(ffffffff83484c17) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c259f,ffffffff834aef56,4e2,ffffffff8341d037) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80075eea00) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ca9ed00,dfd3c694000,dfd3c695000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ca9ed00,fffffd806afba658,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ca9ed00) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ca9ed00) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a77cd10,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a77cd10,ffff80002ccabae0,ffff80002ccaba30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ccabae0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002ccabae0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x704edaa8bb20, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002ccab720 rbx 0xffff8000ffffad18 rdx 0 rcx 0 rax 0xffff80002a77cd10 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb98e64b8cecb0746 r11 0x9af1b6574ecaef05 r12 0 r13 0xffffffff836b9250 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff82eca335 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002ccab710 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=211849 pid=95602 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a77cd10 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c8fba10,0xffff80002a77c028 process=0xffff8000ffffad18 user=0xffff80002cca6000, vmspace=0xfffffd806ca9ed00 estcpu=1, cpticks=8, pctcpu=0.0, user=0, sys=3, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 51879 22196 61838 0 2 0x2 syz-executor 91235 45969 99265 0 2 0 syz-executor 91235 302213 99265 0 2 0x4000000 syz-executor 70486 498285 33070 -1 2 0x11 syz-executor 70486 270816 33070 -1 3 0x4000091 ttyout syz-executor 70486 313874 33070 -1 3 0x4000091 fsleep syz-executor 46452 317217 89029 0 2 0 syz-executor 46452 239405 89029 0 3 0x4000080 kqread syz-executor 46452 490036 89029 0 3 0x4000080 fsleep syz-executor 12051 430115 42618 0 2 0 syz-executor 12051 230175 42618 0 3 0x4000080 fsleep syz-executor 19918 265526 71721 0 2 0xc80 syz-executor 19918 90322 71721 0 2 0x4000000 syz-executor 19918 22573 71721 0 3 0x4000080 fsleep syz-executor 92565 208021 72816 0 3 0x3000 suspend syz-executor 92565 147571 72816 0 2 0x4081000 syz-executor 71721 298484 61838 0 2 0xc82 syz-executor 10500 320396 61838 0 2 0xc82 syz-executor 89029 231183 61838 0 2 0xc82 syz-executor 42618 44873 61838 0 2 0xc82 syz-executor 99265 386366 61838 0 2 0xc82 syz-executor 33070 459911 61838 0 2 0xc82 syz-executor 72816 91048 61838 0 3 0x82 wait syz-executor 61838 511784 22434 0 2 0x2 syz-executor 22434 150325 47356 0 3 0x10008a sigsusp ksh 47356 451546 65152 0 3 0x98 kqread sshd-session 65152 102056 35137 0 3 0x92 kqread sshd-session 81188 247497 1 0 3 0x100083 ttyin getty 35137 372103 1 0 3 0x88 kqread sshd 85176 68928 86835 73 2 0x1100090 syslogd 86835 507814 1 0 3 0x100082 sbwait syslogd 38653 209463 1 0 3 0x100080 kqread resolvd 67067 383093 26786 77 3 0x100092 kqread dhcpleased 46513 17193 26786 77 3 0x100092 kqread dhcpleased 26786 434852 1 0 3 0x80 kqread dhcpleased 29750 443929 0 0 3 0x14200 bored smr 47508 80439 0 0 2 0x14200 zerothread 12962 17196 0 0 3 0x14200 aiodoned aiodoned 7728 398532 0 0 3 0x14200 syncer update 27151 296503 0 0 3 0x14200 cleaner cleaner 40855 96920 0 0 3 0x14200 reaper reaper 75178 120828 0 0 3 0x14200 pgdaemon pagedaemon 34486 503599 0 0 3 0x14200 bored viomb 29838 269869 0 0 3 0x40014200 acpi0 acpi0 49446 263609 0 0 3 0x14200 bored softnet0 75507 111647 0 0 3 0x14200 smrbar systqmp 86618 332642 0 0 3 0x14200 bored systq 49204 60865 0 0 3 0x40014200 tmoslp softclock 34918 282529 0 0 3 0x40014200 idle0 1 520873 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 11041 12232K 12234K 166960K 12141 0 pcb 17 12K 12K 166960K 22 0 rtable 221 7K 7K 166960K 430 0 pf 28 12K 13K 166960K 38 0 ifaddr 38 6K 7K 166960K 49 0 ifgroup 46 2K 2K 166960K 61 0 sysctl 1 1K 9K 166960K 6 0 counters 32 17K 18K 166960K 40 0 ioctlops 0 0K 4K 166960K 41 0 iov 0 0K 4K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1293 81K 81K 166960K 1440 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 54K 89K 166960K 168 0 proc 59 59K 83K 166960K 500 0 subproc 63 3K 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 33 0 in_multi 88 6K 7K 166960K 101 0 ether_multi 1 0K 0K 166960K 1 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 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 376 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 216 144K 158K 166960K 3273 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 37 74K 92K 166960K 1280 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 2 0 NDP 10 0K 2K 166960K 30 0 temp 30 9105K 9122K 166960K 3690 0 kqueue 14 20K 24K 166960K 32 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 39 0 36 1 0 1 1 0 8 0 rtentry 136 114 0 14 4 0 4 4 0 8 0 unpcb 144 47 0 31 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 48 0 44 4 0 4 4 0 8 3 arp 96 18 0 2 1 0 1 1 0 8 0 inpcb 328 115 0 106 4 0 4 4 0 8 2 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 25 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 1 1 0 1 1 0 8 0 ppxss 1072 5 0 5 1 0 1 1 0 8 1 pppxif 1416 2 0 2 1 0 1 1 0 8 1 pfrule 1360 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 461 0 6 29 0 29 29 0 8 0 art_table 40 462 0 6 5 0 5 5 0 8 0 art_node 32 114 0 13 1 0 1 1 0 8 0 semapl 72 1 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1670 0 209 92 0 92 92 0 8 0 ffsino 256 1670 0 209 92 0 92 92 0 8 0 nchpl 144 1920 0 226 63 0 63 63 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 1766 0 0 99 0 99 99 0 8 0 namei 1024 5834 0 5834 2 0 2 2 0 8 2 kstatmem 264 29 0 8 2 0 2 2 0 8 0 scxspl 216 6494 0 6494 4 0 4 4 1 8 4 plimitpl 152 36 0 20 1 0 1 1 0 8 0 sigapl 424 466 0 424 6 0 6 6 0 8 1 knotepl 120 3110 0 3062 2 0 2 2 0 8 0 kqueuepl 184 35 0 25 1 0 1 1 0 8 0 pipepl 304 128 0 101 3 0 3 3 0 8 0 fdescpl 448 453 0 425 5 0 5 5 0 8 1 filepl 120 1964 0 1759 12 0 12 12 0 8 4 lockfpl 104 15 0 12 1 0 1 1 0 8 0 lockfspl 48 9 0 6 1 0 1 1 0 8 0 sessionpl 144 28 0 18 1 0 1 1 0 8 0 pgrppl 48 37 0 19 1 0 1 1 0 8 0 ucredpl 104 318 0 306 1 0 1 1 0 8 0 zombiepl 144 425 0 424 1 0 1 1 0 8 0 processpl 1152 466 0 424 4 0 4 4 0 8 0 procpl 664 521 0 470 5 0 5 5 0 8 0 sockpl 552 235 0 207 5 0 5 5 0 8 2 mcl64k 65536 4 0 4 1 0 1 1 0 8 1 mcl16k 16384 3 0 3 1 0 1 1 0 8 1 mcl8k 8192 4 0 4 1 0 1 1 0 8 1 mcl4k 4096 2531 0 2476 14 0 14 14 0 8 6 mcl2k 2048 167 0 166 2 0 2 2 0 8 1 mtagpl 96 4 0 4 1 0 1 1 0 8 1 mbufpl 256 4901 0 4766 25 0 25 25 0 8 15 bufpl 280 4977 0 105 348 0 348 348 0 8 0 anonpl 24 104137 0 96232 50 0 50 50 0 186 0 amapchunkpl 152 9336 0 8609 30 0 30 30 0 158 0 amappl16 200 1977 0 1955 15 3 12 15 0 8 8 amappl15 192 8 0 8 1 0 1 1 0 8 1 amappl14 184 417 0 415 1 0 1 1 0 8 0 amappl13 176 118 0 108 1 0 1 1 0 8 0 amappl12 168 708 0 681 2 0 2 2 0 8 0 amappl11 160 26 0 26 1 0 1 1 0 8 1 amappl10 152 60 0 50 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 0 1 1 0 8 1 amappl8 136 99 0 97 1 0 1 1 0 8 0 amappl7 128 139 0 128 1 0 1 1 0 8 0 amappl6 120 160 0 158 1 0 1 1 0 8 0 amappl5 112 99 0 92 1 0 1 1 0 8 0 amappl4 104 259 0 246 1 0 1 1 0 8 0 amappl3 96 1620 0 1511 3 0 3 3 0 8 0 amappl2 88 532 0 478 2 0 2 2 0 8 0 amappl1 80 10170 0 9625 13 0 13 13 0 8 1 amappl 88 2568 0 2412 4 0 4 4 0 92 0 uvmvnodes 80 99 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 453 0 424 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 453 0 424 1 0 1 1 0 8 0 vmmpekpl 168 5624 0 5581 2 0 2 2 0 8 0 vmmpepl 168 38650 0 36918 90 0 90 90 0 357 10 vmsppl 368 452 0 424 4 0 4 4 0 8 1 rwobjpl 40 14633 0 13708 13 0 13 13 0 8 0 pdppl 4096 912 0 848 92 24 68 78 0 8 4 pvpl 32 248900 0 229280 235 0 235 235 0 265 65 pmappl 216 452 0 424 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 373 0 24 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(ffffffff83484c17) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c259f,ffffffff834aef56,4e2,ffffffff8341d037) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80075eea00) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ca9ed00,dfd3c694000,dfd3c695000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ca9ed00,fffffd806afba658,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ca9ed00) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ca9ed00) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a77cd10,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a77cd10,ffff80002ccabae0,ffff80002ccaba30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ccabae0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002ccabae0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x704edaa8bb20, 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(ffffffff83484c17) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834c259f,ffffffff834aef56,4e2,ffffffff8341d037) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80075eea00) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806ca9ed00,dfd3c694000,dfd3c695000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806ca9ed00,fffffd806afba658,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806ca9ed00) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806ca9ed00) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80002a77cd10,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a77cd10,ffff80002ccabae0,ffff80002ccaba30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ccabae0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002ccabae0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x704edaa8bb20, count: -11