*cpu0: uvm_fault(0xfffff6006cf173e8, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7855c8b75aa0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c3fabd0 rbx 0 rdx 0 rcx 0xffff80003abb0fb8 rax 0x2a r8 0xffff80003c3fab00 r9 0 r10 0xd72dd9cabe9bdb08 r11 0x1727b2e98ae98c39 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff816804c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c3fab50 ss 0 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=264678 pid=82350 tcnt=4 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=0xffff80003abb0d20,0xffff800045fe8030 process=0xffff800045fe79e0 user=0xffff80003c3f5000, vmspace=0xfffff6006cf173e8 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND *82350 264678 14996 0 7 0 0 syz-executor 82350 401244 14996 0 2 0 0x4000000 syz-executor 82350 89817 14996 0 2 0 0x4000000 syz-executor 82350 29385 14996 0 7 0 0x4000000 syz-executor 56928 137407 14605 0 2 0x10 0 syz-executor 56928 9815 14605 0 3 0x10 0x4000080 fsleep syz-executor 31139 12281 75753 0 2 0 0 syz-executor 31139 251078 75753 0 3 0 0x4000088 kqpoll syz-executor 31139 447002 75753 0 2 0 0x4000000 syz-executor 6315 315457 62231 0 2 0 0 syz-executor 6315 429016 62231 0 3 0 0x4000080 fsleep syz-executor 6315 169575 62231 0 3 0 0x4000080 fsleep syz-executor 34023 56791 32666 0 2 0 0 syz-executor 34023 48916 32666 0 3 0 0x4000000 smrbar syz-executor 34023 241280 32666 0 3 0 0x4000080 fsleep syz-executor 30213 141242 43263 0 3 0 0x80 nanoslp syz-executor 30213 116564 43263 0 3 0 0x4000080 kqread syz-executor 30213 254238 43263 0 3 0 0x4000080 kqread syz-executor 30213 79037 43263 0 3 0 0x4000080 fsleep syz-executor 19030 165406 15945 0 2 0 0 syz-executor 19030 451509 15945 0 3 0 0x4000080 fsleep syz-executor 6969 346940 48347 0 3 0 0x80 nanoslp syz-executor 6969 215340 48347 0 3 0 0x4000080 ttyin syz-executor 6969 348828 48347 0 3 0 0x4000080 fsleep syz-executor 15945 227896 82434 0 3 0x2 0x80 nanoslp syz-executor 32666 353375 82434 0 3 0x2 0x80 nanoslp syz-executor 48347 353131 82434 0 3 0x2 0x80 nanoslp syz-executor 62231 109035 82434 0 3 0x2 0x80 nanoslp syz-executor 43263 406393 82434 0 3 0x2 0x80 nanoslp syz-executor 75753 508604 82434 0 3 0x2 0x80 nanoslp syz-executor 14996 362547 82434 0 3 0x2 0x80 nanoslp syz-executor 14605 67457 82434 0 3 0x2 0x80 nanoslp syz-executor 82434 194689 88542 0 3 0x2 0x80 kqread syz-executor 88542 396720 2247 0 3 0x100002 0x88 sigsusp ksh 2247 313425 66276 0 3 0x10 0x88 kqread sshd-session 66276 266606 29992 0 3 0x12 0x80 kqread sshd-session 40432 13458 1 0 3 0x100003 0x80 ttyin getty 29992 153023 1 0 3 0 0x88 kqread sshd 18530 353667 2401 74 3 0x1100012 0x80 bpf pflogd 2401 253156 1 0 3 0 0x80 sbwait pflogd 73111 351210 16461 73 3 0x1100010 0x80 kqread syslogd 16461 355375 1 0 3 0x100002 0x80 sbwait syslogd 448 169695 1 0 3 0x100000 0x80 kqread resolvd 31836 487509 2808 77 3 0x100012 0x80 kqread dhcpleased 66583 63432 2808 77 3 0x100012 0x80 kqread dhcpleased 2808 153056 1 0 3 0 0x80 kqread dhcpleased 91935 486244 0 0 2 0x14000 0x40000200 smr 37461 509286 0 0 2 0x14000 0x200 zerothread 68955 7688 0 0 3 0x14000 0x200 aiodoned aiodoned 91075 336736 0 0 3 0x14000 0x200 syncer update 5394 266319 0 0 3 0x14000 0x200 cleaner cleaner 2166 57706 0 0 3 0x14000 0x200 reaper reaper 6492 397112 0 0 3 0x14000 0x200 pgdaemon pagedaemon 6337 233120 0 0 3 0x14000 0x200 bored viomb 90551 232420 0 0 3 0x14000 0x40000200 acpi0 acpi0 84667 242255 0 0 3 0x14000 0x40000200 idle1 43367 111525 0 0 3 0x14000 0x200 bored softnet1 13598 428930 0 0 3 0x14000 0x200 bored softnet0 15131 403415 0 0 3 0x14000 0x200 smrbar systqmp 20273 373165 0 0 3 0x14000 0x200 bored systq 60826 99622 0 0 3 0x14000 0x200 tmoslp softclockmp 78678 264576 0 0 3 0x14000 0x40000200 tmoslp softclock 66480 473177 0 0 3 0x14000 0x40000200 idle0 1 125224 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffff6000c180010) #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 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline] #2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2777 #3 uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 82350 (syz-executor) thread 0xffff80003abb0fb8 (264678) exclusive rwlock amaplk r = 0 (0xfffff600646a7308) #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 uvm_fault_check+0x8a9 sys/uvm/uvm_fault.c:834 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #5 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #6 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffff6006cf174e8) #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:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 exclusive mutex &pmap->pm_mtx r = 0 (0xfffff6000c180010) #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 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline] #2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2777 #3 uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 82350 (syz-executor) thread 0xffff800045fe8a80 (29385) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a8ed40) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 34023 (syz-executor) thread 0xffff800045fe82b8 (48916) exclusive rwlock clonelk r = 0 (0xffffffff83936948) #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 if_clone_destroy+0x93 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2160 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 15131 (systqmp) thread 0xffff800045ffe000 (403415) shared rwlock systqmp r = 0 (0xffffffff83935388) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11124 12181K 12260K 166960K 12270 0 pcb 17 12K 12K 166960K 27 0 rtable 216 6K 6K 166960K 358 0 pf 32 17K 18K 166960K 45 0 ifaddr 39 6K 7K 166960K 45 0 ifgroup 51 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1487 0 iov 0 0K 12K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1387 87K 87K 166960K 1472 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 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 93K 166960K 161 0 sigio 0 0K 0K 166960K 2 0 proc 71 115K 180K 166960K 553 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 4 0 in_multi 88 5K 6K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 392 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 247 167K 176K 166960K 3426 0 UVM aobj 4 2K 2K 166960K 5 0 pinsyscall 43 86K 104K 166960K 1347 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 24 1K 2K 166960K 28 0 temp 34 9114K 9120K 166960K 4090 0 kqueue 19 27K 27K 166960K 36 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 37 0 33 1 0 1 1 0 8 0 rtentry 176 111 0 12 5 0 5 5 0 8 0 unpcb 144 47 0 30 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 16 0 9 1 0 1 1 0 8 0 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 121 0 111 4 0 4 4 0 8 3 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 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 pfstitem 24 20 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 0 1 0 1 1 0 8 0 pfstate 448 20 0 0 3 0 3 3 0 8 0 pfrule 1360 22 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 44 29 0 29 29 0 8 1 art_table 40 454 0 44 5 0 5 5 0 8 0 art_node 32 111 0 12 1 0 1 1 0 8 0 shmpl 112 2 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1595 0 128 92 0 92 92 0 8 0 ffsino 296 1595 0 128 114 0 114 114 0 8 1 nchpl 144 1817 0 118 64 0 64 64 0 8 0 vnodes 216 1791 0 0 100 0 100 100 0 8 0 namei 1024 5727 0 5727 2 0 2 2 0 8 2 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 27 0 2 2 0 2 2 0 8 0 scxspl 216 6371 0 6371 4 2 2 3 1 8 2 plimitpl 152 31 0 14 1 0 1 1 0 8 0 sigapl 424 487 0 439 7 0 7 7 0 8 1 knotepl 120 500 0 0 16 0 16 16 0 8 0 kqueuepl 224 31 0 17 1 0 1 1 0 8 0 pipepl 344 130 0 103 3 0 3 3 0 8 0 fdescpl 528 471 0 439 3 0 3 3 0 8 0 filepl 160 1828 0 1537 15 0 15 15 0 8 2 lockfpl 104 17 0 15 1 0 1 1 0 8 0 lockfspl 48 9 0 7 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 118 0 104 1 0 1 1 0 8 0 zombiepl 144 439 0 439 1 0 1 1 0 8 1 processpl 1232 487 0 439 5 0 5 5 0 8 0 procpl 664 545 0 481 6 0 6 6 0 8 0 sockpl 752 205 0 174 7 0 7 7 0 8 3 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl16k 16384 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 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 15 0 0 2 0 2 2 0 8 0 mextrefs 64 16 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 124 0 0 8 0 8 8 0 8 0 bufpl 272 2381 0 106 152 0 152 152 0 8 0 anonpl 32 5772 0 0 47 0 47 47 0 247 0 amapchunkpl 152 9208 0 8679 26 0 26 26 0 158 5 amappl16 200 1222 0 1198 4 0 4 4 0 8 2 amappl15 192 12 0 12 2 1 1 1 0 8 1 amappl14 184 437 0 436 1 0 1 1 0 8 0 amappl13 176 124 0 112 1 0 1 1 0 8 0 amappl12 168 735 0 704 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 0 1 1 0 8 1 amappl10 152 68 0 54 1 0 1 1 0 8 0 amappl9 144 298 0 298 1 0 1 1 0 8 1 amappl8 136 100 0 98 1 0 1 1 0 8 0 amappl7 128 150 0 136 1 0 1 1 0 8 0 amappl6 120 157 0 155 1 0 1 1 0 8 0 amappl5 112 128 0 118 1 0 1 1 0 8 0 amappl4 104 312 0 292 1 0 1 1 0 8 0 amappl3 96 1608 0 1503 3 0 3 3 0 8 0 amappl2 88 606 0 528 2 0 2 2 0 8 0 amappl1 80 10608 0 10009 15 0 15 15 0 8 2 amappl 88 2674 0 2501 4 0 4 4 0 92 0 uvmvnodes 80 98 0 0 2 0 2 2 0 8 0 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 4 0 1 1 0 1 1 0 8 0 uaddrrnd 24 471 0 439 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 471 0 439 1 0 1 1 0 8 0 vmmpekpl 168 5925 0 5891 2 0 2 2 0 8 0 vmmpepl 168 39199 0 37239 87 0 87 87 0 357 1 vmsppl 488 470 0 439 5 0 5 5 0 8 1 rwobjpl 80 14379 0 13346 24 0 24 24 0 8 0 pdppl 4096 949 0 878 101 18 83 85 0 8 12 pvpl 32 13687 0 0 111 0 111 111 0 265 0 pmappl 256 470 0 439 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 421 0 20 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83967ff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,20) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,20) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(2d) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(2d) at db_putchar+0x126 sys/ddb/db_output.c:153 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff83460681) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff8351d362) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80003c4187d0,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80003c4187d0) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800045fe8a80,fffff60060f652c8,ffff80003c4189b0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 end trace frame: 0xffff80003c418a20, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83967ff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670 comcnputc(800,20) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,20) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(2d) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(2d) at db_putchar+0x126 sys/ddb/db_output.c:153 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff83460681) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff8351d362) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80003c4187d0,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80003c4187d0) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800045fe8a80,fffff60060f652c8,ffff80003c4189b0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff800045fe8a80,ffff80003c418b00,ffff80003c418a50) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 syscall(ffff80003c418b00) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c418b00) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4138487da10, count: -17 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: 0x7855c8b75aa0, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x7855c8b75aa0, count: -1