panic: kernel diagnostic assertion "pg->wire_cWAoRuNnIt N=G:= 0S" PfLa iNlOeTd LO:WE fRiElDe O"N/ sSyYzSCkAalLLl e9r/1m a2n0a gEXeIrTs /s0etu icd /kStopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 66403 38644 32767 0x10000010 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7b91bcb6a6a0, count: 14 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 *cpu0: kernel diagnostic assertion "pg->wire_count == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1326 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7b91bcb6a6a0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c41e760 rbx 0 rdx 0 rcx 0xffff8000fffeb248 rax 0x33 r8 0xffff80003c41e690 r9 0 r10 0x57b323439c225ef3 r11 0xda6c9b16cdbb72b7 r12 0 r13 0 r14 0xffff8000fffeb248 r15 0 rip 0xffffffff8151d3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c41e6e0 ss 0 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=66403 pid=38644 tcnt=1 stat=onproc flags process=10000010 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffeb778,0xffff8000fffea2c8 process=0xffff80003c423510 user=0xffff80003c419000, vmspace=0xfffffd806ccdc7c8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 54911 81918 84982 0 2 0x2 syz-executor 61062 192237 6201 32767 2 0x10 syz-executor 61062 135141 6201 32767 3 0x4000090 fsleep syz-executor 61062 268004 6201 32767 2 0x4000010 syz-executor 96699 69197 4631 32767 2 0x10 syz-executor 96699 484019 4631 32767 3 0x4000090 fsleep syz-executor 22649 94696 52786 32767 2 0x10 syz-executor 22649 379067 52786 32767 3 0x4000090 fsleep syz-executor 86867 487233 48586 32767 3 0x90 nanoslp syz-executor 86867 451785 48586 32767 3 0x4000090 fsleep syz-executor 86867 224474 48586 32767 3 0x4000090 fsleep syz-executor *38644 66403 33019 32767 7 0x10000010 syz-executor 48586 38088 79597 32767 3 0x90 nanoslp syz-executor 6201 328762 7828 32767 3 0x90 nanoslp syz-executor 4631 503103 59752 32767 3 0x90 nanoslp syz-executor 52786 301940 46102 32767 3 0x90 nanoslp syz-executor 80620 114170 12259 32767 3 0x90 nanoslp syz-executor 56793 234027 97896 32767 3 0x90 nanoslp syz-executor 7828 506180 84982 0 3 0x82 wait syz-executor 59752 146606 84982 0 3 0x82 wait syz-executor 79597 415650 84982 0 3 0x82 wait syz-executor 46102 131731 84982 0 3 0x82 wait syz-executor 33019 425989 84982 0 3 0x82 wait syz-executor 12259 338428 84982 0 3 0x82 wait syz-executor 97896 71874 84982 0 3 0x82 wait syz-executor 84982 52245 41540 0 3 0x82 kqread syz-executor 41540 345689 6207 0 3 0x10008a sigsusp ksh 6207 504859 12849 0 3 0x98 kqread sshd-session 12849 181801 77924 0 3 0x92 kqread sshd-session 52981 25271 1 0 3 0x100083 ttyin getty 77924 291195 1 0 3 0x88 kqread sshd 44448 351494 31585 73 3 0x1100090 kqread syslogd 31585 110956 1 0 3 0x100082 sbwait syslogd 56527 157254 1 0 3 0x100080 kqread resolvd 34398 510214 47529 77 3 0x100092 kqread dhcpleased 28879 397116 47529 77 3 0x100092 kqread dhcpleased 47529 8701 1 0 3 0x80 kqread dhcpleased 33146 301076 0 0 2 0x40014200 smr 46608 490704 0 0 2 0x14200 zerothread 81241 116118 0 0 3 0x14200 aiodoned aiodoned 57244 390026 0 0 3 0x14200 syncer update 68399 90413 0 0 3 0x14200 cleaner cleaner 43496 152644 0 0 2 0x14200 reaper 7129 105953 0 0 3 0x14200 pgdaemon pagedaemon 15140 160416 0 0 3 0x14200 bored viomb 14589 175973 0 0 3 0x40014200 acpi0 acpi0 4834 515815 0 0 3 0x40014200 idle1 9832 358020 0 0 3 0x14200 bored softnet1 30598 427011 0 0 3 0x14200 bored softnet0 18806 513212 0 0 3 0x14200 smrbar systqmp 12775 269463 0 0 3 0x14200 bored systq 50608 317215 0 0 3 0x14200 tmoslp softclockmp 16508 352786 0 0 3 0x40014200 tmoslp softclock 18879 410504 0 0 3 0x40014200 idle0 1 177099 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.pageqlock r = 0 (0xffffffff839e4168) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 uvm_pageclean+0x29c sys/uvm/uvm_page.c:980 #3 uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 #4 uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112 #5 amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1 #6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #7 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 #8 exit1+0x6fc sys/kern/kern_exit.c:260 #9 sys_exit+0x1a sys/kern/kern_exit.c:-1 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff838ea458) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 wakeup_n+0x54 sys/kern/kern_synch.c:581 #3 uvm_pmr_freepages+0x442 sys/uvm/uvm_pmemrange.c:1338 #4 uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112 #5 amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1 #6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #7 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 #8 exit1+0x6fc sys/kern/kern_exit.c:260 #9 sys_exit+0x1a sys/kern/kern_exit.c:-1 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff839e41a0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1 #3 uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112 #4 amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1 #5 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #6 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 #7 exit1+0x6fc sys/kern/kern_exit.c:260 #8 sys_exit+0x1a sys/kern/kern_exit.c:-1 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #10 Xsyscall+0x128 Process 54911 (syz-executor) thread 0xffff80003c42afb8 (81918) exclusive rrwlock inode r = 0 (0xfffffd806cb35a20) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806fb4b200) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 18806 (systqmp) thread 0xffff8000ffffe530 (513212) shared rwlock systqmp r = 0 (0xffffffff83828728) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10210 10958K 10973K 166960K 11305 0 pcb 17 12K 12K 166960K 17 0 rtable 215 6K 7K 166960K 349 0 pf 29 16K 16K 166960K 31 0 ifaddr 38 6K 7K 166960K 44 0 ifgroup 46 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 29 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1365 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 21 74K 121K 166960K 165 0 sigio 0 0K 0K 166960K 1 0 proc 59 115K 163K 166960K 474 0 subproc 63 3K 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 4 0 in_multi 88 6K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 211 943K 943K 166960K 211 0 exec 0 0K 1K 166960K 349 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 219 151K 191K 166960K 3142 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 42 84K 109K 166960K 1205 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 24 1K 2K 166960K 27 0 temp 31 8666K 8730K 166960K 3820 0 kqueue 13 20K 22K 166960K 24 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 36 0 33 1 0 1 1 0 8 0 rtentry 176 111 0 12 5 0 5 5 0 8 0 unpcb 144 40 0 22 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 14 0 10 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 78 0 70 2 0 2 2 0 8 1 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 9 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 0 29 0 29 29 0 8 0 art_table 40 453 0 0 5 0 5 5 0 8 0 art_node 32 111 0 11 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1580 0 64 95 0 95 95 0 8 0 ffsino 296 1580 0 64 117 0 117 117 0 8 0 nchpl 144 1787 0 90 63 0 63 63 0 8 0 vnodes 216 1670 0 0 93 0 93 93 0 8 0 namei 1024 5398 0 5397 2 0 2 2 0 8 1 percpumem 16 50 0 1 1 0 1 1 0 8 0 kstatmem 264 24 0 2 2 0 2 2 0 8 0 scxspl 216 5865 0 5865 3 1 2 2 1 8 2 plimitpl 152 40 0 16 2 0 2 2 0 8 0 sigapl 424 443 0 391 7 0 7 7 0 8 0 knotepl 120 53 0 0 2 0 2 2 0 8 0 kqueuepl 224 23 0 14 1 0 1 1 0 8 0 pipepl 344 115 0 88 3 0 3 3 0 8 0 fdescpl 528 427 0 394 3 0 3 3 0 8 0 filepl 160 1639 0 1441 12 0 12 12 0 8 1 lockfpl 104 8 0 6 1 0 1 1 0 8 0 lockfspl 48 5 0 3 1 0 1 1 0 8 0 sessionpl 144 22 0 7 1 0 1 1 0 8 0 pgrppl 48 32 0 9 1 0 1 1 0 8 0 ucredpl 104 204 0 186 1 0 1 1 0 8 0 zombiepl 144 394 0 391 1 0 1 1 0 8 0 processpl 1232 443 0 391 5 0 5 5 0 8 0 procpl 664 479 0 421 6 0 6 6 0 8 0 sockpl 752 154 0 125 4 0 4 4 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 174 0 0 11 0 11 11 0 8 0 bufpl 280 2269 0 118 154 0 154 154 0 8 0 anonpl 32 5133 0 0 42 0 42 42 0 246 0 amapchunkpl 152 9127 0 8689 33 0 33 33 0 158 12 amappl16 200 1622 0 1606 5 0 5 5 0 8 3 amappl15 192 10 0 10 1 0 1 1 0 8 1 amappl14 184 5 0 5 1 0 1 1 0 8 1 amappl13 176 395 0 394 1 0 1 1 0 8 0 amappl12 168 752 0 711 3 0 3 3 0 8 0 amappl11 160 4 0 4 1 0 1 1 0 8 1 amappl10 152 47 0 36 1 0 1 1 0 8 0 amappl9 144 255 0 255 1 0 1 1 0 8 1 amappl8 136 33 0 32 1 0 1 1 0 8 0 amappl7 128 74 0 73 1 0 1 1 0 8 0 amappl6 120 260 0 249 1 0 1 1 0 8 0 amappl5 112 82 0 75 1 0 1 1 0 8 0 amappl4 104 359 0 337 1 0 1 1 0 8 0 amappl3 96 1373 0 1275 4 0 4 4 0 8 1 amappl2 88 493 0 441 2 0 2 2 0 8 0 amappl1 80 8717 0 8164 14 0 14 14 0 8 0 amappl 88 2462 0 2313 5 0 5 5 0 92 0 uvmvnodes 80 98 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 427 0 394 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 427 0 394 1 0 1 1 0 8 0 vmmpekpl 168 5005 0 4956 3 0 3 3 0 8 0 vmmpepl 168 34920 0 33103 94 0 94 94 0 357 4 vmsppl 488 426 0 392 7 1 6 6 0 8 0 rwobjpl 80 12725 0 11842 22 0 22 22 0 8 0 pdppl 4096 862 0 784 106 10 96 96 0 8 18 pvpl 32 10992 0 0 90 1 89 89 0 265 0 pmappl 256 426 0 392 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 277 0 13 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837cfff0) 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 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682 acpitimer_delay(1) at acpitimer_delay+0x76 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline] acpitimer_delay(1) at acpitimer_delay+0x76 sys/dev/acpi/acpitimer.c:120 comcnputc(800,6b) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(6b) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(6b) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff833879ad) at db_printf+0x9b sys/kern/subr_prf.c:-1 panic(ffffffff833b03e7) at panic+0x103 sys/kern/subr_prf.c:217 __assert(ffffffff833f1046,ffffffff8333fc7a,52e,ffffffff834071a1) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagedequeue(fffffd80088bde90) at uvm_pagedequeue+0x2dd sys/uvm/uvm_page.c:1324 uvm_pageclean(fffffd80088bde90) at uvm_pageclean+0x2ad sys/uvm/uvm_page.c:981 end trace frame: 0xffff800031fdcaf0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837cfff0) 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 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682 acpitimer_delay(1) at acpitimer_delay+0x76 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline] acpitimer_delay(1) at acpitimer_delay+0x76 sys/dev/acpi/acpitimer.c:120 comcnputc(800,6b) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(6b) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(6b) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff833879ad) at db_printf+0x9b sys/kern/subr_prf.c:-1 panic(ffffffff833b03e7) at panic+0x103 sys/kern/subr_prf.c:217 __assert(ffffffff833f1046,ffffffff8333fc7a,52e,ffffffff834071a1) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pagedequeue(fffffd80088bde90) at uvm_pagedequeue+0x2dd sys/uvm/uvm_page.c:1324 uvm_pageclean(fffffd80088bde90) at uvm_pageclean+0x2ad sys/uvm/uvm_page.c:981 uvm_pagefree(fffffd80088bde90) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020 uvm_anfree(fffffd806d430490) at uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112 amap_wipeout(fffffd806df558a0) at amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1 uvm_unmap_detach(ffff800031fdcbf0,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 uvm_map_teardown(fffffd806cb21400) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525 exit1(ffff8000fffea7e8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff8000fffea7e8,ffff800031fdcdc0,ffff800031fdcd10) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800031fdcdc0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800031fdcdc0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79b933bd5a20, count: -23 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7b91bcb6a6a0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7b91bcb6a6a0, count: -1