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(ffffffff834155d9) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834523c8,ffffffff8343d212,4e2,ffffffff833ac1b0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800788d100) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd800e11d5d8,229540a2000,229544a1000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd800e11d5d8,fffffd806ccdcb98,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd800e11d5d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd800e11d5d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000338ce2b8,0,4,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sigexit(ffff8000338ce2b8,4) at sigexit+0x115 trapsignal(ffff8000338ce2b8,b,6,2,7712bf4e71f0) at trapsignal+0x85b sys/kern/kern_sig.c:873 upageflttrap(ffff80002ccbbb80,7712bf4e71f0) at upageflttrap+0x25d sys/arch/amd64/amd64/trap.c:218 usertrap(ffff80002ccbbb80) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7712bf4e7220, 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 "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(ffffffff834155d9) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834523c8,ffffffff8343d212,4e2,ffffffff833ac1b0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800788d100) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd800e11d5d8,229540a2000,229544a1000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd800e11d5d8,fffffd806ccdcb98,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd800e11d5d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd800e11d5d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000338ce2b8,0,4,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sigexit(ffff8000338ce2b8,4) at sigexit+0x115 trapsignal(ffff8000338ce2b8,b,6,2,7712bf4e71f0) at trapsignal+0x85b sys/kern/kern_sig.c:873 upageflttrap(ffff80002ccbbb80,7712bf4e71f0) at upageflttrap+0x25d sys/arch/amd64/amd64/trap.c:218 usertrap(ffff80002ccbbb80) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7712bf4e7220, count: -13 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002ccbb660 rbx 0xffff8000ffffb618 rdx 0 rcx 0 rax 0xffff8000338ce2b8 r8 0x101010101010101 r9 0x8080808080808080 r10 0x59b85962871a86cb r11 0x5a4fb7e35d6167c8 r12 0 r13 0xffffffff83695f00 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff82c71ac5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002ccbb650 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=237018 pid=63288 tcnt=0 stat=onproc flags process=1808 proc=2000 runpri=0, usrpri=72, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000338ce2b8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000338ce020,0xffff80002f0bc800 process=0xffff8000ffffb618 user=0xffff80002ccb6000, vmspace=0xfffffd800e11d5d8 estcpu=22, cpticks=7, pctcpu=0.4, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 34060 511671 93095 0 3 0x3000 suspend syz-executor 34060 488060 93095 0 2 0x4081000 syz-executor 34060 181759 93095 0 3 0x4081000 inode syz-executor 45956 119324 35584 0 3 0x82 nanoslp syz-executor 30123 287216 35584 0 3 0x82 nanoslp syz-executor 28358 344519 35584 0 2 0x2 syz-executor 70466 215641 35584 0 2 0x2 syz-executor 48949 16541 35584 0 3 0x82 wait syz-executor 44488 89335 35584 0 2 0x2 syz-executor 93095 143974 35584 0 2 0xc82 syz-executor 52177 270448 35584 0 2 0x2 syz-executor 35584 406710 55965 0 3 0x82 kqread syz-executor 55965 424483 34585 0 3 0x10008a sigsusp ksh 34585 6956 4074 0 3 0x98 kqread sshd-session 4074 377712 49990 0 3 0x92 kqread sshd-session 23269 124985 1 0 3 0x100083 ttyin getty 49990 505632 1 0 3 0x88 kqread sshd 63109 374349 36994 73 3 0x1100090 kqread syslogd 36994 441308 1 0 3 0x100082 sbwait syslogd 79174 92986 1 0 3 0x100080 kqread resolvd 48601 164817 6510 77 3 0x100092 kqread dhcpleased 74495 479158 6510 77 3 0x100092 kqread dhcpleased 6510 14151 1 0 3 0x80 kqread dhcpleased 83110 491527 0 0 3 0x14200 bored smr 39469 116700 0 0 2 0x14200 zerothread 4519 494253 0 0 3 0x14200 aiodoned aiodoned 63456 329461 0 0 3 0x14200 syncer update 39014 290232 0 0 3 0x14200 cleaner cleaner 53586 481925 0 0 3 0x14200 reaper reaper 19359 264007 0 0 3 0x14200 pgdaemon pagedaemon 36357 60547 0 0 3 0x14200 bored viomb 35511 231647 0 0 3 0x40014200 acpi0 acpi0 46548 174409 0 0 3 0x14200 bored softnet0 31897 202712 0 0 3 0x14200 bored systqmp 5554 233014 0 0 3 0x14200 bored systq 70241 149795 0 0 3 0x40014200 tmoslp softclock 48171 44304 0 0 3 0x40014200 idle0 1 115491 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 11043 12178K 12274K 166960K 12283 0 pcb 17 12K 12K 166960K 43 0 rtable 235 8K 8K 166960K 395 0 pf 31 13K 14K 166960K 47 0 ifaddr 41 7K 7K 166960K 49 0 ifgroup 53 2K 2K 166960K 67 0 sysctl 1 1K 9K 166960K 5 0 counters 33 17K 18K 166960K 38 0 ioctlops 0 0K 4K 166960K 94 0 iov 0 0K 12K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1298 82K 82K 166960K 1480 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 10 0K 0K 166960K 18 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 12 41K 93K 166960K 276 0 proc 60 59K 91K 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 11 0 in_multi 96 7K 7K 166960K 100 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 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 378 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 199 160K 173K 166960K 4214 0 UVM aobj 7 4K 4K 166960K 7 0 pinsyscall 34 68K 94K 166960K 1347 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 11 0K 2K 166960K 31 0 temp 44 9068K 9132K 166960K 7928 0 kqueue 13 20K 26K 166960K 57 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 53 0 50 1 0 1 1 0 8 0 rtentry 136 115 0 13 4 0 4 4 0 8 0 unpcb 144 106 0 90 1 0 1 1 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 41 0 37 1 0 1 1 0 8 0 arp 96 18 0 0 1 0 1 1 0 8 0 ipq 40 2 0 0 1 0 1 1 0 8 0 ipqe 40 2 0 0 1 0 1 1 0 8 0 inpcb 328 135 0 128 3 1 2 2 0 8 1 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 4 0 4 1 1 0 1 0 8 0 nd6 112 26 0 0 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 3 0 3 1 1 0 1 0 8 0 pppxif 1416 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 462 0 47 29 0 29 29 0 8 1 art_table 40 464 0 47 5 0 5 5 0 8 0 art_node 32 115 0 23 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 15 0 7 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 24 0 7 3 0 3 3 0 8 0 dino2pl 256 1837 0 380 92 0 92 92 0 8 0 ffsino 256 1837 0 380 92 0 92 92 0 8 0 nchpl 144 2227 0 532 64 0 64 64 0 8 0 vnodes 216 1988 0 0 111 0 111 111 0 8 0 namei 1024 7232 0 7230 3 2 1 2 0 8 0 kstatmem 264 30 0 8 2 0 2 2 0 8 0 scxspl 216 7420 0 7420 9 7 2 8 1 8 2 plimitpl 152 86 0 69 1 0 1 1 0 8 0 sigapl 424 563 0 524 6 1 5 6 0 8 0 knotepl 120 8334 0 8287 16 7 9 9 0 8 7 kqueuepl 184 69 0 60 1 0 1 1 0 8 0 pipepl 304 127 0 100 3 0 3 3 0 8 0 fdescpl 448 550 0 525 5 1 4 5 0 8 0 filepl 120 2536 0 2325 10 2 8 9 0 8 0 lockfpl 104 94 0 92 1 0 1 1 0 8 0 lockfspl 48 41 0 39 1 0 1 1 0 8 0 sessionpl 144 21 0 13 1 0 1 1 0 8 0 pgrppl 48 30 0 14 1 0 1 1 0 8 0 ucredpl 104 227 0 215 1 0 1 1 0 8 0 zombiepl 144 528 0 524 1 0 1 1 0 8 0 processpl 1152 563 0 524 4 0 4 4 0 8 0 procpl 664 788 0 747 6 0 6 6 0 8 1 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 552 300 0 274 3 0 3 3 0 8 0 mcl64k 65536 9 0 9 2 1 1 1 0 8 1 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl12k 12288 1 0 1 1 1 0 1 0 8 0 mcl9k 9216 1 0 1 1 1 0 1 0 8 0 mcl8k 8192 5 0 5 1 1 0 1 0 8 0 mcl4k 4096 2689 0 2638 16 8 8 15 0 8 1 mcl2k 2048 260 0 260 4 2 2 2 0 8 2 mtagpl 96 5 0 5 1 1 0 1 0 8 0 mbufpl 256 5449 0 5308 11 0 11 11 0 8 0 bufpl 280 4974 0 103 348 0 348 348 0 8 0 anonpl 24 118893 0 111151 73 24 49 49 0 187 0 amapchunkpl 152 12784 0 12128 37 7 30 30 0 158 0 amappl16 200 2219 0 2195 14 12 2 14 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 405 0 404 1 0 1 1 0 8 0 amappl13 176 111 0 101 1 0 1 1 0 8 0 amappl12 168 790 0 765 2 0 2 2 0 8 0 amappl11 160 19 0 19 1 1 0 1 0 8 0 amappl10 152 98 0 88 1 0 1 1 0 8 0 amappl9 144 272 0 271 1 0 1 1 0 8 0 amappl8 136 124 0 123 1 0 1 1 0 8 0 amappl7 128 140 0 129 1 0 1 1 0 8 0 amappl6 120 151 0 149 1 0 1 1 0 8 0 amappl5 112 90 0 83 1 0 1 1 0 8 0 amappl4 104 253 0 237 1 0 1 1 0 8 0 amappl3 96 2319 0 2227 3 0 3 3 0 8 0 amappl2 88 492 0 438 2 0 2 2 0 8 0 amappl1 80 9409 0 8865 13 1 12 13 0 8 0 amappl 88 3522 0 3387 5 0 5 5 0 92 1 uvmvnodes 80 100 0 0 3 0 3 3 0 8 0 dma8192 8192 1 0 1 1 0 1 1 0 8 1 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 550 0 524 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 550 0 524 1 0 1 1 0 8 0 vmmpekpl 168 5979 0 5947 2 0 2 2 0 8 0 vmmpepl 168 42531 0 40926 90 9 81 89 0 357 2 vmsppl 368 549 0 524 4 1 3 4 0 8 0 rwobjpl 40 14912 0 13988 12 1 11 12 0 8 0 pdppl 4096 1106 0 1048 94 28 66 80 0 8 8 pvpl 32 286884 0 259941 267 36 231 231 0 265 2 pmappl 216 549 0 524 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 365 0 48 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(ffffffff834155d9) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834523c8,ffffffff8343d212,4e2,ffffffff833ac1b0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800788d100) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd800e11d5d8,229540a2000,229544a1000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd800e11d5d8,fffffd806ccdcb98,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd800e11d5d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd800e11d5d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000338ce2b8,0,4,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sigexit(ffff8000338ce2b8,4) at sigexit+0x115 trapsignal(ffff8000338ce2b8,b,6,2,7712bf4e71f0) at trapsignal+0x85b sys/kern/kern_sig.c:873 upageflttrap(ffff80002ccbbb80,7712bf4e71f0) at upageflttrap+0x25d sys/arch/amd64/amd64/trap.c:218 usertrap(ffff80002ccbbb80) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7712bf4e7220, 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(ffffffff834155d9) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff834523c8,ffffffff8343d212,4e2,ffffffff833ac1b0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd800788d100) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd800e11d5d8,229540a2000,229544a1000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd800e11d5d8,fffffd806ccdcb98,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd800e11d5d8) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd800e11d5d8) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000338ce2b8,0,4,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sigexit(ffff8000338ce2b8,4) at sigexit+0x115 trapsignal(ffff8000338ce2b8,b,6,2,7712bf4e71f0) at trapsignal+0x85b sys/kern/kern_sig.c:873 upageflttrap(ffff80002ccbbb80,7712bf4e71f0) at upageflttrap+0x25d sys/arch/amd64/amd64/trap.c:218 usertrap(ffff80002ccbbb80) at usertrap+0x413 sys/arch/amd64/amd64/trap.c:640 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7712bf4e7220, count: -13