witness: lock order reversal: 1st 0xffff800001bc64e8 vmmaplk (&map->lock) 2nd 0xffff800001cfd5a8 inode (&ip->i_lock) lock order [1] vmmaplk (&map->lock) -> [2] inode (&ip->i_lock) #0 rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 #1 rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 #2 VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 #3 vn_lock+0xca sys/kern/vfs_vnops.c:576 #4 vn_rdwr+0x138 sys/kern/vfs_vnops.c:326 #5 vndstrategy+0x8e4 sys/dev/vnd.c:342 #6 physio+0x581 sys/kern/kern_physio.c:162 #7 spec_read+0x29a sys/kern/spec_vnops.c:215 #8 VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 #9 vn_read+0x1fc sys/kern/vfs_vnops.c:375 #10 dofilereadv+0x386 sys/kern/sys_generic.c:252 #11 sys_readv+0x168 sys/kern/sys_generic.c:199 #12 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #13 Xsyscall+0x128 lock order [2] inode (&ip->i_lock) -> [1] vmmaplk (&map->lock) #0 rw_do_enter_read+0x8b sys/kern/kern_rwlock.c:355 #1 uvmfault_lookup+0x1a2 sys/uvm/uvm_fault.c:-1 #2 uvm_fault_check+0x43 sys/uvm/uvm_fault.c:693 #3 uvm_fault+0x1e7 sys/uvm/uvm_fault.c:627 #4 kpageflttrap+0x41e sys/arch/amd64/amd64/trap.c:285 #5 kerntrap+0x1b6 sys/arch/amd64/amd64/trap.c:532 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x59 #8 ffs_read+0x701 sys/ufs/ffs/ffs_vnops.c:254 #9 VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 #10 vn_rdwr+0x1bc sys/kern/vfs_vnops.c:-1 #11 vmcmd_map_readvn+0x20a sys/kern/exec_subr.c:250 #12 exec_process_vmcmds+0x164 sys/kern/exec_subr.c:139 #13 sys_execve+0x1354 sys/kern/kern_exec.c:540 #14 start_init+0x5fb sys/kern/init_main.c:732 #15 proc_trampoline+0x10 Stopped at db_enter+0x17: popq %rbp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> show kasan kasan: no report recorded this boot ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 witness_checkorder(ffff800001cfd5a8,9,0) at witness_checkorder+0x19db sys/kern/subr_witness.c:-1 rw_do_enter_write(ffff800001cfd590,1) at rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 rrw_enter(ffff800001cfd590,1) at rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 VOP_LOCK(ffff800001d00b38,2001) at VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 vn_lock(ffff800001d00b38,2001) at vn_lock+0xca sys/kern/vfs_vnops.c:576 vn_rdwr(0,ffff800001d00b38,ffff800011b06240,1004,0,1,ffff800000d9c5b8,ffff800001ac3990,ffff800001ac3a00,ffffffff84f6eff0) at vn_rdwr+0x138 sys/kern/vfs_vnops.c:326 vndstrategy(ffff800001ac3990) at vndstrategy+0x8e4 sys/dev/vnd.c:342 physio(ffffffff83c7e780,2902,8000,ffffffff833ec6c0,ffff80002ab84800) at physio+0x581 sys/kern/kern_physio.c:162 spec_read(ffff80002ab84540) at spec_read+0x29a sys/kern/spec_vnops.c:215 VOP_READ(ffff80000196e6c8,ffff80002ab84800,0,ffff800000119478) at VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 vn_read(ffff800001be6900,ffff80002ab84800,0) at vn_read+0x1fc sys/kern/vfs_vnops.c:375 dofilereadv(ffff800045ff7a10,4,ffff80002ab84800,0,ffff80002ab849c0) at dofilereadv+0x386 sys/kern/sys_generic.c:252 sys_readv(ffff800045ff7a10,ffff80002ab84a60,ffff80002ab849c0) at sys_readv+0x168 sys/kern/sys_generic.c:199 syscall(ffff80002ab84a60) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ab84a60) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1d4938f3e40, count: -16 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002ab83c40 rbx 0xffffffff84991460 .str.41 rdx 0xffff800000141180 rcx 0x7ffff acpi_pdirpa+0x6be70 rax 0xffff80002d6b9000 r8 0xffff80002ab83a20 r9 0xffff80002ab839c0 r10 0x1004 __ALIGN_SIZE+0x4 r11 0xffffffff821db0c0 x86_bus_space_io_read_1 r12 0xffffffff84a296e0 ffs_vget.__lock_type r13 0xffff800001bc64e8 r14 0x3 r15 0xffffffff84a29720 .str.13 rip 0xffffffff8107c237 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80002ab83c40 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=382964 pid=53293 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=0xffff800045ff74e0,0xffff800045ff62c8 process=0xffff8000372f1380 user=0xffff80002ab79000, vmspace=0xffff800001bc63e8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 53293 64143 69744 0 2 0 0 syz-executor *53293 382964 69744 0 7 0 0x4000000 syz-executor 11562 450404 38258 0 2 0 0 syz-executor 11562 399389 38258 0 3 0 0x4000080 fsleep syz-executor 11562 48553 38258 0 3 0 0x4000080 fsleep syz-executor 11562 240503 38258 0 7 0 0x4000000 syz-executor 17099 428478 75266 0 2 0x40 0 syz-executor 14045 341 83961 0 2 0 0 syz-executor 14045 415908 83961 0 3 0 0x4000080 fsleep syz-executor 92284 230006 14523 0 2 0x10 0 syz-executor 92284 171664 14523 0 3 0x10 0x4000080 netacc syz-executor 92284 281988 14523 0 2 0x10 0x4000000 syz-executor 75266 202419 11556 0 3 0x82 0 ppwait syz-executor 21892 506862 79946 0 3 0 0x80 nanoslp syz-executor 21892 103616 79946 0 3 0 0x4000088 kqsel syz-executor 21892 184789 79946 0 3 0 0x4000080 fsleep syz-executor 36680 387331 65208 0 3 0 0x80 nanoslp syz-executor 36680 318911 65208 0 3 0 0x4000080 nanoslp syz-executor 36680 109278 65208 0 3 0 0x4000080 fsleep syz-executor 36680 80324 65208 0 3 0 0x4000080 fsleep syz-executor 83961 98933 11556 0 3 0x2 0x80 nanoslp syz-executor 79946 508496 11556 0 3 0x2 0x80 nanoslp syz-executor 65208 221294 11556 0 3 0x2 0x80 nanoslp syz-executor 38258 343934 11556 0 3 0x2 0x80 nanoslp syz-executor 14523 125547 11556 0 3 0x2 0x80 nanoslp syz-executor 69744 61163 11556 0 3 0x2 0x80 nanoslp syz-executor 11556 166080 85028 0 3 0x2 0x80 wait syz-executor 85028 409844 92655 0 3 0x100002 0x88 sigsusp ksh 92655 381489 36023 0 3 0x10 0x88 kqread sshd-session 36023 196859 7605 0 3 0x12 0x80 kqread sshd-session 62175 468288 1 0 3 0x100003 0x80 ttyin getty 7605 489960 1 0 3 0 0x88 kqread sshd 51402 106857 11078 74 3 0x1100012 0x80 bpf pflogd 11078 335065 1 0 3 0 0x80 sbwait pflogd 81457 429672 73992 73 2 0x1100010 0 syslogd 73992 438193 1 0 3 0x100002 0x80 sbwait syslogd 46268 456647 1 0 3 0x100000 0x80 kqread resolvd 97024 309276 35729 77 3 0x100012 0x80 kqread dhcpleased 75054 407692 35729 77 3 0x100012 0x80 kqread dhcpleased 35729 430696 1 0 3 0 0x80 kqread dhcpleased 12931 164294 0 0 2 0x14000 0x40000200 smr 42110 458346 0 0 2 0x14000 0x200 zerothread 88909 337333 0 0 3 0x14000 0x200 aiodoned aiodoned 33046 163673 0 0 3 0x14000 0x200 syncer update 63330 54746 0 0 3 0x14000 0x200 cleaner cleaner 14903 117587 0 0 3 0x14000 0x200 reaper reaper 39043 101505 0 0 3 0x14000 0x200 pgdaemon pagedaemon 89210 375062 0 0 3 0x14000 0x200 bored viomb 33267 251698 0 0 3 0x14000 0x40000200 acpi0 acpi0 84179 501930 0 0 3 0x14000 0x40000200 idle1 48062 481394 0 0 3 0x14000 0x200 bored softnet1 40412 447665 0 0 3 0x14000 0x200 bored softnet0 63444 481322 0 0 3 0x14000 0x200 smrbar systqmp 14580 17009 0 0 3 0x14000 0x200 bored systq 80609 477845 0 0 3 0x14000 0x200 tmoslp softclockmp 79914 96611 0 0 3 0x14000 0x40000200 tmoslp softclock 9059 220873 0 0 3 0x14000 0x40000200 idle0 1 333099 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 53293 (syz-executor) thread 0xffff800045ff7a10 (382964) shared rwlock vmmaplk r = 0 (0xffff800001bc64e8) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x55d sys/kern/kern_rwlock.c:413 #2 uvm_vslock_device+0x1bc sys/uvm/uvm_glue.c:173 #3 physio+0x4a7 sys/kern/kern_physio.c:139 #4 spec_read+0x29a sys/kern/spec_vnops.c:215 #5 VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 #6 vn_read+0x1fc sys/kern/vfs_vnops.c:375 #7 dofilereadv+0x386 sys/kern/sys_generic.c:252 #8 sys_readv+0x168 sys/kern/sys_generic.c:199 #9 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #10 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85609240) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 vn_read+0x83 sys/kern/vfs_vnops.c:357 #2 dofilereadv+0x386 sys/kern/sys_generic.c:252 #3 sys_readv+0x168 sys/kern/sys_generic.c:199 #4 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #5 Xsyscall+0x128 Process 63444 (systqmp) thread 0xffff800045ffe298 (481322) shared rwlock systqmp r = 0 (0xffffffff84f4ea98) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x1ba sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11059 12245K 12394K 166960K 12389 0 pcb 18 24K 24K 166960K 36 0 rtable 251 20K 29K 166960K 951 0 pf 35 22K 80K 166960K 96 0 ifaddr 45 13K 16K 166960K 130 0 ifgroup 55 2K 2K 166960K 137 0 sysctl 4 1K 13K 166960K 9 0 counters 70 42K 44K 166960K 112 0 ioctlops 4 2K 185K 166960K 1537 0 iov 1 0K 16K 166960K 12 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1461 94K 95K 166960K 1752 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 10K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 1K 166960K 11 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 413K 166960K 11964 0 file desc 23 70K 121K 166960K 584 0 sigio 0 0K 0K 166960K 1 0 proc 137 131K 181K 166960K 1125 0 subproc 81 10K 14K 166960K 261 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 4 0 in_multi 99 7K 8K 166960K 319 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 10 0 ISOFS mount 1 36K 36K 166960K 1 0 MSDOSFS mount 1 20K 20K 166960K 1 0 ttys 49 344K 344K 166960K 49 0 exec 37 9K 17K 166960K 660 0 fusefs mount 1 36K 36K 166960K 1 0 tdb 3 1K 1K 166960K 3 0 VM swap 14 124K 124K 166960K 15 0 UVM amap 574 320K 358K 166960K 6273 0 UVM aobj 12 4K 4K 166960K 14 0 pinsyscall 168 292K 381K 166960K 2300 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 5 0 NDP 18 0K 2K 166960K 89 0 temp 346 9363K 9470K 166960K 7108 0 kqueue 21 62K 84K 166960K 61 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 79 0 76 1 0 1 1 0 8 0 rtentry 176 332 0 233 6 0 6 6 0 8 0 unpcb 144 137 0 117 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 17 0 12 1 0 1 1 0 8 0 arp 136 58 0 42 1 0 1 1 0 8 0 inpcb 328 291 0 281 7 0 7 7 0 8 6 nd6 152 85 0 64 1 0 1 1 0 8 0 pkpcb 40 2 0 2 2 1 1 1 0 8 1 kcovpl 48 29 0 21 1 0 1 1 0 8 0 ppxss 1192 1 0 1 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 2 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 pfstitem 24 42 0 0 1 0 1 1 0 8 0 pfstkey 128 42 0 0 2 0 2 2 0 8 0 pfstate 448 42 0 0 5 0 5 5 0 8 0 pfrule 1360 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1340 0 926 32 0 32 32 0 8 5 art_table 40 1341 0 926 6 0 6 6 0 8 0 art_node 32 332 0 232 1 0 1 1 0 8 0 semupl 112 33 0 33 1 1 0 1 0 8 0 semapl 72 8 0 0 1 0 1 1 0 8 0 shmpl 120 11 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1829 0 309 95 0 95 95 0 8 0 ffsino 296 1829 0 309 117 0 117 117 0 8 0 nchpl 144 2246 0 467 66 0 66 66 0 8 0 vnodes 216 2278 0 0 127 0 127 127 0 8 0 namei 1024 10205 0 10205 3 2 1 2 0 8 1 percpumem 16 72 0 22 1 0 1 1 0 8 0 kstatmem 264 69 0 44 2 0 2 2 0 8 0 scxspl 216 8356 0 8356 4 3 1 2 1 8 1 plimitpl 152 60 0 41 1 0 1 1 0 8 0 sigapl 424 871 0 824 7 1 6 7 0 8 0 knotepl 120 449 0 0 14 0 14 14 0 8 0 kqueuepl 224 84 0 74 1 0 1 1 0 8 0 pipepl 344 210 0 183 3 0 3 3 0 8 0 fdescpl 528 855 0 824 3 0 3 3 0 8 0 filepl 160 3275 0 3054 15 0 15 15 0 8 4 lockfpl 104 62 0 59 1 0 1 1 0 8 0 lockfspl 48 24 0 21 1 0 1 1 0 8 0 sessionpl 144 53 0 44 1 0 1 1 0 8 0 pgrppl 48 83 0 66 1 0 1 1 0 8 0 ucredpl 104 233 0 218 1 0 1 1 0 8 0 zombiepl 144 825 0 824 1 0 1 1 0 8 0 processpl 1240 871 0 824 5 0 5 5 0 8 1 procpl 664 1184 0 1125 6 0 6 6 0 8 0 sockpl 752 515 0 482 11 0 11 11 0 8 7 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 16 0 16 16 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mextrefs 64 26 0 0 1 0 1 1 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 276 0 0 18 0 18 18 0 8 0 bufpl 272 2731 0 106 175 0 175 175 0 8 0 anonpl 32 4273 0 0 35 0 35 35 0 222 0 amapchunkpl 152 17358 0 16676 27 0 27 27 0 158 0 amappl16 200 2228 0 2208 8 3 5 5 0 8 2 amappl15 192 9 0 8 1 0 1 1 0 8 0 amappl14 184 681 0 680 1 0 1 1 0 8 0 amappl13 176 167 0 155 1 0 1 1 0 8 0 amappl12 168 1275 0 1246 2 0 2 2 0 8 0 amappl11 160 12 0 12 1 1 0 1 0 8 0 amappl10 152 65 0 51 1 0 1 1 0 8 0 amappl9 144 284 0 284 1 1 0 1 0 8 0 amappl8 136 183 0 181 1 0 1 1 0 8 0 amappl7 128 196 0 183 1 0 1 1 0 8 0 amappl6 120 357 0 355 1 0 1 1 0 8 0 amappl5 112 117 0 107 1 0 1 1 0 8 0 amappl4 104 364 0 345 1 0 1 1 0 8 0 amappl3 96 3175 0 3078 3 0 3 3 0 8 0 amappl2 88 927 0 851 2 0 2 2 0 8 0 amappl1 80 13856 0 13257 15 0 15 15 0 8 2 amappl 88 5148 0 4982 5 0 5 5 0 92 0 uvmvnodes 80 107 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 128 253 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 13 0 2 1 0 1 1 0 8 0 uaddrrnd 24 855 0 824 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 855 0 824 1 0 1 1 0 8 0 vmmpekpl 168 8994 0 8955 3 0 3 3 0 8 0 vmmpepl 168 64280 0 62381 89 2 87 89 0 357 3 vmsppl 488 854 0 824 5 0 5 5 0 8 0 rwobjpl 80 21282 0 20243 25 1 24 25 0 8 0 pdppl 4096 1719 0 1648 109 38 71 87 0 8 0 pvpl 32 11160 0 0 91 1 90 90 0 265 0 pmappl 256 854 0 824 3 0 3 3 0 8 0 extentpl 40 47 0 29 1 0 1 1 0 8 0 phpool 120 473 0 44 14 0 14 14 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457 witness_checkorder(ffff800001cfd5a8,9,0) at witness_checkorder+0x19db sys/kern/subr_witness.c:-1 rw_do_enter_write(ffff800001cfd590,1) at rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 rrw_enter(ffff800001cfd590,1) at rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 VOP_LOCK(ffff800001d00b38,2001) at VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 vn_lock(ffff800001d00b38,2001) at vn_lock+0xca sys/kern/vfs_vnops.c:576 vn_rdwr(0,ffff800001d00b38,ffff800011b06240,1004,0,1,ffff800000d9c5b8,ffff800001ac3990,ffff800001ac3a00,ffffffff84f6eff0) at vn_rdwr+0x138 sys/kern/vfs_vnops.c:326 vndstrategy(ffff800001ac3990) at vndstrategy+0x8e4 sys/dev/vnd.c:342 physio(ffffffff83c7e780,2902,8000,ffffffff833ec6c0,ffff80002ab84800) at physio+0x581 sys/kern/kern_physio.c:162 spec_read(ffff80002ab84540) at spec_read+0x29a sys/kern/spec_vnops.c:215 VOP_READ(ffff80000196e6c8,ffff80002ab84800,0,ffff800000119478) at VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 vn_read(ffff800001be6900,ffff80002ab84800,0) at vn_read+0x1fc sys/kern/vfs_vnops.c:375 dofilereadv(ffff800045ff7a10,4,ffff80002ab84800,0,ffff80002ab849c0) at dofilereadv+0x386 sys/kern/sys_generic.c:252 sys_readv(ffff800045ff7a10,ffff80002ab84a60,ffff80002ab849c0) at sys_readv+0x168 sys/kern/sys_generic.c:199 syscall(ffff80002ab84a60) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ab84a60) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1d4938f3e40, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave ddb{1}> trace x86_ipi_db(ffff800028fd3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412 x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff85608a40) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85608a40) at __mp_lock+0x272 sys/kern/kern_lock.c:173 end trace frame: 0x0, count: -4