witness: lock order reversal: 1st 0xfffffd806b2f9f20 vmmaplk (&map->lock) 2nd 0xfffffd80679c6b48 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_readv+0xd8 sys/kern/sys_generic.c:199 #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(fffffd80679c6b48,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80679c6b38,1) at rw_enter+0x122 rrw_enter(fffffd80679c6b38,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805ff90e58,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805ff90e58,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd805ff90e58,ffff800011a26080,1f,0,1,ebeddb4479f8bba4,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd80686cc258) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff815ff3a0,2902,8000,ffffffff8290c0d0,ffff8000371ef2c0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000371ef0b0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd807e207eb8,ffff8000371ef2c0,0,fffffd807f7d34e0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806088bd20,ffff8000371ef2c0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000371cb990,6,ffff8000371ef2c0,0,ffff8000371ef380) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000371cb990,ffff8000371ef430,ffff8000371ef380) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff8000371ef430) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371ef430) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd14461ac1e0, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff8000371eeb70 rbx 0xfffffd80042c7460 rdx 0xffff8000012aed80 rcx 0xffff8000371cb990 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff8000371eea50 r9 0x8080808080808080 r10 0xb49a913b986747f7 r11 0x4bae651e740340c r12 0 r13 0xfffffd8003adee00 r14 0x3 r15 0xffffffff rip 0xffffffff829b8bf5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000371eeb60 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=8621 pid=82795 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=0xffff8000371cace8,0xffffffff835e5be0 process=0xffff80003725cd98 user=0xffff8000371ea000, vmspace=0xfffffd806b2f9e28 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82795 268191 15533 0 2 0 syz-executor *82795 8621 15533 0 7 0x4000000 syz-executor 16183 294100 78368 0 2 0 syz-executor 16183 76462 78368 0 3 0x4000080 fsleep syz-executor 50387 469847 94793 0 2 0 syz-executor 50387 217381 94793 0 3 0x4000080 fsleep syz-executor 50387 503846 94793 0 3 0x4000080 fsleep syz-executor 14421 406853 12629 0 2 0 syz-executor 14421 229633 12629 0 3 0x4000080 kqsel syz-executor 75221 518159 84466 0 2 0 syz-executor 75221 57533 84466 0 3 0x4000080 kqpoll syz-executor 81692 200679 67720 0 3 0x90 nanoslp syz-executor 81692 369126 67720 0 3 0x4000090 kqread syz-executor 81692 456000 67720 0 3 0x4000090 fsleep syz-executor 42962 79823 29324 0 3 0x82 netio sshd-session 48439 465276 1 0 3 0x100083 ttyin getty 65914 356404 0 0 3 0x14200 bored sosplice 15533 171178 66803 0 3 0x82 nanoslp syz-executor 94793 188038 66803 0 3 0x82 nanoslp syz-executor 78368 414062 66803 0 3 0x82 nanoslp syz-executor 84466 510922 66803 0 3 0x82 nanoslp syz-executor 84500 395900 66803 0 2 0x2 syz-executor 12629 373063 66803 0 3 0x82 nanoslp syz-executor 97020 317570 66803 0 3 0x82 wait syz-executor 67720 412636 66803 0 3 0x82 nanoslp syz-executor 66803 339346 1498 0 3 0x82 kqread syz-executor 1498 37231 45078 0 3 0x10008a sigsusp ksh 45078 134137 10686 0 3 0x98 kqread sshd-session 10686 352110 29324 0 3 0x92 kqread sshd-session 29324 142399 1 0 3 0x88 kqread sshd 57344 229258 8754 74 3 0x1100092 bpf pflogd 8754 220621 1 0 3 0x80 sbwait pflogd 90202 93571 15948 73 3 0x1100090 kqread syslogd 15948 188744 1 0 3 0x100082 sbwait syslogd 96672 354015 1 0 3 0x100080 kqread resolvd 19169 289158 77217 77 3 0x100092 kqread dhcpleased 94851 209678 77217 77 3 0x100092 kqread dhcpleased 77217 466296 1 0 3 0x80 kqread dhcpleased 43068 266558 0 0 3 0x14200 bored smr 89270 32125 0 0 2 0x14200 zerothread 55320 106718 0 0 3 0x14200 aiodoned aiodoned 12051 176681 0 0 3 0x14200 syncer update 2872 323889 0 0 3 0x14200 cleaner cleaner 57778 461863 0 0 3 0x14200 reaper reaper 82961 165967 0 0 3 0x14200 pgdaemon pagedaemon 66451 22 0 0 3 0x14200 bored viomb 74684 336659 0 0 3 0x40014200 acpi0 acpi0 24694 493930 0 0 7 0x40014200 idle1 91892 143095 0 0 3 0x14200 bored softnet3 11663 298621 0 0 3 0x14200 bored softnet2 51032 212202 0 0 3 0x14200 bored softnet1 96484 384664 0 0 3 0x14200 bored softnet0 30599 63797 0 0 3 0x14200 bored systqmp 97399 172059 0 0 3 0x14200 bored systq 91852 413471 0 0 3 0x14200 tmoslp softclockmp 97279 10770 0 0 3 0x40014200 tmoslp softclock 60540 98773 0 0 3 0x40014200 idle0 1 304898 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 82795 (syz-executor) thread 0xffff8000371cb990 (8621) shared rwlock vmmaplk r = 0 (0xfffffd806b2f9f20) #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_readv+0xd8 sys/kern/sys_generic.c:199 #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 (0xffffffff8357fcc8) #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_readv+0xd8 sys/kern/sys_generic.c:199 #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 Process 84500 (syz-executor) thread 0xffff8000ffff6020 (395900) exclusive rrwlock inode r = 0 (0xfffffd806f1ec2c0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:678 #6 ufs_ihashget+0x192 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1201 #8 ufs_lookup+0x19f8 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #11 namei+0x7aa sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #13 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #13 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80679c65f8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 rw_enter+0x41b sys/kern/kern_rwlock.c:309 #2 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #5 vget+0x2bd sys/kern/vfs_subr.c:678 #6 cache_lookup+0x36e sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x218 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x8fa sys/kern/vfs_lookup.c:566 #10 namei+0x7aa sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1852 #12 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:178 [inline] #12 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10205 11212K 11666K 166960K 12137 0 pcb 17 16K 17K 166960K 211 0 rtable 247 7K 7K 166960K 459 0 pf 36 17K 81K 166960K 64 0 ifaddr 44 7K 8K 166960K 56 0 ifgroup 59 2K 2K 166960K 80 0 sysctl 3 0K 0K 166960K 3 0 counters 66 36K 36K 166960K 76 0 ioctlops 0 0K 4K 166960K 1516 0 iov 0 0K 16K 166960K 28 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1431 90K 90K 166960K 1910 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 28 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 17 61K 93K 166960K 674 0 sigio 0 0K 0K 166960K 19 0 proc 72 91K 128K 166960K 586 0 subproc 104 6K 6K 166960K 106 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 59 0 in_multi 99 7K 7K 166960K 123 0 ether_multi 1 0K 0K 166960K 3 0 mrt 2 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 566 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 253 74K 78K 166960K 7895 0 UVM aobj 86 3K 3K 166960K 87 0 pinsyscall 44 88K 104K 166960K 1772 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 41 0 NDP 13 0K 2K 166960K 37 0 temp 56 6819K 6887K 166960K 16001 0 kqueue 13 20K 32K 166960K 102 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 120 205 0 202 4 2 2 3 0 8 1 rtentry 112 120 0 5 4 0 4 4 0 8 0 unpcb 144 681 0 660 7 3 4 4 0 8 3 syncache 336 6 0 6 3 2 1 1 0 8 1 tcpcb 808 311 0 303 15 7 8 8 0 8 6 arp 120 20 0 1 1 0 1 1 0 8 0 inpcb 336 1079 0 1065 19 9 10 13 0 8 8 nd6 136 28 0 1 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 2 0 2 1 0 1 1 0 8 1 pffrag 232 5 0 2 1 0 1 1 0 482 0 pffrnode 88 5 0 2 1 0 1 1 0 8 0 pffrent 40 17 0 14 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 77 0 1 1 0 1 1 0 8 0 pfstkey 128 77 0 1 3 0 3 3 0 8 0 pfstate 376 77 0 1 8 0 8 8 0 8 0 pfrule 1344 24 0 18 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 466 0 8 29 0 29 29 0 8 0 art_table 32 468 0 8 4 0 4 4 0 8 0 art_node 16 119 0 17 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 9 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 84 0 1 3 0 3 3 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 2635 0 1130 95 0 95 95 0 8 0 ffsino 272 2635 0 1130 102 0 102 102 0 8 0 nchpl 144 3623 0 1936 63 0 63 63 0 8 0 uvmvnodes 80 3031 0 0 62 0 62 62 0 8 0 vnodes 216 3031 0 0 169 0 169 169 0 8 0 namei 1024 12315 0 12315 3 2 1 2 0 8 1 percpumem 16 52 0 5 1 0 1 1 0 8 0 kstatmem 264 36 0 10 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 9809 0 9809 3 2 1 2 1 8 1 plimitpl 152 185 0 168 1 0 1 1 0 8 0 sigapl 424 1002 0 951 10 1 9 9 0 8 2 futexpl 64 8793 0 8789 1 0 1 1 0 8 0 knotepl 120 570 0 0 18 0 18 18 0 8 0 kqueuepl 216 190 0 177 3 0 3 3 0 8 2 pipepl 320 328 0 300 8 0 8 8 0 8 5 fdescpl 496 961 0 929 5 0 5 5 0 8 0 filepl 152 6878 0 6618 25 5 20 21 0 8 7 lockfpl 104 239 0 236 1 0 1 1 0 8 0 lockfspl 48 96 0 93 1 0 1 1 0 8 0 sessionpl 144 26 0 16 1 0 1 1 0 8 0 pgrppl 48 49 0 31 1 0 1 1 0 8 0 ucredpl 104 980 0 965 1 0 1 1 0 8 0 zombiepl 144 952 0 951 1 0 1 1 0 8 0 processpl 1160 1002 0 951 6 0 6 6 0 8 1 procpl 648 1901 0 1842 9 1 8 8 0 8 1 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 4 0 3 2 1 1 1 0 8 0 sockpl 664 2009 0 1971 34 22 12 23 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 144 0 0 18 0 18 18 0 8 0 mcl2k 2048 20 0 0 3 0 3 3 0 8 0 mtagpl 96 80 0 0 2 0 2 2 0 8 0 mbufpl 256 3630 0 0 227 0 227 227 0 8 0 bufpl 280 3074 0 100 213 0 213 213 0 8 0 anonpl 24 180165 0 175786 60 20 40 49 0 185 10 amapchunkpl 152 25134 0 24576 30 2 28 28 0 158 4 amappl16 200 4213 0 4179 17 13 4 15 0 8 0 amappl15 192 86 0 86 1 1 0 1 0 8 0 amappl14 184 120 0 107 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1611 0 1579 3 1 2 2 0 8 0 amappl11 160 57 0 43 1 0 1 1 0 8 0 amappl10 152 10 0 10 1 1 0 1 0 8 0 amappl9 144 164 0 164 1 1 0 1 0 8 0 amappl8 136 37 0 34 1 0 1 1 0 8 0 amappl7 128 118 0 104 1 0 1 1 0 8 0 amappl6 120 172 0 169 1 0 1 1 0 8 0 amappl5 112 147 0 134 1 0 1 1 0 8 0 amappl4 104 317 0 298 1 0 1 1 0 8 0 amappl3 96 4831 0 4731 3 0 3 3 0 8 0 amappl2 88 1266 0 1174 3 0 3 3 0 8 0 amappl1 80 9840 0 9186 15 1 14 14 0 8 0 amappl 88 7422 0 7238 5 0 5 5 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 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 86 0 1 2 0 2 2 0 8 0 uaddrrnd 24 961 0 929 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 961 0 929 1 0 1 1 0 8 0 vmmpekpl 168 9870 0 9831 4 1 3 3 0 8 0 vmmpepl 168 66229 0 64204 98 6 92 92 0 357 1 vmsppl 448 960 0 929 6 2 4 5 0 8 0 rwobjpl 56 23997 0 19831 59 0 59 59 0 8 0 pdppl 4096 1929 0 1858 107 34 73 85 0 8 2 pvpl 32 13782 0 0 112 1 111 111 0 265 0 pmappl 248 960 0 929 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 639 0 59 17 0 17 17 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(fffffd80679c6b48,9,0) at witness_checkorder+0x1047 rw_enter(fffffd80679c6b38,1) at rw_enter+0x122 rrw_enter(fffffd80679c6b38,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd805ff90e58,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd805ff90e58,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(0,fffffd805ff90e58,ffff800011a26080,1f,0,1,ebeddb4479f8bba4,0,ffff800000b3e000,0) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd80686cc258) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff815ff3a0,2902,8000,ffffffff8290c0d0,ffff8000371ef2c0) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_read(ffff8000371ef0b0) at spec_read+0x155 sys/kern/spec_vnops.c:215 VOP_READ(fffffd807e207eb8,ffff8000371ef2c0,0,fffffd807f7d34e0) at VOP_READ+0x102 sys/kern/vfs_vops.c:227 vn_read(fffffd806088bd20,ffff8000371ef2c0,0) at vn_read+0x17b sys/kern/vfs_vnops.c:369 dofilereadv(ffff8000371cb990,6,ffff8000371ef2c0,0,ffff8000371ef380) at dofilereadv+0x230 sys/kern/sys_generic.c:252 sys_readv(ffff8000371cb990,ffff8000371ef430,ffff8000371ef380) at sys_readv+0xd8 sys/kern/sys_generic.c:199 syscall(ffff8000371ef430) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371ef430) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd14461ac1e0, 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff800029b7bff0) at sched_idle+0x558 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5