witness: lock order reversal: 1st 0xffff8000fffeb720 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80795306b8 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff8339120d -> 0xffffffff83384f88 is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 sblock+0xb6 sys/kern/uipc_socket2.c:536 #2 soreceive+0x27d sys/kern/uipc_socket.c:890 #3 fifo_read+0x117 sys/miscfs/fifofs/fifo_vnops.c:264 #4 VOP_READ+0x101 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x15b sys/kern/vfs_vnops.c:-1 #6 vndsetcred+0xa1 sys/dev/vnd.c:685 #7 vndioctl+0xdfc sys/dev/vnd.c:486 #8 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #9 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #10 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] fdlock (&newfdp->fd_fd.fd_lock) #0 rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 #1 unp_externalize+0x3cf sys/kern/uipc_usrreq.c:1074 #2 soreceive+0xc24 sys/kern/uipc_socket.c:1029 #3 recvit+0x40b sys/kern/uipc_syscalls.c:1078 #4 sys_recvmsg+0x1bf sys/kern/uipc_syscalls.c:878 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffd80795306b8,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd80795306a0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd80795306a0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8079533480,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd8079533480,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd806c864ad8,ffff80002a2602b0) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c864ad8,ffff80002a2602b0) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd806c864ad8,ffff80002a2602b0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 knote_drop(fffffd806b7ce008,ffff80002a2602b0) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff80002a2602b0,fffffd806f68f380,fffffd806f68f410,3,0) at knote_remove+0x215 sys/kern/kern_event.c:-1 knote_fdclose(ffff80002a2602b0,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff80002a2602b0,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:760 syscall(ffff80003abf8200) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003abf8200) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x45891828e0, count: -14 ddb{1}> show registers rdi 0 rsi 0x80000 acpi_pdirpa+0x6be71 rbp 0xffff80003abf7cc0 rbx 0 rdx 0xffff800001561ac0 rcx 0xffff80002a2602b0 rax 0x7ffff acpi_pdirpa+0x6be70 r8 0xffff80003abf7ba0 r9 0x8080808080808080 r10 0x6efec0ea1794975f r11 0x8c4caba5cea9d r12 0xfffffd8003f57d00 r13 0xfffffd8004744ac0 r14 0x3 r15 0xffffffff8341c190 substchar+0x3540 rip 0xffffffff831ea265 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003abf7cb0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=405979 pid=1223 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a261a08,0xffff8000fffe3a28 process=0xffff8000fffe5830 user=0xffff80003abf3000, vmspace=0xfffffd800bbf8208 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 91934 351589 83310 0 2 0 syz-executor 1223 360480 42395 0 2 0 syz-executor * 1223 405979 42395 0 7 0x4000000 syz-executor 70085 305751 53655 0 7 0x4000000 syz-executor 70085 57436 53655 0 3 0x4000080 rest syz-executor 60105 326613 6292 0 3 0x80 nanoslp syz-executor 60105 31529 6292 0 3 0x4000080 kqsel syz-executor 60105 60464 6292 0 3 0x4000080 fsleep syz-executor 34189 491848 68509 60929 3 0x90 nanoslp syz-executor 34189 63921 68509 60929 3 0x4000090 kqsel syz-executor 34189 513848 68509 60929 3 0x4000090 fsleep syz-executor 46457 133962 84550 0 2 0 syz-executor 46457 100994 84550 0 3 0x4000080 ttyout syz-executor 61361 509358 94641 0 2 0 syz-executor 61361 463024 94641 0 3 0x4000080 kqread syz-executor 61361 29984 94641 0 3 0x4000080 fsleep syz-executor 53655 484431 94559 0 3 0x82 nanoslp syz-executor 84550 164781 94559 0 3 0x82 nanoslp syz-executor 32483 336327 94559 0 3 0x82 wait syz-executor 83310 104545 94559 0 3 0x82 nanoslp syz-executor 94641 83782 94559 0 3 0x82 nanoslp syz-executor 68509 68547 94559 0 3 0x82 nanoslp syz-executor 42395 222522 94559 0 3 0x82 nanoslp syz-executor 6292 191626 94559 0 3 0x82 nanoslp syz-executor 94559 415763 8868 0 3 0x82 kqread syz-executor 8868 233947 64424 0 3 0x10008a sigsusp ksh 64424 419828 95778 0 3 0x98 kqread sshd-session 95778 247449 67838 0 3 0x92 kqread sshd-session 45446 222144 1 0 3 0x100083 ttyopn getty 67838 39231 1 0 3 0x88 kqread sshd 98639 411649 58191 74 3 0x1100092 bpf pflogd 58191 126097 1 0 3 0x80 sbwait pflogd 21140 430170 89963 73 3 0x1100090 kqread syslogd 89963 275845 1 0 3 0x100082 sbwait syslogd 67578 95489 1 0 3 0x100080 kqread resolvd 49759 355176 44574 77 3 0x100092 kqread dhcpleased 15884 30984 44574 77 3 0x100092 kqread dhcpleased 44574 71174 1 0 3 0x80 kqread dhcpleased 3142 21680 0 0 3 0x14200 bored smr 56340 141317 0 0 2 0x14200 zerothread 60628 235955 0 0 3 0x14200 aiodoned aiodoned 46183 85655 0 0 3 0x14200 syncer update 419 399512 0 0 3 0x14200 cleaner cleaner 37199 359401 0 0 3 0x14200 reaper reaper 92202 126831 0 0 3 0x14200 pgdaemon pagedaemon 24649 304443 0 0 3 0x14200 bored viomb 34667 424353 0 0 3 0x40014200 acpi0 acpi0 44208 194832 0 0 3 0x40014200 idle1 56901 79005 0 0 3 0x14200 bored softnet1 2773 393417 0 0 2 0x14200 softnet0 15270 175852 0 0 3 0x14200 smrbar systqmp 10987 91356 0 0 3 0x14200 bored systq 94872 426937 0 0 3 0x14200 tmoslp softclockmp 3509 264689 0 0 3 0x40014200 tmoslp softclock 80361 75408 0 0 3 0x40014200 idle0 1 381502 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 1223 (syz-executor) thread 0xffff80002a2602b0 (405979) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839333c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x41 sys/kern/vfs_vnops.c:608 #2 fdrop+0x121 sys/kern/kern_descrip.c:1280 #3 knote_drop+0x1a1 sys/kern/kern_event.c:2296 #4 knote_remove+0x215 sys/kern/kern_event.c:-1 #5 knote_fdclose+0xf9 sys/kern/kern_event.c:2203 #6 fdrelease+0xf9 sys/kern/kern_descrip.c:760 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #8 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xffff8000fffeb720) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 sys_close+0xd0 sys/kern/kern_descrip.c:778 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #4 Xsyscall+0x128 Process 15270 (systqmp) thread 0xffff8000ffffe298 (175852) shared rwlock systqmp r = 0 (0xffffffff838a1bc8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11063 12148K 12245K 166960K 12412 0 pcb 19 14K 16K 166960K 182 0 rtable 198 10K 10K 166960K 478 0 pf 34 17K 82K 166960K 85 0 ifaddr 37 6K 7K 166960K 72 0 ifgroup 47 2K 2K 166960K 101 0 sysctl 4 1K 9K 166960K 10 0 counters 66 36K 37K 166960K 126 0 ioctlops 0 0K 4K 166960K 1552 0 iov 0 0K 16K 166960K 13 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1342 84K 85K 166960K 1546 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 97K 166960K 413 0 sigio 0 0K 0K 166960K 7 0 proc 72 115K 164K 166960K 597 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 166 0 in_multi 83 5K 7K 166960K 140 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 4 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 421 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 167K 181K 166960K 5651 0 UVM aobj 14 4K 6K 166960K 15 0 pinsyscall 43 86K 107K 166960K 1571 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 10 0K 2K 166960K 46 0 temp 45 8675K 8770K 166960K 16891 0 kqueue 15 24K 28K 166960K 85 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 57 0 54 1 0 1 1 0 8 0 rtentry 176 129 0 51 6 0 6 6 0 8 0 unpcb 144 187 0 167 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpqe 32 2 0 2 1 0 1 1 0 8 1 tcpcb 736 75 0 69 1 0 1 1 0 8 0 arp 136 20 0 6 1 0 1 1 0 8 0 inpcb 328 397 0 384 8 1 7 7 0 8 5 nd6 152 27 0 9 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 ppxss 1192 22 0 22 1 0 1 1 0 8 1 pppxif 1504 2 0 2 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 8 0 3 1 0 1 1 0 8 0 pfstlim 224 1 0 1 1 1 0 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfrule 1360 2 0 0 1 0 1 1 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 592 0 210 29 0 29 29 0 8 2 art_table 40 593 0 210 5 0 5 5 0 8 0 art_node 32 129 0 55 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0 semapl 112 12 0 3 1 0 1 1 0 8 0 shmpl 112 10 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2083 0 573 96 0 96 96 0 8 1 ffsino 296 2083 0 573 117 0 117 117 0 8 0 nchpl 144 2629 0 928 64 0 64 64 0 8 0 rtmask 32 6 0 6 1 0 1 1 0 8 1 vnodes 216 2247 0 0 125 0 125 125 0 8 0 namei 1024 8828 0 8828 1 0 1 1 0 8 1 percpumem 16 78 0 30 1 0 1 1 0 8 0 vmpool 848 1 0 1 1 0 1 1 0 8 1 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 58 0 36 3 0 3 3 0 8 1 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 18499 0 18499 9 1 8 8 1 8 8 plimitpl 152 150 0 132 1 0 1 1 0 8 0 sigapl 424 721 0 673 7 1 6 7 0 8 0 knotepl 120 509 0 0 16 0 16 16 0 8 0 kqueuepl 224 148 0 134 3 1 2 3 0 8 1 pipepl 344 142 0 115 3 0 3 3 0 8 0 fdescpl 528 705 0 673 3 0 3 3 0 8 0 filepl 160 3378 0 3148 13 0 13 13 0 8 3 lockfpl 104 108 0 105 1 0 1 1 0 8 0 lockfspl 48 50 0 47 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 38 0 21 1 0 1 1 0 8 0 ucredpl 104 376 0 361 1 0 1 1 0 8 0 zombiepl 144 674 0 673 1 0 1 1 0 8 0 processpl 1232 721 0 673 5 0 5 5 0 8 1 procpl 664 1193 0 1136 6 0 6 6 0 8 1 sosppl 176 7 0 5 1 0 1 1 0 8 0 sockpl 752 659 0 623 11 1 10 10 0 8 5 mcl64k 65536 2 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 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 195 0 0 13 0 13 13 0 8 0 bufpl 280 11356 0 5220 439 0 439 439 0 8 0 anonpl 32 7554 0 0 61 0 61 61 0 246 0 amapchunkpl 152 17342 0 16836 36 0 36 36 0 158 15 amappl16 200 2465 0 2436 18 7 11 15 0 8 8 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 449 0 448 1 0 1 1 0 8 0 amappl12 168 1071 0 1029 3 0 3 3 0 8 0 amappl11 160 51 0 51 1 1 0 1 0 8 0 amappl10 152 47 0 33 1 0 1 1 0 8 0 amappl9 144 245 0 245 1 1 0 1 0 8 0 amappl8 136 61 0 59 1 0 1 1 0 8 0 amappl7 128 96 0 95 1 0 1 1 0 8 0 amappl6 120 323 0 310 1 0 1 1 0 8 0 amappl5 112 83 0 72 1 0 1 1 0 8 0 amappl4 104 432 0 401 1 0 1 1 0 8 0 amappl3 96 2842 0 2745 3 0 3 3 0 8 0 amappl2 88 834 0 759 2 0 2 2 0 8 0 amappl1 80 10538 0 9945 14 0 14 14 0 8 0 amappl 88 4856 0 4687 5 0 5 5 0 92 0 uvmvnodes 80 106 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 128 255 0 255 2 1 1 1 0 8 1 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 14 0 1 1 0 1 1 0 8 0 uaddrrnd 24 705 0 673 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 705 0 673 1 0 1 1 0 8 0 vmmpekpl 168 7516 0 7474 3 0 3 3 0 8 0 vmmpepl 168 52450 0 50493 98 0 98 98 0 357 11 vmsppl 488 704 0 673 5 0 5 5 0 8 0 rwobjpl 80 17189 0 16143 27 0 27 27 0 8 3 pdppl 4096 1419 0 1348 105 32 73 87 0 8 2 pvpl 32 14985 0 0 121 0 121 121 0 265 0 pmappl 256 705 0 674 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 278 0 34 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff83864ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff83932bc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83932bc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x77b144e54ed0, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(fffffd80795306b8,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 rw_do_enter_write(fffffd80795306a0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234 rrw_enter(fffffd80795306a0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 VOP_LOCK(fffffd8079533480,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 vn_lock(fffffd8079533480,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570 vn_closefile(fffffd806c864ad8,ffff80002a2602b0) at vn_closefile+0x111 vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c864ad8,ffff80002a2602b0) at vn_closefile+0x111 sys/kern/vfs_vnops.c:615 fdrop(fffffd806c864ad8,ffff80002a2602b0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 knote_drop(fffffd806b7ce008,ffff80002a2602b0) at knote_drop+0x1a1 sys/kern/kern_event.c:2296 knote_remove(ffff80002a2602b0,fffffd806f68f380,fffffd806f68f410,3,0) at knote_remove+0x215 sys/kern/kern_event.c:-1 knote_fdclose(ffff80002a2602b0,3) at knote_fdclose+0xf9 sys/kern/kern_event.c:2203 fdrelease(ffff80002a2602b0,3) at fdrelease+0xf9 sys/kern/kern_descrip.c:760 syscall(ffff80003abf8200) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003abf8200) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x45891828e0, count: -14