panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1250 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 94465 36249 32767 0x10 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83447ce1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ab42,ffffffff833e26e6,4e2,ffffffff833e271b) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8008cb99b8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c85c218,61fb0317000,61fb0318000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c85c218,fffffd806c874400,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806c85c218) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c85c218) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffe4028,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe4028,ffff800036bb40d0,ffff800036bb4020) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800036bb40d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800036bb40d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77a8a50ebd10, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1250 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83447ce1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ab42,ffffffff833e26e6,4e2,ffffffff833e271b) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8008cb99b8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c85c218,61fb0317000,61fb0318000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c85c218,fffffd806c874400,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806c85c218) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c85c218) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffe4028,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe4028,ffff800036bb40d0,ffff800036bb4020) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800036bb40d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800036bb40d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77a8a50ebd10, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800036bb3cf0 rbx 0xffffffff83913e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000fffe4028 rax 0xffffffff83912ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xb896948fd1a124f8 r11 0xd1a16768d7f23bd4 r12 0xffffffff83913c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff8307c625 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800036bb3ce0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=400960 pid=29354 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=66, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffe4028 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffe6550,0xffff8000fffe5a28 process=0xffff8000fffe09c0 user=0xffff800036baf000, vmspace=0xfffffd806c85c218 estcpu=16, cpticks=5, pctcpu=0.1, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 43967 437039 64719 32767 2 0x10 syz-executor 85570 316008 29704 32767 2 0x10 syz-executor 85570 286792 29704 32767 2 0x4000010 syz-executor 43093 372285 72329 32767 2 0x10 syz-executor 43093 388578 72329 32767 3 0x4000090 ttyout syz-executor 43093 9738 72329 32767 2 0x4000010 syz-executor 45079 489873 30343 32767 2 0x10 syz-executor 45079 203255 30343 32767 3 0x4000090 kqpoll syz-executor 81191 497465 36249 32767 2 0x10 syz-executor 81191 151958 36249 32767 3 0x4000090 fsleep syz-executor 81191 57510 36249 32767 3 0x4000090 fsleep syz-executor 81191 303184 36249 32767 3 0x4000090 fsleep syz-executor 29704 248842 87979 32767 2 0xc90 syz-executor 4392 287195 34129 32767 3 0x90 wait syz-executor 30343 430758 79572 32767 2 0xc90 syz-executor 23439 15944 28125 32767 2 0x10 syz-executor 36249 94465 2679 32767 7 0x10 syz-executor 68576 422459 25486 32767 2 0xc90 syz-executor 64719 81915 10122 32767 2 0xc90 syz-executor 72329 280825 39393 32767 2 0xc90 syz-executor 87979 425973 83239 0 3 0x82 wait syz-executor 34129 498489 83239 0 3 0x82 wait syz-executor 25486 103367 83239 0 3 0x82 wait syz-executor 2679 76942 83239 0 3 0x82 wait syz-executor 28125 93725 83239 0 3 0x82 wait syz-executor 10122 222898 83239 0 3 0x82 wait syz-executor 39393 150923 83239 0 3 0x82 wait syz-executor 79572 238400 83239 0 3 0x82 wait syz-executor 83239 227022 98064 0 3 0x82 kqread syz-executor 98064 511390 57365 0 3 0x10008a sigsusp ksh 57365 459159 19134 0 3 0x98 kqread sshd-session 19134 349095 87728 0 3 0x92 kqread sshd-session 13517 194916 1 0 3 0x100083 ttyin getty 87728 281986 1 0 3 0x88 kqread sshd 82032 441206 38093 73 3 0x1100090 kqread syslogd 38093 401983 1 0 3 0x100082 sbwait syslogd 42586 129398 1 0 3 0x100080 kqread resolvd 83014 331743 61726 77 3 0x100092 kqread dhcpleased 1394 394496 61726 77 3 0x100092 kqread dhcpleased 61726 352308 1 0 3 0x80 kqread dhcpleased 81196 460348 0 0 3 0x14200 bored smr 5457 373914 0 0 3 0x14200 pgzero zerothread 57379 141424 0 0 3 0x14200 aiodoned aiodoned 58297 119940 0 0 3 0x14200 syncer update 60787 153467 0 0 3 0x14200 cleaner cleaner 64892 144786 0 0 3 0x14200 reaper reaper 83581 4389 0 0 3 0x14200 pgdaemon pagedaemon 57165 440440 0 0 3 0x14200 bored viomb 29834 244603 0 0 3 0x40014200 acpi0 acpi0 3369 275488 0 0 3 0x40014200 idle1 47443 377997 0 0 3 0x14200 bored softnet1 22130 346086 0 0 3 0x14200 bored softnet0 21855 361860 0 0 3 0x14200 bored systqmp 63784 107205 0 0 3 0x14200 bored systq 4466 399540 0 0 2 0x14200 softclockmp 19517 422458 0 0 3 0x40014200 tmoslp softclock 8603 83335 0 0 3 0x40014200 idle0 1 178451 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11084 12023K 12034K 166960K 12177 0 pcb 17 12K 12K 166960K 17 0 rtable 239 6K 7K 166960K 352 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 36 0 iov 0 0K 16K 166960K 7 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1425 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 9 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 129K 166960K 260 0 sigio 0 0K 0K 166960K 4 0 proc 61 115K 163K 166960K 511 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 157 0 in_multi 99 7K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 364 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 248 169K 199K 166960K 4069 0 UVM aobj 10 5K 6K 166960K 11 0 pinsyscall 45 90K 116K 166960K 1331 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 11 0K 2K 166960K 27 0 temp 35 9074K 9138K 166960K 4327 0 kqueue 13 20K 28K 166960K 55 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 40 0 37 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 283 0 268 6 0 6 6 0 8 5 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 118 0 113 7 0 7 7 0 8 5 arp 136 18 0 0 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 3 0 2 1 0 1 1 0 8 0 inpcb 328 348 0 335 7 0 7 7 0 8 5 nd6 152 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 466 0 0 30 0 30 30 0 8 0 art_table 40 467 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 112 8 0 1 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1788 0 327 92 0 92 92 0 8 0 ffsino 296 1788 0 327 113 0 113 113 0 8 0 nchpl 144 2155 0 467 63 0 63 63 0 8 0 vnodes 216 1869 0 0 104 0 104 104 0 8 0 namei 1024 6931 0 6931 2 0 2 2 0 8 2 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 7288 0 7288 9 1 8 8 1 8 8 plimitpl 152 156 0 129 2 0 2 2 0 8 0 sigapl 424 548 0 495 7 0 7 7 0 8 0 knotepl 120 491 0 0 15 0 15 15 0 8 0 kqueuepl 224 59 0 49 1 0 1 1 0 8 0 pipepl 344 128 0 101 3 0 3 3 0 8 0 fdescpl 528 532 0 496 4 0 4 4 0 8 0 filepl 160 2652 0 2437 20 2 18 20 0 8 8 lockfpl 104 54 0 52 1 0 1 1 0 8 0 lockfspl 48 21 0 19 1 0 1 1 0 8 0 sessionpl 144 34 0 18 1 0 1 1 0 8 0 pgrppl 48 42 0 18 1 0 1 1 0 8 0 ucredpl 104 576 0 557 1 0 1 1 0 8 0 zombiepl 144 497 0 495 1 0 1 1 0 8 0 processpl 1232 548 0 495 5 0 5 5 0 8 0 procpl 664 775 0 715 7 0 7 7 0 8 1 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 672 0 641 21 9 12 21 0 8 8 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 270 0 0 17 0 17 17 0 8 0 bufpl 280 4700 0 102 329 0 329 329 0 8 0 anonpl 32 8722 0 0 71 0 71 71 0 246 0 amapchunkpl 152 13064 0 12239 42 0 42 42 0 158 7 amappl16 200 2334 0 2308 14 0 14 14 0 8 9 amappl15 192 123 0 123 1 1 0 1 0 8 0 amappl14 184 401 0 400 1 0 1 1 0 8 0 amappl13 176 110 0 100 1 0 1 1 0 8 0 amappl12 168 762 0 727 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 65 0 55 1 0 1 1 0 8 0 amappl9 144 263 0 263 1 1 0 1 0 8 0 amappl8 136 92 0 91 1 0 1 1 0 8 0 amappl7 128 164 0 152 1 0 1 1 0 8 0 amappl6 120 183 0 182 1 0 1 1 0 8 0 amappl5 112 110 0 103 1 0 1 1 0 8 0 amappl4 104 258 0 242 1 0 1 1 0 8 0 amappl3 96 2223 0 2088 5 1 4 4 0 8 0 amappl2 88 530 0 469 2 0 2 2 0 8 0 amappl1 80 10319 0 9735 17 1 16 16 0 8 1 amappl 88 3370 0 3186 5 0 5 5 0 92 0 uvmvnodes 80 100 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 128 253 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 10 0 1 1 0 1 1 0 8 0 uaddrrnd 24 532 0 495 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 532 0 495 1 0 1 1 0 8 0 vmmpekpl 168 6281 0 6251 2 0 2 2 0 8 0 vmmpepl 168 43519 0 41446 106 0 106 106 0 357 8 vmsppl 488 531 0 495 7 1 6 6 0 8 0 rwobjpl 80 15847 0 14868 25 0 25 25 0 8 0 pdppl 4096 1071 0 990 113 30 83 99 0 8 2 pvpl 32 28781 0 0 234 1 233 233 0 265 0 pmappl 256 531 0 495 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 295 0 33 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83447ce1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348ab42,ffffffff833e26e6,4e2,ffffffff833e271b) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8008cb99b8) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806c85c218,61fb0317000,61fb0318000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806c85c218,fffffd806c874400,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806c85c218) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806c85c218) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffe4028,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffe4028,ffff800036bb40d0,ffff800036bb4020) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800036bb40d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800036bb40d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x77a8a50ebd10, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299bdff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83ac0400) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ac0400) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 syscall(ffff8000353a8d00) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000353a8d00) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fb6ad8678f0, count: 9 ddb{1}> trace x86_ipi_db(ffff8000299bdff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83ac0400) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83ac0400) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 syscall(ffff8000353a8d00) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff8000353a8d00) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fb6ad8678f0, count: -6