panic: kernel diagnostic assertion "pg->wire_count != 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1207 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 382242 84159 32767 0x10 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c5ad5) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83504a43,ffffffff834581f8,4b7,ffffffff8345822d) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffb0004bc2bc0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffffb000f93b7d0,f9fba6a5000,f9fba6a6000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffb000f93b7d0,fffffb0060fa9590,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffb000f93b7d0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffb000f93b7d0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c3cba18,0,0,1) at exit1+0x71b sys/kern/kern_exit.c:260 sys_exit(ffff80003c3cba18,ffff80003c3b60f0,ffff80003c3b6040) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3b60f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3b60f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c6ad6326e70, 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 1207 ddb{0}> show kasan No such command ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834c5ad5) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83504a43,ffffffff834581f8,4b7,ffffffff8345822d) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffb0004bc2bc0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffffb000f93b7d0,f9fba6a5000,f9fba6a6000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffb000f93b7d0,fffffb0060fa9590,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffb000f93b7d0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffb000f93b7d0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c3cba18,0,0,1) at exit1+0x71b sys/kern/kern_exit.c:260 sys_exit(ffff80003c3cba18,ffff80003c3b60f0,ffff80003c3b6040) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3b60f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3b60f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c6ad6326e70, count: -11 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c3b5d10 rbx 0xffffffff839a0e0f cpu_info_full_primary+0x2e0f rdx 0 rcx 0xffff80003c3cba18 rax 0xffffffff8399fff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xcd0f1c1ab8a35459 r11 0xb1c3eaefb4c543e7 r12 0xffffffff839a0c10 cpu_info_full_primary+0x2c10 r13 0 r14 0 r15 0x1 rip 0xffffffff8248e285 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c3b5d00 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=309875 pid=44548 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=74, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c3cba18 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a22ba08,0xffff80002a22bcb0 process=0xffff800045fed378 user=0xffff80003c3b1000, vmspace=0xfffffb000f93b7d0 estcpu=24, cpticks=5, pctcpu=0.2, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 9978 213622 40436 0 2 0x2 0 ifconfig 40436 22953 92278 0 3 0x100002 0x88 sigsusp sh 92278 300628 81515 0 2 0x10000000 0 syz-executor 32474 385058 84159 32767 2 0x10 0 syz-executor 32474 505417 84159 32767 3 0x10 0x4000080 sbwait syz-executor 81515 324668 5855 0 3 0x2 0x80 wait syz-executor 87679 240798 70236 32767 2 0x10 0 syz-executor 70236 220653 5855 0 3 0x2 0x80 wait syz-executor 72480 55617 5855 0 3 0x2 0x80 wait syz-executor 3226 309293 10531 32767 2 0x10 0xc80 syz-executor 10531 326036 5855 0 3 0x2 0x80 wait syz-executor 9588 360022 77193 32767 2 0x10 0xc80 syz-executor 77193 98755 5855 0 3 0x2 0x80 wait syz-executor 84159 382242 61330 32767 7 0x10 0 syz-executor 80593 389573 79256 32767 2 0x10 0xc80 syz-executor 59233 129563 24077 32767 2 0x10 0xc80 syz-executor 61330 386758 5855 0 3 0x2 0x80 wait syz-executor 79256 201354 5855 0 3 0x2 0x80 wait syz-executor 24077 421792 5855 0 3 0x2 0x80 wait syz-executor 5855 126003 68751 0 3 0x2 0x80 kqread syz-executor 68751 431087 60848 0 3 0x100002 0x88 sigsusp ksh 60848 229495 36963 0 3 0x10 0x88 kqread sshd-session 36963 103031 11070 0 3 0x12 0x80 kqread sshd-session 72148 366379 1 0 3 0x100003 0x80 ttyin getty 11070 396862 1 0 3 0 0x88 kqread sshd 55232 391209 65378 73 2 0x1100010 0x80 syslogd 65378 50392 1 0 3 0x100002 0x80 sbwait syslogd 39261 277546 1 0 3 0x100000 0x80 kqread resolvd 38273 356251 68731 77 3 0x100012 0x80 kqread dhcpleased 16191 278081 68731 77 3 0x100012 0x80 kqread dhcpleased 68731 356886 1 0 3 0 0x80 kqread dhcpleased 14551 400523 0 0 3 0x14000 0x200 bored smr 33712 229808 0 0 2 0x14000 0x200 zerothread 31492 480736 0 0 3 0x14000 0x200 aiodoned aiodoned 34727 110693 0 0 3 0x14000 0x200 syncer update 86665 245931 0 0 3 0x14000 0x200 cleaner cleaner 93326 117589 0 0 3 0x14000 0x200 reaper reaper 52389 486055 0 0 3 0x14000 0x200 pgdaemon pagedaemon 54558 200197 0 0 3 0x14000 0x200 bored viomb 75432 512142 0 0 3 0x14000 0x40000200 acpi0 acpi0 14568 141998 0 0 3 0x14000 0x40000200 idle1 88998 150030 0 0 3 0x14000 0x200 bored softnet1 64507 395071 0 0 3 0x14000 0x200 bored softnet0 51658 321560 0 0 3 0x14000 0x200 smrbar systqmp 50999 30559 0 0 3 0x14000 0x200 bored systq 93294 86659 0 0 3 0x14000 0x200 tmoslp softclockmp 98282 35435 0 0 2 0x14000 0x40000200 softclock 14328 50360 0 0 3 0x14000 0x40000200 idle0 1 473386 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 87679 (syz-executor) thread 0xffff800045fe8fb0 (240798) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a639c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 dofstatat+0xe1 sys/kern/vfs_syscalls.c:2025 #2 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #2 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791 #3 Xsyscall+0x128 Process 51658 (systqmp) thread 0xffff800045ffe000 (321560) shared rwlock systqmp r = 0 (0xffffffff8394f698) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11052 12016K 12034K 166960K 12161 0 pcb 17 12K 12K 166960K 17 0 rtable 217 6K 7K 166960K 503 0 pf 29 16K 16K 166960K 41 0 ifaddr 38 6K 7K 166960K 66 0 ifgroup 46 2K 2K 166960K 70 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 37K 166960K 80 0 ioctlops 0 0K 4K 166960K 47 0 iov 0 0K 8K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1423 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 13K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 15 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 24 89K 125K 166960K 300 0 sigio 0 0K 0K 166960K 4 0 proc 58 99K 163K 166960K 647 0 subproc 72 4K 4K 166960K 126 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 29 0 in_multi 88 5K 6K 166960K 157 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 463 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 251 179K 200K 166960K 4041 0 UVM aobj 7 2K 2K 166960K 7 0 pinsyscall 45 90K 114K 166960K 1507 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 14 0K 2K 166960K 42 0 temp 35 9114K 9134K 166960K 4124 0 kqueue 13 20K 24K 166960K 34 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 53 0 50 1 0 1 1 0 8 0 rtentry 176 167 0 67 6 0 6 6 0 8 0 unpcb 144 83 0 64 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 36 0 32 1 0 1 1 0 8 0 arp 136 28 0 12 1 0 1 1 0 8 0 inpcb 328 169 0 162 2 0 2 2 0 8 1 nd6 152 40 0 18 1 0 1 1 0 8 0 kcovpl 48 14 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 678 0 220 29 0 29 29 0 8 0 art_table 40 679 0 220 5 0 5 5 0 8 0 art_node 32 167 0 67 1 0 1 1 0 8 0 semapl 72 2 0 0 1 0 1 1 0 8 0 shmpl 120 4 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 0 3 0 3 3 0 8 0 dino2pl 256 1676 0 200 93 0 93 93 0 8 0 ffsino 296 1676 0 200 114 0 114 114 0 8 0 nchpl 144 1953 0 247 64 0 64 64 0 8 0 vnodes 216 1811 0 0 101 0 101 101 0 8 0 namei 1024 7261 0 7261 4 1 3 3 0 8 3 percpumem 16 56 0 6 1 0 1 1 0 8 0 kstatmem 264 35 0 12 2 0 2 2 0 8 0 scxspl 216 6618 0 6618 4 3 1 3 1 8 1 plimitpl 152 58 0 32 2 0 2 2 0 8 0 sigapl 424 578 0 525 7 0 7 7 0 8 0 knotepl 120 300 0 0 10 0 10 10 0 8 0 kqueuepl 224 39 0 30 1 0 1 1 0 8 0 pipepl 344 141 0 114 3 0 3 3 0 8 0 fdescpl 528 562 0 526 4 0 4 4 0 8 1 filepl 160 2054 0 1833 10 0 10 10 0 8 0 lockfpl 104 27 0 25 1 0 1 1 0 8 0 lockfspl 48 10 0 8 1 0 1 1 0 8 0 sessionpl 144 41 0 25 1 0 1 1 0 8 0 pgrppl 48 60 0 36 1 0 1 1 0 8 0 ucredpl 104 311 0 293 1 0 1 1 0 8 0 zombiepl 144 530 0 525 1 0 1 1 0 8 0 processpl 1240 578 0 525 5 0 5 5 0 8 0 procpl 664 714 0 660 6 0 6 6 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 305 0 276 4 0 4 4 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mextrefs 64 19 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 221 0 0 14 0 14 14 0 8 0 bufpl 272 4605 0 102 301 0 301 301 0 8 0 anonpl 32 8159 0 0 66 0 66 66 0 247 0 amapchunkpl 152 11756 0 10948 32 0 32 32 0 158 0 amappl16 200 1719 0 1701 5 1 4 5 0 8 1 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 465 0 463 1 0 1 1 0 8 0 amappl13 176 128 0 117 1 0 1 1 0 8 0 amappl12 168 809 0 775 2 0 2 2 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 62 0 52 1 0 1 1 0 8 0 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 111 0 110 1 0 1 1 0 8 0 amappl7 128 145 0 134 1 0 1 1 0 8 0 amappl6 120 200 0 197 1 0 1 1 0 8 0 amappl5 112 94 0 87 1 0 1 1 0 8 0 amappl4 104 275 0 260 1 0 1 1 0 8 0 amappl3 96 2008 0 1903 4 1 3 3 0 8 0 amappl2 88 650 0 573 2 0 2 2 0 8 0 amappl1 80 11102 0 10537 15 0 15 15 0 8 2 amappl 88 3279 0 3095 5 0 5 5 0 92 0 uvmvnodes 80 97 0 0 2 0 2 2 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 562 0 525 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 562 0 525 1 0 1 1 0 8 0 vmmpekpl 168 6252 0 6208 3 0 3 3 0 8 0 vmmpepl 168 44500 0 42515 94 0 94 94 0 357 4 vmsppl 488 561 0 525 7 1 6 6 0 8 1 rwobjpl 80 15822 0 14872 23 0 23 23 0 8 1 pdppl 4096 1131 0 1050 115 28 87 97 0 8 6 pvpl 32 28775 0 0 234 1 233 233 0 265 0 pmappl 256 561 0 525 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 591 0 32 17 0 17 17 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(ffffffff834c5ad5) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83504a43,ffffffff834581f8,4b7,ffffffff8345822d) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffb0004bc2bc0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1206 uvm_fault_unwire_locked(fffffb000f93b7d0,f9fba6a5000,f9fba6a6000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffb000f93b7d0,fffffb0060fa9590,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffb000f93b7d0) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffb000f93b7d0) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c3cba18,0,0,1) at exit1+0x71b sys/kern/kern_exit.c:260 sys_exit(ffff80003c3cba18,ffff80003c3b60f0,ffff80003c3b6040) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c3b60f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3b60f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c6ad6326e70, count: -11 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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(ffffffff83a631c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a631c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003a3b0880) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003a3b0880) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cd3af4f9c50, count: 9 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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(ffffffff83a631c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a631c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80003a3b0880) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003a3b0880) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cd3af4f9c50, count: -6