*cpu0: uvm_fault(0xfffffd806caec200, 0x0, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x720fb55345e0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c4411e0 rbx 0 rdx 0 rcx 0xffff80003c41e2c0 rax 0x2a r8 0xffff80003c441110 r9 0 r10 0x9a58abf1a97a286 r11 0x7cd08e44b3e0c721 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff831364c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c441160 ss 0 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=257111 pid=48654 tcnt=1 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c41e7f0,0xffffffff838ddc40 process=0xffff80002a3d0e88 user=0xffff80003c43c000, vmspace=0xfffffd806caec3e8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *48654 257111 82123 0 7 0 syz-executor 28007 153281 87730 0 2 0 syz-executor 819 374372 95666 0 2 0 syz-executor 819 480450 95666 0 2 0x4000000 syz-executor 60776 508738 89698 0 3 0x80 nanoslp syz-executor 60776 179881 89698 0 3 0x4000080 rest syz-executor 60776 266626 89698 0 3 0x4000080 fsleep syz-executor 95324 5625 0 0 3 0x14200 acct acct 17172 250150 51207 0 3 0x3000 suspend syz-executor 17172 301257 51207 0 3 0x4081000 inode syz-executor 17172 475118 51207 0 3 0x4081000 inode syz-executor 17172 379108 51207 0 2 0x4081000 syz-executor 70103 254474 97907 0 3 0x82 nanoslp syz-executor 89698 311248 97907 0 3 0x82 nanoslp syz-executor 51207 257047 97907 0 2 0x2 syz-executor 95666 118089 97907 0 3 0x82 nanoslp syz-executor 82123 101284 97907 0 3 0x82 nanoslp syz-executor 67620 91984 97907 0 3 0x82 nanoslp syz-executor 85458 233408 97907 0 2 0x2 syz-executor 87730 400186 97907 0 3 0x82 nanoslp syz-executor 97907 194320 79590 0 2 0x2 syz-executor 79590 379264 64945 0 3 0x10008a sigsusp ksh 64945 335477 61066 0 3 0x98 kqread sshd-session 61066 26872 90234 0 3 0x92 kqread sshd-session 16055 81391 1 0 3 0x100083 ttyin getty 90234 138011 1 0 3 0x88 kqread sshd 32536 495921 95090 74 3 0x1100092 bpf pflogd 95090 363559 1 0 3 0x80 sbwait pflogd 47975 444780 6538 73 3 0x1100090 kqread syslogd 6538 358576 1 0 3 0x100082 sbwait syslogd 63300 496902 1 0 3 0x100080 kqread resolvd 87030 97678 70791 77 3 0x100092 kqread dhcpleased 67155 83181 70791 77 3 0x100092 kqread dhcpleased 70791 300071 1 0 3 0x80 kqread dhcpleased 77392 157239 0 0 3 0x14200 bored smr 10020 168186 0 0 2 0x14200 zerothread 27555 54337 0 0 3 0x14200 aiodoned aiodoned 82053 434959 0 0 3 0x14200 syncer update 82940 175676 0 0 3 0x14200 cleaner cleaner 30932 48335 0 0 3 0x14200 reaper reaper 16629 363532 0 0 3 0x14200 pgdaemon pagedaemon 31894 477324 0 0 3 0x14200 bored viomb 29115 504245 0 0 3 0x40014200 acpi0 acpi0 28121 435128 0 0 3 0x40014200 idle1 97640 233781 0 0 3 0x14200 bored softnet1 70740 258654 0 0 3 0x14200 bored softnet0 59696 157514 0 0 3 0x14200 bored systqmp 8471 125234 0 0 3 0x14200 bored systq 51299 286965 0 0 3 0x14200 tmoslp softclockmp 49709 145141 0 0 3 0x40014200 tmoslp softclock 62218 172483 0 0 3 0x40014200 idle0 1 163644 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c953810) #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 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #3 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2767 #4 uvm_fault_lower_lookup+0x3d6 sys/uvm/uvm_fault.c:-1 #5 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1348 #6 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #8 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #9 recall_trap+0x8 Process 48654 (syz-executor) thread 0xffff80003c41e2c0 (257111) shared rwlock uobjlk r = 0 (0xfffffd806e9c5cb8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1214 #3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1348 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806caec4e8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1902 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c953810) #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 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #3 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2767 #4 uvm_fault_lower_lookup+0x3d6 sys/uvm/uvm_fault.c:-1 #5 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1348 #6 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #7 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #8 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #9 recall_trap+0x8 Process 17172 (syz-executor) thread 0xffff80003a80d4e0 (379108) exclusive rrwlock inode r = 0 (0xfffffd806c8637d0) #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:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10207 11065K 11349K 166960K 11393 0 pcb 19 12K 12K 166960K 45 0 rtable 239 7K 7K 166960K 363 0 pf 34 17K 18K 166960K 57 0 ifaddr 43 7K 7K 166960K 54 0 ifgroup 55 2K 2K 166960K 75 0 sysctl 1 1K 9K 166960K 7 0 counters 70 37K 37K 166960K 86 0 ioctlops 0 0K 4K 166960K 1501 0 iov 0 0K 12K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1344 85K 85K 166960K 1559 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 136K 136K 166960K 39 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 235 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 0 0K 0K 166960K 5 0 in_multi 99 7K 7K 166960K 107 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 385 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 236 179K 193K 166960K 3982 0 UVM aobj 7 2K 2K 166960K 7 0 pinsyscall 42 84K 105K 166960K 1372 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 12 0K 2K 166960K 33 0 temp 37 8666K 8731K 166960K 10760 0 kqueue 15 24K 30K 166960K 47 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 39 0 36 1 0 1 1 0 8 0 rtentry 176 114 0 4 6 0 6 6 0 8 0 unpcb 144 73 0 56 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 60 0 56 4 0 4 4 0 8 3 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 163 0 153 4 0 4 4 0 8 2 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 4 0 4 1 0 1 1 0 8 1 pppxif 1504 2 0 2 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 24 0 0 1 0 1 1 0 8 0 pfstkey 128 24 0 0 1 0 1 1 0 8 0 pfstate 448 24 0 0 3 0 3 3 0 8 0 pfrule 1344 22 0 16 2 0 2 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 496 0 43 31 0 31 31 0 8 1 art_table 40 497 0 43 5 0 5 5 0 8 0 art_node 32 114 0 14 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 1 0 1 1 0 8 1 semapl 112 35 0 32 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1890 0 376 95 0 95 95 0 8 0 ffsino 296 1890 0 376 117 0 117 117 0 8 0 nchpl 144 2220 0 523 64 0 64 64 0 8 0 vnodes 216 2009 0 0 112 0 112 112 0 8 0 namei 1024 6866 0 6866 1 0 1 1 0 8 1 percpumem 16 58 0 8 1 0 1 1 0 8 0 kstatmem 264 36 0 10 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 8717 0 8717 3 1 2 2 1 8 2 plimitpl 152 46 0 28 1 0 1 1 0 8 0 sigapl 424 547 0 499 7 0 7 7 0 8 1 knotepl 120 320 0 0 10 0 10 10 0 8 0 kqueuepl 224 63 0 52 2 0 2 2 0 8 1 pipepl 344 127 0 99 3 0 3 3 0 8 0 fdescpl 528 530 0 499 3 0 3 3 0 8 0 filepl 160 2504 0 2282 17 0 17 17 0 8 6 lockfpl 104 67 0 65 1 0 1 1 0 8 0 lockfspl 48 27 0 25 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 565 0 552 1 0 1 1 0 8 0 zombiepl 144 502 0 499 1 0 1 1 0 8 0 processpl 1232 547 0 499 5 0 5 5 0 8 1 procpl 664 709 0 655 6 0 6 6 0 8 0 sockpl 752 281 0 251 7 0 7 7 0 8 3 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 154 0 0 10 0 10 10 0 8 0 bufpl 280 3529 0 129 243 0 243 243 0 8 0 anonpl 32 6086 0 0 50 0 50 50 0 246 0 amapchunkpl 152 11485 0 11034 23 0 23 23 0 158 2 amappl16 200 2457 0 2254 11 0 11 11 0 8 0 amappl15 192 17 0 17 1 1 0 1 0 8 0 amappl14 184 19 0 18 1 0 1 1 0 8 0 amappl13 176 427 0 426 1 0 1 1 0 8 0 amappl12 168 905 0 864 3 0 3 3 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 68 0 54 1 0 1 1 0 8 0 amappl9 144 352 0 352 1 1 0 1 0 8 0 amappl8 136 28 0 26 1 0 1 1 0 8 0 amappl7 128 154 0 153 1 0 1 1 0 8 0 amappl6 120 283 0 270 1 0 1 1 0 8 0 amappl5 112 86 0 75 1 0 1 1 0 8 0 amappl4 104 466 0 435 1 0 1 1 0 8 0 amappl3 96 1862 0 1780 4 1 3 3 0 8 0 amappl2 88 653 0 578 3 0 3 3 0 8 1 amappl1 80 10036 0 9445 16 0 16 16 0 8 0 amappl 88 3227 0 3071 5 0 5 5 0 92 0 uvmvnodes 80 102 0 0 3 0 3 3 0 8 0 dma32768 32768 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 128 254 0 254 2 1 1 1 0 8 1 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 530 0 499 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 530 0 499 1 0 1 1 0 8 0 vmmpekpl 168 6250 0 6205 3 0 3 3 0 8 0 vmmpepl 168 42948 0 40883 101 0 101 101 0 357 0 vmsppl 488 529 0 499 5 0 5 5 0 8 1 rwobjpl 80 15554 0 14362 27 0 27 27 0 8 0 pdppl 4096 1068 0 998 96 22 74 84 0 8 4 pvpl 32 12008 0 0 97 0 97 97 0 265 0 pmappl 256 529 0 499 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 274 0 24 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837eaff0) 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(3f8,0,20) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:790 comcnputc(800,20) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,20) at comcnputc+0x1ab sys/dev/ic/com.c:1263 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(65) at db_putchar+0x126 sys/ddb/db_output.c:153 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 db_printf(ffffffff8334d288) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83414e8f) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff800039ffd6d0,0) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff800039ffd6d0) at kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148e000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 end trace frame: 0xffff800039ffd800, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837eaff0) 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(3f8,0,20) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:790 comcnputc(800,20) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,20) at comcnputc+0x1ab sys/dev/ic/com.c:1263 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(65) at db_putchar+0x126 sys/ddb/db_output.c:153 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 db_printf(ffffffff8334d288) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83414e8f) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff800039ffd6d0,0) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff800039ffd6d0) at kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148e000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003c41e028) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c41e028) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff800039ffd880) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f5fee90,81,fffffd80097fd478,ffff80003c41e028) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c236a60,ffff80003c41e028) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c236a60,ffff80003c41e028) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c236a60,ffff80003c41e028) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c236a60,ffff80003c41e028) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c41e028) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c41e028,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c41e028,ffff800039ffdbf0,ffff800039ffdb40) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039ffdbf0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039ffdbf0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x76292d4ced60, count: -25 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: 0x720fb55345e0, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x720fb55345e0, count: -1