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(ffffffff83380374) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833bb0e9,ffffffff833a0de0,4e2,ffffffff8330db96) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8006c86480) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c982b90,9260c01b000,9260c01c000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c982b90,fffffd806caefaa0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860 uvm_map_teardown(fffffd806c982b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c982b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491 exit1(ffff800033905250,0,0,3) at exit1+0x6e6 sys/kern/kern_exit.c:259 proc_suspend_check_locked(ffff800033905250,0) at proc_suspend_check_locked+0x4ba sys/kern/kern_sig.c:2235 userret(ffff800033905250) at userret+0x8c proc_suspend_check sys/kern/kern_sig.c:-1 [inline] userret(ffff800033905250) at userret+0x8c sys/kern/kern_sig.c:2194 syscall(ffff8000338ff930) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff8000338ff930) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7608620d9080, 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 1250 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83380374) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833bb0e9,ffffffff833a0de0,4e2,ffffffff8330db96) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8006c86480) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c982b90,9260c01b000,9260c01c000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c982b90,fffffd806caefaa0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860 uvm_map_teardown(fffffd806c982b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c982b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491 exit1(ffff800033905250,0,0,3) at exit1+0x6e6 sys/kern/kern_exit.c:259 proc_suspend_check_locked(ffff800033905250,0) at proc_suspend_check_locked+0x4ba sys/kern/kern_sig.c:2235 userret(ffff800033905250) at userret+0x8c proc_suspend_check sys/kern/kern_sig.c:-1 [inline] userret(ffff800033905250) at userret+0x8c sys/kern/kern_sig.c:2194 syscall(ffff8000338ff930) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff8000338ff930) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7608620d9080, count: -12 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000338ff4c0 rbx 0x3 rdx 0 rcx 0 rax 0xffff800033905250 r8 0x101010101010101 r9 0x8080808080808080 r10 0x86f1b4379eb9738a r11 0x53a19c019232782d r12 0 r13 0xffffffff83439620 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff827bfe95 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000338ff4b0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=42645 pid=58420 tcnt=0 stat=onproc flags process=1008 proc=82000 runpri=17, usrpri=76, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000339042c0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800038522fc0,0xffff80002a7bca90 process=0xffff8000ffff9b20 user=0xffff8000338fa000, vmspace=0xfffffd806c982b90 estcpu=26, cpticks=50, pctcpu=0.32, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 30869 360642 13516 -1 2 0x10 syz-executor 30869 313407 13516 -1 3 0x4000090 fsleep syz-executor 67854 18957 22871 0 2 0 syz-executor 67854 333221 22871 0 2 0x4000000 syz-executor 67854 93490 22871 0 2 0x4000000 syz-executor 45306 28833 22850 0 2 0 syz-executor 45306 366882 22850 0 3 0x4000080 fsleep syz-executor 45306 113752 22850 0 3 0x4000080 fsleep syz-executor 39486 21177 43610 0 2 0 syz-executor 39486 112101 43610 0 2 0x4000000 syz-executor 39486 375200 43610 0 2 0x4000000 syz-executor 44315 518416 33148 0 2 0 syz-executor 44315 152463 33148 0 3 0x4000080 fsleep syz-executor 37554 393868 30073 0 2 0x1 syz-executor 37554 371060 30073 0 3 0x4000080 fsleep syz-executor 46136 104934 65041 0 3 0x82 wait syz-executor 42680 410604 1 0 3 0x100083 ttyin getty 1023 274352 0 0 3 0x14280 nfsidl nfsio 56894 506285 0 0 3 0x14280 nfsidl nfsio 45309 248649 0 0 3 0x14280 nfsidl nfsio 6900 493439 0 0 3 0x14280 nfsidl nfsio 5521 191274 0 0 3 0x14280 nfsidl nfsio 45744 9768 0 0 3 0x14280 nfsidl nfsio 57793 149731 0 0 3 0x14280 nfsidl nfsio 18544 408802 0 0 3 0x14280 nfsidl nfsio 87965 132927 0 0 3 0x14280 nfsidl nfsio 37030 280884 0 0 3 0x14280 nfsidl nfsio 5583 406867 0 0 3 0x14280 nfsidl nfsio 46124 348030 0 0 3 0x14280 nfsidl nfsio 99320 514557 0 0 3 0x14280 nfsidl nfsio 85719 213237 0 0 3 0x14280 nfsidl nfsio 33518 329167 0 0 3 0x14280 nfsidl nfsio 61712 440544 0 0 3 0x14280 nfsidl nfsio 60591 523877 0 0 3 0x14280 nfsidl nfsio 41193 129573 0 0 3 0x14280 nfsidl nfsio 67412 108378 0 0 3 0x14280 nfsidl nfsio 8978 356202 0 0 3 0x14280 nfsidl nfsio 22850 91743 65041 0 2 0xc82 syz-executor 62621 181926 65041 0 2 0x2 syz-executor 22871 87889 65041 0 2 0xc82 syz-executor 30073 326014 65041 0 2 0xc82 syz-executor 13516 186659 65041 0 2 0xc82 syz-executor 33148 436080 65041 0 2 0xc82 syz-executor 43610 48246 65041 0 2 0xc82 syz-executor 65041 6572 7935 0 3 0x82 kqread syz-executor 7935 297265 74164 0 3 0x10008a sigsusp ksh 74164 470621 41717 0 3 0x98 kqread sshd-session 41717 44776 50462 0 3 0x92 kqread sshd-session 50462 171524 1 0 3 0x88 kqread sshd 51951 298164 97069 73 2 0x1100090 syslogd 97069 184484 1 0 3 0x100082 sbwait syslogd 72300 10088 1 0 3 0x100080 kqread resolvd 11463 72784 19895 77 3 0x100092 kqread dhcpleased 96701 473364 19895 77 3 0x100092 kqread dhcpleased 19895 266127 1 0 3 0x80 kqread dhcpleased 13242 492860 0 0 3 0x14200 bored smr 70435 17628 0 0 2 0x14200 zerothread 12302 401159 0 0 3 0x14200 aiodoned aiodoned 53851 123226 0 0 3 0x14200 syncer update 50030 185783 0 0 3 0x14200 cleaner cleaner 6650 1656 0 0 3 0x14200 reaper reaper 53669 477537 0 0 3 0x14200 pgdaemon pagedaemon 33990 501034 0 0 3 0x14200 bored viomb 48242 518692 0 0 3 0x40014200 acpi0 acpi0 77929 159508 0 0 3 0x14200 bored softnet0 36900 366612 0 0 3 0x14200 bored systqmp 79020 86000 0 0 3 0x14200 bored systq 46462 381366 0 0 2 0x40014200 softclock 53521 412465 0 0 3 0x40014200 idle0 1 271120 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 11065 12109K 12702K 166960K 14931 0 pcb 18 15K 16K 166960K 305 0 rtable 245 11K 12K 166960K 534 0 pf 29 12K 13K 166960K 108 0 ifaddr 38 7K 8K 166960K 91 0 ifgroup 49 2K 2K 166960K 152 0 sysctl 4 1K 9K 166960K 31 0 counters 32 17K 18K 166960K 146 0 ioctlops 0 0K 6K 166960K 316 0 iov 0 0K 24K 166960K 98 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1389 87K 88K 166960K 2794 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 21 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 46 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 1359 0 sigio 0 0K 0K 166960K 19 0 proc 60 59K 116K 166960K 623 0 subproc 72 4K 4K 166960K 82 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 129 0 in_multi 88 6K 7K 166960K 162 0 ether_multi 1 0K 0K 166960K 12 0 mrt 1 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 567 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 226 145K 165K 166960K 14018 0 UVM aobj 120 85K 85K 166960K 125 0 pinsyscall 37 74K 96K 166960K 2458 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 122 0 NDP 10 0K 2K 166960K 63 0 temp 77 8672K 8752K 166960K 64111 0 kqueue 14 22K 29K 166960K 271 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 120 126 0 123 1 0 1 1 0 8 0 rtentry 136 145 0 54 4 0 4 4 0 8 0 unpcb 144 1092 0 1077 14 5 9 9 0 8 8 syncache 336 6 0 6 2 1 1 1 0 8 1 tcpqe 32 3 0 3 1 0 1 1 0 8 1 tcpcb 736 428 0 422 7 0 7 7 0 8 5 arp 96 21 0 5 1 0 1 1 0 8 0 ipq 40 3 0 3 1 0 1 1 0 8 1 ipqe 40 5 0 5 1 0 1 1 0 8 1 inpcb 328 1275 0 1264 12 5 7 7 0 8 5 ip6q 72 5 0 3 1 0 1 1 0 8 0 ip6af 40 8 0 6 1 0 1 1 0 8 0 nd6 112 34 0 11 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1072 103 0 103 1 0 1 1 0 8 1 pppxif 1384 3 0 3 2 1 1 1 0 8 1 rttmr 136 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 3 0 1 3 1 2 2 0 8 0 art_heap4 256 685 0 291 31 1 30 31 0 8 3 art_table 40 688 0 292 6 0 6 6 0 8 0 art_node 32 144 0 62 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 42 0 32 1 0 1 1 0 8 0 shmpl 112 83 0 5 3 0 3 3 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 3966 0 2476 95 0 95 95 0 8 0 ffsino 256 3966 0 2476 95 0 95 95 0 8 0 nchpl 144 5923 0 4230 65 1 64 64 0 8 0 rtmask 32 6 0 6 2 1 1 1 0 8 1 vnodes 216 4888 0 0 272 0 272 272 0 8 0 namei 1024 20510 0 20507 5 1 4 4 0 8 3 vcpupl 3904 39 0 0 5 0 5 5 0 8 0 vmpool 808 39 0 0 4 0 4 4 0 8 0 kstatmem 264 90 0 70 2 0 2 2 0 8 0 scsiplug 72 7 0 7 2 1 1 1 0 8 1 scxspl 216 23216 0 23216 9 7 2 8 1 8 2 plimitpl 152 248 0 230 1 0 1 1 0 8 0 sigapl 424 1656 0 1594 8 0 8 8 0 8 0 knotepl 120 78189 0 78139 36 25 11 17 0 8 8 kqueuepl 184 607 0 597 7 3 4 4 0 8 3 pipepl 304 232 0 204 3 0 3 3 0 8 0 fdescpl 448 1621 0 1593 5 1 4 5 0 8 0 filepl 120 11000 0 10786 17 4 13 13 0 8 6 lockfpl 104 508 0 506 2 0 2 2 0 8 1 lockfspl 48 146 0 144 1 0 1 1 0 8 0 sessionpl 144 26 0 18 1 0 1 1 0 8 0 pgrppl 48 49 0 33 1 0 1 1 0 8 0 ucredpl 104 1985 0 1973 1 0 1 1 0 8 0 zombiepl 144 2160 0 2159 1 0 1 1 0 8 0 processpl 1152 1656 0 1594 5 0 5 5 0 8 0 procpl 664 3731 0 3660 7 0 7 7 0 8 0 sosppl 176 5 0 5 2 1 1 1 0 8 1 sockpl 552 2552 0 2523 25 14 11 17 0 8 7 mcl64k 65536 65 0 65 1 0 1 1 0 8 1 mcl16k 16384 5 0 5 1 0 1 1 0 8 1 mcl8k 8192 15 0 15 2 1 1 1 0 8 1 mcl4k 4096 4190 0 4139 17 9 8 16 0 8 1 mcl2k2 2112 2 0 2 1 0 1 1 0 8 1 mcl2k 2048 1906 0 1903 3 1 2 2 0 8 1 mtagpl 96 60 0 14 2 0 2 2 0 8 0 mbufpl 256 20983 0 20801 81 62 19 77 0 8 4 bufpl 280 12427 0 6206 445 0 445 445 0 8 0 anonpl 24 254490 0 246406 64 1 63 63 0 187 14 amapchunkpl 152 48710 0 47976 40 7 33 36 0 158 3 amappl16 200 4311 0 4272 39 25 14 24 0 8 8 amappl15 192 6 0 5 1 0 1 1 0 8 0 amappl14 184 5 0 5 1 1 0 1 0 8 0 amappl13 176 416 0 415 1 0 1 1 0 8 0 amappl12 168 1974 0 1936 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 47 0 37 1 0 1 1 0 8 0 amappl9 144 257 0 256 2 1 1 1 0 8 0 amappl8 136 52 0 50 1 0 1 1 0 8 0 amappl7 128 97 0 96 1 0 1 1 0 8 0 amappl6 120 286 0 275 1 0 1 1 0 8 0 amappl5 112 70 0 63 1 0 1 1 0 8 0 amappl4 104 395 0 371 1 0 1 1 0 8 0 amappl3 96 8409 0 8318 3 0 3 3 0 8 0 amappl2 88 1755 0 1681 2 0 2 2 0 8 0 amappl1 80 14433 0 13894 14 1 13 13 0 8 0 amappl 88 13091 0 12934 5 0 5 5 0 92 0 uvmvnodes 80 135 0 0 3 0 3 3 0 8 0 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 7 0 7 2 1 1 1 0 8 1 dma128 128 255 0 255 2 1 1 1 0 8 1 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 72 124 0 5 3 0 3 3 0 8 0 uaddrrnd 24 1621 0 1592 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1621 0 1592 1 0 1 1 0 8 0 vmmpekpl 168 13990 0 13944 3 0 3 3 0 8 0 vmmpepl 168 107208 0 105415 108 9 99 99 0 357 13 vmsppl 368 1620 0 1592 4 1 3 4 0 8 0 rwobjpl 40 29210 0 28107 17 1 16 16 0 8 2 pdppl 4096 3327 0 3223 147 41 106 107 0 8 2 pvpl 32 757366 0 729126 240 12 228 228 0 265 0 pmappl 216 1659 0 1592 4 0 4 4 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 510 0 122 13 1 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(ffffffff83380374) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833bb0e9,ffffffff833a0de0,4e2,ffffffff8330db96) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8006c86480) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c982b90,9260c01b000,9260c01c000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c982b90,fffffd806caefaa0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860 uvm_map_teardown(fffffd806c982b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c982b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491 exit1(ffff800033905250,0,0,3) at exit1+0x6e6 sys/kern/kern_exit.c:259 proc_suspend_check_locked(ffff800033905250,0) at proc_suspend_check_locked+0x4ba sys/kern/kern_sig.c:2235 userret(ffff800033905250) at userret+0x8c proc_suspend_check sys/kern/kern_sig.c:-1 [inline] userret(ffff800033905250) at userret+0x8c sys/kern/kern_sig.c:2194 syscall(ffff8000338ff930) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff8000338ff930) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7608620d9080, 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(ffffffff83380374) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833bb0e9,ffffffff833a0de0,4e2,ffffffff8330db96) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8006c86480) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c982b90,9260c01b000,9260c01c000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c982b90,fffffd806caefaa0,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860 uvm_map_teardown(fffffd806c982b90) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c982b90) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491 exit1(ffff800033905250,0,0,3) at exit1+0x6e6 sys/kern/kern_exit.c:259 proc_suspend_check_locked(ffff800033905250,0) at proc_suspend_check_locked+0x4ba sys/kern/kern_sig.c:2235 userret(ffff800033905250) at userret+0x8c proc_suspend_check sys/kern/kern_sig.c:-1 [inline] userret(ffff800033905250) at userret+0x8c sys/kern/kern_sig.c:2194 syscall(ffff8000338ff930) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff8000338ff930) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7608620d9080, count: -12