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(ffffffff8337caa4) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833ba125,ffffffff833a3ef8,4e2,ffffffff833102c6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80070b4800) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c9838b0,943b2f15000,943b2f16000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c9838b0,fffffd806c78bb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860 uvm_map_teardown(fffffd806c9838b0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c9838b0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491 exit1(ffff80002a7b6fa0,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7b6fa0,ffff80002f0f5050,ffff80002f0f4fa0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f0f5050) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f0f5050) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a7939ebfe30, 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(ffffffff8337caa4) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833ba125,ffffffff833a3ef8,4e2,ffffffff833102c6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80070b4800) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c9838b0,943b2f15000,943b2f16000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c9838b0,fffffd806c78bb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860 uvm_map_teardown(fffffd806c9838b0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c9838b0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491 exit1(ffff80002a7b6fa0,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7b6fa0,ffff80002f0f5050,ffff80002f0f4fa0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f0f5050) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f0f5050) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a7939ebfe30, count: -11 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002f0f4c90 rbx 0xffff8000ffff8d98 rdx 0 rcx 0 rax 0xffff80002a7b6fa0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa38c048b2a1ab747 r11 0x5cbe4443fe9738bd r12 0 r13 0xffffffff83698f60 uvm_map_addr_RBT_INFO r14 0 r15 0x1 rip 0xffffffff83070685 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002f0f4c80 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=477434 pid=23284 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a7b6fa0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a7dd248,0xffffffff838f5830 process=0xffff8000ffff8d98 user=0xffff80002f0f0000, vmspace=0xfffffd806c9838b0 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 33127 345227 0 0 3 0x14200 acct acct 41190 267 95774 0 3 0x80 fsleep syz-executor 41190 312182 95774 0 3 0x4000080 ttyopn syz-executor 53912 130079 29568 0 3 0x80 fsleep syz-executor 53912 176948 29568 0 3 0x4000080 ttyout syz-executor 16267 470982 20663 0 3 0x80 fsleep syz-executor 16267 190619 20663 0 3 0x4000080 sbwait syz-executor 34876 199924 19423 0 3 0x80 fsleep syz-executor 34876 367839 19423 0 3 0x4000080 ttyopn syz-executor 56098 325148 68789 0 3 0x1000080 fsleep syz-executor 56098 428369 68789 0 3 0x5000080 kqread syz-executor 88261 145512 87207 0 2 0xc82 syz-executor 29568 483773 87207 0 2 0xc82 syz-executor 31397 191908 87207 0 3 0x82 wait syz-executor 19423 293924 87207 0 2 0xc82 syz-executor 95774 93841 87207 0 2 0xc82 syz-executor 20663 11057 87207 0 2 0xc82 syz-executor 68789 251614 87207 0 2 0xc82 syz-executor 77859 62052 87207 0 2 0xc82 syz-executor 87207 325593 79872 0 3 0x82 kqread syz-executor 79872 162188 21327 0 3 0x10008a sigsusp ksh 21327 354361 21097 0 3 0x98 kqread sshd-session 21097 37686 7403 0 3 0x92 kqread sshd-session 75274 410073 1 0 3 0x100083 ttyin getty 7403 305792 1 0 3 0x88 kqread sshd 2569 129443 1633 73 3 0x1100090 kqread syslogd 1633 445724 1 0 3 0x100082 sbwait syslogd 63124 410241 1 0 3 0x100080 kqread resolvd 76950 103889 66607 77 3 0x100092 kqread dhcpleased 62988 225375 66607 77 3 0x100092 kqread dhcpleased 66607 382858 1 0 3 0x80 kqread dhcpleased 37373 481050 0 0 3 0x14200 bored smr 28038 74132 0 0 2 0x14200 zerothread 88192 223811 0 0 3 0x14200 aiodoned aiodoned 89879 422686 0 0 3 0x14200 syncer update 93365 346398 0 0 3 0x14200 cleaner cleaner 64067 359951 0 0 3 0x14200 reaper reaper 28088 107343 0 0 3 0x14200 pgdaemon pagedaemon 18554 408745 0 0 3 0x14200 bored viomb 40495 184086 0 0 3 0x40014200 acpi0 acpi0 4267 347266 0 0 3 0x14200 bored softnet0 42352 111085 0 0 3 0x14200 bored systqmp 88443 12497 0 0 3 0x14200 bored systq 13701 289160 0 0 3 0x40014200 tmoslp softclock 48277 52347 0 0 3 0x40014200 idle0 1 340961 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 12117K 12502K 166960K 12948 0 pcb 18 12K 12K 166960K 101 0 rtable 212 7K 8K 166960K 445 0 pf 34 13K 14K 166960K 66 0 ifaddr 40 7K 8K 166960K 72 0 ifgroup 51 2K 2K 166960K 97 0 sysctl 4 1K 9K 166960K 10 0 counters 34 17K 18K 166960K 58 0 ioctlops 0 0K 4K 166960K 169 0 iov 1 8K 32K 166960K 27 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1408 89K 89K 166960K 1830 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 82 0 dirhash 12 2K 2K 166960K 33 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 138K 166960K 542 0 sigio 0 0K 0K 166960K 7 0 proc 60 59K 91K 166960K 538 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 195 0 in_multi 89 6K 7K 166960K 143 0 ether_multi 1 0K 0K 166960K 8 0 mrt 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 396 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 233 161K 175K 166960K 6177 0 UVM aobj 13 12K 12K 166960K 16 0 pinsyscall 38 76K 84K 166960K 1630 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 26 0 NDP 11 0K 2K 166960K 43 0 temp 47 8668K 8747K 166960K 33220 0 kqueue 13 20K 30K 166960K 90 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 63 0 60 1 0 1 1 0 8 0 rtentry 136 133 0 44 4 0 4 4 0 8 0 unpcb 144 595 0 576 11 5 6 6 0 8 5 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 162 0 156 7 0 7 7 0 8 6 arp 96 20 0 4 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 414 0 403 8 1 7 7 0 8 5 ip6q 72 2 0 2 2 1 1 1 0 8 1 ip6af 40 4 0 4 2 1 1 1 0 8 1 nd6 112 28 0 7 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1072 17 0 16 1 0 1 1 0 8 0 pppxif 1384 6 0 5 2 1 1 1 0 8 0 pfstitem 24 4 0 0 1 0 1 1 0 8 0 pfstkey 128 4 0 1 1 0 1 1 0 8 0 pfstate 384 2 0 0 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 575 0 167 33 2 31 31 0 8 3 art_table 40 577 0 167 5 0 5 5 0 8 0 art_node 32 133 0 53 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 2 1 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 79 0 69 1 0 1 1 0 8 0 shmpl 112 9 0 3 1 0 1 1 0 8 0 dirhash 1024 31 0 14 3 0 3 3 0 8 0 dino2pl 256 2326 0 816 95 0 95 95 0 8 0 ffsino 256 2326 0 816 95 0 95 95 0 8 0 nchpl 144 3014 0 1310 64 0 64 64 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 vnodes 216 2722 0 0 152 0 152 152 0 8 0 namei 1024 9796 0 9796 2 1 1 1 0 8 1 vcpupl 3904 4 0 0 1 0 1 1 0 8 0 vmpool 808 4 0 0 1 0 1 1 0 8 0 kstatmem 264 50 0 28 3 0 3 3 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 13720 0 13720 9 1 8 8 1 8 8 plimitpl 152 161 0 143 1 0 1 1 0 8 0 sigapl 424 815 0 771 6 1 5 6 0 8 0 knotepl 120 18678 0 18631 15 4 11 15 0 8 8 kqueuepl 184 135 0 125 1 0 1 1 0 8 0 pipepl 304 176 0 149 5 0 5 5 0 8 2 fdescpl 448 801 0 772 4 0 4 4 0 8 0 filepl 120 4286 0 4064 15 3 12 12 0 8 4 lockfpl 104 193 0 191 1 0 1 1 0 8 0 lockfspl 48 55 0 53 1 0 1 1 0 8 0 sessionpl 144 23 0 15 1 0 1 1 0 8 0 pgrppl 48 103 0 87 1 0 1 1 0 8 0 ucredpl 104 487 0 476 1 0 1 1 0 8 0 zombiepl 144 774 0 771 2 1 1 1 0 8 0 processpl 1152 815 0 771 4 0 4 4 0 8 0 procpl 664 1408 0 1359 6 1 5 6 0 8 0 sosppl 176 7 0 7 2 1 1 1 0 8 1 sockpl 552 1092 0 1059 21 10 11 12 0 8 8 mcl64k 65536 116 0 116 2 1 1 1 0 8 1 mcl8k 8192 5 0 5 2 1 1 1 0 8 1 mcl4k 4096 2959 0 2904 14 6 8 14 0 8 0 mcl2k 2048 721 0 720 5 1 4 4 0 8 3 mtagpl 96 21 0 4 1 0 1 1 0 8 0 mbufpl 256 8570 0 8376 20 1 19 19 0 8 4 bufpl 280 8755 0 2534 445 0 445 445 0 8 0 anonpl 24 154944 0 147129 52 4 48 50 0 187 0 amapchunkpl 152 20249 0 19494 44 14 30 35 0 158 0 amappl16 200 3225 0 3194 23 11 12 16 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 7 0 7 1 1 0 1 0 8 0 amappl13 176 418 0 417 1 0 1 1 0 8 0 amappl12 168 1146 0 1107 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 73 0 63 1 0 1 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 38 0 37 1 0 1 1 0 8 0 amappl7 128 86 0 85 1 0 1 1 0 8 0 amappl6 120 273 0 262 1 0 1 1 0 8 0 amappl5 112 76 0 67 1 0 1 1 0 8 0 amappl4 104 391 0 367 1 0 1 1 0 8 0 amappl3 96 3417 0 3322 3 0 3 3 0 8 0 amappl2 88 918 0 846 2 0 2 2 0 8 0 amappl1 80 10708 0 10165 13 0 13 13 0 8 0 amappl 88 5412 0 5249 5 1 4 5 0 92 0 uvmvnodes 80 104 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 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 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 15 0 3 1 0 1 1 0 8 0 uaddrrnd 24 801 0 771 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 801 0 771 1 0 1 1 0 8 0 vmmpekpl 168 7870 0 7830 3 0 3 3 0 8 0 vmmpepl 168 57953 0 56119 91 0 91 91 0 357 9 vmsppl 368 800 0 771 3 0 3 3 0 8 0 rwobjpl 40 18549 0 17586 13 0 13 13 0 8 0 pdppl 4096 1617 0 1546 99 27 72 72 0 8 1 pvpl 32 385968 0 358143 230 5 225 225 0 265 0 pmappl 216 804 0 771 2 0 2 2 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 393 0 43 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(ffffffff8337caa4) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833ba125,ffffffff833a3ef8,4e2,ffffffff833102c6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80070b4800) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c9838b0,943b2f15000,943b2f16000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c9838b0,fffffd806c78bb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860 uvm_map_teardown(fffffd806c9838b0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c9838b0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491 exit1(ffff80002a7b6fa0,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7b6fa0,ffff80002f0f5050,ffff80002f0f4fa0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f0f5050) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f0f5050) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a7939ebfe30, 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(ffffffff8337caa4) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff833ba125,ffffffff833a3ef8,4e2,ffffffff833102c6) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80070b4800) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c9838b0,943b2f15000,943b2f16000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c9838b0,fffffd806c78bb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1860 uvm_map_teardown(fffffd806c9838b0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c9838b0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2491 exit1(ffff80002a7b6fa0,0,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259 sys_exit(ffff80002a7b6fa0,ffff80002f0f5050,ffff80002f0f4fa0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f0f5050) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f0f5050) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a7939ebfe30, count: -11