uvm_fault(0xffff800001ae17b0, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at knote_processfork+0x287: movq 0x8(%r15),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND *288151 29157 0 0 0x4000000 0K syz-executor 127752 83893 0 0x2 0 1 syz-executor knote_processfork(ffffffff85d370e0,b8a4) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff8000298e7e40) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff8000298e8048,1,0,ffff8000298e8020,2000000000c0,b,ffff8000298e8290) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb38fb8,ffff8000298e8290,ffff8000298e8200) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff8000298e8290) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000298e8290) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa82fff49fa0, count: 7 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(0xffff800001ae17b0, 0x8, 0, 1) -> e ddb{0}> show kasan kasan: no report recorded this boot ddb{0}> trace knote_processfork(ffffffff85d370e0,b8a4) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff8000298e7e40) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff8000298e8048,1,0,ffff8000298e8020,2000000000c0,b,ffff8000298e8290) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb38fb8,ffff8000298e8290,ffff8000298e8200) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff8000298e8290) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000298e8290) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa82fff49fa0, count: -8 ddb{0}> show registers rdi 0x8 rsi 0x1 rbp 0xffff8000298e7d10 rbx 0xffff800001d1c132 rdx 0 rcx 0xffffffff84f15ff0 cpu_info_full_primary+0x1ff0 rax 0x1 r8 0x8 r9 0x1 r10 0x7e9 r11 0xffff80003bb3c008 r12 0xffff8000298e7bc0 r13 0xffff8000298e7bc0 r14 0xffffffff85d37220 process0+0x140 r15 0 rip 0xffffffff8302db97 knote_processfork+0x287 cs 0x8 rflags 0x10282 __ALIGN_SIZE+0xf282 rsp 0xffff8000298e7b60 ss 0x10 knote_processfork+0x287: movq 0x8(%r15),%r14 ddb{0}> show proc PROC (syz-executor) tid=288151 pid=29157 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003bb38a88,0xffff80003bb38568 process=0xffff800029ac89b8 user=0xffff8000298dd000, vmspace=0xffff800001ae17b0 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 47268 400139 0 0 2 0x14000 0x200 swapper 19697 484951 6413 0 3 0x2 0 clonelk ifconfig 6413 23232 22034 0 3 0x100002 0x88 sigsusp sh 29157 467436 83893 0 2 0 0 syz-executor 29157 369770 83893 0 2 0 0x4000080 syz-executor 29157 356953 83893 0 3 0 0x4000080 fsleep syz-executor *29157 288151 83893 0 7 0 0x4000000 syz-executor 22034 498360 94968 0 3 0x2 0x80 wait syz-executor 90334 76182 1 0 3 0x100003 0x80 ttyin getty 83893 127752 94968 0 7 0x2 0 syz-executor 87194 418084 94968 0 3 0x2 0x80 piperd syz-executor 35096 438601 94968 0 3 0x2 0x80 nanoslp syz-executor 29449 146477 94968 0 3 0x2 0x80 nanoslp syz-executor 49655 293244 94968 0 3 0x2 0x80 piperd syz-executor 94968 438907 1 0 3 0x2 0x80 wait syz-executor 64571 76833 1 0 3 0x10000002 0x88 kqread sshd 27793 337533 89913 74 3 0x1100012 0x80 bpf pflogd 89913 63267 1 0 3 0 0x80 sbwait pflogd 70736 67416 79412 73 3 0x1100010 0x80 kqread syslogd 79412 514584 1 0 3 0x100002 0x80 sbwait syslogd 95675 299220 1 0 3 0x100000 0x80 kqread resolvd 68023 58353 19486 77 3 0x100012 0x80 kqread dhcpleased 84967 219008 19486 77 3 0x100012 0x80 kqread dhcpleased 19486 485627 1 0 3 0 0x80 kqread dhcpleased 79272 469533 0 0 3 0x14000 0x200 bored smr 22952 254363 0 0 3 0x14000 0x200 pgzero zerothread 71032 197566 0 0 3 0x14000 0x200 aiodoned aiodoned 5245 297912 0 0 3 0x14000 0x200 syncer update 18006 139989 0 0 3 0x14000 0x200 cleaner cleaner 97930 206310 0 0 3 0x14000 0x200 reaper reaper 26895 122881 0 0 3 0x14000 0x200 pgdaemon pagedaemon 56579 72639 0 0 3 0x14000 0x200 bored viomb 60565 4213 0 0 3 0x14000 0x40000200 acpi0 acpi0 63407 164700 0 0 3 0x14000 0x40000200 idle1 25381 25442 0 0 3 0x14000 0x200 bored softnet1 11195 270592 0 0 3 0x14000 0x200 bored softnet0 68100 34675 0 0 3 0x14000 0x200 smrbar systqmp 93115 9088 0 0 3 0x14000 0x200 bored systq 86218 67495 0 0 3 0x14000 0x200 tmoslp softclockmp 28401 3812 0 0 3 0x14000 0x40000200 tmoslp softclock 67463 113412 0 0 3 0x14000 0x40000200 idle0 1 100354 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85d371f8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x683 sys/kern/kern_lock.c:487 #2 knote_processfork+0x666 sys/kern/kern_event.c:-1 #3 fork1+0x1225 sys/kern/kern_fork.c:511 #4 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #5 nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 #6 nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 #7 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #8 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 Process 29157 (syz-executor) thread 0xffff80003bb38fb8 (288151) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff85cda380) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 sysctl_vslock+0x72 sys/kern/kern_sysctl.c:197 #2 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff85073238) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320 #2 sysctl_vslock+0x37 sys/kern/kern_sysctl.c:192 #3 sys_sysctl+0x460 sys/kern/kern_sysctl.c:304 #4 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #5 Xsyscall+0x128 exclusive mutex &pr->ps_mtx r = 0 (0xffffffff85d371f8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x683 sys/kern/kern_lock.c:487 #2 knote_processfork+0x666 sys/kern/kern_event.c:-1 #3 fork1+0x1225 sys/kern/kern_fork.c:511 #4 kthread_create+0xa8 sys/kern/kern_kthread.c:61 #5 nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 #6 nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 #7 sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 #8 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 Process 68100 (systqmp) thread 0xffff800045ffe298 (34675) shared rwlock systqmp r = 0 (0xffffffff853f4d38) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x1ba sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11055 12250K 12371K 166960K 12239 0 pcb 17 28K 30K 166960K 40 0 rtable 194 10K 14K 166960K 456 0 pf 33 22K 30K 166960K 69 0 ifaddr 36 10K 12K 166960K 62 0 ifgroup 51 2K 2K 166960K 77 0 sysctl 2 1K 13K 166960K 7 0 counters 68 42K 43K 166960K 82 0 ioctlops 0 0K 4K 166960K 1499 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1298 84K 84K 166960K 1459 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 3 6K 6K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 14 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 97K 166960K 266 0 sigio 0 0K 0K 166960K 1 0 proc 77 144K 177K 166960K 659 0 subproc 72 9K 9K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 4 0 in_multi 77 5K 7K 166960K 133 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 10 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 49 344K 344K 166960K 49 0 exec 0 0K 2K 166960K 429 0 fusefs mount 1 36K 36K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 204 233K 278K 166960K 4154 0 UVM aobj 7 4K 4K 166960K 7 0 pinsyscall 1059 1747K 1753K 166960K 1511 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 7 0 NDP 11 0K 2K 166960K 40 0 temp 34 9162K 9190K 166960K 5052 0 kqueue 12 33K 56K 166960K 46 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 39 0 36 1 0 1 1 0 8 0 rtentry 176 147 0 59 6 0 6 6 0 8 0 unpcb 144 216 0 201 6 0 6 6 0 8 5 syncache 336 4 0 4 2 1 1 1 0 8 1 tcpcb 736 18 0 15 1 0 1 1 0 8 0 arp 136 24 0 10 1 0 1 1 0 8 0 inpcb 328 185 0 178 7 0 7 7 0 8 6 nd6 152 36 0 18 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 0 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 1 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 pfrktable 1344 4 0 4 1 0 1 1 0 8 1 pfanchor 1288 2 0 2 1 0 1 1 0 8 1 pfstitem 24 39 0 0 1 0 1 1 0 8 0 pfstkey 128 41 0 2 2 0 2 2 0 8 0 pfstate 448 40 0 1 5 0 5 5 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 594 0 180 29 0 29 29 0 8 1 art_table 40 595 0 180 5 0 5 5 0 8 0 art_node 32 147 0 56 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semupl 112 2 0 1 1 0 1 1 0 8 0 semapl 72 12 0 0 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 1717 0 239 93 0 93 93 0 8 0 ffsino 296 1717 0 239 114 0 114 114 0 8 0 nchpl 144 2020 0 309 64 0 64 64 0 8 0 vnodes 216 1878 0 0 105 0 105 105 0 8 0 namei 1024 7467 0 7467 3 1 2 2 0 8 2 percpumem 16 57 0 7 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 0 1 1 0 8 1 kstatmem 264 39 0 14 2 0 2 2 0 8 0 scxspl 216 7268 0 7268 4 3 1 2 1 8 1 plimitpl 152 232 0 216 1 0 1 1 0 8 0 sigapl 424 577 0 533 7 0 7 7 0 8 1 knotepl 120 114 0 0 4 0 4 4 0 8 0 kqueuepl 224 47 0 37 1 0 1 1 0 8 0 pipepl 344 150 0 123 3 0 3 3 0 8 0 fdescpl 528 560 0 534 3 0 3 3 0 8 0 filepl 160 2334 0 2124 15 0 15 15 0 8 4 lockfpl 104 40 0 38 1 0 1 1 0 8 0 lockfspl 48 19 0 17 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 45 0 28 1 0 1 1 0 8 0 ucredpl 104 179 0 165 1 0 1 1 0 8 0 zombiepl 144 538 0 533 1 0 1 1 0 8 0 processpl 1232 577 0 533 5 0 5 5 0 8 1 procpl 664 732 0 685 6 0 6 6 0 8 1 sockpl 752 448 0 423 16 5 11 16 0 8 8 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 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mextrefs 64 22 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 195 0 0 13 0 13 13 0 8 0 bufpl 272 2441 0 106 156 0 156 156 0 8 0 anonpl 32 3877 0 0 32 0 32 32 0 222 0 amapchunkpl 152 11636 0 11239 22 0 22 22 0 158 4 amappl16 200 2045 0 2028 5 2 3 5 0 8 1 amappl15 192 9 0 9 3 2 1 1 0 8 1 amappl14 184 471 0 469 1 0 1 1 0 8 0 amappl13 176 139 0 129 1 0 1 1 0 8 0 amappl12 168 842 0 818 2 0 2 2 0 8 0 amappl11 160 7 0 6 2 1 1 1 0 8 0 amappl10 152 75 0 61 1 0 1 1 0 8 0 amappl9 144 289 0 289 1 1 0 1 0 8 0 amappl8 136 131 0 128 1 0 1 1 0 8 0 amappl7 128 153 0 141 1 0 1 1 0 8 0 amappl6 120 208 0 205 1 0 1 1 0 8 0 amappl5 112 101 0 93 1 0 1 1 0 8 0 amappl4 104 329 0 312 1 0 1 1 0 8 0 amappl3 96 2075 0 1996 3 0 3 3 0 8 0 amappl2 88 680 0 614 2 0 2 2 0 8 0 amappl1 80 11544 0 11116 16 1 15 15 0 8 4 amappl 88 3349 0 3214 5 0 5 5 0 92 0 uvmvnodes 80 101 0 0 3 0 3 3 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 560 0 534 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 560 0 534 1 0 1 1 0 8 0 vmmpekpl 168 6784 0 6748 3 0 3 3 0 8 0 vmmpepl 168 46053 0 44606 88 1 87 87 0 357 16 vmsppl 488 559 0 534 5 0 5 5 0 8 1 rwobjpl 80 16838 0 15947 24 0 24 24 0 8 1 pdppl 4096 1128 0 1068 102 34 68 88 0 8 8 pvpl 32 11161 0 0 91 0 91 91 0 265 0 pmappl 256 559 0 534 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 120 437 0 39 13 0 13 13 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace knote_processfork(ffffffff85d370e0,b8a4) at knote_processfork+0x287 sys/kern/kern_event.c:2246 fork1(ffffffff85d36d80,f0,ffffffff830a12e0,0,0,ffff8000298e7e40) at fork1+0x1225 sys/kern/kern_fork.c:511 kthread_create(ffffffff830a12e0,0,0,ffffffff84b844a0) at kthread_create+0xa8 sys/kern/kern_kthread.c:61 nfs_getset_niothreads(1) at nfs_getset_niothreads+0xe7 sys/nfs/nfs_syscalls.c:702 nfs_sysctl(ffff8000298e8048,1,0,ffff8000298e8020,2000000000c0,b,ffff8000298e8290) at nfs_sysctl+0x102 sys/nfs/nfs_vfsops.c:894 sys_sysctl(ffff80003bb38fb8,ffff8000298e8290,ffff8000298e8200) at sys_sysctl+0x54f sys/kern/kern_sysctl.c:309 syscall(ffff8000298e8290) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000298e8290) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa82fff49fa0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 sys/kern/kern_lock.c:173 syscall(ffff800031ed7500) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800031ed7500) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7de46d836530, count: 9 ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85cd9b80) at __mp_lock+0x272 sys/kern/kern_lock.c:173 syscall(ffff800031ed7500) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800031ed7500) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7de46d836530, count: -6 ddb{1}>