panic: kernel diagnostic assertion "(pg->pg_flags & PG_BUSY) == 0" failed: file "/syzkaller/managers/main/kernel/sys/arch/amd64/amd64/pmap.c", line 1422 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *403277 29477 0 0x8000000 0x4000000 0 syz-executor.7 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8292f96e) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e3b4f,ffffffff8283e0ef,58e,ffffffff82894bf1) at __assert+0x29 sys/kern/subr_prf.c:157 pmap_destroy(fffffd806aed25f0) at pmap_destroy+0x2a4 sys/arch/amd64/amd64/pmap.c:1422 uvm_map_teardown(fffffd8069227ad0) at uvm_map_teardown+0x287 sys/uvm/uvm_map.c:2557 uvmspace_free(fffffd8069227ad0) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461 vm_teardown(ffff800035dc2c40) at vm_teardown+0x105 sys/dev/vmm/vmm.c:555 vm_terminate(ffff800035dc2ee0) at vm_terminate+0x121 sys/dev/vmm/vmm.c:688 vmmioctl(a00,80045604,ffff800035dc2ee0,9,ffff80002a6ea558) at vmmioctl+0x291 sys/dev/vmm/vmm.c:248 VOP_IOCTL(fffffd807c31c0d8,80045604,ffff800035dc2ee0,9,fffffd807f7d79c0,ffff80002a6ea558) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806c64a960,80045604,ffff800035dc2ee0,ffff80002a6ea558) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525 sys_ioctl(ffff80002a6ea558,ffff800035dc30c0,ffff800035dc3010) at sys_ioctl+0x4a5 syscall(ffff800035dc30c0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe66b1386c0, count: 1 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "(pg->pg_flags & PG_BUSY) == 0" failed: file "/syzkaller/managers/main/kernel/sys/arch/amd64/amd64/pmap.c", line 1422 ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8292f96e) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e3b4f,ffffffff8283e0ef,58e,ffffffff82894bf1) at __assert+0x29 sys/kern/subr_prf.c:157 pmap_destroy(fffffd806aed25f0) at pmap_destroy+0x2a4 sys/arch/amd64/amd64/pmap.c:1422 uvm_map_teardown(fffffd8069227ad0) at uvm_map_teardown+0x287 sys/uvm/uvm_map.c:2557 uvmspace_free(fffffd8069227ad0) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461 vm_teardown(ffff800035dc2c40) at vm_teardown+0x105 sys/dev/vmm/vmm.c:555 vm_terminate(ffff800035dc2ee0) at vm_terminate+0x121 sys/dev/vmm/vmm.c:688 vmmioctl(a00,80045604,ffff800035dc2ee0,9,ffff80002a6ea558) at vmmioctl+0x291 sys/dev/vmm/vmm.c:248 VOP_IOCTL(fffffd807c31c0d8,80045604,ffff800035dc2ee0,9,fffffd807f7d79c0,ffff80002a6ea558) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806c64a960,80045604,ffff800035dc2ee0,ffff80002a6ea558) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525 sys_ioctl(ffff80002a6ea558,ffff800035dc30c0,ffff800035dc3010) at sys_ioctl+0x4a5 syscall(ffff800035dc30c0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe66b1386c0, count: -14 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff800035dc2a30 rbx 0x1 rdx 0xffff800000dca600 rcx 0 rax 0xffff80002a6ea558 r8 0 r9 0x8080808080808080 r10 0x4b273f49b546f62 r11 0x5ae2a720531cc1db r12 0 r13 0xfffffd80063ca000 r14 0 r15 0x1 rip 0xffffffff821e115c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff800035dc2a20 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.7) tid=403277 pid=29477 tcnt=3 stat=onproc flags process=8000000 proc=4000000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a6ea038,0xffff80002a6ea2d8 process=0xffff8000ffff1d70 user=0xffff800035dbe000, vmspace=0xfffffd807c262420 estcpu=34, cpticks=1, pctcpu=1.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 66909 102124 22265 0 2 0x8000000 syz-executor.0 66909 153411 22265 0 3 0xc000080 fsleep syz-executor.0 87285 406348 37648 0 2 0x8000000 syz-executor.4 87285 279784 37648 0 3 0xc000080 fsleep syz-executor.4 87285 421598 37648 0 3 0xc000080 fsleep syz-executor.4 16994 183755 87986 0 2 0x8000000 syz-executor.3 16994 447843 87986 0 2 0xc000000 syz-executor.3 16994 323150 87986 0 3 0xc000080 fsleep syz-executor.3 29477 433394 38959 0 2 0x8000000 syz-executor.7 *29477 403277 38959 0 7 0xc000000 syz-executor.7 29477 293778 38959 0 2 0xc000000 syz-executor.7 35695 323048 45226 0 2 0x8000480 syz-executor.5 35695 391729 45226 0 3 0xc000080 dtread syz-executor.5 35695 138074 45226 0 3 0xc000080 fsleep syz-executor.5 87986 177049 76384 0 3 0x8000082 nanoslp syz-executor.3 38959 156494 76384 0 3 0x8000082 nanoslp syz-executor.7 69938 434700 1 0 3 0x18100083 ttyin getty 45226 19503 76384 0 3 0x8000082 nanoslp syz-executor.5 37648 74665 76384 0 3 0x8000082 nanoslp syz-executor.4 77303 72033 0 0 3 0x14280 nfsidl nfsio 64069 30545 0 0 3 0x14280 nfsidl nfsio 67338 27731 0 0 3 0x14280 nfsidl nfsio 10397 443906 0 0 3 0x14280 nfsidl nfsio 52180 401825 0 0 3 0x14280 nfsidl nfsio 29487 193422 0 0 3 0x14280 nfsidl nfsio 85460 28245 0 0 3 0x14280 nfsidl nfsio 57365 208058 0 0 3 0x14280 nfsidl nfsio 93929 100595 0 0 3 0x14280 nfsidl nfsio 65154 474517 0 0 3 0x14280 nfsidl nfsio 77611 146042 0 0 3 0x14280 nfsidl nfsio 23281 143567 0 0 3 0x14280 nfsidl nfsio 87685 131698 0 0 3 0x14280 nfsidl nfsio 40545 99268 0 0 3 0x14280 nfsidl nfsio 69555 380946 0 0 3 0x14280 nfsidl nfsio 61526 34647 0 0 3 0x14280 nfsidl nfsio 28281 285352 0 0 3 0x14280 nfsidl nfsio 24422 42006 0 0 3 0x14280 nfsidl nfsio 88700 175804 0 0 3 0x14280 nfsidl nfsio 40533 45449 0 0 3 0x14280 nfsidl nfsio 78567 383338 0 0 3 0x14200 bored sosplice 22265 25198 76384 0 2 0x8000482 syz-executor.0 8554 464996 76384 0 2 0x8000002 syz-executor.6 26021 20402 76384 0 2 0x8000002 syz-executor.2 79664 201775 76384 0 3 0x8000082 nanoslp syz-executor.1 76384 278151 69818 0 3 0x1a000082 thrsleep syz-fuzzer 76384 385436 69818 0 3 0x1e000082 nanoslp syz-fuzzer 76384 98590 69818 0 3 0x1e000082 wait syz-fuzzer 76384 9221 69818 0 3 0x1e000082 wait syz-fuzzer 76384 303115 69818 0 3 0x1e000082 wait syz-fuzzer 76384 355797 69818 0 3 0x1e000082 thrsleep syz-fuzzer 76384 100454 69818 0 3 0x1e000082 thrsleep syz-fuzzer 76384 183991 69818 0 3 0x1e000082 wait syz-fuzzer 76384 9741 69818 0 3 0x1e000082 kqread syz-fuzzer 76384 422636 69818 0 3 0x1e000082 wait syz-fuzzer 76384 187328 69818 0 3 0x1e000082 thrsleep syz-fuzzer 76384 310574 69818 0 3 0x1e000082 wait syz-fuzzer 76384 423040 69818 0 3 0x1e000082 wait syz-fuzzer 76384 104252 69818 0 3 0x1e000082 wait syz-fuzzer 69818 156074 79634 0 3 0x810008a sigsusp ksh 79634 122279 43687 0 3 0x1800009a kqread sshd 43687 337780 1 0 3 0x18000088 kqread sshd 43493 314288 32531 73 3 0x19100090 kqread syslogd 32531 157976 1 0 3 0x18100082 sbwait syslogd 51285 514828 1 0 3 0x18100080 kqread resolvd 50223 237824 28393 77 3 0x18100092 kqread dhcpleased 66544 347015 28393 77 3 0x18100092 kqread dhcpleased 28393 293832 1 0 3 0x18000080 kqread dhcpleased 40482 183557 0 0 3 0x14200 bored smr 10184 216915 0 0 2 0x14200 zerothread 30280 310852 0 0 3 0x14200 aiodoned aiodoned 166 494438 0 0 3 0x14200 syncer update 22528 251893 0 0 3 0x14200 cleaner cleaner 36004 393930 0 0 3 0x14200 reaper reaper 4773 343103 0 0 3 0x14200 pgdaemon pagedaemon 92180 81800 0 0 3 0x14200 bored viomb 10371 396127 0 0 3 0x40014200 acpi0 acpi0 71252 410727 0 0 3 0x14200 bored softnet3 50302 524107 0 0 3 0x14200 bored softnet2 69843 18684 0 0 3 0x14200 bored softnet1 7697 96372 0 0 3 0x14200 bored softnet0 107 122779 0 0 3 0x14200 bored systqmp 54802 52006 0 0 3 0x14200 bored systq 50049 494607 0 0 2 0x40014200 softclock 30294 420654 0 0 3 0x40014200 idle0 1 4405 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10187 6559K 10898K 166960K 13048 0 pcb 18 12K 12K 166960K 123 0 rtable 213 6K 7K 166960K 576 0 pf 30 9K 10K 166960K 62 0 ifaddr 40 10K 11K 166960K 77 0 ifgroup 55 2K 2K 166960K 111 0 sysctl 3 1K 1K 166960K 3 0 counters 30 17K 17K 166960K 44 0 ioctlops 0 0K 2K 166960K 79 0 iov 0 0K 16K 166960K 58 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1387 87K 87K 166960K 2099 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 27 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 80 0 dirhash 15 2K 3K 166960K 39 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 16 57K 73K 166960K 907 0 sigio 0 0K 0K 166960K 27 0 proc 59 67K 91K 166960K 662 0 subproc 104 6K 7K 166960K 156 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 101 0 in_multi 87 6K 7K 166960K 186 0 ether_multi 1 0K 0K 166960K 5 0 mrt 2 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 525 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 291 96K 105K 166960K 9884 0 UVM aobj 45 4K 4K 166960K 49 0 pinsyscall 36 72K 100K 166960K 2154 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 40 0 NDP 11 0K 2K 166960K 50 0 temp 76 6812K 6878K 166960K 44724 0 kqueue 13 20K 28K 166960K 150 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 110 0 107 1 0 1 1 0 8 0 rtentry 112 186 0 88 4 0 4 4 0 8 0 unpcb 144 666 0 651 1 0 1 1 0 8 0 syncache 336 6 0 6 1 0 1 1 0 8 1 tcpcb 808 275 0 270 2 0 2 2 0 8 1 arp 88 33 0 14 1 0 1 1 0 8 0 ipq 40 5 0 4 1 0 1 1 0 8 0 ipqe 40 50 0 49 1 0 1 1 0 8 0 inpcb 352 926 0 912 5 0 5 5 0 8 2 nd6 104 44 0 23 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 0 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1072 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 688 0 281 29 0 29 29 0 8 3 art_table 32 689 0 281 4 0 4 4 0 8 0 art_node 16 184 0 93 1 0 1 1 0 8 0 sysvmsgpl 40 18 0 9 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 77 0 67 1 0 1 1 0 8 0 shmpl 112 46 0 4 2 0 2 2 0 8 0 dirhash 1024 35 0 16 3 0 3 3 0 8 0 dino2pl 256 2938 0 1415 96 0 96 96 0 8 0 ffsino 240 2938 0 1415 90 0 90 90 0 8 0 nchpl 144 4388 0 2651 67 0 67 67 0 8 0 uvmvnodes 80 3555 0 0 73 0 73 73 0 8 0 vnodes 216 3555 0 0 198 0 198 198 0 8 0 namei 1024 15054 0 15053 2 0 2 2 0 8 1 vcpupl 3904 8 0 1 1 0 1 1 0 8 0 vmpool 664 9 0 1 1 0 1 1 0 8 0 kstatmem 264 50 0 28 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 19009 0 19008 8 0 8 8 1 8 7 plimitpl 152 145 0 129 1 0 1 1 0 8 0 sigapl 424 1224 0 1160 8 0 8 8 0 8 0 futexpl 64 16189 0 16184 1 0 1 1 0 8 0 knotepl 120 6956 0 6872 18 6 12 18 0 8 8 kqueuepl 184 263 0 253 1 0 1 1 0 8 0 pipepl 288 257 0 228 3 0 3 3 0 8 0 fdescpl 432 1186 0 1159 4 0 4 4 0 8 0 filepl 120 7354 0 7099 11 0 11 11 0 8 2 lockfpl 104 404 0 400 2 0 2 2 0 8 1 lockfspl 48 148 0 144 1 0 1 1 0 8 0 sessionpl 144 29 0 13 1 0 1 1 0 8 0 pgrppl 48 42 0 26 1 0 1 1 0 8 0 ucredpl 104 1098 0 1087 1 0 1 1 0 8 0 zombiepl 144 1161 0 1160 1 0 1 1 0 8 0 processpl 1072 1224 0 1160 5 0 5 5 0 8 0 procpl 656 2112 0 2026 9 0 9 9 0 8 1 sosppl 168 9 0 9 1 0 1 1 0 8 1 sockpl 504 1727 0 1697 10 0 10 10 0 8 5 mcl64k 65536 8 0 8 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 20 0 20 1 0 1 1 0 8 1 mcl4k 4096 9 0 9 1 0 1 1 0 8 1 mcl2k 2048 22353 0 22256 44 23 21 38 0 8 7 mtagpl 96 40 0 23 1 0 1 1 0 8 0 mbufpl 256 44705 0 44471 68 42 26 63 0 8 7 bufpl 280 7431 0 1102 453 0 453 453 0 8 0 anonpl 24 282842 0 276937 93 0 93 93 0 188 49 amapchunkpl 152 33013 0 32356 49 0 49 49 0 158 21 amappl16 200 7324 0 7187 29 13 16 20 0 8 8 amappl15 192 40 0 39 1 0 1 1 0 8 0 amappl14 184 176 0 165 2 0 2 2 0 8 1 amappl13 176 9 0 9 1 0 1 1 0 8 1 amappl12 168 1894 0 1865 2 0 2 2 0 8 0 amappl11 160 51 0 41 1 0 1 1 0 8 0 amappl10 152 58 0 48 1 0 1 1 0 8 0 amappl9 144 158 0 158 1 0 1 1 0 8 1 amappl8 136 127 0 96 2 0 2 2 0 8 0 amappl7 128 57 0 45 1 0 1 1 0 8 0 amappl6 120 386 0 372 2 0 2 2 0 8 1 amappl5 112 181 0 168 1 0 1 1 0 8 0 amappl4 104 541 0 512 2 0 2 2 0 8 1 amappl3 96 7007 0 6924 3 0 3 3 0 8 0 amappl2 88 1643 0 1568 4 0 4 4 0 8 2 amappl1 80 12233 0 11738 22 3 19 22 0 8 8 amappl 88 9249 0 9054 6 0 6 6 0 92 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 48 0 4 1 0 1 1 0 8 0 uaddrrnd 24 1195 0 1161 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1195 0 1161 1 0 1 1 0 8 0 vmmpekpl 168 12850 0 12792 3 0 3 3 0 8 0 vmmpepl 168 92300 0 90443 112 0 112 112 0 357 24 vmsppl 344 1194 0 1160 4 0 4 4 0 8 0 rwobjpl 24 32988 0 28312 29 0 29 29 0 8 0 pdppl 4096 2396 0 2328 121 49 72 75 0 8 4 pvpl 32 654388 0 641842 367 16 351 367 0 265 242 pmappl 216 1194 0 1160 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 476 0 114 12 0 12 12 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8292f96e) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e3b4f,ffffffff8283e0ef,58e,ffffffff82894bf1) at __assert+0x29 sys/kern/subr_prf.c:157 pmap_destroy(fffffd806aed25f0) at pmap_destroy+0x2a4 sys/arch/amd64/amd64/pmap.c:1422 uvm_map_teardown(fffffd8069227ad0) at uvm_map_teardown+0x287 sys/uvm/uvm_map.c:2557 uvmspace_free(fffffd8069227ad0) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461 vm_teardown(ffff800035dc2c40) at vm_teardown+0x105 sys/dev/vmm/vmm.c:555 vm_terminate(ffff800035dc2ee0) at vm_terminate+0x121 sys/dev/vmm/vmm.c:688 vmmioctl(a00,80045604,ffff800035dc2ee0,9,ffff80002a6ea558) at vmmioctl+0x291 sys/dev/vmm/vmm.c:248 VOP_IOCTL(fffffd807c31c0d8,80045604,ffff800035dc2ee0,9,fffffd807f7d79c0,ffff80002a6ea558) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806c64a960,80045604,ffff800035dc2ee0,ffff80002a6ea558) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525 sys_ioctl(ffff80002a6ea558,ffff800035dc30c0,ffff800035dc3010) at sys_ioctl+0x4a5 syscall(ffff800035dc30c0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe66b1386c0, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8292f96e) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff828e3b4f,ffffffff8283e0ef,58e,ffffffff82894bf1) at __assert+0x29 sys/kern/subr_prf.c:157 pmap_destroy(fffffd806aed25f0) at pmap_destroy+0x2a4 sys/arch/amd64/amd64/pmap.c:1422 uvm_map_teardown(fffffd8069227ad0) at uvm_map_teardown+0x287 sys/uvm/uvm_map.c:2557 uvmspace_free(fffffd8069227ad0) at uvmspace_free+0x96 sys/uvm/uvm_map.c:3461 vm_teardown(ffff800035dc2c40) at vm_teardown+0x105 sys/dev/vmm/vmm.c:555 vm_terminate(ffff800035dc2ee0) at vm_terminate+0x121 sys/dev/vmm/vmm.c:688 vmmioctl(a00,80045604,ffff800035dc2ee0,9,ffff80002a6ea558) at vmmioctl+0x291 sys/dev/vmm/vmm.c:248 VOP_IOCTL(fffffd807c31c0d8,80045604,ffff800035dc2ee0,9,fffffd807f7d79c0,ffff80002a6ea558) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806c64a960,80045604,ffff800035dc2ee0,ffff80002a6ea558) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525 sys_ioctl(ffff80002a6ea558,ffff800035dc30c0,ffff800035dc3010) at sys_ioctl+0x4a5 syscall(ffff800035dc30c0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe66b1386c0, count: -14