login: panic: kernel diagnostic assertion "len >= 0 && !M_READONLY(m)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/uipc_mbuf.c", line 1384 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *152712 75453 0 0 0x4000000 0 syz-executor.2 411042 87583 0 0 0 1 syz-executor.7 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82576625) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e9a2c,ffffffff8255f03b,568,ffffffff8258d88a) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd80688f6500,ffffffc8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e3e8880,ffff800000d12800,ffff80002e3e85e8,ffff80002e3e84e8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(31700,ffff80002e3e8880,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff80002e3e86e0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd80749d65d8,ffff80002e3e8880,1,fffffd807f7d8900) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8066f26c80,ffff80002e3e8880,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002c942000,3,ffff80002e3e8880,1,ffff80002e3e8980) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002c942000,ffff80002e3e8928,ffff80002e3e8980) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002c942000,ffff80002e3e8928,ffff80002e3e8980) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e3e89f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3e89f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x11841774310, count: 2 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: kernel diagnostic assertion "len >= 0 && !M_READONLY(m)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/uipc_mbuf.c", line 1384 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82576625) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e9a2c,ffffffff8255f03b,568,ffffffff8258d88a) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd80688f6500,ffffffc8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e3e8880,ffff800000d12800,ffff80002e3e85e8,ffff80002e3e84e8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(31700,ffff80002e3e8880,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff80002e3e86e0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd80749d65d8,ffff80002e3e8880,1,fffffd807f7d8900) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8066f26c80,ffff80002e3e8880,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002c942000,3,ffff80002e3e8880,1,ffff80002e3e8980) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002c942000,ffff80002e3e8928,ffff80002e3e8980) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002c942000,ffff80002e3e8928,ffff80002e3e8980) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e3e89f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3e89f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x11841774310, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e3e8300 rbx 0xffffffff82967bff cpu_info_full_primary+0x2bff rdx 0xffff800000da9780 rcx 0 rax 0xffff80002c942000 r8 0x101010101010101 r9 0x8080808080808080 r10 0x65a26e1c92bba14e r11 0x6bdb94e74f617eaa r12 0xffffffff82967a00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff822e6308 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e3e82f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.2) pid=152712 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff80002c943a40,0xffffffff82a00590 process=0xffff8000fffeba50 user=0xffff80002e3e3000, vmspace=0xfffffd8073234000 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 75453 77962 20840 0 2 0 syz-executor.2 *75453 152712 20840 0 7 0x4000000 syz-executor.2 92126 186200 47924 0 2 0 syz-executor.1 92126 453160 47924 0 2 0x4000000 syz-executor.1 87583 411042 17832 0 7 0 syz-executor.7 87583 487919 17832 0 3 0x4000080 fsleep syz-executor.7 87583 208253 17832 0 3 0x4000080 nanoslp syz-executor.7 17832 209634 13020 0 3 0x82 nanoslp syz-executor.7 89798 358262 1 0 3 0x100083 ttyin getty 29307 36526 13020 0 3 0x82 piperd syz-executor.5 20840 486733 13020 0 2 0x2 syz-executor.2 4675 118411 13020 0 3 0x82 piperd syz-executor.0 86110 472116 13020 0 3 0x82 piperd syz-executor.6 45682 341927 13020 0 3 0x82 piperd syz-executor.3 71764 247399 13020 0 2 0x2 syz-executor.4 47924 270349 13020 0 3 0x82 nanoslp syz-executor.1 50421 70540 0 0 3 0x14200 acct acct 64400 151910 0 0 3 0x14280 nfsidl nfsio 17061 17401 0 0 3 0x14280 nfsidl nfsio 54258 125790 0 0 3 0x14280 nfsidl nfsio 51610 398093 0 0 3 0x14280 nfsidl nfsio 20702 494419 0 0 3 0x14280 nfsidl nfsio 57176 28587 0 0 3 0x14280 nfsidl nfsio 99966 292883 0 0 3 0x14280 nfsidl nfsio 16854 195842 0 0 3 0x14280 nfsidl nfsio 69418 171021 0 0 3 0x14280 nfsidl nfsio 19411 137732 0 0 3 0x14280 nfsidl nfsio 76614 369711 0 0 3 0x14280 nfsidl nfsio 72652 389525 0 0 3 0x14280 nfsidl nfsio 95158 412762 0 0 3 0x14280 nfsidl nfsio 91744 441088 0 0 3 0x14280 nfsidl nfsio 17820 362773 0 0 3 0x14280 nfsidl nfsio 24904 196980 0 0 3 0x14280 nfsidl nfsio 22931 78396 0 0 3 0x14280 nfsidl nfsio 28259 357498 0 0 3 0x14280 nfsidl nfsio 95219 277166 0 0 3 0x14280 nfsidl nfsio 84826 370790 0 0 3 0x14280 nfsidl nfsio 13131 207655 0 0 3 0x14200 bored sosplice 13020 261450 55573 0 3 0x82 kqread syz-fuzzer 13020 411873 55573 0 3 0x4000082 thrsleep syz-fuzzer 13020 1218 55573 0 3 0x4000082 thrsleep syz-fuzzer 13020 404850 55573 0 3 0x4000082 thrsleep syz-fuzzer 13020 234821 55573 0 3 0x4000082 thrsleep syz-fuzzer 13020 414988 55573 0 3 0x4000082 thrsleep syz-fuzzer 13020 91143 55573 0 3 0x4000082 thrsleep syz-fuzzer 13020 158159 55573 0 3 0x4000082 thrsleep syz-fuzzer 13020 509640 55573 0 3 0x4000082 thrsleep syz-fuzzer 55573 302344 96901 0 3 0x10008a sigsusp ksh 96901 237834 75141 0 3 0x9a kqread sshd 75141 32515 1 0 3 0x88 kqread sshd 7753 96346 20330 74 3 0x100092 bpf pflogd 20330 112928 1 0 3 0x80 netio pflogd 98290 342977 38010 73 3 0x100090 kqread syslogd 38010 281391 1 0 3 0x100082 netio syslogd 44133 302943 1 0 3 0x100080 kqread resolvd 33071 174312 23983 77 3 0x100092 kqread dhcpleased 53073 410065 23983 77 3 0x100092 kqread dhcpleased 23983 46624 1 0 3 0x80 kqread dhcpleased 40492 409318 0 0 3 0x14200 bored smr 9584 109251 0 0 2 0x14200 zerothread 62287 59893 0 0 3 0x14200 aiodoned aiodoned 46506 218186 0 0 3 0x14200 syncer update 87639 355204 0 0 3 0x14200 cleaner cleaner 95412 376540 0 0 3 0x14200 reaper reaper 33878 347542 0 0 3 0x14200 pgdaemon pagedaemon 70944 51009 0 0 3 0x14200 bored viomb 15826 126541 0 0 3 0x40014200 acpi0 acpi0 40626 146510 0 0 3 0x40014200 idle1 26300 73942 0 0 3 0x14200 bored softnet 17474 58490 0 0 3 0x14200 bored systqmp 32682 248264 0 0 3 0x14200 bored systq 66938 23680 0 0 2 0x40014200 softclock 80062 314273 0 0 3 0x40014200 idle0 1 104470 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 75453 (syz-executor.2) thread 0xffff80002c942000 (152712) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829c5fa0) #0 witness_lock+0x44d #1 vn_write+0x42 sys/kern/vfs_vnops.c:399 #2 dofilewritev+0x19c sys/kern/sys_generic.c:381 #3 sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] #3 sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 #4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10222 6574K 7465K 78643K 40068 0 pcb 13 20K 25K 78643K 2133 0 rtable 294 26K 27K 78643K 4084 0 ifaddr 102 24K 26K 78643K 4213 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 36K 78643K 340 0 ioctlops 0 0K 8K 78643K 6380 0 iov 0 0K 28K 78643K 1212 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1612 101K 101K 78643K 11381 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 119 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 2954 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 89K 78643K 14636 0 sigio 2 0K 0K 78643K 822 0 proc 71 87K 112K 78643K 2547 0 subproc 104 6K 10K 78643K 909 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 579 0 in_multi 99 6K 6K 78643K 1054 0 ether_multi 1 0K 0K 78643K 160 0 mrt 1 0K 0K 78643K 99 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 241 1076K 1076K 78643K 241 0 exec 0 0K 2K 78643K 3029 0 pfkey data 0 0K 0K 78643K 6 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 7 26K 26K 78643K 7 0 UVM amap 556 989K 991K 78643K 186694 0 UVM aobj 131 4K 4K 78643K 132 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 571 0 NDP 13 0K 1K 78643K 282 0 temp 157 4749K 8845K 78643K 127648 0 kqueue 12 18K 28K 78643K 668 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 1288 0 1285 19 18 1 3 0 8 0 rtentry 112 831 0 720 5 1 4 4 0 8 0 unpcb 136 42987 0 42972 134 125 9 14 0 8 8 syncache 296 40 0 40 12 12 0 1 0 8 0 tcpqe 32 50 0 50 7 7 0 1 0 8 0 tcpcb 736 4412 0 4406 126 124 2 14 0 8 1 arp 120 137 0 117 1 0 1 1 0 8 0 inpcb 304 12417 0 12410 135 131 4 14 0 8 3 rttmr 72 24 0 24 8 8 0 1 0 8 0 nd6 48 210 0 183 1 0 1 1 0 8 0 pkpcb 40 370 0 370 9 9 0 2 0 8 0 kcovpl 48 59 0 51 1 0 1 1 0 8 0 ppxss 1248 56 0 56 11 11 0 1 0 8 0 pfstscr 40 98 0 98 8 8 0 1 0 8 0 pffrag 232 81 0 81 3 3 0 1 0 482 0 pffrnode 88 81 0 81 3 3 0 1 0 8 0 pffrent 40 305 0 305 3 3 0 1 0 8 0 pfosfp 40 1449 0 1021 5 0 5 5 0 8 0 pfosfpen 112 1449 0 722 21 0 21 21 0 8 0 pfrke_plain 168 5 0 5 1 1 0 1 0 8 0 pfrktable 1344 585 0 565 10 8 2 2 0 8 0 pftag 88 59 0 48 2 1 1 1 0 8 0 pfstitem 24 106 0 104 1 0 1 1 0 8 0 pfstkey 112 297 0 295 2 1 1 2 0 8 0 pfstate 320 201 0 199 4 3 1 4 0 8 0 pfrule 1360 1675 0 1561 11 1 10 10 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3503 0 3029 47 16 31 36 0 8 0 art_table 32 3504 0 3029 6 1 5 5 0 8 0 art_node 16 827 0 731 1 0 1 1 0 8 0 sysvmsgpl 40 33 0 21 1 0 1 1 0 8 0 semapl 112 2951 0 2941 1 0 1 1 0 8 0 shmpl 112 129 0 1 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 19946 0 18480 93 1 92 92 0 8 0 ffsino 272 19946 0 18480 98 0 98 98 0 8 0 nchpl 144 38485 0 36863 63 0 63 63 0 8 0 rtmask 32 6 0 6 1 1 0 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 139995 0 139995 8 7 1 2 0 8 1 percpumem 16 182 0 142 1 0 1 1 0 8 0 vcpupl 2048 196 0 0 25 0 25 25 0 8 0 vmpool 560 218 0 22 14 0 14 14 0 8 0 pfiaddrpl 120 776 0 733 5 3 2 2 0 8 0 scsiplug 72 8 0 8 3 3 0 1 0 8 0 scxspl 216 114481 0 114481 32 31 1 8 0 8 1 plimitpl 152 1382 0 1367 1 0 1 1 0 8 0 sigapl 424 14875 0 14813 8 0 8 8 0 8 0 futexpl 64 127813 0 127812 2 1 1 1 0 8 0 knotepl 120 262 0 0 7 1 6 6 0 8 0 kqueuepl 216 2859 0 2850 59 58 1 8 0 8 0 pipepl 336 2972 0 2944 67 64 3 8 0 8 0 fdescpl 496 14839 0 14813 5 1 4 5 0 8 0 filepl 152 124071 0 123830 170 152 18 27 0 8 8 lockfpl 104 3896 0 3894 7 6 1 2 0 8 0 lockfspl 48 1135 0 1133 1 0 1 1 0 8 0 sessionpl 144 80 0 63 1 0 1 1 0 8 0 pgrppl 48 166 0 149 1 0 1 1 0 8 0 ucredpl 96 11633 0 11621 1 0 1 1 0 8 0 zombiepl 144 14813 0 14813 1 0 1 1 0 8 1 processpl 1064 14875 0 14813 5 0 5 5 0 8 0 procpl 672 42986 0 42912 25 16 9 9 0 8 1 srpgc 96 68 0 68 9 9 0 1 0 8 0 sosppl 168 112 0 112 14 13 1 1 0 8 1 sockpl 480 57071 0 57046 1330 1313 17 59 0 8 13 mcl64k 65536 21 0 0 3 0 3 3 0 8 0 mcl16k 16384 33 0 0 5 2 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 30 0 0 2 0 2 2 0 8 0 mcl8k 8192 57 0 0 5 2 3 3 0 8 0 mcl4k 4096 26 0 0 4 1 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 323 0 0 19 1 18 19 0 8 0 mtagpl 96 1115 0 0 22 0 22 22 0 8 0 mbufpl 256 3890 0 0 241 0 241 241 0 8 0 bufpl 288 26453 0 20117 453 0 453 453 0 8 0 anonpl 24 4229528 0 4210003 297 157 140 159 0 186 0 amapchunkpl 152 449421 0 448584 103 64 39 50 0 158 1 amappl16 200 42250 0 41562 185 144 41 49 0 8 0 amappl15 192 1012 0 1006 1 0 1 1 0 8 0 amappl14 184 1650 0 1643 1 0 1 1 0 8 0 amappl13 176 3856 0 3850 1 0 1 1 0 8 0 amappl12 168 2193 0 2188 1 0 1 1 0 8 0 amappl11 160 2220 0 2204 1 0 1 1 0 8 0 amappl10 152 1893 0 1886 1 0 1 1 0 8 0 amappl9 144 2033 0 2030 1 0 1 1 0 8 0 amappl8 136 2485 0 2345 5 0 5 5 0 8 0 amappl7 128 948 0 932 1 0 1 1 0 8 0 amappl6 120 1947 0 1920 2 1 1 2 0 8 0 amappl5 112 11917 0 11901 1 0 1 1 0 8 0 amappl4 104 6144 0 6113 2 1 1 2 0 8 0 amappl3 96 4703 0 4686 1 0 1 1 0 8 0 amappl2 88 6730 0 6665 3 1 2 3 0 8 0 amappl1 80 269921 0 269372 19 5 14 19 0 8 0 amappl 88 184988 0 184672 9 0 9 9 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 72 131 0 1 3 0 3 3 0 8 0 uaddrrnd 24 15057 0 14835 2 0 2 2 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 15057 0 14835 2 0 2 2 0 8 0 vmmpekpl 168 109570 0 109489 6 1 5 5 0 8 0 vmmpepl 168 1374235 0 1371338 300 145 155 159 0 357 8 vmsppl 368 15056 0 14835 22 1 21 21 0 8 0 rwobjpl 56 333528 0 325653 124 9 115 115 0 8 0 pdppl 4096 30121 0 29866 639 374 265 265 0 8 10 pvpl 32 7024215 0 7001447 506 286 220 278 0 265 0 pmappl 248 15056 0 14835 16 1 15 15 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1873 0 596 37 0 37 37 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff82576625) at panic+0x177 sys/kern/subr_prf.c:202 __assert(ffffffff825e9a2c,ffffffff8255f03b,568,ffffffff8258d88a) at __assert+0x25 sys/kern/subr_prf.c:161 m_align(fffffd80688f6500,ffffffc8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385 bpf_movein(ffff80002e3e8880,ffff800000d12800,ffff80002e3e85e8,ffff80002e3e84e8) at bpf_movein+0x25e sys/net/bpf.c:228 bpfwrite(31700,ffff80002e3e8880,1) at bpfwrite+0x169 sys/net/bpf.c:644 spec_write(ffff80002e3e86e0) at spec_write+0xd4 sys/kern/spec_vnops.c:309 VOP_WRITE(fffffd80749d65d8,ffff80002e3e8880,1,fffffd807f7d8900) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd8066f26c80,ffff80002e3e8880,1) at vn_write+0x1a1 sys/kern/vfs_vnops.c:414 dofilewritev(ffff80002c942000,3,ffff80002e3e8880,1,ffff80002e3e8980) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_pad_pwrite(ffff80002c942000,ffff80002e3e8928,ffff80002e3e8980) at sys_pad_pwrite+0x92 sys_pwrite sys/kern/vfs_syscalls.c:3354 [inline] sys_pad_pwrite(ffff80002c942000,ffff80002e3e8928,ffff80002e3e8980) at sys_pad_pwrite+0x92 sys/kern/vfs_syscalls.c:3426 syscall(ffff80002e3e89f0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3e89f0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x11841774310, count: -13 ddb{0}> machine ddbcpu 1