uvm_fault(0xfffffd806ecae008, 0x18, 0, 1) -> e kernel: page fault trap, code=0 Stopped at checkalias+0xb7: movl 0x18(%r13),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND * 56759 4863 0 0x8000000 0x4000000 0 syz-executor 470861 88351 0 0x8000002 0 1 syz-executor checkalias(fffffd80723dc550,31700,0) at checkalias+0xb7 sys/kern/vfs_subr.c:564 cdevvp(31700,ffff8000371e8cc0) at cdevvp+0xd2 sys/kern/vfs_subr.c:507 spec_open_clone(ffff8000371e8d98) at spec_open_clone+0x1ee sys/kern/spec_vnops.c:711 spec_open(ffff8000371e8d98) at spec_open+0x326 sys/kern/spec_vnops.c:148 VOP_OPEN(fffffd806ee0f6f0,1,fffffd807f7d3478,ffff8000371fb720) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 vn_open(ffff8000371e8fe8,1,0) at vn_open+0x708 sys/kern/vfs_vnops.c:177 doopenat(ffff8000371fb720,ffffff9c,200000c0,0,0,ffff8000371e9190) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123 syscall(ffff8000371e9240) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371e9240) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcf4f9f1ef40, count: 6 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: uvm_fault(0xfffffd806ecae008, 0x18, 0, 1) -> e ddb{0}> trace checkalias(fffffd80723dc550,31700,0) at checkalias+0xb7 sys/kern/vfs_subr.c:564 cdevvp(31700,ffff8000371e8cc0) at cdevvp+0xd2 sys/kern/vfs_subr.c:507 spec_open_clone(ffff8000371e8d98) at spec_open_clone+0x1ee sys/kern/spec_vnops.c:711 spec_open(ffff8000371e8d98) at spec_open+0x326 sys/kern/spec_vnops.c:148 VOP_OPEN(fffffd806ee0f6f0,1,fffffd807f7d3478,ffff8000371fb720) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 vn_open(ffff8000371e8fe8,1,0) at vn_open+0x708 sys/kern/vfs_vnops.c:177 doopenat(ffff8000371fb720,ffffff9c,200000c0,0,0,ffff8000371e9190) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123 syscall(ffff8000371e9240) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371e9240) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcf4f9f1ef40, count: -9 ddb{0}> show registers rdi 0x41700 acpi_pdirpa+0x2d571 rsi 0x31700 acpi_pdirpa+0x1d571 rbp 0xffff8000371e8c40 rbx 0x41700 acpi_pdirpa+0x2d571 rdx 0 rcx 0xffff8000371fb720 rax 0xffffffff8346eff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0xffffffffffffffff r10 0xb824fa05902d5941 r11 0xcf9621d93d3ffb55 r12 0x31700 acpi_pdirpa+0x1d571 r13 0 r14 0x31700 acpi_pdirpa+0x1d571 r15 0xfffffd8074aa2be8 rip 0xffffffff81144897 checkalias+0xb7 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000371e8bd0 ss 0x10 checkalias+0xb7: movl 0x18(%r13),%ebx ddb{0}> show proc PROC (syz-executor) tid=56759 pid=4863 tcnt=2 stat=onproc flags process=8000000 proc=4000000 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000371fa7f0,0xffffffff8359c458 process=0xffff8000ffff9690 user=0xffff8000371e4000, vmspace=0xfffffd806ecae008 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 73561 289443 40674 0 2 0x8000000 syz-executor 44351 237595 59125 0 2 0x8000000 syz-executor 4863 333742 88351 0 2 0x8000000 syz-executor * 4863 56759 88351 0 7 0xc000000 syz-executor 72474 166216 50408 0 2 0x8000000 syz-executor 72474 20245 50408 0 3 0xc000000 smrbar syz-executor 13834 426075 38193 0 2 0x8000000 syz-executor 23112 84379 34644 0 2 0x8000000 syz-executor 23112 217195 34644 0 3 0xc000080 fsleep syz-executor 59448 5718 5276 0 2 0x8000000 syz-executor 59448 339770 5276 0 3 0xc000080 fsleep syz-executor 38193 307682 43430 0 2 0x8000482 syz-executor 88351 470861 43430 0 7 0x8000002 syz-executor 5276 21443 43430 0 2 0x8000002 syz-executor 50408 500564 43430 0 3 0x8000082 nanoslp syz-executor 34644 187277 43430 0 3 0x8000082 nanoslp syz-executor 59125 14391 43430 0 2 0x8000482 syz-executor 40674 248906 43430 0 3 0x8000082 nanoslp syz-executor 44311 449577 43430 0 2 0x8000002 syz-executor 8998 258620 0 0 3 0x14200 bored sosplice 43430 97519 57932 0 2 0x8000002 syz-executor 57932 476554 97695 0 3 0x810008a sigsusp ksh 97695 270012 61150 0 3 0x18000098 kqread sshd-session 61150 207351 68424 0 3 0x18000092 kqread sshd-session 20984 281650 1 0 3 0x18100083 ttyin getty 68424 94571 1 0 3 0x18000088 kqread sshd 35718 61076 19906 74 3 0x19100092 bpf pflogd 19906 405527 1 0 3 0x18000080 sbwait pflogd 38309 63090 48577 73 3 0x19100090 kqread syslogd 48577 228417 1 0 3 0x18100082 sbwait syslogd 55349 28334 1 0 3 0x18100080 kqread resolvd 46879 93275 2659 77 3 0x18100092 kqread dhcpleased 76182 89801 2659 77 3 0x18100092 kqread dhcpleased 2659 376280 1 0 3 0x18000080 kqread dhcpleased 1222 502379 0 0 3 0x14200 bored smr 21868 262675 0 0 2 0x14200 zerothread 8806 47 0 0 3 0x14200 aiodoned aiodoned 18657 176452 0 0 3 0x14200 syncer update 55074 170141 0 0 3 0x14200 cleaner cleaner 53063 127154 0 0 3 0x14200 reaper reaper 75949 385466 0 0 3 0x14200 pgdaemon pagedaemon 56540 88190 0 0 3 0x14200 bored viomb 93379 229116 0 0 3 0x40014200 acpi0 acpi0 18067 264562 0 0 3 0x40014200 idle1 48696 10716 0 0 3 0x14200 bored softnet3 42731 485739 0 0 3 0x14200 bored softnet2 81201 213223 0 0 3 0x14200 bored softnet1 43955 127922 0 0 3 0x14200 bored softnet0 32016 153443 0 0 3 0x14200 bored systqmp 79484 5220 0 0 3 0x14200 bored systq 36398 328307 0 0 3 0x14200 tmoslp softclockmp 21725 397729 0 0 2 0x40014200 softclock 91953 181480 0 0 3 0x40014200 idle0 1 140349 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 4863 (syz-executor) thread 0xffff8000371fb720 (56759) exclusive rrwlock inode r = 0 (0xfffffd806ec6d700) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:676 #6 cache_lookup+0x36e sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x218 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #10 namei+0x7aa sys/kern/vfs_lookup.c:250 #11 vn_open+0x13f sys/kern/vfs_vnops.c:140 #12 doopenat+0x31d sys/kern/vfs_syscalls.c:1123 #13 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #13 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8359b950) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 syscall+0xad6 mi_syscall sys/sys/syscall_mi.h:179 [inline] #1 syscall+0xad6 sys/arch/amd64/amd64/trap.c:577 #2 Xsyscall+0x128 Process 44311 (syz-executor) thread 0xffff800037273c18 (449577) exclusive rrwlock inode r = 0 (0xfffffd806ffcc2c8) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x171 sys/ufs/ufs/ufs_ihash.c:95 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #13 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #13 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807346b708) #0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #8 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] #8 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10236 10246K 10703K 166960K 14365 0 pcb 17 15K 16K 166960K 327 0 rtable 216 16K 17K 166960K 3470 0 pf 42 19K 26K 166960K 437 0 ifaddr 40 8K 9K 166960K 477 0 ifgroup 58 2K 2K 166960K 527 0 sysctl 4 1K 1K 166960K 6 0 counters 66 36K 37K 166960K 314 0 ioctlops 0 0K 4K 166960K 1801 0 iov 0 0K 16K 166960K 124 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1497 94K 95K 166960K 4614 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 33 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 141 0 dirhash 15 2K 3K 166960K 48 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 17 61K 97K 166960K 2901 0 sigio 0 0K 0K 166960K 69 0 proc 70 91K 128K 166960K 3403 0 subproc 104 6K 6K 166960K 1391 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 246 0 in_multi 87 6K 7K 166960K 1227 0 ether_multi 1 0K 0K 166960K 12 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 2041 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 229 74K 110K 166960K 23369 0 UVM aobj 68 8K 8K 166960K 69 0 pinsyscall 42 84K 106K 166960K 6554 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 98 0 NDP 15 0K 2K 166960K 351 0 temp 75 6816K 6885K 166960K 72866 0 kqueue 13 20K 28K 166960K 243 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 404 0 400 3 2 1 3 0 8 0 rtentry 112 1239 0 1146 5 2 3 4 0 8 0 unpcb 144 1959 0 1942 24 22 2 6 0 8 1 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 808 774 0 770 30 29 1 8 0 8 0 arp 120 221 0 205 1 0 1 1 0 8 0 inpcb 336 2893 0 2885 46 44 2 12 0 8 1 nd6 136 342 0 316 2 1 1 2 0 8 0 pkpcb 40 9 0 9 6 5 1 1 0 8 1 kcovpl 48 107 0 99 1 0 1 1 0 8 0 ppxss 1168 18 0 17 7 6 1 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 3 0 3 1 1 0 1 0 482 0 pffrnode 88 3 0 3 1 1 0 1 0 8 0 pffrent 40 4 0 4 1 1 0 1 0 8 0 pfosfp 40 1430 0 1006 5 0 5 5 0 8 0 pfosfpen 112 1430 0 715 21 0 21 21 0 8 0 pfrktable 1344 10 0 7 2 1 1 1 0 8 0 pfanchor 1288 12 0 6 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfqueue 264 1 0 1 1 1 0 1 0 8 0 pfstitem 24 102 0 94 1 0 1 1 0 8 0 pfstkey 128 111 0 102 2 0 2 2 0 8 0 pfstate 376 102 0 97 5 3 2 5 0 8 0 pfrule 1344 102 0 27 8 1 7 7 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 4948 0 4539 35 9 26 29 0 8 0 art_table 32 4950 0 4539 4 0 4 4 0 8 0 art_node 16 1235 0 1151 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 5 1 0 1 1 0 8 0 semapl 112 139 0 129 1 0 1 1 0 8 0 shmpl 112 66 0 1 2 0 2 2 0 8 0 dirhash 1024 42 0 23 3 0 3 3 0 8 0 dino2pl 256 4581 0 2883 108 1 107 107 0 8 0 ffsino 272 4581 0 2883 114 0 114 114 0 8 0 nchpl 144 6868 0 5032 69 0 69 69 0 8 0 uvmvnodes 80 7171 0 0 147 0 147 147 0 8 0 vnodes 216 7171 0 0 399 0 399 399 0 8 0 vnodes: pool(0xffffffff834efdd8:vnodes): page inconsistency: page 0x0; at page head addr 0xfffffd8074aa2f90 (p 0xfffffd8074aa2000) namei 1024 36824 0 36824 9 8 1 2 0 8 1 percpumem 16 171 0 124 1 0 1 1 0 8 0 vcpupl 3904 6 0 2 1 0 1 1 0 8 0 vmpool 696 10 0 6 1 0 1 1 0 8 0 pfiaddrpl 120 67 0 2 3 1 2 2 0 8 0 kstatmem 264 274 0 248 3 0 3 3 0 8 0 scsiplug 72 6 0 6 4 3 1 1 0 8 1 scxspl 216 60067 0 60067 15 14 1 8 1 8 1 plimitpl 152 781 0 764 1 0 1 1 0 8 0 sigapl 424 3027 0 2977 11 4 7 9 0 8 0 futexpl 64 25257 0 25255 8 7 1 1 0 8 0 knotepl 120 730 0 0 17 0 17 17 0 8 0 kqueuepl 216 754 0 745 18 15 3 5 0 8 2 pipepl 320 756 0 729 12 9 3 8 0 8 0 fdescpl 496 2986 0 2955 9 4 5 6 0 8 0 filepl 152 20989 0 20745 69 53 16 22 0 8 5 lockfpl 104 605 0 603 1 0 1 1 0 8 0 lockfspl 48 230 0 228 1 0 1 1 0 8 0 sessionpl 144 121 0 112 1 0 1 1 0 8 0 pgrppl 48 250 0 233 1 0 1 1 0 8 0 ucredpl 104 3368 0 3354 1 0 1 1 0 8 0 zombiepl 144 2977 0 2977 2 1 1 1 0 8 1 processpl 1152 3027 0 2977 6 2 4 6 0 8 0 procpl 648 5506 0 5452 12 6 6 8 0 8 0 srpgc 96 10 0 10 4 4 0 1 0 8 0 sosppl 168 7 0 7 5 5 0 1 0 8 0 sockpl 664 5280 0 5251 71 67 4 15 0 8 0 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 248 0 0 28 2 26 28 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 409 0 0 20 0 20 20 0 8 0 bufpl 280 12201 0 3505 622 0 622 622 0 8 0 anonpl 24 451316 0 445524 120 58 62 88 0 185 14 amapchunkpl 152 74797 0 74233 84 52 32 46 0 158 7 amappl16 200 8283 0 8231 71 55 16 16 0 8 10 amappl15 192 14 0 14 1 1 0 1 0 8 0 amappl14 184 312 0 300 1 0 1 1 0 8 0 amappl13 176 15 0 14 1 0 1 1 0 8 0 amappl12 168 5210 0 5181 4 2 2 3 0 8 0 amappl11 160 60 0 46 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 1 0 1 0 8 0 amappl9 144 130 0 130 3 3 0 1 0 8 0 amappl8 136 27 0 24 1 0 1 1 0 8 0 amappl7 128 305 0 292 1 0 1 1 0 8 0 amappl6 120 1159 0 1157 1 0 1 1 0 8 0 amappl5 112 531 0 520 1 0 1 1 0 8 0 amappl4 104 609 0 591 1 0 1 1 0 8 0 amappl3 96 14213 0 14112 5 1 4 4 0 8 1 amappl2 88 2019 0 1953 2 0 2 2 0 8 0 amappl1 80 22108 0 21529 18 5 13 14 0 8 0 amappl 88 22156 0 21992 5 0 5 5 0 92 0 dma4096 4096 2 0 2 2 2 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 68 0 1 2 0 2 2 0 8 0 uaddrrnd 24 2996 0 2961 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2996 0 2961 1 0 1 1 0 8 0 vmmpekpl 168 26699 0 26642 4 0 4 4 0 8 0 vmmpepl 168 191069 0 189184 137 39 98 98 0 357 13 vmsppl 440 2995 0 2961 7 2 5 5 0 8 1 rwobjpl 56 61729 0 53531 122 3 119 119 0 8 3 pdppl 4096 5999 0 5926 247 171 76 87 0 8 3 pvpl 32 46870 0 0 379 2 377 377 0 265 0 pmappl 248 2995 0 2961 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 659 0 275 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace checkalias(fffffd80723dc550,31700,0) at checkalias+0xb7 sys/kern/vfs_subr.c:564 cdevvp(31700,ffff8000371e8cc0) at cdevvp+0xd2 sys/kern/vfs_subr.c:507 spec_open_clone(ffff8000371e8d98) at spec_open_clone+0x1ee sys/kern/spec_vnops.c:711 spec_open(ffff8000371e8d98) at spec_open+0x326 sys/kern/spec_vnops.c:148 VOP_OPEN(fffffd806ee0f6f0,1,fffffd807f7d3478,ffff8000371fb720) at VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 vn_open(ffff8000371e8fe8,1,0) at vn_open+0x708 sys/kern/vfs_vnops.c:177 doopenat(ffff8000371fb720,ffffff9c,200000c0,0,0,ffff8000371e9190) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123 syscall(ffff8000371e9240) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff8000371e9240) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcf4f9f1ef40, count: -9 ddb{0}> machine ddbcpu 1