uvm_fault(0xfffffd8008a121d0, 0x8, 0, 1) -> e kernel: page fault trap, code=0 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND 291317 39361 0 0x2000002 0x4000001 1 syz-fuzzer witness_checkorder(fffffd807e8b30e8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd807e8b30d8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002120d800,fffffd807e8b30d8,fffffd807e8b3160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002120d800,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002120d800) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002120d800,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002120d800,ffff800022d00f70,ffff800022d00fc0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800022d01040) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022d01040) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75a4f544c7c0, count: 6 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(0xfffffd8008a121d0, 0x8, 0, 1) -> e ddb{0}> trace witness_checkorder(fffffd807e8b30e8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd807e8b30d8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002120d800,fffffd807e8b30d8,fffffd807e8b3160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002120d800,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002120d800) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002120d800,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002120d800,ffff800022d00f70,ffff800022d00fc0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800022d01040) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022d01040) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75a4f544c7c0, count: -9 ddb{0}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff800022d00d10 rbx 0xe rdx 0 rcx 0xffff80002120d800 rax 0xffffffff82bd4ff0 cpu_info_full_primary+0x1ff0 r8 0x1 r9 0 r10 0xf8dd9d5234697096 r11 0x5d30d601f373fbaf r12 0 r13 0xfffffd807e8b30e8 r14 0 r15 0xffff80002120d800 rip 0xffffffff8138576c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800022d00c60 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{0}> show proc PROC (syz-executor.0) pid=132379 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff80002120d008,0xffff8000212252b0 process=0xffff80002129e5c8 user=0xffff800022cfc000, vmspace=0xfffffd8008a121d0 estcpu=28, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 4925 232066 32682 0 2 0 syz-executor.4 82419 356981 25865 0 2 0x480 syz-executor.2 82419 377392 25865 0 3 0x4000080 netio syz-executor.2 82419 409091 25865 0 3 0x4000080 fsleep syz-executor.2 48754 211517 28524 0 3 0x80 fsleep syz-executor.7 48754 106456 28524 0 3 0x4000080 netio syz-executor.7 48754 289654 28524 0 3 0x4000080 fsleep syz-executor.7 48754 175272 28524 0 3 0x4000080 fsleep syz-executor.7 41911 327 17565 0 3 0x80 fsleep syz-executor.6 41911 84901 17565 0 3 0x4000080 ttyin syz-executor.6 14412 513005 81145 0 3 0x80 fsleep syz-executor.3 14412 86565 81145 0 3 0x4000080 netio syz-executor.3 25865 191249 39361 0 3 0x82 nanoslp syz-executor.2 44610 383479 39361 0 2 0x2 syz-executor.1 4670 185099 39361 0 3 0x82 nanoslp syz-executor.0 65010 472074 1 0 3 0x100083 ttyin getty 47600 356414 0 0 3 0x14280 nfsidl nfsio 58942 521126 0 0 3 0x14280 nfsidl nfsio 52215 304538 0 0 3 0x14280 nfsidl nfsio 85963 191101 0 0 3 0x14280 nfsidl nfsio 30307 332116 0 0 3 0x14280 nfsidl nfsio 75331 252311 0 0 3 0x14280 nfsidl nfsio 14171 99105 0 0 3 0x14280 nfsidl nfsio 38753 150378 0 0 3 0x14280 nfsidl nfsio 96984 404280 0 0 3 0x14280 nfsidl nfsio 18533 470641 0 0 3 0x14280 nfsidl nfsio 28464 320096 0 0 3 0x14280 nfsidl nfsio 79427 336340 0 0 3 0x14280 nfsidl nfsio 67900 19492 0 0 3 0x14280 nfsidl nfsio 71860 123065 0 0 3 0x14280 nfsidl nfsio 57879 89761 0 0 3 0x14280 nfsidl nfsio 40091 4145 0 0 3 0x14280 nfsidl nfsio 70819 25907 0 0 3 0x14280 nfsidl nfsio 89745 512383 0 0 3 0x14280 nfsidl nfsio 40309 162682 0 0 3 0x14280 nfsidl nfsio 89734 363221 0 0 3 0x14280 nfsidl nfsio 99153 307787 0 0 3 0x14200 acct acct 75414 911 0 0 3 0x14200 bored sosplice 28524 3218 39361 0 2 0x482 syz-executor.7 17565 41570 39361 0 3 0x82 nanoslp syz-executor.6 32682 166814 39361 0 3 0x82 nanoslp syz-executor.4 81145 197491 39361 0 2 0x482 syz-executor.3 39361 213918 77283 0 3 0x2000082 wait syz-fuzzer 39361 217560 77283 0 3 0x6000082 nanoslp syz-fuzzer 39361 291317 77283 0 7 0x6000003 syz-fuzzer 39361 518602 77283 0 3 0x6000082 thrsleep syz-fuzzer 39361 498900 77283 0 2 0x6000002 syz-fuzzer 39361 237145 77283 0 3 0x6000082 wait syz-fuzzer 39361 107063 77283 0 3 0x6000082 wait syz-fuzzer 39361 274317 77283 0 3 0x6000082 wait syz-fuzzer 39361 135789 77283 0 3 0x6000082 thrsleep syz-fuzzer 39361 223368 77283 0 3 0x6000082 wait syz-fuzzer 39361 495997 77283 0 3 0x6000082 thrsleep syz-fuzzer 39361 80209 77283 0 3 0x6000082 wait syz-fuzzer 39361 483931 77283 0 3 0x6000082 wait syz-fuzzer 39361 287601 77283 0 3 0x6000082 thrsleep syz-fuzzer 39361 58286 77283 0 3 0x6000082 thrsleep syz-fuzzer 77283 1534 5389 0 3 0x10008a sigsusp ksh 5389 73821 21193 0 3 0x9a kqread sshd 21193 101705 1 0 3 0x88 kqread sshd 68085 273417 84158 74 3 0x1100092 bpf pflogd 84158 262270 1 0 3 0x80 netio pflogd 94157 301144 66232 73 3 0x1100090 kqread syslogd 66232 387099 1 0 3 0x100082 netio syslogd 49983 71915 1 0 3 0x100080 kqread resolvd 14506 461313 61567 77 3 0x100092 kqread dhcpleased 75706 5719 61567 77 3 0x100092 kqread dhcpleased 61567 301515 1 0 3 0x80 kqread dhcpleased 99090 430919 0 0 3 0x14200 bored smr 46351 156129 0 0 2 0x14200 zerothread 64791 456103 0 0 3 0x14200 aiodoned aiodoned 16573 33937 0 0 3 0x14200 syncer update 53804 469614 0 0 3 0x14200 cleaner cleaner 56184 25313 0 0 2 0x14200 reaper 2850 465180 0 0 3 0x14200 pgdaemon pagedaemon 21303 185109 0 0 3 0x14200 bored viomb 46373 403374 0 0 3 0x40014200 acpi0 acpi0 94831 201198 0 0 3 0x40014200 idle1 27921 373852 0 0 3 0x14200 bored softnet3 49536 153766 0 0 3 0x14200 bored softnet2 93630 109993 0 0 3 0x14200 bored softnet1 3550 211774 0 0 3 0x14200 bored softnet0 12685 281084 0 0 3 0x14200 bored systqmp 34351 230767 0 0 3 0x14200 bored systq 39676 349544 0 0 2 0x40014200 softclock 70528 79106 0 0 3 0x40014200 idle0 1 297002 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10223 6542K 7302K 78643K 18196 0 pcb 13 14K 16K 78643K 230 0 rtable 219 6K 7K 78643K 654 0 pf 30 9K 10K 78643K 98 0 ifaddr 41 15K 16K 78643K 88 0 ifgroup 51 2K 2K 78643K 134 0 sysctl 2 0K 0K 78643K 2 0 counters 58 35K 36K 78643K 110 0 ioctlops 0 0K 4K 78643K 1685 0 iov 0 0K 16K 78643K 327 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1444 90K 91K 78643K 3447 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 54 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 122 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 89K 78643K 3130 0 sigio 0 0K 0K 78643K 108 0 proc 69 91K 128K 78643K 776 0 subproc 91 5K 6K 78643K 156 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 121 0 in_multi 88 6K 7K 78643K 171 0 ether_multi 1 0K 0K 78643K 1 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 217 970K 970K 78643K 217 0 exec 0 0K 1K 78643K 1004 0 pfkey data 0 0K 0K 78643K 3 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 358 81K 105K 78643K 32963 0 UVM aobj 131 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 105 0 NDP 11 0K 1K 78643K 61 0 temp 74 5919K 6000K 78643K 30043 0 kqueue 12 18K 24K 78643K 179 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 153 0 150 3 2 1 3 0 8 0 rtentry 112 193 0 92 4 0 4 4 0 8 0 unpcb 144 2106 0 2078 29 27 2 11 0 8 0 syncache 304 38 0 38 7 7 0 1 0 8 0 tcpqe 32 313 0 313 5 5 0 1 0 8 0 tcpcb 808 3162 0 3156 70 69 1 14 0 8 0 arp 120 26 0 10 1 0 1 1 0 8 0 inpcb 368 4154 0 4145 59 58 1 14 0 8 0 nd6 136 39 0 16 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 1 0 1 0 8 0 kcovpl 48 12 0 5 1 0 1 1 0 8 0 ppxss 1256 13 0 13 3 3 0 1 0 8 0 pffrag 232 8 0 7 3 2 1 1 0 482 0 pffrnode 88 8 0 7 3 2 1 1 0 8 0 pffrent 40 27 0 26 3 2 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 24 122 0 116 1 0 1 1 0 8 0 pfstkey 128 122 0 116 2 0 2 2 0 8 0 pfstate 376 122 0 116 4 1 3 4 0 8 1 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 645 0 227 29 0 29 29 0 8 2 art_table 32 646 0 227 4 0 4 4 0 8 0 art_node 16 157 0 65 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 4 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 54 0 44 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 5635 0 4170 93 0 93 93 0 8 0 ffsino 272 5635 0 4170 99 0 99 99 0 8 0 nchpl 144 9950 0 8302 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 35696 0 35696 3 2 1 2 0 8 1 percpumem 16 68 0 26 1 0 1 1 0 8 0 vmpool 696 34 0 34 5 5 0 1 0 8 0 kstatmem 264 74 0 52 2 0 2 2 0 8 0 scxspl 216 32773 0 32773 18 17 1 8 1 8 1 plimitpl 152 320 0 305 1 0 1 1 0 8 0 sigapl 424 3466 0 3399 10 2 8 8 0 8 0 futexpl 64 25382 0 25376 1 0 1 1 0 8 0 knotepl 120 222 0 0 7 0 7 7 0 8 1 kqueuepl 216 480 0 472 7 6 1 5 0 8 0 pipepl 320 809 0 784 15 12 3 8 0 8 0 fdescpl 496 3427 0 3399 5 0 5 5 0 8 0 filepl 152 23458 0 23221 60 49 11 23 0 8 0 lockfpl 104 1575 0 1573 5 4 1 2 0 8 0 lockfspl 48 569 0 567 1 0 1 1 0 8 0 sessionpl 144 30 0 14 1 0 1 1 0 8 0 pgrppl 48 81 0 65 1 0 1 1 0 8 0 ucredpl 104 3432 0 3419 1 0 1 1 0 8 0 zombiepl 144 3400 0 3399 1 0 1 1 0 8 0 processpl 1072 3466 0 3399 5 0 5 5 0 8 0 procpl 680 8922 0 8833 14 5 9 10 0 8 1 sosppl 168 22 0 22 4 4 0 1 0 8 0 sockpl 488 6419 0 6376 150 144 6 39 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 21 0 0 3 1 2 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 13 0 0 2 0 2 2 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 261 0 0 33 1 32 33 0 8 0 mtagpl 96 1043 0 0 25 0 25 25 0 8 0 mbufpl 256 2315 0 0 143 0 143 143 0 8 0 bufpl 288 9551 0 3225 452 0 452 452 0 8 0 anonpl 24 428546 0 414603 166 5 161 161 0 186 73 amapchunkpl 152 104185 0 103305 70 8 62 62 0 158 25 amappl16 200 8394 0 8026 23 2 21 21 0 8 0 amappl15 192 46 0 46 2 2 0 1 0 8 0 amappl14 184 182 0 164 2 1 1 2 0 8 0 amappl13 176 11 0 11 1 1 0 1 0 8 0 amappl12 168 4190 0 4160 3 1 2 2 0 8 0 amappl11 160 59 0 45 1 0 1 1 0 8 0 amappl10 152 35 0 27 1 0 1 1 0 8 0 amappl9 144 273 0 272 1 0 1 1 0 8 0 amappl8 136 296 0 212 3 0 3 3 0 8 0 amappl7 128 84 0 73 2 0 2 2 0 8 0 amappl6 120 310 0 288 2 1 1 2 0 8 0 amappl5 112 263 0 251 1 0 1 1 0 8 0 amappl4 104 690 0 641 3 0 3 3 0 8 0 amappl3 96 20862 0 20783 4 1 3 3 0 8 0 amappl2 88 3769 0 3697 3 1 2 3 0 8 0 amappl1 80 21003 0 20447 23 10 13 23 0 8 0 amappl 88 32288 0 32062 6 0 6 6 0 92 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 3461 0 3433 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3461 0 3433 1 0 1 1 0 8 0 vmmpekpl 168 30880 0 30817 4 0 4 4 0 8 0 vmmpepl 168 218188 0 215901 163 56 107 122 0 357 0 vmsppl 464 3460 0 3433 5 0 5 5 0 8 0 rwobjpl 56 63774 0 56244 108 1 107 107 0 8 0 pdppl 4096 6930 0 6866 316 250 66 82 0 8 2 pvpl 32 1103897 0 1084004 470 184 286 338 0 265 119 pmappl 248 3460 0 3433 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1332 0 391 28 0 28 28 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace witness_checkorder(fffffd807e8b30e8,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd807e8b30d8) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff80002120d800,fffffd807e8b30d8,fffffd807e8b3160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff80002120d800,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff80002120d800) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff80002120d800,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff80002120d800,ffff800022d00f70,ffff800022d00fc0) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800022d01040) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800022d01040) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75a4f544c7c0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 kd_curproc sys/dev/kcov.c:590 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 sys/dev/kcov.c:158 __mp_lock(ffffffff82cdebd8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 ktrstruct(ffff8000211b2d50,ffffffff8283f357,ffff80002125d060,10) at ktrstruct+0xda sys/kern/kern_ktrace.c:307 sys_kevent(ffff8000211b2d50,ffff80002125d120,ffff80002125d170) at sys_kevent+0x435 sys/kern/kern_event.c:1001 syscall(ffff80002125d1f0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002125d1f0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e5c62200, count: 6 ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 kd_curproc sys/dev/kcov.c:590 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 sys/dev/kcov.c:158 __mp_lock(ffffffff82cdebd8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82cdebd8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 ktrstruct(ffff8000211b2d50,ffffffff8283f357,ffff80002125d060,10) at ktrstruct+0xda sys/kern/kern_ktrace.c:307 sys_kevent(ffff8000211b2d50,ffff80002125d120,ffff80002125d170) at sys_kevent+0x435 sys/kern/kern_event.c:1001 syscall(ffff80002125d1f0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002125d1f0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2e5c62200, count: -9