uvm_fault(0xfffffd806c16c018, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81616750 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff8000363dbf80 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81616750 Starting stack trace... panic(ffffffff8333c07c) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff8000363dbed0) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000016e6000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:580 dtclose(31e5f,81,2000,ffff80003b7fd750) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(31e5f,81,2000,ffff80003b7fd750) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff8000363dc080) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806bce3878,81,fffffd80097fb4e0,ffff80003b7fd750) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bd9f370,ffff80003b7fd750) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bd9f370,ffff80003b7fd750) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bd9f370,ffff80003b7fd750) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806bd9f370,ffff80003b7fd750) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003b7fd750) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003b7fd750,0,0,1) at exit1+0x5a0 sys/kern/kern_exit.c:215 sys_exit(ffff80003b7fd750,ffff8000363dc3f0,ffff8000363dc340) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000363dc3f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000363dc3f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721fdfbc11a0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 430985 89034 0 0x102004 0 0 sh * 47687 36362 0 0 0 1 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7f3aa0c545f0, 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}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806c16c018, 0x0, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7f3aa0c545f0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2a09b0 rbx 0 rdx 0 rcx 0xffff80003b7fdc70 rax 0x2a r8 0xffff80002a2a08e0 r9 0x1 r10 0x21fcf4e639282d92 r11 0x60e5b9ad89823c01 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff82f934c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80002a2a0930 ss 0 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=47687 pid=36362 tcnt=4 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b7fc040,0xffff80003b7fc800 process=0xffff80003c4b8500 user=0xffff80002a29b000, vmspace=0xfffffd806c16c978 estcpu=36, cpticks=12, pctcpu=0.0, user=10, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 89034 430985 54216 0 7 0x102004 sh 54216 207184 85198 0 3 0x10008a sigsusp sh 26303 447292 0 0 3 0x14200 acct acct 50331 274646 47941 0 3 0x80 nanoslp syz-executor 50331 221420 47941 0 3 0x4000080 kqsel syz-executor 50331 85344 47941 0 3 0x4000080 fsleep syz-executor 50331 413122 47941 0 3 0x4000080 fsleep syz-executor *36362 47687 76039 0 7 0 syz-executor 36362 390234 76039 0 3 0x4000080 fsleep syz-executor 36362 466802 76039 0 3 0x4000080 fsleep syz-executor 36362 308824 76039 0 3 0x4000080 fsleep syz-executor 43871 67763 47009 0 2 0 syz-executor 43871 97944 47009 0 3 0x4000080 ttyout syz-executor 43871 143765 47009 0 2 0x4000000 syz-executor 85198 258739 40830 0 3 0x82 wait syz-executor 76039 73010 40830 0 3 0x82 nanoslp syz-executor 66023 459094 1 0 3 0x100083 ttyin getty 72788 182507 40830 0 3 0x82 nanoslp syz-executor 47941 139590 40830 0 3 0x82 nanoslp syz-executor 56243 181874 0 0 3 0x14200 bored sosplice 85705 125154 40830 0 3 0x82 wait syz-executor 47009 253737 40830 0 3 0x82 nanoslp syz-executor 40331 175107 40830 0 3 0x82 wait syz-executor 80502 486709 40830 0 3 0x82 wait syz-executor 40830 86902 9869 0 3 0x82 kqread syz-executor 9869 191212 16908 0 3 0x10008a sigsusp ksh 16908 228634 8253 0 3 0x98 kqread sshd-session 8253 436577 29485 0 3 0x92 kqread sshd-session 29485 118107 1 0 3 0x88 kqread sshd 60369 298574 49541 74 3 0x1100092 bpf pflogd 49541 20151 1 0 3 0x80 sbwait pflogd 73723 8168 73391 73 3 0x1100090 kqread syslogd 73391 394428 1 0 3 0x100082 sbwait syslogd 48826 399924 1 0 3 0x100080 kqread resolvd 11134 505539 5459 77 3 0x100092 kqread dhcpleased 42460 254235 5459 77 3 0x100092 kqread dhcpleased 5459 241077 1 0 3 0x80 kqread dhcpleased 8241 436303 0 0 3 0x14200 bored smr 2885 318659 0 0 3 0x14200 pgzero zerothread 98984 231558 0 0 3 0x14200 aiodoned aiodoned 84907 290921 0 0 3 0x14200 syncer update 5670 298841 0 0 3 0x14200 cleaner cleaner 18182 427979 0 0 3 0x14200 reaper reaper 54642 114138 0 0 3 0x14200 pgdaemon pagedaemon 86590 462578 0 0 3 0x14200 bored viomb 9397 59082 0 0 3 0x40014200 acpi0 acpi0 47446 501194 0 0 3 0x40014200 idle1 74304 73263 0 0 3 0x14200 bored softnet3 69083 483077 0 0 3 0x14200 bored softnet2 76717 202250 0 0 3 0x14200 bored softnet1 95064 468644 0 0 3 0x14200 netlock softnet0 2371 303475 0 0 2 0x40014200 systqmp 86780 235306 0 0 3 0x14200 bored systq 81864 77311 0 0 3 0x14200 tmoslp softclockmp 64817 285479 0 0 3 0x40014200 tmoslp softclock 20005 463353 0 0 3 0x40014200 idle0 1 429134 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 43871 (syz-executor) thread 0xffff80003b7fc040 (143765) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10251 11105K 12487K 166960K 18576 0 pcb 17 16K 18K 166960K 790 0 rtable 200 16K 17K 166960K 899 0 pf 37 18K 20K 166960K 304 0 ifaddr 36 6K 8K 166960K 195 0 ifgroup 55 2K 3K 166960K 370 0 sysctl 4 1K 9K 166960K 19 0 counters 68 36K 38K 166960K 384 0 ioctlops 0 0K 4K 166960K 2380 0 iov 0 0K 28K 166960K 171 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1515 95K 96K 166960K 5159 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 54 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 130 0 dirhash 15 2K 3K 166960K 69 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 252K 166960K 3710 0 sigio 0 0K 0K 166960K 94 0 proc 73 91K 140K 166960K 1041 0 subproc 72 4K 4K 166960K 118 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 395 0 in_multi 59 4K 7K 166960K 240 0 ether_multi 1 0K 0K 166960K 31 0 mrt 1 0K 0K 166960K 19 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 1 0K 1K 166960K 946 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 2K 166960K 9 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 273 162K 191K 166960K 35597 0 UVM aobj 106 3K 3K 166960K 115 0 pinsyscall 45 90K 100K 166960K 4969 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 239 0 NDP 12 0K 2K 166960K 143 0 temp 82 8688K 8816K 166960K 172466 0 kqueue 17 21K 30K 166960K 674 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 120 546 0 543 6 5 1 3 0 8 0 rtentry 176 233 0 159 6 0 6 6 0 8 0 unpcb 144 2251 0 2232 19 17 2 6 0 8 1 syncache 336 18 0 18 2 2 0 1 0 8 0 tcpqe 32 13 0 13 3 3 0 1 0 8 0 tcpcb 808 1320 0 1312 25 23 2 11 0 8 1 arp 128 39 0 22 1 0 1 1 0 8 0 inpcb 384 4062 0 4049 37 29 8 15 0 8 6 nd6 144 45 0 29 1 0 1 1 0 8 0 pkpcb 40 35 0 35 4 3 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 120 0 120 1 0 1 1 0 8 1 pppxif 1504 18 0 18 4 4 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 53 0 46 1 0 1 1 0 482 0 pffrnode 88 52 0 45 1 0 1 1 0 8 0 pffrent 40 109 0 102 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 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 245 0 118 1 0 1 1 0 8 0 pfstkey 128 247 0 120 5 0 5 5 0 8 0 pfstate 384 246 0 119 13 0 13 13 0 8 0 pfrule 1344 32 0 24 2 1 1 2 0 8 0 rttmr 136 3 0 3 3 3 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 871 0 592 29 5 24 29 0 8 0 art_table 32 875 0 592 4 0 4 4 0 8 0 art_node 16 218 0 157 1 0 1 1 0 8 0 sysvmsgpl 40 19 0 16 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 122 0 112 1 0 1 1 0 8 0 shmpl 112 112 0 9 3 0 3 3 0 8 0 dirhash 1024 55 0 36 3 0 3 3 0 8 0 dino2pl 256 8135 0 6621 96 0 96 96 0 8 0 ffsino 288 8135 0 6621 109 0 109 109 0 8 0 nchpl 144 13215 0 11507 64 0 64 64 0 8 0 rtmask 32 15 0 15 5 5 0 1 0 8 0 uvmvnodes 80 5180 0 0 106 0 106 106 0 8 0 vnodes 216 5180 0 0 288 0 288 288 0 8 0 namei 1024 48204 0 48203 3 2 1 2 0 8 0 percpumem 16 207 0 158 1 0 1 1 0 8 0 kstatmem 264 238 0 210 3 0 3 3 0 8 1 scsiplug 72 19 0 19 5 5 0 1 0 8 0 scxspl 216 39879 0 39879 14 13 1 8 1 8 1 plimitpl 152 777 0 758 1 0 1 1 0 8 0 sigapl 424 3997 0 3944 11 4 7 9 0 8 0 knotepl 120 586 0 0 17 0 17 17 0 8 0 kqueuepl 224 1526 0 1510 16 14 2 5 0 8 1 pipepl 336 700 0 673 16 10 6 8 0 8 3 fdescpl 520 3945 0 3912 3 0 3 3 0 8 0 filepl 160 28117 0 27876 32 19 13 20 0 8 0 lockfpl 104 1092 0 1090 1 0 1 1 0 8 0 lockfspl 48 442 0 440 1 0 1 1 0 8 0 sessionpl 144 43 0 34 1 0 1 1 0 8 0 pgrppl 48 191 0 174 1 0 1 1 0 8 0 ucredpl 104 4342 0 4329 1 0 1 1 0 8 0 zombiepl 144 5188 0 5184 1 0 1 1 0 8 0 processpl 1240 3997 0 3944 6 0 6 6 0 8 0 procpl 656 10185 0 10124 11 5 6 8 0 8 0 srpgc 96 10 0 10 4 3 1 1 0 8 1 sosppl 168 23 0 23 6 5 1 1 0 8 1 sockpl 728 6969 0 6934 59 50 9 19 0 8 5 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 92 0 0 12 0 12 12 0 8 0 mtagpl 96 278 0 0 7 0 7 7 0 8 0 mbufpl 256 2458 0 0 151 0 151 151 0 8 0 bufpl 280 10439 0 4297 440 0 440 440 0 8 0 anonpl 32 10711 0 0 86 0 86 86 0 246 0 amapchunkpl 152 122854 0 122136 56 23 33 36 0 158 5 amappl16 200 7178 0 7044 53 38 15 18 0 8 6 amappl15 192 3 0 3 2 2 0 1 0 8 0 amappl14 184 155 0 142 1 0 1 1 0 8 0 amappl13 176 6 0 6 4 4 0 1 0 8 0 amappl12 168 4694 0 4659 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 270 0 269 1 0 1 1 0 8 0 amappl8 136 21 0 17 1 0 1 1 0 8 0 amappl7 128 207 0 194 1 0 1 1 0 8 0 amappl6 120 236 0 230 1 0 1 1 0 8 0 amappl5 112 150 0 140 1 0 1 1 0 8 0 amappl4 104 409 0 388 1 0 1 1 0 8 0 amappl3 96 25393 0 25267 5 1 4 4 0 8 0 amappl2 88 855 0 789 2 0 2 2 0 8 0 amappl1 80 26257 0 25653 16 1 15 15 0 8 0 amappl 88 34083 0 33883 5 0 5 5 0 92 0 dma8192 8192 2 0 2 2 1 1 1 0 8 1 dma4096 4096 3 0 3 3 3 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 260 0 260 6 6 0 1 0 8 0 dma64 64 8 0 8 3 3 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 114 0 9 2 0 2 2 0 8 0 uaddrrnd 24 3945 0 3912 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3945 0 3912 1 0 1 1 0 8 0 vmmpekpl 168 31605 0 31546 4 0 4 4 0 8 0 vmmpepl 168 247953 0 245736 122 18 104 104 0 357 3 vmsppl 480 3944 0 3912 5 0 5 5 0 8 0 rwobjpl 72 64105 0 57729 123 4 119 119 0 8 1 pdppl 4096 7897 0 7824 125 52 73 81 0 8 0 pvpl 32 18520 0 0 151 2 149 149 0 265 0 pmappl 256 3944 0 3912 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 607 0 101 15 0 15 15 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838aeff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff839f1a80) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:128 [inline] __mp_lock(ffffffff839f1a80) at __mp_lock+0x1a3 sys/kern/kern_lock.c:159 softintr_dispatch(2) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:840 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff839f1a80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:128 [inline] __mp_lock(ffffffff839f1a80) at __mp_lock+0x192 sys/kern/kern_lock.c:159 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:840 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839f1a80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:128 [inline] __mp_lock(ffffffff839f1a80) at __mp_lock+0x192 sys/kern/kern_lock.c:159 __mp_acquire_count(ffffffff839f1a80,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 end trace frame: 0xffff80003c4d09a0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff838aeff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff839f1a80) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:128 [inline] __mp_lock(ffffffff839f1a80) at __mp_lock+0x1a3 sys/kern/kern_lock.c:159 softintr_dispatch(2) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:840 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff839f1a80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:128 [inline] __mp_lock(ffffffff839f1a80) at __mp_lock+0x192 sys/kern/kern_lock.c:159 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:840 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839f1a80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:128 [inline] __mp_lock(ffffffff839f1a80) at __mp_lock+0x192 sys/kern/kern_lock.c:159 __mp_acquire_count(ffffffff839f1a80,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 yield() at yield+0x6a sys/kern/sched_bsd.c:320 pool_get(ffffffff83971b58,1) at pool_get+0x265 sys/kern/subr_pool.c:588 uvm_mapent_alloc(ffff800000025000,1323) at uvm_mapent_alloc+0x35a sys/uvm/uvm_map.c:-1 uvm_map(ffff800000025000,ffff80003c4d0c20,80000,ffffffff83901b38,ffffffffffffffff,0,943eeddb9bbd6afd) at uvm_map+0x3b7 sys/uvm/uvm_map.c:-1 km_alloc(80000,ffffffff835d6780,ffffffff834af2a0,ffffffff834af2f0) at km_alloc+0x20d sys/uvm/uvm_km.c:746 sys_execve(ffff8000ffffca48,ffff80003c4d12b0,ffff80003c4d1200) at sys_execve+0x1fc sys/kern/kern_exec.c:-1 syscall(ffff80003c4d12b0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4d12b0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e7ba4e5a460, count: -23 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7f3aa0c545f0, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7f3aa0c545f0, count: -1