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 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(fffffd8007169100) at uvm_pagedequeue+0x2cd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd807eb0e600,0,0,19) at uvn_flush+0xb8f sys/uvm/uvm_vnode.c:818 uvn_detach(fffffd807eb0e600) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff800035d09220,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_map_teardown(fffffd806ca93b98) at uvm_map_teardown+0x357 sys/uvm/uvm_map.c:2525 exit1(ffff80002a7bd770,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7bd770,ffff800035d093e0,ffff800035d09330) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800035d093e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800035d093e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7559db85b820, 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(fffffd8007169100) at uvm_pagedequeue+0x2cd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd807eb0e600,0,0,19) at uvn_flush+0xb8f sys/uvm/uvm_vnode.c:818 uvn_detach(fffffd807eb0e600) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff800035d09220,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_map_teardown(fffffd806ca93b98) at uvm_map_teardown+0x357 sys/uvm/uvm_map.c:2525 exit1(ffff80002a7bd770,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7bd770,ffff800035d093e0,ffff800035d09330) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800035d093e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800035d093e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7559db85b820, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800035d08f30 rbx 0x1 rdx 0 rcx 0 rax 0xffff80002a7bd770 r8 0x101010101010101 r9 0x8080808080808080 r10 0x65734a75c9c0f217 r11 0x8a563969a53590c9 r12 0 r13 0x1 r14 0 r15 0x1 rip 0xffffffff820dbab5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800035d08f20 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=323605 pid=19249 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a7bd770 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c97d4e8,0xffff80003c97cfc8 process=0xffff8000ffffb618 user=0xffff800035d04000, vmspace=0xfffffd806ca93b98 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 37182 399258 61066 0 2 0 syz-executor 37182 378910 61066 0 3 0x4000080 fsleep syz-executor 60298 502988 23721 0 2 0 syz-executor 60298 7337 23721 0 3 0x4000080 fsleep syz-executor 13261 370653 17235 0 2 0 syz-executor 13261 223918 17235 0 3 0x4000080 fsleep syz-executor 13261 158247 17235 0 3 0x4000080 fsleep syz-executor 77964 431957 57297 0 2 0 syz-executor 77964 320851 57297 0 3 0x4000080 kqpoll syz-executor 5715 517766 30787 0 2 0 syz-executor 5715 199166 30787 0 3 0x4000080 fsleep syz-executor 70279 151456 85116 -1 3 0x400090 nanoslp syz-executor 70279 82409 85116 -1 3 0x4400090 kqsel syz-executor 70279 18894 85116 -1 3 0x4400090 fsleep syz-executor 92271 421028 1 0 3 0x100083 ttyin getty 38790 83671 0 0 3 0x14200 acct acct 77829 235822 28758 0 3 0x82 nanoslp syz-executor 57297 383344 28758 0 3 0x82 nanoslp syz-executor 17235 272262 28758 0 3 0x82 nanoslp syz-executor 30787 448559 28758 0 3 0x82 nanoslp syz-executor 37386 413638 28758 0 2 0x2 syz-executor 23721 200517 28758 0 3 0x82 nanoslp syz-executor 85116 83054 28758 0 3 0x82 nanoslp syz-executor 61066 424666 28758 0 3 0x82 nanoslp syz-executor 28758 186936 70985 0 3 0x82 kqread syz-executor 70985 358689 78378 0 3 0x10008a sigsusp ksh 78378 44302 8883 0 3 0x98 kqread sshd-session 8883 218663 98985 0 3 0x92 kqread sshd-session 98985 498329 1 0 3 0x88 kqread sshd 5157 453706 77822 73 3 0x1100090 kqread syslogd 77822 367331 1 0 3 0x100082 sbwait syslogd 3532 35654 1 0 3 0x100080 kqread resolvd 71246 278787 46985 77 3 0x100092 kqread dhcpleased 60518 59353 46985 77 3 0x100092 kqread dhcpleased 46985 167163 1 0 3 0x80 kqread dhcpleased 56986 404971 0 0 3 0x14200 bored smr 33968 170881 0 0 2 0x14200 zerothread 28879 136770 0 0 3 0x14200 aiodoned aiodoned 8616 170364 0 0 3 0x14200 syncer update 71652 484226 0 0 3 0x14200 cleaner cleaner 45379 8867 0 0 3 0x14200 reaper reaper 81839 277669 0 0 3 0x14200 pgdaemon pagedaemon 89911 80244 0 0 3 0x14200 bored viomb 73797 213238 0 0 3 0x40014200 acpi0 acpi0 79075 352355 0 0 3 0x14200 bored softnet0 70504 211273 0 0 3 0x14200 bored systqmp 87932 509899 0 0 3 0x14200 bored systq 41017 245952 0 0 3 0x40014200 tmoslp softclock 41247 474221 0 0 3 0x40014200 idle0 1 239960 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 10179 11115K 11428K 166960K 12155 0 pcb 17 14K 15K 166960K 101 0 rtable 260 9K 10K 166960K 948 0 pf 32 13K 16K 166960K 71 0 ifaddr 42 7K 7K 166960K 59 0 ifgroup 50 2K 2K 166960K 81 0 sysctl 1 1K 9K 166960K 8 0 counters 33 17K 18K 166960K 51 0 ioctlops 0 0K 4K 166960K 122 0 iov 0 0K 16K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1342 84K 85K 166960K 1858 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 16 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 236K 166960K 634 0 sigio 0 0K 0K 166960K 11 0 proc 60 59K 100K 166960K 520 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 218 0 in_multi 99 7K 7K 166960K 144 0 ether_multi 1 0K 0K 166960K 19 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 402 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 219 152K 168K 166960K 7050 0 UVM aobj 87 7K 9K 166960K 98 0 pinsyscall 37 74K 94K 166960K 1747 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 29 0 NDP 11 0K 2K 166960K 38 0 temp 55 8667K 8733K 166960K 18630 0 kqueue 15 24K 30K 166960K 125 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 120 179 0 175 3 0 3 3 0 8 2 rtentry 136 315 0 203 4 0 4 4 0 8 0 unpcb 144 399 0 384 2 0 2 2 0 8 1 syncache 336 10 0 10 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 252 0 245 7 0 7 7 0 8 6 arp 96 84 0 67 1 0 1 1 0 8 0 ipq 40 3 0 3 1 0 1 1 0 8 1 ipqe 40 6 0 6 1 0 1 1 0 8 1 inpcb 328 789 0 777 15 4 11 15 0 8 8 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 112 28 0 2 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1072 15 0 15 1 0 1 1 0 8 1 pppxif 1384 1 0 1 1 0 1 1 0 8 1 pfstscr 40 2 0 1 1 0 1 1 0 8 0 pfrktable 1344 1 0 1 1 0 1 1 0 8 1 pfstitem 24 3 0 0 1 0 1 1 0 8 0 pfstkey 128 9 0 6 1 0 1 1 0 8 0 pfstate 384 7 0 5 1 0 1 1 0 8 0 pfrule 1344 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 556 0 87 33 0 33 33 0 8 3 art_table 40 558 0 87 6 0 6 6 0 8 0 art_node 32 315 0 213 3 0 3 3 0 8 1 sysvmsgpl 40 10 0 5 1 0 1 1 0 8 0 semapl 112 11 0 1 1 0 1 1 0 8 0 shmpl 112 89 0 7 3 0 3 3 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2524 0 1026 95 0 95 95 0 8 0 ffsino 256 2524 0 1026 95 0 95 95 0 8 0 nchpl 144 3354 0 1665 64 0 64 64 0 8 1 rtmask 32 3 0 3 1 0 1 1 0 8 1 vnodes 216 2862 0 0 159 0 159 159 0 8 0 namei 1024 11059 0 11059 1 0 1 1 0 8 1 vcpupl 3904 2 0 0 1 0 1 1 0 8 0 vmpool 808 6 0 4 1 0 1 1 0 8 0 kstatmem 264 44 0 22 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 11 0 11 1 0 1 1 0 8 1 scxspl 216 10204 0 10204 8 0 8 8 1 8 8 plimitpl 152 274 0 257 1 0 1 1 0 8 0 sigapl 424 920 0 877 6 0 6 6 0 8 0 knotepl 120 21350 0 21297 10 0 10 10 0 8 8 kqueuepl 184 173 0 160 1 0 1 1 0 8 0 pipepl 304 169 0 141 3 0 3 3 0 8 0 fdescpl 448 906 0 878 5 0 5 5 0 8 1 filepl 120 5205 0 4991 15 0 15 15 0 8 7 lockfpl 104 667 0 664 4 0 4 4 0 8 3 lockfspl 48 96 0 93 1 0 1 1 0 8 0 sessionpl 144 30 0 22 1 0 1 1 0 8 0 pgrppl 48 51 0 35 1 0 1 1 0 8 0 ucredpl 104 719 0 706 1 0 1 1 0 8 0 zombiepl 144 878 0 877 1 0 1 1 0 8 0 processpl 1152 920 0 877 4 0 4 4 0 8 0 procpl 664 1605 0 1554 6 0 6 6 0 8 1 sosppl 176 6 0 5 1 0 1 1 0 8 0 sockpl 552 1416 0 1385 14 2 12 14 0 8 8 mcl64k 65536 134 0 134 1 0 1 1 0 8 1 mcl16k 16384 9 0 9 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 13 0 13 1 0 1 1 0 8 1 mcl4k 4096 3204 0 3149 15 0 15 15 0 8 7 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 1331 0 1294 10 0 10 10 0 8 5 mtagpl 96 115 0 6 3 0 3 3 0 8 0 mbufpl 256 10963 0 10610 30 0 30 30 0 8 0 bufpl 280 3068 0 120 211 0 211 211 0 8 0 anonpl 24 115125 0 112096 45 0 45 45 0 187 22 amapchunkpl 152 22334 0 21889 32 0 32 32 0 158 12 amappl16 200 1234 0 1206 11 1 10 11 0 8 8 amappl15 192 3 0 3 1 0 1 1 0 8 1 amappl13 176 427 0 426 1 0 1 1 0 8 0 amappl12 168 1275 0 1237 2 0 2 2 0 8 0 amappl11 160 69 0 68 1 0 1 1 0 8 0 amappl10 152 38 0 28 1 0 1 1 0 8 0 amappl9 144 257 0 257 1 0 1 1 0 8 1 amappl8 136 15 0 14 1 0 1 1 0 8 0 amappl7 128 75 0 74 1 0 1 1 0 8 0 amappl6 120 271 0 259 1 0 1 1 0 8 0 amappl5 112 78 0 70 1 0 1 1 0 8 0 amappl4 104 420 0 396 1 0 1 1 0 8 0 amappl3 96 4450 0 4351 3 0 3 3 0 8 0 amappl2 88 593 0 538 2 0 2 2 0 8 0 amappl1 80 13480 0 12947 15 0 15 15 0 8 2 amappl 88 6202 0 6052 5 0 5 5 0 92 0 uvmvnodes 80 113 0 0 3 0 3 3 0 8 0 dma4096 4096 2 0 2 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 128 261 0 261 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 97 0 11 2 0 2 2 0 8 0 uaddrrnd 24 906 0 878 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 906 0 878 1 0 1 1 0 8 0 vmmpekpl 168 9288 0 9257 2 0 2 2 0 8 0 vmmpepl 168 65445 0 63722 92 0 92 92 0 357 11 vmsppl 368 905 0 877 4 0 4 4 0 8 1 rwobjpl 40 19676 0 18651 12 0 12 12 0 8 0 pdppl 4096 1830 0 1764 106 36 70 82 0 8 4 pvpl 32 379726 0 371516 108 0 108 108 0 265 23 pmappl 216 911 0 881 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 414 0 36 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(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(fffffd8007169100) at uvm_pagedequeue+0x2cd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd807eb0e600,0,0,19) at uvn_flush+0xb8f sys/uvm/uvm_vnode.c:818 uvn_detach(fffffd807eb0e600) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff800035d09220,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_map_teardown(fffffd806ca93b98) at uvm_map_teardown+0x357 sys/uvm/uvm_map.c:2525 exit1(ffff80002a7bd770,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7bd770,ffff800035d093e0,ffff800035d09330) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800035d093e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800035d093e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7559db85b820, 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(fffffd8007169100) at uvm_pagedequeue+0x2cd sys/uvm/uvm_page.c:1324 uvn_flush(fffffd807eb0e600,0,0,19) at uvn_flush+0xb8f sys/uvm/uvm_vnode.c:818 uvn_detach(fffffd807eb0e600) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344 uvm_unmap_detach(ffff800035d09220,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1364 uvm_map_teardown(fffffd806ca93b98) at uvm_map_teardown+0x357 sys/uvm/uvm_map.c:2525 exit1(ffff80002a7bd770,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7bd770,ffff800035d093e0,ffff800035d09330) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800035d093e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800035d093e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7559db85b820, count: -12