witness: lock order reversal: 1st 0xfffffd806e79f068 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd8064b890a8 inode (&ip->i_lock) lock order data w2 -> w1 missing lock order data w1 -> w2 missing Stopped at db_enter+0x18: 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+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd8064b890a8,9,0) at witness_checkorder+0x108b rw_enter(fffffd8064b89098,1) at rw_enter+0xd4 rrw_enter(fffffd8064b89098,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8063a2b150,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8063a2b150,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8063a2b150,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff8000244f7cf0,fffffd8063a2b150,fffffd807f7d8660,ffff8000214b0f40,ffff8000214b0f20) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff8000244f7cf0,ffffffff823b99f0,ffff8000214b1028,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff8000244f7cf0,ffffffff823b99f0,ffff8000214b1028,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff8000244f7cf0,ffff8000214b1098,ffff8000214b10e0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000214b1160) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000214b1160) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1b13ef1eb10, count: -12 ddb{0}> show registers rdi 0xffff8000212ac000 rsi 0xb005 __ALIGN_SIZE+0xa005 rbp 0xffff8000214b0b50 rbx 0x3 rdx 0xffff8000212ac000 rcx 0xb004 __ALIGN_SIZE+0xa004 rax 0xffffffff81ae9fb7 db_enter+0x17 r8 0xffffffff81f9fb91 witness_checkorder+0x1061 r9 0x5 r10 0x527e8cfdecaef5bb r11 0x6e764ca82cfc62db r12 0 r13 0xfffffd8064b890a8 r14 0 r15 0xfffffd8002cf76c0 rip 0xffffffff81ae9fb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000214b0b40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=352471 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000244f6fd0,0xffffffff827f7c48 process=0xffff800024534450 user=0xffff8000214ac000, vmspace=0xfffffd80647912f8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79381 21906 27458 0 7 0 syz-executor.0 *79381 352471 27458 0 7 0x4000001 syz-executor.0 34491 377339 0 0 3 0x14280 nfsidl nfsio 89848 28031 0 0 3 0x14280 nfsidl nfsio 86799 503171 0 0 3 0x14280 nfsidl nfsio 47434 509228 0 0 3 0x14280 nfsidl nfsio 41116 312928 0 0 3 0x14280 nfsidl nfsio 5242 410158 0 0 3 0x14280 nfsidl nfsio 42527 480548 0 0 3 0x14280 nfsidl nfsio 99234 265373 0 0 3 0x14280 nfsidl nfsio 66051 326493 0 0 3 0x14280 nfsidl nfsio 47103 231938 0 0 3 0x14280 nfsidl nfsio 57229 419803 0 0 3 0x14280 nfsidl nfsio 79976 228247 0 0 3 0x14280 nfsidl nfsio 94283 151284 0 0 3 0x14280 nfsidl nfsio 40619 168255 0 0 3 0x14280 nfsidl nfsio 55829 185179 0 0 3 0x14280 nfsidl nfsio 21051 406096 0 0 3 0x14280 nfsidl nfsio 36149 84778 0 0 3 0x14280 nfsidl nfsio 13620 422444 0 0 3 0x14280 nfsidl nfsio 26515 422192 0 0 3 0x14280 nfsidl nfsio 85983 219330 0 0 3 0x14280 nfsidl nfsio 27458 137266 91951 0 3 0x82 nanoslp syz-executor.0 40055 404739 91951 0 3 0x2 biowait syz-executor.1 91951 403832 73438 0 3 0x82 thrsleep syz-fuzzer 91951 195404 73438 0 3 0x4000082 nanoslp syz-fuzzer 91951 519931 73438 0 3 0x4000082 nanoslp syz-fuzzer 91951 376716 73438 0 3 0x4000082 thrsleep syz-fuzzer 91951 202247 73438 0 3 0x4000082 thrsleep syz-fuzzer 91951 57164 73438 0 3 0x4000082 kqread syz-fuzzer 91951 23117 73438 0 3 0x4000082 thrsleep syz-fuzzer 91951 352128 73438 0 3 0x4000082 thrsleep syz-fuzzer 73438 3466 4039 0 3 0x10008a sigsusp ksh 4039 375420 92304 0 3 0x92 select sshd 33655 116648 1 0 3 0x100083 ttyin getty 92304 81086 1 0 3 0x80 select sshd 74607 132994 57060 74 3 0x100092 bpf pflogd 57060 487406 1 0 3 0x80 netio pflogd 40857 505006 22194 73 3 0x100090 kqread syslogd 22194 174346 1 0 3 0x100082 netio syslogd 98747 363862 1 77 3 0x100090 poll dhclient 62668 167223 1 0 3 0x80 poll dhclient 68980 439279 0 0 3 0x14200 bored smr 12116 199212 0 0 3 0x14200 pgzero zerothread 13575 305137 0 0 3 0x14200 aiodoned aiodoned 28815 181308 0 0 3 0x14200 syncer update 66076 341846 0 0 3 0x14200 cleaner cleaner 18500 368353 0 0 3 0x14200 reaper reaper 27007 359794 0 0 3 0x14200 pgdaemon pagedaemon 1679 417643 0 0 3 0x14200 bored crynlk 28561 471783 0 0 3 0x14200 bored crypto 19476 497030 0 0 3 0x14200 bored viomb 48894 499639 0 0 3 0x40014200 acpi0 acpi0 28972 244051 0 0 3 0x40014200 idle1 85454 393683 0 0 3 0x14200 bored softnet 17711 237774 0 0 3 0x14200 bored systqmp 15574 406374 0 0 3 0x14200 bored systq 32582 104060 0 0 3 0x40014200 bored softclock 18083 433416 0 0 3 0x40014200 idle0 1 277447 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 79381 (syz-executor.0) thread 0xffff8000244f7cf0 (352471) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82952e30) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 ktrstruct+0xee #2 sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 #3 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #4 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd806e79f068) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 sys_socketpair+0x219 #2 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #3 Xsyscall+0x128 Process 40055 (syz-executor.1) thread 0xffff800021269500 (404739) exclusive rrwlock inode r = 0 (0xfffffd8064b89e78) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 rw_enter+0x416 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1f7 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x6b sys/ufs/ffs/ffs_vfsops.c:1321 #8 ufs_lookup+0x151d sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:88 #10 vfs_lookup+0x708 sys/kern/vfs_lookup.c:562 #11 namei+0x58a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1859 #13 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806abe53c8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 rw_enter+0x416 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:413 #6 namei+0x58a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1859 #8 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10132 6500K 6933K 78643K 12142 0 pcb 13 8K 8K 78643K 132 0 rtable 105 3K 3K 78643K 360 0 ifaddr 49 11K 11K 78643K 80 0 counters 44 34K 34K 78643K 46 0 ioctlops 0 0K 4K 78643K 1504 0 iov 0 0K 24K 78643K 64 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1218 77K 77K 78643K 1619 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 135 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 986 0 proc 61 63K 95K 78643K 479 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 90 0 in_multi 33 2K 2K 78643K 175 0 ether_multi 1 0K 0K 78643K 44 0 mrt 0 0K 0K 78643K 68 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 385 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 243 431K 432K 78643K 13026 0 UVM aobj 5 2K 2K 78643K 5 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 40 0 NDP 7 0K 0K 78643K 36 0 temp 76 3973K 4039K 78643K 10239 0 kqueue 3 4K 8K 78643K 47 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 20 0 0 1 0 1 1 0 8 0 rtpcb 120 26 0 24 1 0 1 1 0 8 0 rtentry 112 97 0 53 2 0 2 2 0 8 0 unpcb 120 273 0 245 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpcb 736 150 0 146 5 4 1 4 0 8 0 arp 120 9 0 3 1 0 1 1 0 8 0 inpcb 304 442 0 436 2 1 1 2 0 8 0 rttmr 72 18 0 18 1 1 0 1 0 8 0 nd6 48 31 0 25 1 0 1 1 0 8 0 kcovpl 48 3 0 1 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 26 0 9 1 0 1 1 0 8 0 pfstkey 112 26 0 9 1 0 1 1 0 8 0 pfstate 320 26 0 9 3 0 3 3 0 8 1 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 233 0 45 12 0 12 12 0 8 0 art_table 32 234 0 45 2 0 2 2 0 8 0 art_node 16 96 0 56 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 128 0 118 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2709 0 1280 91 1 90 90 0 8 0 ffsino 272 2709 0 1280 96 0 96 96 0 8 0 nchpl 144 3998 0 2404 60 0 60 60 0 8 0 uvmvnodes 72 2984 0 0 55 0 55 55 0 8 0 vnodes 224 2984 0 0 176 0 176 176 0 8 0 namei 1024 9981 0 9981 1 0 1 1 0 8 1 percpumem 16 34 0 1 1 0 1 1 0 8 0 vcpupl 1984 25 0 0 4 0 4 4 0 8 0 vmpool 560 25 0 0 2 0 2 2 0 8 0 scxspl 216 14292 0 14291 9 8 1 8 0 8 0 plimitpl 152 66 0 58 1 0 1 1 0 8 0 sigapl 424 1218 0 1166 6 0 6 6 0 8 0 futexpl 56 7157 0 7157 1 0 1 1 0 8 1 knotepl 112 119 0 99 1 0 1 1 0 8 0 kqueuepl 168 361 0 359 1 0 1 1 0 8 0 pipepl 336 106 0 95 2 0 2 2 0 8 0 fdescpl 496 1182 0 1166 3 0 3 3 0 8 0 filepl 152 4179 0 4076 5 0 5 5 0 8 1 lockfpl 104 147 0 146 1 0 1 1 0 8 0 lockfspl 48 71 0 70 1 0 1 1 0 8 0 sessionpl 144 19 0 8 1 0 1 1 0 8 0 pgrppl 48 66 0 55 1 0 1 1 0 8 0 ucredpl 96 452 0 443 1 0 1 1 0 8 0 zombiepl 144 1166 0 1166 1 0 1 1 0 8 1 processpl 1080 1218 0 1166 4 0 4 4 0 8 0 procpl 672 2342 0 2282 6 0 6 6 0 8 0 sockpl 432 741 0 705 5 0 5 5 0 8 0 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 144 0 0 16 0 16 16 0 8 0 mtagpl 96 53 0 0 2 0 2 2 0 8 0 mbufpl 256 361 0 0 23 0 23 23 0 8 0 bufpl 280 8895 0 2629 448 0 448 448 0 8 0 anonpl 24 300975 0 288655 93 4 89 89 0 186 10 amapchunkpl 152 30477 0 29998 22 2 20 20 0 158 0 amappl16 200 3325 0 2884 35 4 31 31 0 8 7 amappl15 192 63 0 56 1 0 1 1 0 8 0 amappl14 184 167 0 164 1 0 1 1 0 8 0 amappl13 176 32 0 31 1 0 1 1 0 8 0 amappl12 168 57 0 46 1 0 1 1 0 8 0 amappl11 160 50 0 39 1 0 1 1 0 8 0 amappl10 152 24 0 17 1 0 1 1 0 8 0 amappl9 144 778 0 775 1 0 1 1 0 8 0 amappl8 136 944 0 903 2 0 2 2 0 8 0 amappl7 128 540 0 529 1 0 1 1 0 8 0 amappl6 120 112 0 97 1 0 1 1 0 8 0 amappl5 112 1068 0 1057 1 0 1 1 0 8 0 amappl4 104 528 0 504 1 0 1 1 0 8 0 amappl3 96 52 0 46 1 0 1 1 0 8 0 amappl2 88 632 0 560 2 0 2 2 0 8 0 amappl1 80 22505 0 22088 13 3 10 12 0 8 0 amappl 88 12638 0 12499 4 0 4 4 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 64 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1207 0 1166 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1207 0 1166 1 0 1 1 0 8 0 vmmpekpl 168 9122 0 9085 2 0 2 2 0 8 0 vmmpepl 168 129671 0 127934 90 4 86 86 0 357 5 vmsppl 368 1206 0 1166 4 0 4 4 0 8 0 rwobjpl 56 25880 0 24717 20 1 19 19 0 8 1 pdppl 4096 2421 0 2357 82 16 66 66 0 8 2 pvpl 32 708731 0 699481 146 43 103 129 0 265 20 pmappl 232 1206 0 1166 4 1 3 3 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 344 0 24 10 0 10 10 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:398 witness_checkorder(fffffd8064b890a8,9,0) at witness_checkorder+0x108b rw_enter(fffffd8064b89098,1) at rw_enter+0xd4 rrw_enter(fffffd8064b89098,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8063a2b150,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8063a2b150,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8063a2b150,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff8000244f7cf0,fffffd8063a2b150,fffffd807f7d8660,ffff8000214b0f40,ffff8000214b0f20) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff8000244f7cf0,ffffffff823b99f0,ffff8000214b1028,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff8000244f7cf0,ffffffff823b99f0,ffff8000214b1028,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff8000244f7cf0,ffff8000214b1098,ffff8000214b10e0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000214b1160) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000214b1160) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1b13ef1eb10, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0x7f7ffffe8b40, count: -3