panic: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/main/kernel/sys/net/if_tun.c", line 315 Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff828870a3) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff82909685,ffffffff8293e2f4,13b,ffffffff8291c640) at __assert+0x29 sys/kern/subr_prf.c:157 tun_clone_destroy(ffff800000dcb000) at tun_clone_destroy+0x234 sys/net/if_tun.c:315 if_clone_destroy(ffff80002a672fd0) at if_clone_destroy+0x132 sys/net/if.c:1384 tun_dev_close(2802,1) at tun_dev_close+0x141 sys/net/if_tun.c:521 spec_close(ffff80002a6730b0) at spec_close+0x2c7 sys/kern/spec_vnops.c:538 VOP_CLOSE(fffffd8060ce02d0,1,fffffd807f7d76e8,ffff80002a668d68) at VOP_CLOSE+0xe2 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d111178,ffff80002a668d68) at vn_closefile+0xd6 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d111178,ffff80002a668d68) at vn_closefile+0xd6 sys/kern/vfs_vnops.c:609 fdrop(fffffd806d111178,ffff80002a668d68) at fdrop+0xcb sys/kern/kern_descrip.c:1274 closef(fffffd806d111178,ffff80002a668d68) at closef+0x11b sys/kern/kern_descrip.c:1258 fdfree(ffff80002a668d68) at fdfree+0xf3 sys/kern/kern_descrip.c:1190 exit1(ffff80002a668d68,0,0,1) at exit1+0x367 sys/kern/kern_exit.c:199 sys_exit(ffff80002a668d68,ffff80002a673420,ffff80002a673370) at sys_exit+0x1a sys/kern/kern_exit.c:89 end trace frame: 0xffff80002a673410, count: 0 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 "sc->sc_dev == 0" failed: file "/syzkaller/managers/main/kernel/sys/net/if_tun.c", line 315 ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff828870a3) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff82909685,ffffffff8293e2f4,13b,ffffffff8291c640) at __assert+0x29 sys/kern/subr_prf.c:157 tun_clone_destroy(ffff800000dcb000) at tun_clone_destroy+0x234 sys/net/if_tun.c:315 if_clone_destroy(ffff80002a672fd0) at if_clone_destroy+0x132 sys/net/if.c:1384 tun_dev_close(2802,1) at tun_dev_close+0x141 sys/net/if_tun.c:521 spec_close(ffff80002a6730b0) at spec_close+0x2c7 sys/kern/spec_vnops.c:538 VOP_CLOSE(fffffd8060ce02d0,1,fffffd807f7d76e8,ffff80002a668d68) at VOP_CLOSE+0xe2 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d111178,ffff80002a668d68) at vn_closefile+0xd6 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d111178,ffff80002a668d68) at vn_closefile+0xd6 sys/kern/vfs_vnops.c:609 fdrop(fffffd806d111178,ffff80002a668d68) at fdrop+0xcb sys/kern/kern_descrip.c:1274 closef(fffffd806d111178,ffff80002a668d68) at closef+0x11b sys/kern/kern_descrip.c:1258 fdfree(ffff80002a668d68) at fdfree+0xf3 sys/kern/kern_descrip.c:1190 exit1(ffff80002a668d68,0,0,1) at exit1+0x367 sys/kern/kern_exit.c:199 sys_exit(ffff80002a668d68,ffff80002a673420,ffff80002a673370) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a673420) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7aac8bf607c0, count: -16 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002a672e60 rbx 0xffffffff816cdda0 tunclose rdx 0 rcx 0 rax 0xffff80002a668d68 r8 0x101010101010101 r9 0x8080808080808080 r10 0x10748880450003ce r11 0xfd79aec3774d79ab r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff81a4b53c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff80002a672e50 ss 0 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.7) tid=260576 pid=76509 tcnt=1 stat=onproc flags process=1008 proc=2000 runpri=8, usrpri=78, slppri=8, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a668d68 forw=0xffffffffffffffff, list=0xffff800030f42560,0xffff800030f422c8 process=0xffff8000377d10e0 user=0xffff80002a66e000, vmspace=0xfffffd806ef26c68 estcpu=28, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 18051 159190 7228 0 3 0x80 nanoslp syz-executor.2 18051 514088 7228 0 3 0x4000080 lockf syz-executor.2 18051 296783 7228 0 3 0x4000080 fsleep syz-executor.2 18051 373993 7228 0 3 0x4000080 fsleep syz-executor.2 13135 140561 44178 0 2 0 syz-executor.0 13135 510327 44178 0 2 0x4000000 syz-executor.0 13135 67030 44178 0 3 0x4000080 fsleep syz-executor.0 39248 37174 70852 0 2 0 syz-executor.5 39248 121298 70852 0 3 0x4000080 lockf syz-executor.5 39248 160029 70852 0 3 0x4000080 pipewr syz-executor.5 39248 182796 70852 0 2 0x4000000 syz-executor.5 95875 131925 31207 0 2 0x2 syz-executor.4 7228 228186 31207 0 3 0x82 nanoslp syz-executor.2 31361 290965 31207 0 2 0x2 syz-executor.6 70852 34426 31207 0 3 0x82 nanoslp syz-executor.5 44178 432013 31207 0 3 0x82 nanoslp syz-executor.0 66814 140068 31207 0 3 0x82 wait syz-executor.7 481 102654 31207 0 3 0x82 nanoslp syz-executor.3 35247 275294 31207 0 2 0x2 syz-executor.1 14137 199926 0 0 3 0x14280 nfsidl nfsio 42624 403618 0 0 3 0x14280 nfsidl nfsio 4226 488109 0 0 3 0x14280 nfsidl nfsio 73423 266458 0 0 3 0x14280 nfsidl nfsio 47952 20420 0 0 3 0x14280 nfsidl nfsio 64511 168005 0 0 3 0x14280 nfsidl nfsio 23601 475540 0 0 3 0x14280 nfsidl nfsio 42518 229584 0 0 3 0x14280 nfsidl nfsio 15471 158083 0 0 3 0x14280 nfsidl nfsio 40967 320409 0 0 3 0x14280 nfsidl nfsio 88181 161732 0 0 3 0x14280 nfsidl nfsio 76617 163108 0 0 3 0x14280 nfsidl nfsio 12419 69567 0 0 3 0x14280 nfsidl nfsio 88998 311963 0 0 3 0x14280 nfsidl nfsio 54568 63736 0 0 3 0x14280 nfsidl nfsio 92844 462708 0 0 3 0x14280 nfsidl nfsio 57681 317397 0 0 3 0x14280 nfsidl nfsio 55452 63872 0 0 3 0x14280 nfsidl nfsio 94454 16578 0 0 3 0x14280 nfsidl nfsio 25540 231507 0 0 3 0x14280 nfsidl nfsio 70002 139857 0 0 3 0x14200 bored sosplice 31207 146882 15125 0 3 0x2000082 wait syz-fuzzer 31207 33575 15125 0 3 0x6000082 thrsleep syz-fuzzer 31207 484386 15125 0 3 0x6000082 thrsleep syz-fuzzer 31207 262031 15125 0 3 0x6000082 wait syz-fuzzer 31207 488583 15125 0 3 0x6000082 thrsleep syz-fuzzer 31207 102947 15125 0 3 0x6000082 kqread syz-fuzzer 31207 9713 15125 0 3 0x6000082 wait syz-fuzzer 31207 438090 15125 0 3 0x6000082 wait syz-fuzzer 31207 87733 15125 0 3 0x6000082 thrsleep syz-fuzzer 31207 291467 15125 0 3 0x6000082 wait syz-fuzzer 31207 495855 15125 0 3 0x6000082 thrsleep syz-fuzzer 31207 452613 15125 0 3 0x6000082 wait syz-fuzzer 31207 360353 15125 0 3 0x6000082 wait syz-fuzzer 31207 295091 15125 0 3 0x6000082 wait syz-fuzzer 15125 74724 12016 0 3 0x10008a sigsusp ksh 12016 346362 82468 0 3 0x9a kqread sshd 88487 305471 1 0 3 0x100083 ttyin getty 82468 373178 1 0 3 0x88 kqread sshd 16823 151874 22370 73 3 0x1100090 kqread syslogd 22370 491482 1 0 3 0x100082 netio syslogd 13670 517794 1 0 3 0x100080 kqread resolvd 32207 145395 0 0 3 0x14200 bored smr 42046 344793 0 0 2 0x14200 zerothread 22251 490548 0 0 3 0x14200 aiodoned aiodoned 73974 450779 0 0 3 0x14200 syncer update 55059 99081 0 0 3 0x14200 cleaner cleaner 77952 484395 0 0 3 0x14200 reaper reaper 86036 315155 0 0 3 0x14200 pgdaemon pagedaemon 29934 124206 0 0 3 0x14200 bored viomb 18092 74602 0 0 3 0x40014200 acpi0 acpi0 69811 30651 0 0 3 0x14200 bored softnet3 74527 320128 0 0 3 0x14200 bored softnet2 1033 238047 0 0 3 0x14200 bored softnet1 99053 289112 0 0 3 0x14200 bored softnet0 71457 301974 0 0 3 0x14200 bored systqmp 49946 459921 0 0 3 0x14200 bored systq 92787 301643 0 0 2 0x40014200 softclock 29985 404031 0 0 3 0x40014200 idle0 1 499578 0 0 3 0x80082 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 10166 6407K 7185K 166960K 13018 0 pcb 15 20K 22K 166960K 643 0 rtable 182 13K 15K 166960K 1172 0 pf 30 9K 9K 166960K 199 0 ifaddr 35 10K 11K 166960K 171 0 ifgroup 51 2K 2K 166960K 324 0 sysctl 3 1K 1K 166960K 9 0 counters 30 17K 17K 166960K 102 0 ioctlops 0 0K 2K 166960K 291 0 iov 0 0K 48K 166960K 622 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1347 84K 84K 166960K 2646 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 52 0 VM map 2 1K 1K 166960K 2 0 sem 10 1K 1K 166960K 18 0 dirhash 12 2K 3K 166960K 39 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 14 49K 69K 166960K 5013 0 sigio 0 0K 0K 166960K 168 0 proc 52 42K 75K 166960K 1097 0 subproc 104 6K 6K 166960K 310 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 507 0 in_multi 72 5K 7K 166960K 289 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 1275 0 pfkey data 0 0K 0K 166960K 70 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 366 234K 244K 166960K 48254 0 UVM aobj 131 4K 4K 166960K 142 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 254 0 NDP 11 0K 2K 166960K 130 0 temp 74 6764K 6892K 166960K 44517 0 kqueue 7 12K 24K 166960K 364 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 120 378 0 376 3 2 1 3 0 8 0 rtentry 112 332 0 251 4 1 3 4 0 8 0 unpcb 144 4061 0 4055 11 5 6 6 0 8 5 syncache 320 53 0 53 2 1 1 1 0 8 1 tcpqe 32 298 0 298 1 1 0 1 0 8 0 tcpcb 808 2154 0 2141 22 11 11 16 0 8 8 arp 88 64 0 52 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 4 0 4 1 1 0 1 0 8 0 inpcb 344 5254 0 5239 25 13 12 17 0 8 8 nd6 104 77 0 60 1 0 1 1 0 8 0 pkpcb 40 119 0 119 2 1 1 1 0 8 1 kcovpl 48 23 0 15 1 0 1 1 0 8 0 ppxss 1072 20 0 20 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1259 0 877 32 5 27 29 0 8 0 art_table 32 1260 0 877 4 0 4 4 0 8 0 art_node 16 331 0 258 1 0 1 1 0 8 0 sysvmsgpl 40 76 0 75 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 139 0 11 4 0 4 4 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 8020 0 6559 92 0 92 92 0 8 0 ffsino 240 8020 0 6559 87 0 87 87 0 8 0 nchpl 144 14892 0 14397 63 41 22 63 0 8 1 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 53109 0 53107 4 3 1 3 0 8 0 vcpupl 2048 34 0 0 5 0 5 5 0 8 0 vmpool 664 42 0 8 3 0 3 3 0 8 0 kstatmem 264 166 0 144 2 0 2 2 0 8 0 scxspl 216 44255 0 44255 9 7 2 8 1 8 2 plimitpl 152 529 0 515 1 0 1 1 0 8 0 sigapl 424 5502 0 5442 8 0 8 8 0 8 0 futexpl 64 48009 0 48006 1 0 1 1 0 8 0 knotepl 120 47229 0 47163 11 7 4 10 0 8 1 kqueuepl 184 1198 0 1190 5 3 2 4 0 8 1 pipepl 288 994 0 963 11 4 7 7 0 8 4 fdescpl 432 5263 0 5241 4 0 4 4 0 8 0 filepl 120 35026 0 34790 23 7 16 16 0 8 6 lockfpl 104 1472 0 1468 3 1 2 2 0 8 1 lockfspl 48 485 0 483 1 0 1 1 0 8 0 sessionpl 144 38 0 23 1 0 1 1 0 8 0 pgrppl 48 171 0 156 1 0 1 1 0 8 0 ucredpl 104 4195 0 4184 1 0 1 1 0 8 0 zombiepl 144 5444 0 5442 1 0 1 1 0 8 0 processpl 1072 5502 0 5442 5 0 5 5 0 8 0 procpl 680 13055 0 12974 10 1 9 9 0 8 1 sosppl 168 36 0 36 1 0 1 1 0 8 1 sockpl 488 9816 0 9793 169 156 13 30 0 8 7 mcl64k 65536 239 0 239 2 1 1 1 0 8 1 mcl16k 16384 135 0 135 2 1 1 1 0 8 1 mcl12k 12288 250 0 250 2 1 1 1 0 8 1 mcl9k 9216 59 0 59 2 1 1 1 0 8 1 mcl8k 8192 405 0 405 2 1 1 1 0 8 1 mcl4k 4096 585 0 585 3 2 1 2 0 8 1 mcl2k2 2112 32 0 32 1 0 1 1 0 8 1 mcl2k 2048 81272 0 81220 29 21 8 27 0 8 1 mtagpl 96 69 0 69 3 2 1 2 0 8 1 mbufpl 256 180399 0 180261 166 142 24 73 0 8 8 bufpl 280 12558 0 6166 457 0 457 457 0 8 0 anonpl 24 568433 0 556130 96 7 89 96 0 188 0 amapchunkpl 152 152960 0 152153 50 14 36 50 0 158 1 amappl16 200 10841 0 10429 24 0 24 24 0 8 0 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 207 0 196 2 1 1 2 0 8 0 amappl13 176 15 0 15 1 1 0 1 0 8 0 amappl12 168 6115 0 6090 2 0 2 2 0 8 0 amappl11 160 54 0 49 1 0 1 1 0 8 0 amappl10 152 45 0 37 1 0 1 1 0 8 0 amappl9 144 216 0 215 1 0 1 1 0 8 0 amappl8 136 297 0 222 3 0 3 3 0 8 0 amappl7 128 218 0 195 2 0 2 2 0 8 0 amappl6 120 534 0 518 1 0 1 1 0 8 0 amappl5 112 225 0 219 1 0 1 1 0 8 0 amappl4 104 592 0 569 2 1 1 2 0 8 0 amappl3 96 30533 0 30454 3 0 3 3 0 8 0 amappl2 88 5918 0 5861 3 1 2 3 0 8 0 amappl1 80 27852 0 27444 21 10 11 21 0 8 0 amappl 88 47504 0 47284 7 1 6 7 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 72 141 0 11 3 0 3 3 0 8 0 uaddrrnd 24 5305 0 5249 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5305 0 5249 1 0 1 1 0 8 0 vmmpekpl 168 41985 0 41919 4 0 4 4 0 8 0 vmmpepl 168 325869 0 323931 140 26 114 129 0 357 10 vmsppl 352 5304 0 5249 6 0 6 6 0 8 0 rwobjpl 24 84928 0 77560 46 0 46 46 0 8 0 pdppl 4096 10616 0 10532 357 265 92 95 0 8 8 pvpl 32 1519365 0 1502085 300 139 161 300 0 265 0 pmappl 216 5304 0 5249 4 0 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 831 0 459 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(ffffffff828870a3) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff82909685,ffffffff8293e2f4,13b,ffffffff8291c640) at __assert+0x29 sys/kern/subr_prf.c:157 tun_clone_destroy(ffff800000dcb000) at tun_clone_destroy+0x234 sys/net/if_tun.c:315 if_clone_destroy(ffff80002a672fd0) at if_clone_destroy+0x132 sys/net/if.c:1384 tun_dev_close(2802,1) at tun_dev_close+0x141 sys/net/if_tun.c:521 spec_close(ffff80002a6730b0) at spec_close+0x2c7 sys/kern/spec_vnops.c:538 VOP_CLOSE(fffffd8060ce02d0,1,fffffd807f7d76e8,ffff80002a668d68) at VOP_CLOSE+0xe2 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d111178,ffff80002a668d68) at vn_closefile+0xd6 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d111178,ffff80002a668d68) at vn_closefile+0xd6 sys/kern/vfs_vnops.c:609 fdrop(fffffd806d111178,ffff80002a668d68) at fdrop+0xcb sys/kern/kern_descrip.c:1274 closef(fffffd806d111178,ffff80002a668d68) at closef+0x11b sys/kern/kern_descrip.c:1258 fdfree(ffff80002a668d68) at fdfree+0xf3 sys/kern/kern_descrip.c:1190 exit1(ffff80002a668d68,0,0,1) at exit1+0x367 sys/kern/kern_exit.c:199 sys_exit(ffff80002a668d68,ffff80002a673420,ffff80002a673370) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a673420) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7aac8bf607c0, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff828870a3) at panic+0x165 sys/kern/subr_prf.c:198 __assert(ffffffff82909685,ffffffff8293e2f4,13b,ffffffff8291c640) at __assert+0x29 sys/kern/subr_prf.c:157 tun_clone_destroy(ffff800000dcb000) at tun_clone_destroy+0x234 sys/net/if_tun.c:315 if_clone_destroy(ffff80002a672fd0) at if_clone_destroy+0x132 sys/net/if.c:1384 tun_dev_close(2802,1) at tun_dev_close+0x141 sys/net/if_tun.c:521 spec_close(ffff80002a6730b0) at spec_close+0x2c7 sys/kern/spec_vnops.c:538 VOP_CLOSE(fffffd8060ce02d0,1,fffffd807f7d76e8,ffff80002a668d68) at VOP_CLOSE+0xe2 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806d111178,ffff80002a668d68) at vn_closefile+0xd6 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806d111178,ffff80002a668d68) at vn_closefile+0xd6 sys/kern/vfs_vnops.c:609 fdrop(fffffd806d111178,ffff80002a668d68) at fdrop+0xcb sys/kern/kern_descrip.c:1274 closef(fffffd806d111178,ffff80002a668d68) at closef+0x11b sys/kern/kern_descrip.c:1258 fdfree(ffff80002a668d68) at fdfree+0xf3 sys/kern/kern_descrip.c:1190 exit1(ffff80002a668d68,0,0,1) at exit1+0x367 sys/kern/kern_exit.c:199 sys_exit(ffff80002a668d68,ffff80002a673420,ffff80002a673370) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a673420) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7aac8bf607c0, count: -16