*cpu0: uvm_fault(0xfffffd806b9dc5d0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75a5d528b4c0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c039420 rbx 0 rdx 0 rcx 0xffff80003c03cfb8 rax 0x3b r8 0xffff80003c039350 r9 0 r10 0x5fb79f5685756626 r11 0xcc3c6e05928ff45b r12 0 r13 0 r14 0xffff80003c03cfb8 r15 0 rip 0xffffffff8311d3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c0393a0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=155843 pid=31122 tcnt=4 stat=onproc flags process=0 proc=0 runpri=50, usrpri=58, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c03d4e8,0xffff80003c03cd30 process=0xffff800036824020 user=0xffff80003c034000, vmspace=0xfffffd806b9dc5d0 estcpu=8, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *31122 155843 14555 0 7 0 syz-executor 31122 96405 14555 0 3 0x4000080 fsleep syz-executor 31122 6555 14555 0 3 0x4000080 fsleep syz-executor 31122 508062 14555 0 7 0x4000000 syz-executor 90565 464326 65658 0 4 0x82000 syz-executor 90565 8181 65658 0 4 0x4082000 syz-executor 90565 316832 65658 0 2 0x4002000 syz-executor 69200 16337 2941 0 2 0x1000000 syz-executor 69200 48350 2941 0 3 0x5000080 kqpoll syz-executor 69200 22215 2941 0 3 0x5000080 fsleep syz-executor 3376 205146 52051 0 3 0x80 nanoslp syz-executor 3376 124289 52051 0 3 0x4000080 wsevent_read syz-executor 3376 521226 52051 0 3 0x4000080 fsleep syz-executor 78874 196780 14716 0 3 0x80 nanoslp syz-executor 78874 371240 14716 0 3 0x4000080 sbwait syz-executor 78874 178265 14716 0 3 0x4000080 fsleep syz-executor 77538 324526 40865 0 3 0x80 nanoslp syz-executor 77538 201545 40865 0 2 0x4000000 syz-executor 77538 258846 40865 0 3 0x4000080 fsleep syz-executor 77538 167881 40865 0 3 0x4000080 fsleep syz-executor 58321 482588 4315 0 2 0 syz-executor 58321 170936 4315 0 3 0x4000080 kqread syz-executor 58321 365707 4315 0 3 0x4000080 fsleep syz-executor 58321 324335 4315 0 3 0x4000080 fsleep syz-executor 82124 293178 0 0 3 0x14200 bored sosplice 40865 71791 53525 0 3 0x82 nanoslp syz-executor 2941 335218 53525 0 2 0xc82 syz-executor 4315 50508 53525 0 3 0x82 nanoslp syz-executor 65658 370800 53525 0 3 0x82 nanoslp syz-executor 46149 283567 53525 0 3 0x82 wait syz-executor 52051 78552 53525 0 3 0x82 nanoslp syz-executor 14555 344408 53525 0 2 0xc82 syz-executor 14716 6758 53525 0 3 0x82 nanoslp syz-executor 53525 360977 77349 0 3 0x82 kqread syz-executor 77349 212945 84142 0 3 0x10008a sigsusp ksh 84142 270205 50211 0 3 0x98 kqread sshd-session 50211 45694 89588 0 3 0x92 kqread sshd-session 23420 266910 1 0 3 0x100083 ttyin getty 89588 107574 1 0 3 0x88 kqread sshd 74298 43144 77218 74 3 0x1100092 bpf pflogd 77218 365313 1 0 3 0x80 sbwait pflogd 82359 192881 24044 73 3 0x1100090 kqread syslogd 24044 425819 1 0 3 0x100082 sbwait syslogd 76711 491104 1 0 3 0x100080 kqread resolvd 41756 510876 54266 77 3 0x100092 kqread dhcpleased 34757 20134 54266 77 3 0x100092 kqread dhcpleased 54266 383444 1 0 3 0x80 kqread dhcpleased 28824 60331 0 0 3 0x14200 bored smr 87732 326753 0 0 2 0x14200 zerothread 78573 508789 0 0 3 0x14200 aiodoned aiodoned 41252 293582 0 0 3 0x14200 syncer update 9263 359129 0 0 3 0x14200 cleaner cleaner 60430 166305 0 0 3 0x14200 reaper reaper 69975 268693 0 0 3 0x14200 pgdaemon pagedaemon 30941 68260 0 0 3 0x14200 bored viomb 37988 106254 0 0 3 0x40014200 acpi0 acpi0 41126 513552 0 0 3 0x40014200 idle1 95217 251600 0 0 3 0x14200 bored softnet7 9146 297298 0 0 3 0x14200 bored softnet6 18176 469586 0 0 3 0x14200 bored softnet5 51151 14230 0 0 3 0x14200 bored softnet4 20442 400061 0 0 3 0x14200 bored softnet3 68156 335991 0 0 3 0x14200 bored softnet2 91918 494061 0 0 3 0x14200 bored softnet1 47868 346800 0 0 3 0x14200 bored softnet0 539 186159 0 0 3 0x14200 bored systqmp 67191 303222 0 0 3 0x14200 bored systq 80942 519234 0 0 3 0x14200 tmoslp softclockmp 97880 30683 0 0 2 0x40014200 softclock 57719 375629 0 0 3 0x40014200 idle0 1 363926 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &map->flags_lock r = 0 (0xfffffd806b9dc748) #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_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 vm_map_lock_ln+0x66 sys/uvm/uvm_map.c:5155 #4 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3064 #5 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #7 Xsyscall+0x128 Process 31122 (syz-executor) thread 0xffff80003c03c028 (508062) exclusive rwlock dtlk r = 0 (0xffffffff83770e28) #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 dt_ioctl_record_stop+0x2e sys/dev/dt/dt_dev.c:565 #3 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #3 dtclose+0x109 sys/dev/dt/dt_dev.c:232 #4 spec_close+0x466 sys/kern/spec_vnops.c:-1 #5 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #6 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #6 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #7 fdrop+0x121 sys/kern/kern_descrip.c:1267 #8 closef+0x192 sys/kern/kern_descrip.c:1251 #9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff838b0db0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1267 #3 closef+0x192 sys/kern/kern_descrip.c:1251 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #5 Xsyscall+0x128 Process 77538 (syz-executor) thread 0xffff80003c03e2c8 (201545) exclusive rrwlock inode r = 0 (0xfffffd80666676a8) #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+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10217 11190K 11290K 166960K 11449 0 pcb 21 13K 13K 166960K 58 0 rtable 203 6K 7K 166960K 304 0 pf 34 17K 18K 166960K 51 0 ifaddr 44 7K 7K 166960K 49 0 ifgroup 55 2K 2K 166960K 59 0 sysctl 3 1K 9K 166960K 7 0 counters 68 36K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1534 0 iov 1 12K 16K 166960K 5 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1350 85K 85K 166960K 1465 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 5 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 241 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 164K 166960K 543 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 2 0K 0K 166960K 17 0 in_multi 99 7K 7K 166960K 105 0 ether_multi 1 0K 0K 166960K 2 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 412 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 264 168K 182K 166960K 3931 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 43 86K 101K 166960K 1349 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 6 0 NDP 12 0K 2K 166960K 30 0 temp 76 8644K 8712K 166960K 7435 0 kqueue 15 22K 30K 166960K 44 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 49 0 41 1 0 1 1 0 8 0 rtentry 176 105 0 16 5 0 5 5 0 8 0 unpcb 144 216 0 195 2 0 2 2 0 8 1 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 90 0 85 7 0 7 7 0 8 6 arp 128 12 0 1 1 0 1 1 0 8 0 inpcb 328 290 0 275 10 1 9 10 0 8 7 nd6 144 18 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 2 1 1 2 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 3 0 3 1 0 1 1 0 8 1 pffrent 40 1 0 1 1 0 1 1 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 27 0 0 1 0 1 1 0 8 0 pfstkey 128 27 0 0 1 0 1 1 0 8 0 pfstate 384 27 0 0 3 0 3 3 0 8 0 pfrule 1344 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 479 0 44 30 0 30 30 0 8 1 art_table 40 480 0 44 5 0 5 5 0 8 0 art_node 32 104 0 27 1 0 1 1 0 8 0 semapl 112 3 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 1767 0 254 95 0 95 95 0 8 0 ffsino 296 1767 0 254 117 0 117 117 0 8 0 nchpl 144 2107 0 413 64 0 64 64 0 8 0 uvmvnodes 80 1911 0 0 39 0 39 39 0 8 0 vnodes 216 1911 0 0 107 0 107 107 0 8 0 namei 1024 6706 0 6706 2 0 2 2 0 8 2 percpumem 16 52 0 3 1 0 1 1 0 8 0 kstatmem 264 30 0 4 2 0 2 2 0 8 0 scxspl 216 10426 0 10426 9 1 8 8 1 8 8 plimitpl 152 47 0 28 1 0 1 1 0 8 0 sigapl 424 553 0 498 7 0 7 7 0 8 0 knotepl 120 304 0 0 10 0 10 10 0 8 0 kqueuepl 224 51 0 39 2 0 2 2 0 8 1 pipepl 344 113 0 85 3 0 3 3 0 8 0 fdescpl 528 530 0 498 3 0 3 3 0 8 0 filepl 160 2424 0 2174 14 0 14 14 0 8 2 lockfpl 104 91 0 86 1 0 1 1 0 8 0 lockfspl 48 26 0 21 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 279 0 266 1 0 1 1 0 8 0 zombiepl 144 499 0 498 1 0 1 1 0 8 0 processpl 1248 553 0 498 5 0 5 5 0 8 0 procpl 664 766 0 694 7 0 7 7 0 8 0 sockpl 752 559 0 515 14 3 11 14 0 8 6 mcl64k 65536 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 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 160 0 0 10 0 10 10 0 8 0 bufpl 280 4508 0 123 314 0 314 314 0 8 0 anonpl 32 8711 0 0 72 1 71 71 0 246 0 amapchunkpl 152 11834 0 11272 36 3 33 33 0 158 8 amappl16 200 2443 0 2336 18 2 16 16 0 8 4 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 116 0 104 1 0 1 1 0 8 0 amappl13 176 9 0 9 1 1 0 1 0 8 0 amappl12 168 1214 0 1182 3 1 2 2 0 8 0 amappl11 160 80 0 66 1 0 1 1 0 8 0 amappl10 152 49 0 49 1 1 0 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 18 0 16 1 0 1 1 0 8 0 amappl7 128 112 0 99 1 0 1 1 0 8 0 amappl6 120 203 0 199 1 0 1 1 0 8 0 amappl5 112 125 0 116 1 0 1 1 0 8 0 amappl4 104 308 0 289 1 0 1 1 0 8 0 amappl3 96 2048 0 1923 5 1 4 4 0 8 0 amappl2 88 647 0 584 2 0 2 2 0 8 0 amappl1 80 8702 0 8097 14 0 14 14 0 8 0 amappl 88 3226 0 3035 5 0 5 5 0 92 0 dma16384 16384 1 0 1 1 0 1 1 0 8 1 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 24 530 0 498 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 530 0 498 1 0 1 1 0 8 0 vmmpekpl 168 5972 0 5938 2 0 2 2 0 8 0 vmmpepl 168 40839 0 38713 101 0 101 101 0 357 0 vmsppl 488 529 0 498 5 0 5 5 0 8 0 rwobjpl 80 16131 0 13181 65 1 64 64 0 8 0 pdppl 4096 1067 0 996 99 26 73 83 0 8 2 pvpl 32 18265 0 0 148 0 148 148 0 265 0 pmappl 256 529 0 498 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 275 0 28 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8380dff0) 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_write_1(3f8,0,6b) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:774 comcnputc(800,6b) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,6b) at comcnputc+0x1ab sys/dev/ic/com.c:1263 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+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff833fd82e) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c4ab2d0) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c4ab2d0) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c4ab2d0) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:482 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001496000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003c03c028) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c03c028) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80003c4ab470, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8380dff0) 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_write_1(3f8,0,6b) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:774 comcnputc(800,6b) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,6b) at comcnputc+0x1ab sys/dev/ic/com.c:1263 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+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff833fd82e) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c4ab2d0) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c4ab2d0) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c4ab2d0) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:482 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001496000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003c03c028) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c03c028) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c4ab480) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8066163b08,81,fffffd80097fb6e8,ffff80003c03c028) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80666a75e8,ffff80003c03c028) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80666a75e8,ffff80003c03c028) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80666a75e8,ffff80003c03c028) at fdrop+0x121 sys/kern/kern_descrip.c:1267 closef(fffffd80666a75e8,ffff80003c03c028) at closef+0x192 sys/kern/kern_descrip.c:1251 syscall(ffff80003c4ab6e0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4ab6e0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5784cb55a70, count: -21 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x75a5d528b4c0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75a5d528b4c0, count: -1