uvm_fault(0xfffffd8008a16ae0, 0x9, 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 277248 59688 0 0x2 0 0 syz-executor.0 witness_checkorder(fffffd80788b9298,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd80788b9288) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000289cfd58,fffffd80788b9288,fffffd80788b9310,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000289cfd58,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000289cfd58) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000289cfd58,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000289cfd58,ffff800026159e30,ffff800026159e80) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800026159f00) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800026159f00) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f2aaf7db000, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd8008a16ae0, 0x9, 0, 1) -> e ddb{1}> trace witness_checkorder(fffffd80788b9298,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd80788b9288) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000289cfd58,fffffd80788b9288,fffffd80788b9310,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000289cfd58,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000289cfd58) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000289cfd58,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000289cfd58,ffff800026159e30,ffff800026159e80) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800026159f00) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800026159f00) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f2aaf7db000, count: -9 ddb{1}> show registers rdi 0 rsi 0x20000 acpi_pdirpa+0xbe63 rbp 0xffff800026159bd0 rbx 0xe rdx 0 rcx 0xffff8000289cfd58 rax 0xffff800020d58ff0 r8 0x25 r9 0x1 r10 0 r11 0xdc1257d70177fac6 r12 0 r13 0xfffffd80788b9298 r14 0x1 r15 0xffff8000289cfd58 rip 0xffffffff814ce85c witness_checkorder+0x1ec cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800026159b20 ss 0x10 witness_checkorder+0x1ec: movl 0x8(%r14),%ebx ddb{1}> show proc PROC (syz-executor.7) pid=381184 stat=onproc flags process=1008 proc=2000 pri=0, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000289cf2b8,0xffff8000289ce828 process=0xffff80002e455510 user=0xffff800026154000, vmspace=0xfffffd8008a16ae0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79838 365974 20949 0 2 0x480 syz-executor.6 79838 340938 20949 0 3 0x4000080 fsleep syz-executor.6 79838 29026 20949 0 3 0x4000080 fsleep syz-executor.6 26663 390426 92281 0 2 0 syz-executor.3 26663 33846 92281 0 3 0x4000080 fsleep syz-executor.3 15621 16437 55162 0 3 0x80 nanoslp syz-executor.1 15621 76246 55162 0 3 0x4000080 netio syz-executor.1 4671 65330 59688 0 3 0x80 nanoslp syz-executor.0 4671 111871 59688 0 3 0x4000080 rest syz-executor.0 54598 302766 85848 0 3 0x80 nanoslp syz-executor.2 54598 127857 85848 0 3 0x4000080 fsleep syz-executor.2 54598 200340 85848 0 3 0x4000080 fsleep syz-executor.2 54598 33546 85848 0 3 0x4000080 fsleep syz-executor.2 12474 516914 0 0 3 0x14200 acct acct 34585 387269 0 0 3 0x14280 nfsidl nfsio 71272 133015 0 0 3 0x14280 nfsidl nfsio 82769 434065 0 0 3 0x14280 nfsidl nfsio 63935 443714 0 0 3 0x14280 nfsidl nfsio 54660 480634 0 0 3 0x14280 nfsidl nfsio 62492 173854 0 0 3 0x14280 nfsidl nfsio 64312 30506 0 0 3 0x14280 nfsidl nfsio 93996 306166 0 0 3 0x14280 nfsidl nfsio 28124 326409 0 0 3 0x14280 nfsidl nfsio 96803 360852 0 0 3 0x14280 nfsidl nfsio 69487 47068 0 0 3 0x14280 nfsidl nfsio 67475 342631 0 0 3 0x14280 nfsidl nfsio 87896 434637 0 0 3 0x14280 nfsidl nfsio 73152 291698 0 0 3 0x14280 nfsidl nfsio 3648 381783 0 0 3 0x14280 nfsidl nfsio 69582 524234 0 0 3 0x14280 nfsidl nfsio 57301 39262 0 0 3 0x14280 nfsidl nfsio 51046 461559 0 0 3 0x14280 nfsidl nfsio 44901 521634 0 0 3 0x14280 nfsidl nfsio 30558 195294 0 0 3 0x14280 nfsidl nfsio 43135 81643 0 0 3 0x14200 bored sosplice 81543 483360 83685 0 2 0x482 syz-executor.7 20949 491697 83685 0 2 0x482 syz-executor.6 72832 372204 83685 0 3 0x82 nanoslp syz-executor.5 55162 61430 83685 0 2 0x482 syz-executor.1 92281 54858 83685 0 2 0x482 syz-executor.3 85848 472052 83685 0 2 0x2 syz-executor.2 79231 473528 83685 0 2 0x482 syz-executor.4 59688 277248 83685 0 7 0x2 syz-executor.0 83685 42123 10822 0 3 0x2000082 wait syz-fuzzer 83685 184888 10822 0 3 0x6000082 thrsleep syz-fuzzer 83685 344282 10822 0 3 0x6000082 thrsleep syz-fuzzer 83685 479067 10822 0 3 0x6000082 wait syz-fuzzer 83685 213642 10822 0 3 0x6000082 wait syz-fuzzer 83685 52859 10822 0 3 0x6000082 thrsleep syz-fuzzer 83685 130972 10822 0 3 0x6000082 wait syz-fuzzer 83685 342758 10822 0 3 0x6000082 wait syz-fuzzer 83685 340370 10822 0 3 0x6000082 kqread syz-fuzzer 83685 459806 10822 0 3 0x6000082 wait syz-fuzzer 83685 5238 10822 0 3 0x6000082 thrsleep syz-fuzzer 83685 364056 10822 0 3 0x6000082 wait syz-fuzzer 83685 256202 10822 0 3 0x6000082 wait syz-fuzzer 83685 219886 10822 0 3 0x6000082 thrsleep syz-fuzzer 83685 481681 10822 0 3 0x6000082 thrsleep syz-fuzzer 10822 438772 41861 0 3 0x10008a sigsusp ksh 41861 190161 92923 0 3 0x9a kqread sshd 23142 73472 1 0 3 0x100083 ttyin getty 92923 325644 1 0 3 0x88 kqread sshd 37404 305881 86881 74 3 0x1100092 bpf pflogd 86881 77459 1 0 3 0x80 netio pflogd 32737 344874 96943 73 3 0x1100090 kqread syslogd 96943 486572 1 0 3 0x100082 netio syslogd 6465 391218 1 0 3 0x100080 kqread resolvd 17599 345179 80424 77 3 0x100092 kqread dhcpleased 14746 132358 80424 77 3 0x100092 kqread dhcpleased 80424 107075 1 0 3 0x80 kqread dhcpleased 50525 206484 0 0 3 0x14200 bored smr 70671 333288 0 0 2 0x14200 zerothread 49990 373682 0 0 3 0x14200 aiodoned aiodoned 42262 279068 0 0 3 0x14200 syncer update 76439 373987 0 0 3 0x14200 cleaner cleaner 23429 264906 0 0 2 0x14200 reaper 68523 219960 0 0 3 0x14200 pgdaemon pagedaemon 61660 403157 0 0 3 0x14200 bored viomb 12184 79349 0 0 3 0x40014200 acpi0 acpi0 65912 394148 0 0 3 0x40014200 idle1 18059 425767 0 0 3 0x14200 bored softnet3 69285 29606 0 0 3 0x14200 bored softnet2 67618 140249 0 0 3 0x14200 bored softnet1 4227 417484 0 0 3 0x14200 bored softnet0 64498 521335 0 0 3 0x14200 bored systqmp 70176 520954 0 0 3 0x14200 bored systq 23431 397119 0 0 3 0x40014200 bored softclock 6865 23534 0 0 3 0x40014200 idle0 1 119063 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10200 6548K 6758K 78643K 12343 0 pcb 14 12K 14K 78643K 123 0 rtable 237 7K 7K 78643K 362 0 pf 32 9K 10K 78643K 47 0 ifaddr 45 15K 15K 78643K 49 0 ifgroup 55 2K 2K 78643K 59 0 sysctl 2 0K 0K 78643K 2 0 counters 60 35K 36K 78643K 64 0 ioctlops 0 0K 4K 78643K 1560 0 iov 0 0K 16K 78643K 27 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1414 88K 88K 78643K 1664 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 3 5K 5K 78643K 13 0 VM map 2 1K 1K 78643K 2 0 sem 10 1K 1K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 16 57K 93K 78643K 704 0 sigio 0 0K 0K 78643K 36 0 proc 68 91K 128K 78643K 560 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 15 0 in_multi 99 7K 7K 78643K 105 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 475 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 338 89K 99K 78643K 9270 0 UVM aobj 50 2K 2K 78643K 50 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 4 0 NDP 12 0K 1K 78643K 30 0 temp 41 5908K 5986K 78643K 6150 0 kqueue 13 20K 22K 78643K 53 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 43 0 40 1 0 1 1 0 8 0 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 144 1670 0 1651 13 4 9 10 0 8 8 syncache 304 13 0 13 3 2 1 1 0 8 1 tcpqe 32 1176 0 1176 5 5 0 3 0 8 0 tcpcb 808 324 0 247 13 5 8 11 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 368 540 0 457 12 4 8 10 0 8 0 nd6 136 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1256 2 0 2 1 1 0 1 0 8 0 pffrag 232 5 0 5 1 1 0 1 0 482 0 pffrnode 88 5 0 5 1 1 0 1 0 8 0 pffrent 40 10 0 10 1 1 0 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 54 0 19 1 0 1 1 0 8 0 pfstkey 128 54 0 19 2 0 2 2 0 8 0 pfstate 376 54 0 19 5 0 5 5 0 8 0 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 256 452 0 0 29 0 29 29 0 8 0 art_table 32 453 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 47 0 0 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2252 0 804 91 0 91 91 0 8 0 ffsino 272 2252 0 804 97 0 97 97 0 8 0 nchpl 144 3295 0 1604 63 0 63 63 0 8 0 uvmvnodes 80 2652 0 0 55 0 55 55 0 8 0 vnodes 216 2652 0 0 148 0 148 148 0 8 0 namei 1024 11583 0 11583 2 1 1 2 0 8 1 percpumem 16 45 0 2 1 0 1 1 0 8 0 vmpool 696 43 0 43 1 1 0 1 0 8 0 kstatmem 264 28 0 4 2 0 2 2 0 8 0 scxspl 216 11121 0 11121 11 10 1 8 1 8 1 plimitpl 152 43 0 27 1 0 1 1 0 8 0 sigapl 424 1040 0 970 10 2 8 8 0 8 0 futexpl 64 5076 0 5070 1 0 1 1 0 8 0 knotepl 120 222 0 0 7 0 7 7 0 8 0 kqueuepl 216 51 0 42 1 0 1 1 0 8 0 pipepl 320 515 0 454 11 3 8 8 0 8 2 fdescpl 496 1001 0 972 5 1 4 5 0 8 0 filepl 152 7006 0 6626 22 4 18 20 0 8 3 lockfpl 104 50 0 48 1 0 1 1 0 8 0 lockfspl 48 26 0 24 1 0 1 1 0 8 0 sessionpl 144 24 0 7 1 0 1 1 0 8 0 pgrppl 48 102 0 85 1 0 1 1 0 8 0 ucredpl 104 473 0 461 1 0 1 1 0 8 0 zombiepl 144 973 0 970 1 0 1 1 0 8 0 processpl 1072 1040 0 970 5 0 5 5 0 8 0 procpl 680 2140 0 2047 11 2 9 9 0 8 0 sosppl 168 10 0 10 2 1 1 1 0 8 1 sockpl 488 2253 0 2148 72 58 14 35 0 8 0 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 11 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 349 0 0 43 0 43 43 0 8 0 mtagpl 96 15 0 0 1 0 1 1 0 8 0 mbufpl 256 371 0 0 23 0 23 23 0 8 0 bufpl 288 5045 0 181 348 0 348 348 0 8 0 anonpl 24 226956 0 212564 89 1 88 88 0 186 0 amapchunkpl 152 29742 0 28837 38 0 38 38 0 158 1 amappl16 200 5555 0 5131 23 0 23 23 0 8 0 amappl15 192 90 0 89 1 0 1 1 0 8 0 amappl14 184 158 0 143 2 1 1 2 0 8 0 amappl13 176 19 0 18 1 0 1 1 0 8 0 amappl12 168 1656 0 1625 4 2 2 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 75 0 66 1 0 1 1 0 8 0 amappl9 144 185 0 185 1 1 0 1 0 8 0 amappl8 136 206 0 155 2 0 2 2 0 8 0 amappl7 128 73 0 61 2 0 2 2 0 8 0 amappl6 120 229 0 210 2 1 1 2 0 8 0 amappl5 112 205 0 193 1 0 1 1 0 8 0 amappl4 104 583 0 539 3 1 2 3 0 8 0 amappl3 96 6343 0 6258 4 1 3 3 0 8 0 amappl2 88 1265 0 1194 3 1 2 3 0 8 0 amappl1 80 12185 0 11624 23 10 13 23 0 8 0 amappl 88 8733 0 8502 7 1 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 49 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1045 0 1016 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1045 0 1016 1 0 1 1 0 8 0 vmmpekpl 168 14564 0 14506 3 0 3 3 0 8 0 vmmpepl 168 81448 0 79103 138 23 115 138 0 357 9 vmsppl 464 1044 0 1016 5 1 4 5 0 8 0 rwobjpl 56 29331 0 25118 62 2 60 60 0 8 0 pdppl 4096 2098 0 2032 130 60 70 84 0 8 4 pvpl 32 528354 0 507930 368 50 318 367 0 265 152 pmappl 248 1044 0 1016 3 1 2 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 814 0 75 22 0 22 22 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82be4ff0) 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 __mp_lock(ffffffff82c82a60) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c82a60) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800021285ee0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021285ee0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79b1eaa230d0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff82be4ff0) 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 __mp_lock(ffffffff82c82a60) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82c82a60) at __mp_lock+0x122 sys/kern/kern_lock.c:147 syscall(ffff800021285ee0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021285ee0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79b1eaa230d0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at witness_checkorder+0x1ec: movl 0x8(%r14),%ebx witness_checkorder(fffffd80788b9298,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd80788b9288) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000289cfd58,fffffd80788b9288,fffffd80788b9310,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000289cfd58,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000289cfd58) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000289cfd58,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000289cfd58,ffff800026159e30,ffff800026159e80) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800026159f00) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800026159f00) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f2aaf7db000, count: 6 ddb{1}> trace witness_checkorder(fffffd80788b9298,9,0) at witness_checkorder+0x1ec sys/kern/subr_witness.c:794 mtx_enter(fffffd80788b9288) at mtx_enter+0x3e sys/kern/kern_lock.c:265 knote_remove(ffff8000289cfd58,fffffd80788b9288,fffffd80788b9310,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881 knote_fdclose(ffff8000289cfd58,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934 fdfree(ffff8000289cfd58) at fdfree+0xdf sys/kern/kern_descrip.c:1196 exit1(ffff8000289cfd58,0,0,1) at exit1+0x3e4 sys/kern/kern_exit.c:206 sys_exit(ffff8000289cfd58,ffff800026159e30,ffff800026159e80) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff800026159f00) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800026159f00) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f2aaf7db000, count: -9