panic: kernWAeRl NG:i SgPnLo sNOic asseRErD Oo YSCgA-L>Lw i13e7_ c6o9u3nt9!= 0"X ITfai0le : Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *520623 32324 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7de8295b4ec0, 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/multicore/kernel/sys/uvm/uvm_page.c", line 1250 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7de8295b4ec0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2cadf0 rbx 0 rdx 0 rcx 0xffff80002a222540 rax 0x3b r8 0xffff80002a2cad20 r9 0xffff80002a2ca9e8 r10 0x26f88d58dc162d65 r11 0x3fc2d6fd869a2329 r12 0 r13 0 r14 0xffff80002a222540 r15 0 rip 0xffffffff821093ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2cad70 ss 0 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=520623 pid=32324 tcnt=1 stat=onproc flags process=2 proc=0 runpri=17, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2222a8,0xffff80002a2227e8 process=0xffff8000ffff2690 user=0xffff80002a2c5000, vmspace=0xfffffd8073c97b78 estcpu=36, cpticks=39, pctcpu=0.22, user=0, sys=29, intr=9 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 90871 173890 57033 0 2 0 syz-executor 90871 239497 57033 0 3 0x4000080 fsleep syz-executor 90871 479874 57033 0 3 0x4000080 fsleep syz-executor 90871 215456 57033 0 3 0x4000080 fsleep syz-executor 9329 10665 1 0 3 0x82 nanoslp getty 93649 84086 27080 0 2 0x10 syz-executor 93649 325235 27080 0 3 0x4000090 fsleep syz-executor 93649 64066 27080 0 2 0x4000010 syz-executor 71380 376751 28309 0 2 0 syz-executor 71380 432349 28309 0 2 0x4000000 syz-executor 71380 433231 28309 0 3 0x4000080 fsleep syz-executor 92190 293829 73445 0 2 0 syz-executor 92190 384918 73445 0 3 0x4000080 fsleep syz-executor 18541 377658 37025 0 2 0 syz-executor 18541 265881 37025 0 2 0x4000000 syz-executor 32662 54645 40291 0 2 0 syz-executor 32662 135323 40291 0 3 0x4000080 fsleep syz-executor 73445 374629 41309 0 3 0x82 nanoslp syz-executor 52379 480827 41309 0 3 0x82 nanoslp syz-executor 37025 265200 41309 0 3 0x82 nanoslp syz-executor 57033 430889 41309 0 3 0x82 nanoslp syz-executor 28309 359302 41309 0 3 0x82 nanoslp syz-executor 27080 33411 41309 0 3 0x82 nanoslp syz-executor *32324 520623 41309 0 7 0x2 syz-executor 40291 158229 41309 0 3 0x82 nanoslp syz-executor 41309 330725 1 0 3 0x82 kqread syz-executor 87141 243932 0 0 3 0x14200 bored smr 66581 161752 0 0 3 0x14200 pgzero zerothread 40528 441580 0 0 3 0x14200 aiodoned aiodoned 39236 489657 0 0 3 0x14200 syncer update 78985 92985 0 0 3 0x14200 cleaner cleaner 75941 53584 0 0 2 0x14200 reaper 12814 202691 0 0 3 0x14200 pgdaemon pagedaemon 94494 453440 0 0 3 0x14200 bored viomb 33977 442614 0 0 3 0x40014200 acpi0 acpi0 88869 419953 0 0 3 0x40014200 idle1 21914 270520 0 0 3 0x14200 bored softnet1 6838 117002 0 0 3 0x14200 bored softnet0 93020 155000 0 0 3 0x14200 bored systqmp 46743 18803 0 0 3 0x14200 bored systq 56092 11903 0 0 3 0x14200 tmoslp softclockmp 52844 286912 0 0 3 0x40014200 tmoslp softclock 64617 355190 0 0 3 0x40014200 idle0 1 76686 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex nchpl r = 0 (0xffffffff839f3af0) #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 pool_put+0xa6 sys/kern/subr_pool.c:803 #3 cache_zap+0x310 sys/kern/vfs_cache.c:124 #4 cache_purge+0xe8 namecache_rb_cache_RBT_ROOT sys/kern/vfs_cache.c:-1 [inline] #4 cache_purge+0xe8 sys/kern/vfs_cache.c:440 #5 ufs_rmdir+0x298 sys/ufs/ufs/ufs_vnops.c:1261 #6 VOP_RMDIR+0x192 sys/kern/vfs_vops.c:413 #7 dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1926 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 32324 (syz-executor) thread 0xffff80002a222540 (520623) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839ffcc0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 #2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369 #3 biowait+0xc6 sys/kern/vfs_bio.c:1242 #4 bwrite+0x2e7 sys/kern/vfs_bio.c:754 #5 ufs_dirremove+0x290 sys/ufs/ufs/ufs_lookup.c:919 #6 ufs_rmdir+0x238 sys/ufs/ufs/ufs_vnops.c:1248 #7 VOP_RMDIR+0x192 sys/kern/vfs_vops.c:413 #8 dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1926 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806de2a420) #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:576 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1893 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80742a3678) #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:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1893 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 exclusive mutex nchpl r = 0 (0xffffffff839f3af0) #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 pool_put+0xa6 sys/kern/subr_pool.c:803 #3 cache_zap+0x310 sys/kern/vfs_cache.c:124 #4 cache_purge+0xe8 namecache_rb_cache_RBT_ROOT sys/kern/vfs_cache.c:-1 [inline] #4 cache_purge+0xe8 sys/kern/vfs_cache.c:440 #5 ufs_rmdir+0x298 sys/ufs/ufs/ufs_vnops.c:1261 #6 VOP_RMDIR+0x192 sys/kern/vfs_vops.c:413 #7 dounlinkat+0x2e0 sys/kern/vfs_syscalls.c:1926 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 75941 (reaper) thread 0xffff8000ffffdc90 (53584) exclusive rwlock kmmaplk r = 0 (0xffffffff83ae18b8) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvm_unmap+0x7d sys/uvm/uvm_map.c:1798 #4 km_free+0x87 sys/uvm/uvm_km.c:714 #5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 #6 reaper+0x1ca sys/kern/kern_exit.c:493 #7 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11080 12033K 12481K 166960K 12591 0 pcb 17 13K 14K 166960K 124 0 rtable 161 6K 8K 166960K 402 0 pf 32 17K 24K 166960K 126 0 ifaddr 28 4K 7K 166960K 62 0 ifgroup 47 2K 2K 166960K 100 0 sysctl 3 1K 9K 166960K 9 0 counters 66 36K 37K 166960K 100 0 ioctlops 0 0K 4K 166960K 1573 0 iov 0 0K 16K 166960K 44 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1351 85K 85K 166960K 1722 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 23 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 57K 93K 166960K 456 0 sigio 1 0K 0K 166960K 8 0 proc 20 33K 164K 166960K 600 0 subproc 72 4K 4K 166960K 73 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 37 0 in_multi 51 3K 7K 166960K 104 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 229 1023K 1023K 166960K 229 0 exec 0 0K 1K 166960K 399 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 141 84K 180K 166960K 5943 0 UVM aobj 22 2K 2K 166960K 22 0 pinsyscall 18 36K 104K 166960K 1633 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 13 0 NDP 10 0K 2K 166960K 40 0 temp 56 9119K 9196K 166960K 20587 0 kqueue 2 4K 26K 166960K 66 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 55 0 55 1 0 1 1 0 8 1 rtentry 176 116 0 54 6 0 6 6 0 8 0 unpcb 144 197 0 194 2 0 2 2 0 8 1 syncache 336 7 0 7 1 1 0 1 0 8 0 tcpcb 736 89 0 88 1 0 1 1 0 8 0 arp 136 19 0 8 1 0 1 1 0 8 0 inpcb 328 389 0 386 4 2 2 4 0 8 0 nd6 152 25 0 15 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 7 0 7 1 1 0 1 0 8 0 pppxif 1576 3 0 3 1 1 0 1 0 8 0 pfstscr 40 3 0 3 2 1 1 1 0 8 1 pffrag 232 5 0 1 1 0 1 1 0 482 0 pffrnode 88 3 0 1 1 0 1 1 0 8 0 pffrent 40 6 0 2 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfanchor 1288 4 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 320 1 0 1 1 1 0 1 0 8 0 pfstitem 24 38 0 2 1 0 1 1 0 8 0 pfstkey 128 41 0 5 2 0 2 2 0 8 0 pfstate 448 40 0 4 5 0 5 5 0 8 0 pfrule 1360 24 0 20 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 478 0 218 30 1 29 30 0 8 5 art_table 40 480 0 218 5 0 5 5 0 8 0 art_node 32 116 0 59 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 10 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 72 21 0 11 1 0 1 1 0 8 0 shmpl 112 19 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2185 0 722 93 0 93 93 0 8 0 ffsino 296 2185 0 722 114 0 114 114 0 8 0 nchpl 144 2819 0 1115 64 0 64 64 0 8 0 vnodes 216 2507 0 0 140 0 140 140 0 8 0 namei 1024 9517 0 9517 10 2 8 8 0 8 8 percpumem 16 65 0 17 1 0 1 1 0 8 0 kstatmem 264 53 0 28 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 11102 0 11102 4 3 1 3 1 8 1 plimitpl 152 98 0 86 1 0 1 1 0 8 0 sigapl 424 778 0 742 7 1 6 7 0 8 0 knotepl 120 322 0 0 10 0 10 10 0 8 0 kqueuepl 224 176 0 173 5 4 1 5 0 8 0 pipepl 344 151 0 123 4 1 3 4 0 8 0 fdescpl 528 762 0 744 3 0 3 3 0 8 0 filepl 160 3757 0 3597 19 3 16 16 0 8 6 lockfpl 104 247 0 247 2 0 2 2 0 8 2 lockfspl 48 53 0 53 1 0 1 1 0 8 1 sessionpl 144 40 0 36 1 0 1 1 0 8 0 pgrppl 48 52 0 40 1 0 1 1 0 8 0 ucredpl 104 467 0 462 1 0 1 1 0 8 0 zombiepl 144 790 0 788 2 1 1 1 0 8 0 processpl 1232 778 0 742 5 0 5 5 0 8 0 procpl 664 1335 0 1288 6 0 6 6 0 8 0 sockpl 752 654 0 648 8 3 5 7 0 8 2 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 164 0 0 11 0 11 11 0 8 0 bufpl 280 8363 0 2032 453 0 453 453 0 8 0 anonpl 32 9995 0 0 81 0 81 81 0 246 0 amapchunkpl 152 18584 0 17962 34 2 32 32 0 158 0 amappl16 200 2088 0 2063 17 14 3 15 0 8 0 amappl15 192 10 0 10 2 1 1 1 0 8 1 amappl14 184 469 0 469 1 0 1 1 0 8 1 amappl13 176 125 0 123 1 0 1 1 0 8 0 amappl12 168 1012 0 993 2 0 2 2 0 8 0 amappl11 160 4 0 4 1 1 0 1 0 8 0 amappl10 152 72 0 72 1 0 1 1 0 8 1 amappl9 144 279 0 278 2 1 1 1 0 8 0 amappl8 136 116 0 115 1 0 1 1 0 8 0 amappl7 128 153 0 151 1 0 1 1 0 8 0 amappl6 120 153 0 153 1 0 1 1 0 8 1 amappl5 112 101 0 100 1 0 1 1 0 8 0 amappl4 104 320 0 316 1 0 1 1 0 8 0 amappl3 96 3652 0 3570 5 1 4 4 0 8 0 amappl2 88 557 0 545 2 0 2 2 0 8 0 amappl1 80 12488 0 12365 18 4 14 18 0 8 7 amappl 88 5103 0 4981 6 1 5 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 dma2048 2048 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 128 254 0 254 2 2 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 21 0 0 1 0 1 1 0 8 0 uaddrrnd 24 762 0 743 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 762 0 743 1 0 1 1 0 8 0 vmmpekpl 168 8362 0 8322 3 1 2 3 0 8 0 vmmpepl 168 57466 0 56590 98 10 88 98 0 357 28 vmsppl 488 761 0 742 5 1 4 5 0 8 0 rwobjpl 80 18700 0 18247 27 1 26 27 0 8 3 pdppl 4096 1531 0 1484 105 34 71 85 0 8 24 pvpl 32 28942 0 0 235 1 234 234 0 265 0 pmappl 256 761 0 742 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 293 0 42 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8399dff0) 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(800,20) at comcnputc+0x29b sys/dev/ic/com.c:1274 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(66) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(66) at db_putchar+0x126 sys/ddb/db_output.c:153 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834917c0) at db_printf+0x9b sys/kern/subr_prf.c:-1 panic(ffffffff834b85bc) at panic+0x103 sys/kern/subr_prf.c:217 __assert(ffffffff834f5b3b,ffffffff834e49b2,4e2,ffffffff834468b7) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8008ea3bb0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806b326d78,e7f834aa000,e7f834ab000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 end trace frame: 0xffff80003a3c9ca0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8399dff0) 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(800,20) at comcnputc+0x29b sys/dev/ic/com.c:1274 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(66) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(66) at db_putchar+0x126 sys/ddb/db_output.c:153 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834917c0) at db_printf+0x9b sys/kern/subr_prf.c:-1 panic(ffffffff834b85bc) at panic+0x103 sys/kern/subr_prf.c:217 __assert(ffffffff834f5b3b,ffffffff834e49b2,4e2,ffffffff834468b7) at __assert+0x29 sys/kern/subr_prf.c:-1 uvm_pageunwire(fffffd8008ea3bb0) at uvm_pageunwire+0x17d sys/uvm/uvm_page.c:1249 uvm_fault_unwire_locked(fffffd806b326d78,e7f834aa000,e7f834ab000) at uvm_fault_unwire_locked+0x33a sys/uvm/uvm_fault.c:1790 uvm_unmap_kill_entry_withlock(fffffd806b326d78,fffffd806685eb70,0) at uvm_unmap_kill_entry_withlock+0x81 sys/uvm/uvm_map.c:1866 uvm_map_teardown(fffffd806b326d78) at uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] uvm_map_teardown(fffffd806b326d78) at uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 exit1(ffff80003c3e67f0,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260 sys_exit(ffff80003c3e67f0,ffff80003a3c9e80,ffff80003a3c9dd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003a3c9e80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a3c9e80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d46ae0a21c0, count: -20 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7de8295b4ec0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7de8295b4ec0, count: -1 ddb{1}>