witness: lock order reversal: 1st 0xfffffd806be6a4a0 vmmaplk (&map->lock) 2nd 0xfffffd807112b2c0 inode (&ip->i_lock) lock order [1] vmmaplk (&map->lock) -> [2] inode (&ip->i_lock) #0 rw_enter+0x122 #1 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #2 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #3 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #4 vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 #5 vndstrategy+0x4ff sys/dev/vnd.c:342 #6 physio+0x2f6 sys/kern/kern_physio.c:162 #7 spec_read+0x155 sys/kern/spec_vnops.c:215 #8 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #9 vn_read+0x17b sys/kern/vfs_vnops.c:369 #10 dofilereadv+0x230 sys/kern/sys_generic.c:252 #11 sys_read+0xa2 sys/kern/sys_generic.c:172 #12 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #12 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 lock order [2] inode (&ip->i_lock) -> [1] vmmaplk (&map->lock) #0 rw_enter_read+0xab sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1819 #2 uvm_fault_check+0x49 sys/uvm/uvm_fault.c:672 #3 uvm_fault+0xf5 sys/uvm/uvm_fault.c:600 #4 kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 #5 kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x57 #8 ffs_read+0x422 sys/ufs/ffs/ffs_vnops.c:254 #9 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #10 vn_rdwr+0x15b #11 vmcmd_map_readvn+0x142 sys/kern/exec_subr.c:249 #12 exec_process_vmcmds+0xfb sys/kern/exec_subr.c:139 #13 sys_execve+0xbe4 sys/kern/kern_exec.c:468 #14 start_init+0x3c6 sys/kern/init_main.c:714 #15 proc_trampoline+0x10 Stopped at db_enter+0x25: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd807112b2c0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd807112b2b0,1) at rw_enter+0x122 rrw_enter(fffffd807112b2b0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd806b9f37a8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806b9f37a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd806b9f37a8,ffff800011a26740,48,0,1,cec68d6d7fc0b4b,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd8068785240) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff8143a5c0,2902,8000,ffffffff8153d7c0,ffff800037255748) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000372555b0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd8068eddcd8,ffff800037255748,0,fffffd807f7d31a0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bd25ad0,ffff800037255748,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000371ed1f8,3,ffff800037255748,0,ffff800037255800) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff8000371ed1f8,ffff8000372558b0,ffff800037255800) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff8000372558b0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000372558b0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x34b36253ca0, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff800037255070 rbx 0xfffffd80042c2470 rdx 0xffff80000128f700 rcx 0xffff8000371ed1f8 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff800037254f50 r9 0x8080808080808080 r10 0x66150df107833d1a r11 0xabff0d5d7b1212bd r12 0 r13 0xfffffd8003adae00 r14 0x3 r15 0xffffffff rip 0xffffffff82f37f75 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800037255060 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=275916 pid=71007 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000371ec2c8,0xffffffff83591800 process=0xffff800037240000 user=0xffff800037250000, vmspace=0xfffffd806be6a3a8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71007 22485 48020 0 3 0x80 fsleep syz-executor *71007 275916 48020 0 7 0x4000000 syz-executor 18287 440984 43506 0 3 0x80 fsleep syz-executor 18287 88915 43506 0 3 0x4000080 pipewr syz-executor 23302 51548 15040 0 3 0x80 fsleep syz-executor 23302 389792 15040 0 3 0x4000080 piperd syz-executor 57500 367996 12731 0 3 0x80 fsleep syz-executor 57500 450531 12731 0 3 0x4000080 sbwait syz-executor 26902 163973 80592 0 3 0x80 fsleep syz-executor 26902 495694 80592 0 3 0x4000080 rest syz-executor 28119 113946 71281 0 3 0x80 fsleep syz-executor 28119 503243 71281 0 3 0x4000080 ttyin syz-executor 28119 520512 71281 0 3 0x4000080 fsleep syz-executor 95199 145190 0 0 3 0x14200 acct acct 48470 79090 1 0 3 0x80 nanoslp init 25846 495098 0 0 3 0x14200 bored sosplice 30111 400319 0 0 3 0x14280 nfsidl nfsio 90952 46085 0 0 3 0x14280 nfsidl nfsio 90741 426686 0 0 3 0x14280 nfsidl nfsio 51422 169939 0 0 3 0x14280 nfsidl nfsio 8666 258568 0 0 3 0x14280 nfsidl nfsio 83233 469742 0 0 3 0x14280 nfsidl nfsio 25930 390660 0 0 3 0x14280 nfsidl nfsio 32715 82066 0 0 3 0x14280 nfsidl nfsio 34700 271421 0 0 3 0x14280 nfsidl nfsio 33911 240655 0 0 3 0x14280 nfsidl nfsio 75692 160126 0 0 3 0x14280 nfsidl nfsio 30286 479831 0 0 3 0x14280 nfsidl nfsio 76667 165927 0 0 3 0x14280 nfsidl nfsio 20387 420547 0 0 3 0x14280 nfsidl nfsio 62742 512155 0 0 3 0x14280 nfsidl nfsio 11375 1579 0 0 3 0x14280 nfsidl nfsio 60224 103047 0 0 3 0x14280 nfsidl nfsio 54214 170577 0 0 3 0x14280 nfsidl nfsio 35066 114332 0 0 3 0x14280 nfsidl nfsio 63832 442117 0 0 3 0x14280 nfsidl nfsio 42557 476235 45932 0 3 0x100082 sbwait arp 45932 199492 58133 0 3 0x10008a sigsusp sh 71281 428067 68594 0 2 0x482 syz-executor 15040 107550 68594 0 7 0x2 syz-executor 12731 331914 68594 0 2 0x482 syz-executor 43506 416338 68594 0 2 0x482 syz-executor 80592 498443 68594 0 2 0x482 syz-executor 29334 261879 68594 0 3 0x82 wait syz-executor 58133 497866 68594 0 3 0x82 wait syz-executor 48020 229176 68594 0 2 0x482 syz-executor 68594 454939 29076 0 3 0x82 kqread syz-executor 29076 406768 68116 0 3 0x10008a sigsusp ksh 68116 346126 72331 0 3 0x98 kqread sshd-session 72331 228603 20249 0 3 0x92 kqread sshd-session 20249 23723 1 0 3 0x88 kqread sshd 2179 221143 25173 74 3 0x1100092 bpf pflogd 25173 392397 1 0 3 0x80 sbwait pflogd 56298 468267 5954 73 3 0x1100090 kqread syslogd 5954 248032 1 0 3 0x100082 sbwait syslogd 18655 93882 1 0 3 0x100080 kqread resolvd 45407 343550 41103 77 3 0x100092 kqread dhcpleased 18628 346378 41103 77 3 0x100092 kqread dhcpleased 41103 345583 1 0 3 0x80 kqread dhcpleased 51248 243367 0 0 3 0x14200 bored smr 62871 244705 0 0 3 0x14200 pgzero zerothread 84899 205045 0 0 3 0x14200 aiodoned aiodoned 70080 295550 0 0 3 0x14200 syncer update 95257 9281 0 0 3 0x14200 cleaner cleaner 85721 386855 0 0 3 0x14200 reaper reaper 65543 91366 0 0 3 0x14200 pgdaemon pagedaemon 38821 266440 0 0 3 0x14200 bored viomb 36121 69460 0 0 3 0x40014200 acpi0 acpi0 72595 522868 0 0 3 0x40014200 idle1 78864 395078 0 0 3 0x14200 bored softnet3 48003 142848 0 0 3 0x14200 bored softnet2 87391 327325 0 0 3 0x14200 bored softnet1 73251 492137 0 0 3 0x14200 bored softnet0 83719 136215 0 0 3 0x14200 bored systqmp 12658 411408 0 0 3 0x14200 bored systq 61073 307161 0 0 3 0x14200 tmoslp softclockmp 46219 167264 0 0 2 0x40014200 softclock 34954 211684 0 0 3 0x40014200 idle0 1 453395 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 71007 (syz-executor) thread 0xffff8000371ed1f8 (275916) shared rwlock vmmaplk r = 0 (0xfffffd806be6a4a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 uvm_vslock_device+0x149 sys/uvm/uvm_glue.c:172 #2 physio+0x277 sys/kern/kern_physio.c:139 #3 spec_read+0x155 sys/kern/spec_vnops.c:215 #4 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #5 vn_read+0x17b sys/kern/vfs_vnops.c:369 #6 dofilereadv+0x230 sys/kern/sys_generic.c:252 #7 sys_read+0xa2 sys/kern/sys_generic.c:172 #8 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #8 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8350aba8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 vn_read+0x56 sys/kern/vfs_vnops.c:351 #2 dofilereadv+0x230 sys/kern/sys_generic.c:252 #3 sys_read+0xa2 sys/kern/sys_generic.c:172 #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10242 11216K 11609K 166960K 12956 0 pcb 17 18K 20K 166960K 396 0 rtable 157 6K 8K 166960K 461 0 pf 35 17K 273K 166960K 122 0 ifaddr 33 5K 7K 166960K 69 0 ifgroup 58 2K 2K 166960K 123 0 sysctl 3 0K 2K 166960K 4 0 counters 64 36K 36K 166960K 102 0 ioctlops 0 0K 4K 166960K 1602 0 iov 0 0K 16K 166960K 118 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1423 89K 91K 166960K 2478 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 134 0 dirhash 12 2K 2K 166960K 54 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 19 69K 97K 166960K 1310 0 sigio 0 0K 0K 166960K 17 0 proc 63 79K 152K 166960K 651 0 subproc 104 6K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 237 0 in_multi 65 4K 6K 166960K 127 0 ether_multi 1 0K 0K 166960K 7 0 mrt 2 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 572 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 73K 91K 166960K 14372 0 UVM aobj 65 3K 3K 166960K 70 0 pinsyscall 44 88K 110K 166960K 2434 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 71 0 NDP 12 0K 1K 166960K 47 0 temp 78 6828K 7081K 166960K 44705 0 kqueue 14 22K 30K 166960K 225 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 207 0 203 3 2 1 3 0 8 0 rtentry 112 128 0 61 3 0 3 3 0 8 0 unpcb 144 917 0 898 5 4 1 4 0 8 0 syncache 336 12 0 12 4 4 0 1 0 8 0 tcpcb 808 587 0 583 21 20 1 14 0 8 0 arp 120 19 0 10 1 0 1 1 0 8 0 inpcb 336 1964 0 1957 24 23 1 13 0 8 0 nd6 136 24 0 8 1 0 1 1 0 8 0 pkpcb 40 45 0 45 2 2 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 10 0 10 2 2 0 1 0 8 0 pffrag 232 8 0 1 1 0 1 1 0 482 0 pffrnode 88 8 0 1 1 0 1 1 0 8 0 pffrent 40 12 0 5 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 81 0 19 1 0 1 1 0 8 0 pfstkey 128 81 0 19 2 0 2 2 0 8 0 pfstate 376 81 0 19 7 0 7 7 0 8 0 pfrule 1344 26 0 20 2 0 2 2 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 593 0 275 29 5 24 29 0 8 0 art_table 32 597 0 275 4 0 4 4 0 8 0 art_node 16 123 0 64 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 0 1 0 1 1 0 8 0 semapl 112 129 0 119 1 0 1 1 0 8 0 shmpl 112 67 0 5 2 0 2 2 0 8 0 dirhash 1024 46 0 29 3 0 3 3 0 8 0 dino2pl 256 3774 0 2278 95 0 95 95 0 8 0 ffsino 272 3774 0 2278 101 0 101 101 0 8 0 nchpl 144 5657 0 3969 63 0 63 63 0 8 0 uvmvnodes 80 4582 0 0 94 0 94 94 0 8 0 vnodes 216 4582 0 0 255 0 255 255 0 8 0 namei 1024 20378 0 20378 2 1 1 1 0 8 1 percpumem 16 65 0 19 1 0 1 1 0 8 0 kstatmem 264 62 0 38 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 6 0 6 2 2 0 1 0 8 0 scxspl 216 16597 0 16597 11 10 1 8 1 8 1 plimitpl 152 407 0 390 1 0 1 1 0 8 0 sigapl 424 1648 0 1575 10 1 9 9 0 8 0 futexpl 64 19239 0 19232 1 0 1 1 0 8 0 knotepl 120 578 0 0 18 0 18 18 0 8 0 kqueuepl 216 412 0 402 5 4 1 5 0 8 0 pipepl 320 285 0 255 5 2 3 5 0 8 0 fdescpl 496 1605 0 1572 6 1 5 6 0 8 0 filepl 152 11545 0 11286 24 13 11 19 0 8 0 lockfpl 104 392 0 390 1 0 1 1 0 8 0 lockfspl 48 162 0 160 1 0 1 1 0 8 0 sessionpl 144 33 0 25 1 0 1 1 0 8 0 pgrppl 48 83 0 67 1 0 1 1 0 8 0 ucredpl 104 1913 0 1897 1 0 1 1 0 8 0 zombiepl 144 1576 0 1575 1 0 1 1 0 8 0 processpl 1160 1648 0 1575 6 0 6 6 0 8 0 procpl 648 3698 0 3618 9 1 8 8 0 8 0 srpgc 96 4 0 4 1 1 0 1 0 8 0 sosppl 168 4 0 4 2 2 0 1 0 8 0 sockpl 664 3145 0 3115 30 27 3 15 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 136 0 0 17 0 17 17 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 60 0 0 2 0 2 2 0 8 0 mbufpl 256 400 0 0 25 0 25 25 0 8 0 bufpl 280 4841 0 146 336 0 336 336 0 8 0 anonpl 24 294582 0 288796 82 35 47 75 0 185 0 amapchunkpl 152 48646 0 48050 35 11 24 33 0 158 0 amappl16 200 7167 0 7074 33 24 9 18 0 8 0 amappl15 192 12 0 11 1 0 1 1 0 8 0 amappl14 184 134 0 122 1 0 1 1 0 8 0 amappl13 176 22 0 21 2 1 1 1 0 8 0 amappl12 168 2264 0 2231 4 2 2 3 0 8 0 amappl11 160 60 0 46 1 0 1 1 0 8 0 amappl10 152 11 0 11 2 2 0 1 0 8 0 amappl9 144 165 0 164 1 0 1 1 0 8 0 amappl8 136 43 0 40 1 0 1 1 0 8 0 amappl7 128 115 0 103 1 0 1 1 0 8 0 amappl6 120 177 0 174 1 0 1 1 0 8 0 amappl5 112 219 0 207 1 0 1 1 0 8 0 amappl4 104 349 0 329 1 0 1 1 0 8 0 amappl3 96 8622 0 8517 3 0 3 3 0 8 0 amappl2 88 1981 0 1893 3 0 3 3 0 8 0 amappl1 80 13315 0 12744 16 2 14 15 0 8 0 amappl 88 13823 0 13636 6 1 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 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 7 0 7 2 2 0 1 0 8 0 dma128 128 256 0 256 3 3 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 69 0 5 2 0 2 2 0 8 0 uaddrrnd 24 1605 0 1572 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1605 0 1572 1 0 1 1 0 8 0 vmmpekpl 168 14819 0 14784 2 0 2 2 0 8 0 vmmpepl 168 107104 0 105112 112 20 92 104 0 357 0 vmsppl 448 1604 0 1572 6 1 5 5 0 8 0 rwobjpl 56 36846 0 31173 84 3 81 83 0 8 0 pdppl 4096 3217 0 3144 115 42 73 87 0 8 0 pvpl 32 19719 0 0 159 0 159 159 0 265 0 pmappl 248 1604 0 1572 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 460 0 102 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd807112b2c0,9,0) at witness_checkorder+0x1047 rw_enter(fffffd807112b2b0,1) at rw_enter+0x122 rrw_enter(fffffd807112b2b0,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd806b9f37a8,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806b9f37a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd806b9f37a8,ffff800011a26740,48,0,1,cec68d6d7fc0b4b,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd8068785240) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff8143a5c0,2902,8000,ffffffff8153d7c0,ffff800037255748) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000372555b0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd8068eddcd8,ffff800037255748,0,fffffd807f7d31a0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806bd25ad0,ffff800037255748,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000371ed1f8,3,ffff800037255748,0,ffff800037255800) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_read(ffff8000371ed1f8,ffff8000372558b0,ffff800037255800) at sys_read+0xa2 sys/kern/sys_generic.c:172 syscall(ffff8000372558b0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000372558b0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x34b36253ca0, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 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(ffffffff8350a9a0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8350a9a0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 syscall(ffff80002a14e060) at syscall+0xa11 mi_syscall_return sys/sys/syscall_mi.h:206 [inline] syscall(ffff80002a14e060) at syscall+0xa11 sys/arch/amd64/amd64/trap.c:598 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cc7e4cc02e0, count: -6