witness: lock order reversal: 1st 0xffff800045ff7930 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xffff8000017af208 inode (&ip->i_lock) lock order [1] fdlock (&newfdp->fd_fd.fd_lock) -> [2] inode (&ip->i_lock) lock order data 0xffffffff84834aa0 -> 0xffffffff84c79880 is missing lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock) #0 rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 #1 sblock+0xbf sys/kern/uipc_socket2.c:536 #2 soreceive+0x3b1 sys/kern/uipc_socket.c:890 #3 fifo_read+0x1d9 sys/miscfs/fifofs/fifo_vnops.c:264 #4 VOP_READ+0x1a8 sys/kern/vfs_vops.c:227 #5 vn_rdwr+0x1bc sys/kern/vfs_vnops.c:-1 #6 vndsetcred+0xbf sys/dev/vnd.c:685 #7 vndioctl+0x12ef sys/dev/vnd.c:486 #8 VOP_IOCTL+0x131 sys/kern/vfs_vops.c:264 #9 vn_ioctl+0x18c sys/kern/vfs_vnops.c:537 #10 sys_ioctl+0x868 sys/kern/sys_generic.c:510 #11 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #12 Xsyscall+0x128 lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] fdlock (&newfdp->fd_fd.fd_lock) #0 rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 #1 unp_externalize+0x550 sys/kern/uipc_usrreq.c:1104 #2 soreceive+0x1029 sys/kern/uipc_socket.c:1029 #3 recvit+0x5c6 sys/kern/uipc_syscalls.c:1078 #4 sys_recvmsg+0x29c sys/kern/uipc_syscalls.c:878 #5 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #6 Xsyscall+0x128 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(ffff8000017af208,9,0) at witness_checkorder+0x19db sys/kern/subr_witness.c:-1 rw_do_enter_write(ffff8000017af1f0,1) at rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 rrw_enter(ffff8000017af1f0,1) at rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 VOP_LOCK(ffff8000017aa6f0,1) at VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 vn_lock(ffff8000017aa6f0,1) at vn_lock+0xca sys/kern/vfs_vnops.c:576 vrele(ffff8000017aa6f0) at vrele+0x113 sys/kern/vfs_subr.c:841 spec_close(ffff80003bb55ae0) at spec_close+0x684 sys/kern/spec_vnops.c:551 VOP_CLOSE(ffff800001824040,9,ffff800000119680,ffff800045ff5780) at VOP_CLOSE+0x1e9 sys/kern/vfs_vops.c:156 vn_closefile(ffff8000016a6460,ffff800045ff5780) at vn_closefile+0x1cc vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffff8000016a6460,ffff800045ff5780) at vn_closefile+0x1cc sys/kern/vfs_vnops.c:621 fdrop(ffff8000016a6460,ffff800045ff5780) at fdrop+0x1c3 sys/kern/kern_descrip.c:1281 knote_drop(ffff8000017e71e0,ffff800045ff5780) at knote_drop+0x23b sys/kern/kern_event.c:2359 knote_remove(ffff800045ff5780,ffff8000017e1d20,ffff8000017e1db0,4,0) at knote_remove+0x346 sys/kern/kern_event.c:-1 knote_fdclose(ffff800045ff5780,4) at knote_fdclose+0x14f sys/kern/kern_event.c:2222 fdrelease(ffff800045ff5780,4) at fdrelease+0x13a sys/kern/kern_descrip.c:760 sys_closefrom(ffff800045ff5780,ffff80003bb56030,ffff80003bb55fa0) at sys_closefrom+0x1bc sys/kern/kern_descrip.c:1471 syscall(ffff80003bb56030) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb56030) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1873ca39470, count: -18 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003bb55720 rbx 0xffffffff84834ae0 .str.17 rdx 0xffff80000016f980 rcx 0x7ffff acpi_pdirpa+0x6be70 rax 0xffff8000302df000 r8 0xffff80003bb55500 r9 0xffff80003bb554a0 r10 0 r11 0xffffffff82673480 x86_bus_space_io_read_1 r12 0xffffffff84c79860 ffs_vget.__lock_type r13 0xffff800045ff7930 r14 0x3 r15 0xffffffff84c798a0 .str.13 rip 0xffffffff83963de7 db_enter+0x17 cs 0x8 rflags 0x246 rsp 0xffff80003bb55720 ss 0x10 db_enter+0x17: popq %rbp ddb{0}> show proc PROC (syz-executor) tid=460421 pid=8581 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=68, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000298f4010,0xffff8000298f5248 process=0xffff8000298a44d8 user=0xffff80003bb4b000, vmspace=0xffff8000017d11f0 estcpu=18, cpticks=7, pctcpu=0.7, user=0, sys=7, intr=0 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 99292 26881 75251 0 2 0x40 0 syz-executor 74520 508015 65220 0 7 0x40 0 syz-executor 56787 171717 48352 0 2 0 0 syz-executor 56787 498833 48352 0 2 0 0x4000000 syz-executor 8581 520148 61313 0 2 0 0 syz-executor * 8581 460421 61313 0 7 0 0x4000000 syz-executor 8581 438526 61313 0 3 0 0x4000080 fsleep syz-executor 84076 112103 24122 0 2 0x100000 0 sh 65220 329748 92381 0 3 0x82 0 ppwait syz-executor 75095 191903 8753 0 3 0x10 0x80 nanoslp syz-executor 75095 188811 8753 0 3 0x10 0x4000080 netcon syz-executor 75095 331542 8753 0 3 0x10 0x4000080 fsleep syz-executor 5951 459062 92381 0 2 0x2 0 syz-executor 24122 39697 90981 0 2 0x100002 0 sh 82801 2546 16016 0 2 0x100002 0 sh 75251 519187 92381 0 3 0x82 0 ppwait syz-executor 90981 18794 92381 0 3 0x2 0x80 wait syz-executor 16016 435684 92381 0 3 0x2 0x80 wait syz-executor 71871 167407 1 0 3 0 0x80 nanoslp init 48352 243450 92381 0 3 0x2 0x80 nanoslp syz-executor 32967 487552 0 0 3 0x14000 0x280 nfsidl nfsio 86456 319497 0 0 3 0x14000 0x280 nfsidl nfsio 13565 111763 0 0 3 0x14000 0x280 nfsidl nfsio 81533 282095 0 0 3 0x14000 0x280 nfsidl nfsio 89264 10018 0 0 3 0x14000 0x280 nfsidl nfsio 14319 23140 0 0 3 0x14000 0x280 nfsidl nfsio 72047 49365 0 0 3 0x14000 0x280 nfsidl nfsio 24069 271048 0 0 3 0x14000 0x280 nfsidl nfsio 82373 101085 0 0 3 0x14000 0x280 nfsidl nfsio 98615 330345 0 0 3 0x14000 0x280 nfsidl nfsio 94539 90979 0 0 3 0x14000 0x280 nfsidl nfsio 9410 466094 0 0 3 0x14000 0x280 nfsidl nfsio 27202 117253 0 0 3 0x14000 0x280 nfsidl nfsio 19332 150456 0 0 3 0x14000 0x280 nfsidl nfsio 87093 430112 0 0 3 0x14000 0x280 nfsidl nfsio 78028 15119 0 0 3 0x14000 0x280 nfsidl nfsio 27808 328488 0 0 3 0x14000 0x280 nfsidl nfsio 76233 97375 0 0 3 0x14000 0x280 nfsidl nfsio 17887 494914 0 0 3 0x14000 0x280 nfsidl nfsio 37825 461740 0 0 3 0x14000 0x280 nfsidl nfsio 8753 81249 92381 0 3 0x2 0x80 nanoslp syz-executor 61313 287591 92381 0 3 0x2 0x80 nanoslp syz-executor 92381 490475 1 0 3 0x2 0x80 kqread syz-executor 36806 141927 0 0 3 0x14000 0x200 bored smr 27968 116625 0 0 2 0x14000 0x200 zerothread 30594 9337 0 0 3 0x14000 0x200 aiodoned aiodoned 93826 478643 0 0 3 0x14000 0x200 syncer update 79686 487134 0 0 3 0x14000 0x200 cleaner cleaner 1000 461735 0 0 3 0x14000 0x200 reaper reaper 57624 242367 0 0 3 0x14000 0x200 pgdaemon pagedaemon 86537 387764 0 0 3 0x14000 0x200 bored viomb 44894 1402 0 0 3 0x14000 0x40000200 acpi0 acpi0 39424 120794 0 0 3 0x14000 0x40000200 idle1 3826 178448 0 0 3 0x14000 0x200 bored softnet1 20397 416022 0 0 3 0x14000 0x200 bored softnet0 33165 234939 0 0 3 0x14000 0x200 bored systqmp 70486 136162 0 0 3 0x14000 0x200 bored systq 57574 41114 0 0 3 0x14000 0x200 tmoslp softclockmp 54139 154409 0 0 3 0x14000 0x40000200 tmoslp softclock 75501 157500 0 0 3 0x14000 0x40000200 idle0 1 418541 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks Process 8581 (syz-executor) thread 0xffff800045ff5780 (460421) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85df94c0) #0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x632 sys/kern/subr_witness.c:1160 #1 vn_closefile+0x90 sys/kern/vfs_vnops.c:614 #2 fdrop+0x1c3 sys/kern/kern_descrip.c:1281 #3 knote_drop+0x23b sys/kern/kern_event.c:2359 #4 knote_remove+0x346 sys/kern/kern_event.c:-1 #5 knote_fdclose+0x14f sys/kern/kern_event.c:2222 #6 fdrelease+0x13a sys/kern/kern_descrip.c:760 #7 sys_closefrom+0x1bc sys/kern/kern_descrip.c:1471 #8 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #9 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xffff800045ff7930) #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_write+0x53e sys/kern/kern_rwlock.c:320 #2 sys_closefrom+0x27d sys/kern/kern_descrip.c:1468 #3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11045 12157K 13223K 166960K 12455 0 pcb 17 24K 24K 166960K 36 0 rtable 137 7K 13K 166960K 723 0 pf 34 22K 23K 166960K 86 0 ifaddr 30 7K 12K 166960K 103 0 ifgroup 55 2K 2K 166960K 132 0 sysctl 1 1K 13K 166960K 5 0 counters 70 42K 43K 166960K 108 0 ioctlops 0 0K 4K 166960K 1516 0 iov 0 0K 0K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 1 0K 0K 166960K 5 0 vnodes 1333 86K 86K 166960K 1649 0 UFS quota 1 36K 36K 166960K 1 0 UFS mount 5 44K 44K 166960K 5 0 shm 2 2K 6K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 292K 166960K 11964 0 file desc 17 65K 93K 166960K 454 0 sigio 0 0K 0K 166960K 1 0 proc 9 30K 177K 166960K 961 0 subproc 72 9K 9K 166960K 225 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 20K 20K 166960K 1 0 ip_moptions 0 0K 0K 166960K 6 0 in_multi 45 3K 7K 166960K 233 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 0 0K 2K 166960K 564 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 107 124K 281K 166960K 5284 0 UVM aobj 7 4K 4K 166960K 7 0 pinsyscall 1043 1749K 1771K 166960K 1964 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 12 0K 2K 166960K 71 0 temp 36 9166K 9194K 166960K 6899 0 kqueue 2 8K 45K 166960K 44 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 60 0 60 1 0 1 1 0 8 1 rtentry 176 247 0 187 6 0 6 6 0 8 1 unpcb 144 94 0 92 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 18 0 16 1 0 1 1 0 8 0 arp 136 44 0 34 1 0 1 1 0 8 0 inpcb 328 177 0 175 2 0 2 2 0 8 1 nd6 152 60 0 51 1 0 1 1 0 8 0 kcovpl 48 25 0 17 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 30 0 0 1 0 1 1 0 8 0 pfstkey 128 30 0 0 1 0 1 1 0 8 0 pfstate 448 30 0 0 4 0 4 4 0 8 0 pfrule 1360 25 0 20 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 991 0 751 29 0 29 29 0 8 7 art_table 40 992 0 751 5 0 5 5 0 8 0 art_node 32 247 0 193 1 0 1 1 0 8 0 semapl 72 4 0 1 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1764 0 266 94 0 94 94 0 8 0 ffsino 296 1764 0 266 116 0 116 116 0 8 0 nchpl 144 2100 0 350 65 0 65 65 0 8 0 vnodes 216 2099 0 0 117 0 117 117 0 8 0 namei 1024 9034 0 9034 4 3 1 3 0 8 1 percpumem 16 70 0 19 1 0 1 1 0 8 0 kstatmem 264 65 0 38 2 0 2 2 0 8 0 scxspl 216 7978 0 7978 11 4 7 8 1 8 7 plimitpl 152 56 0 47 1 0 1 1 0 8 0 sigapl 424 759 0 703 10 1 9 9 0 8 1 knotepl 120 133 0 0 5 0 5 5 0 8 0 kqueuepl 224 57 0 55 1 0 1 1 0 8 0 pipepl 344 188 0 161 3 0 3 3 0 8 0 fdescpl 528 723 0 703 3 0 3 3 0 8 0 filepl 160 2662 0 2507 11 0 11 11 0 8 1 lockfpl 104 112 0 112 2 1 1 2 0 8 1 lockfspl 48 56 0 56 1 0 1 1 0 8 1 sessionpl 144 44 0 42 1 0 1 1 0 8 0 pgrppl 48 70 0 60 1 0 1 1 0 8 0 ucredpl 104 200 0 196 1 0 1 1 0 8 0 zombiepl 144 703 0 703 1 0 1 1 0 8 1 processpl 1232 759 0 703 6 0 6 6 0 8 0 procpl 664 964 0 903 8 1 7 7 0 8 0 sockpl 752 333 0 329 4 0 4 4 0 8 3 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mextrefs 64 20 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 157 0 0 10 0 10 10 0 8 0 bufpl 272 2598 0 105 167 0 167 167 0 8 0 anonpl 32 3795 0 0 31 0 31 31 0 222 0 amapchunkpl 152 14624 0 14206 23 1 22 22 0 158 5 amappl16 200 1905 0 1898 6 3 3 5 0 8 1 amappl15 192 11 0 11 1 1 0 1 0 8 0 amappl14 184 593 0 591 1 0 1 1 0 8 0 amappl13 176 152 0 152 1 0 1 1 0 8 1 amappl12 168 1027 0 1012 2 0 2 2 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 82 0 81 1 0 1 1 0 8 0 amappl9 144 273 0 273 1 0 1 1 0 8 1 amappl8 136 156 0 156 1 0 1 1 0 8 1 amappl7 128 177 0 175 1 0 1 1 0 8 0 amappl6 120 321 0 319 1 0 1 1 0 8 0 amappl5 112 98 0 98 1 0 1 1 0 8 1 amappl4 104 334 0 332 1 0 1 1 0 8 0 amappl3 96 2611 0 2561 3 0 3 3 0 8 1 amappl2 88 783 0 763 2 0 2 2 0 8 0 amappl1 80 12743 0 12656 16 2 14 15 0 8 6 amappl 88 4315 0 4220 5 0 5 5 0 92 1 uvmvnodes 80 99 0 0 3 0 3 3 0 8 0 dma4096 4096 34 0 34 2 1 1 1 0 8 1 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 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 723 0 703 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 723 0 703 1 0 1 1 0 8 0 vmmpekpl 168 8069 0 8026 3 0 3 3 0 8 0 vmmpepl 168 55529 0 54798 91 4 87 88 0 357 47 vmsppl 488 722 0 703 5 0 5 5 0 8 1 rwobjpl 80 18729 0 18364 25 1 24 25 0 8 2 pdppl 4096 1454 0 1406 120 66 54 86 0 8 6 pvpl 32 10902 0 0 89 1 88 88 0 265 0 pmappl 256 722 0 703 3 0 3 3 0 8 0 extentpl 40 47 0 29 1 0 1 1 0 8 0 phpool 120 464 0 73 13 0 13 13 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(ffff8000017af208,9,0) at witness_checkorder+0x19db sys/kern/subr_witness.c:-1 rw_do_enter_write(ffff8000017af1f0,1) at rw_do_enter_write+0xc4 sys/kern/kern_rwlock.c:234 rrw_enter(ffff8000017af1f0,1) at rrw_enter+0xf0 sys/kern/kern_rwlock.c:621 VOP_LOCK(ffff8000017aa6f0,1) at VOP_LOCK+0x17e sys/kern/vfs_vops.c:527 vn_lock(ffff8000017aa6f0,1) at vn_lock+0xca sys/kern/vfs_vnops.c:576 vrele(ffff8000017aa6f0) at vrele+0x113 sys/kern/vfs_subr.c:841 spec_close(ffff80003bb55ae0) at spec_close+0x684 sys/kern/spec_vnops.c:551 VOP_CLOSE(ffff800001824040,9,ffff800000119680,ffff800045ff5780) at VOP_CLOSE+0x1e9 sys/kern/vfs_vops.c:156 vn_closefile(ffff8000016a6460,ffff800045ff5780) at vn_closefile+0x1cc vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffff8000016a6460,ffff800045ff5780) at vn_closefile+0x1cc sys/kern/vfs_vnops.c:621 fdrop(ffff8000016a6460,ffff800045ff5780) at fdrop+0x1c3 sys/kern/kern_descrip.c:1281 knote_drop(ffff8000017e71e0,ffff800045ff5780) at knote_drop+0x23b sys/kern/kern_event.c:2359 knote_remove(ffff800045ff5780,ffff8000017e1d20,ffff8000017e1db0,4,0) at knote_remove+0x346 sys/kern/kern_event.c:-1 knote_fdclose(ffff800045ff5780,4) at knote_fdclose+0x14f sys/kern/kern_event.c:2222 fdrelease(ffff800045ff5780,4) at fdrelease+0x13a sys/kern/kern_descrip.c:760 sys_closefrom(ffff800045ff5780,ffff80003bb56030,ffff80003bb55fa0) at sys_closefrom+0x1bc sys/kern/kern_descrip.c:1471 syscall(ffff80003bb56030) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bb56030) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1873ca39470, count: -18 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x19: leave ddb{1}> trace x86_ipi_db(ffff800028fe3ff0) 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(ffffffff85df8cc0) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff85df8cc0) at __mp_lock+0x272 sys/kern/kern_lock.c:173 syscall(ffff800029910fe0) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff800029910fe0) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7436d6d21c80, count: -6 ddb{1}>