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 223768 86321 32767 0x10 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344a63f) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348d41f,ffffffff833e2c8b,4e2,ffffffff833e2cc0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80092d2aa0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cab9218,9a75631f000,9a75671e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cab9218,fffffd8069d03118,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cab9218) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cab9218) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffeefa8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffeefa8,ffff80003c41b050,ffff80003c41afa0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c41b050) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41b050) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78f991481a90, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1250 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344a63f) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348d41f,ffffffff833e2c8b,4e2,ffffffff833e2cc0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80092d2aa0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cab9218,9a75631f000,9a75671e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cab9218,fffffd8069d03118,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cab9218) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cab9218) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffeefa8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffeefa8,ffff80003c41b050,ffff80003c41afa0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c41b050) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41b050) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78f991481a90, count: -11 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c41ac70 rbx 0xffff8000299aee07 rdx 0 rcx 0xffff8000fffeefa8 rax 0xffff8000299adff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xf0daf0f1052c759f r11 0x5306ed131fa5acf r12 0xffff8000299aec08 r13 0 r14 0 r15 0x1 rip 0xffffffff81f9e005 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c41ac60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=329186 pid=94927 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=59, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffeefa8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffeed10,0xffff800036fb0fc8 process=0xffff800038fde1d0 user=0xffff80003c416000, vmspace=0xfffffd806cab9218 estcpu=9, cpticks=9, pctcpu=0.6, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 83828 6278 86321 32767 3 0x3010 suspend syz-executor 83828 486704 86321 32767 2 0x4081090 syz-executor 83828 4396 86321 32767 2 0x4081090 syz-executor 37153 27957 82150 32767 2 0xc90 syz-executor 37153 93338 82150 32767 3 0x4000090 fsleep syz-executor 39972 502379 95040 32767 2 0x10 syz-executor 39972 446923 95040 32767 3 0x4000090 kqsel syz-executor 97407 319065 76177 32767 2 0x10 syz-executor 97407 482600 76177 32767 3 0x4000090 msgwait syz-executor 11256 454789 19241 32767 2 0x10 syz-executor 11256 21676 19241 32767 3 0x4000090 fsleep syz-executor 11256 360809 19241 32767 3 0x4000090 pipewr syz-executor 11256 347856 19241 32767 3 0x4000090 fsleep syz-executor 19241 102512 68003 32767 2 0xc90 syz-executor 82150 8519 94725 32767 2 0xc90 syz-executor 58841 106155 54745 32767 2 0xc90 syz-executor 20236 295492 44559 32767 2 0xc90 syz-executor 86321 223768 23995 32767 7 0x10 syz-executor 76177 236529 25082 32767 2 0xc90 syz-executor 95040 248845 96204 32767 2 0xc90 syz-executor 92222 224970 12544 32767 3 0x90 nanoslp syz-executor 54745 185706 69302 0 3 0x82 wait syz-executor 68003 6529 69302 0 3 0x82 wait syz-executor 44559 268807 69302 0 3 0x82 wait syz-executor 25082 158168 69302 0 3 0x82 wait syz-executor 23995 176946 69302 0 3 0x82 wait syz-executor 94725 226947 69302 0 3 0x82 wait syz-executor 96204 413708 69302 0 3 0x82 wait syz-executor 12544 493562 69302 0 3 0x82 wait syz-executor 69302 28435 94073 0 3 0x82 kqread syz-executor 94073 158934 84575 0 3 0x10008a sigsusp ksh 84575 120064 5936 0 3 0x98 kqread sshd-session 5936 497675 5204 0 3 0x92 kqread sshd-session 66828 11849 1 0 3 0x100083 ttyin getty 5204 40233 1 0 3 0x88 kqread sshd 96057 18017 18296 73 3 0x1100090 kqread syslogd 18296 24737 1 0 3 0x100082 sbwait syslogd 5580 273873 1 0 3 0x100080 kqread resolvd 20903 229552 66825 77 3 0x100092 kqread dhcpleased 10642 469142 66825 77 3 0x100092 kqread dhcpleased 66825 350983 1 0 3 0x80 kqread dhcpleased 69154 105046 0 0 3 0x14200 bored smr 78306 265820 0 0 3 0x14200 pgzero zerothread 44520 17391 0 0 3 0x14200 aiodoned aiodoned 8071 117248 0 0 3 0x14200 syncer update 27829 310085 0 0 3 0x14200 cleaner cleaner 18070 33453 0 0 3 0x14200 reaper reaper 39200 226425 0 0 3 0x14200 pgdaemon pagedaemon 2336 329347 0 0 3 0x14200 bored viomb 59906 342897 0 0 3 0x40014200 acpi0 acpi0 43683 229290 0 0 3 0x40014200 idle1 99707 235959 0 0 3 0x14200 bored softnet1 15800 319954 0 0 3 0x14200 bored softnet0 74475 222789 0 0 3 0x14200 bored systqmp 51265 266098 0 0 3 0x14200 bored systq 64238 100640 0 0 3 0x14200 tmoslp softclockmp 38895 272128 0 0 3 0x40014200 tmoslp softclock 54511 199175 0 0 3 0x40014200 idle0 1 284057 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11053 12018K 12034K 166960K 12144 0 pcb 17 12K 12K 166960K 17 0 rtable 241 6K 7K 166960K 364 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 2 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 31 0 iov 1 0K 0K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1358 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 125K 166960K 212 0 proc 58 99K 179K 166960K 500 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 10 0 in_multi 99 7K 7K 166960K 99 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 371 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 277 178K 214K 166960K 3751 0 UVM aobj 7 2K 2K 166960K 9 0 pinsyscall 46 92K 113K 166960K 1333 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 10 0 NDP 11 0K 2K 166960K 27 0 temp 39 9071K 9135K 166960K 4253 0 kqueue 13 20K 28K 166960K 43 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 44 0 41 1 0 1 1 0 8 0 rtentry 176 113 0 1 6 0 6 6 0 8 0 unpcb 144 232 0 215 4 0 4 4 0 8 3 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 736 148 0 140 4 0 4 4 0 8 3 arp 136 19 0 0 1 0 1 1 0 8 0 inpcb 328 239 0 226 5 0 5 5 0 8 3 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 256 456 0 0 29 0 29 29 0 8 0 art_table 40 457 0 0 5 0 5 5 0 8 0 art_node 32 113 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 4 0 1 1 0 1 1 0 8 0 shmpl 112 6 0 2 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1660 0 198 92 0 92 92 0 8 0 ffsino 296 1660 0 198 114 0 114 114 0 8 1 nchpl 144 1937 0 249 63 0 63 63 0 8 0 vnodes 216 1741 0 0 97 0 97 97 0 8 0 namei 1024 5776 0 5776 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 6758 0 6758 4 3 1 3 1 8 1 plimitpl 152 48 0 20 2 0 2 2 0 8 0 sigapl 424 514 0 460 7 0 7 7 0 8 0 knotepl 120 305 0 0 10 0 10 10 0 8 0 kqueuepl 224 82 0 72 3 0 3 3 0 8 2 pipepl 344 128 0 100 3 0 3 3 0 8 0 fdescpl 528 498 0 461 4 0 4 4 0 8 0 filepl 160 2053 0 1835 15 0 15 15 0 8 4 lockfpl 104 38 0 36 1 0 1 1 0 8 0 lockfspl 48 17 0 15 1 0 1 1 0 8 0 sessionpl 144 27 0 11 1 0 1 1 0 8 0 pgrppl 48 35 0 11 1 0 1 1 0 8 0 ucredpl 104 186 0 167 1 0 1 1 0 8 0 zombiepl 144 463 0 460 1 0 1 1 0 8 0 processpl 1232 514 0 460 5 0 5 5 0 8 0 procpl 664 644 0 582 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 516 0 483 14 1 13 14 0 8 8 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 15 0 0 2 0 2 2 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 196 0 0 13 0 13 13 0 8 0 bufpl 280 4953 0 102 347 0 347 347 0 8 0 anonpl 32 8266 0 0 67 0 67 67 0 246 0 amapchunkpl 152 10846 0 9948 35 0 35 35 0 158 0 amappl16 200 1989 0 1965 5 1 4 5 0 8 1 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 410 0 409 1 0 1 1 0 8 0 amappl13 176 123 0 113 1 0 1 1 0 8 0 amappl12 168 738 0 700 2 0 2 2 0 8 0 amappl11 160 10 0 10 2 2 0 1 0 8 0 amappl10 152 119 0 109 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 1 0 1 0 8 0 amappl8 136 96 0 94 1 0 1 1 0 8 0 amappl7 128 143 0 131 1 0 1 1 0 8 0 amappl6 120 156 0 155 1 0 1 1 0 8 0 amappl5 112 130 0 122 1 0 1 1 0 8 0 amappl4 104 293 0 276 1 0 1 1 0 8 0 amappl3 96 1914 0 1762 5 1 4 4 0 8 0 amappl2 88 550 0 497 2 0 2 2 0 8 0 amappl1 80 10930 0 10348 19 0 19 19 0 8 4 amappl 88 3017 0 2807 5 0 5 5 0 92 0 uvmvnodes 80 99 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 8 0 2 1 0 1 1 0 8 0 uaddrrnd 24 498 0 460 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 498 0 460 1 0 1 1 0 8 0 vmmpekpl 168 6204 0 6168 2 0 2 2 0 8 0 vmmpepl 168 42434 0 40301 116 0 116 116 0 357 15 vmsppl 488 497 0 460 7 1 6 6 0 8 0 rwobjpl 80 15618 0 14628 28 0 28 28 0 8 4 pdppl 4096 1003 0 920 111 24 87 97 0 8 4 pvpl 32 30364 0 0 245 0 245 245 0 265 0 pmappl 256 497 0 460 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 282 0 27 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83965ff0) 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(ffffffff839d7900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839d7900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff800036ba7840) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800036ba7840) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a10e9259520, count: 9 ddb{0}> trace x86_ipi_db(ffffffff83965ff0) 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(ffffffff839d7900) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839d7900) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff800036ba7840) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800036ba7840) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7a10e9259520, count: -6 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344a63f) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348d41f,ffffffff833e2c8b,4e2,ffffffff833e2cc0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80092d2aa0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cab9218,9a75631f000,9a75671e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cab9218,fffffd8069d03118,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cab9218) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cab9218) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffeefa8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffeefa8,ffff80003c41b050,ffff80003c41afa0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c41b050) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41b050) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78f991481a90, count: 4 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8344a63f) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348d41f,ffffffff833e2c8b,4e2,ffffffff833e2cc0) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd80092d2aa0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806cab9218,9a75631f000,9a75671e000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806cab9218,fffffd8069d03118,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806cab9218) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806cab9218) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff8000fffeefa8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffeefa8,ffff80003c41b050,ffff80003c41afa0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c41b050) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41b050) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78f991481a90, count: -11