witness: lock order reversal: 1st 0xfffffd8079e3c068 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806f91fd68 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(fffffd806f91fd68,9,0) at witness_checkorder+0x108b rw_enter(fffffd806f91fd58,1) at rw_enter+0xd4 rrw_enter(fffffd806f91fd58,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd807b1a2390,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd807b1a2390,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd807b1a2390,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800022349270,fffffd807b1a2390,fffffd807f7d8a20,ffff800022375a50,ffff800022375a30) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800022349270,ffffffff823bae47,ffff800022375b38,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800022349270,ffffffff823bae47,ffff800022375b38,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800022349270,ffff800022375ba8,ffff800022375bf0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff800022375c70) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022375c70) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe321f5c2570, count: -12 ddb{0}> show registers rdi 0xffff8000232b4000 rsi 0xc72c __ALIGN_SIZE+0xb72c rbp 0xffff800022375660 rbx 0x3 rdx 0xffff8000232b4000 rcx 0xc72b __ALIGN_SIZE+0xb72b rax 0xffffffff818b6a67 db_enter+0x17 r8 0xffffffff8203b7c1 witness_checkorder+0x1061 r9 0x5 r10 0xdcf3a79334fe1a46 r11 0xb222051ba222317c r12 0 r13 0xfffffd806f91fd68 r14 0 r15 0xfffffd8002cf9740 rip 0xffffffff818b6a68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022375650 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=513863 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800022348a90,0xffffffff82823898 process=0xffff8000224ad0f8 user=0xffff800022370000, vmspace=0xfffffd8066a9d5d8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 68415 24735 79383 0 7 0x1 syz-executor.1 *68415 513863 79383 0 7 0x4000001 syz-executor.1 79383 321564 3905 0 3 0x82 nanoslp syz-executor.1 89271 279778 1 0 3 0x100083 ttyin getty 35590 199506 3905 0 3 0x82 nanoslp syz-executor.0 6430 78156 0 0 3 0x14280 nfsidl nfsio 14347 37252 0 0 3 0x14280 nfsidl nfsio 12737 160454 0 0 3 0x14280 nfsidl nfsio 89136 235510 0 0 3 0x14280 nfsidl nfsio 32295 508473 0 0 3 0x14280 nfsidl nfsio 19520 506087 0 0 3 0x14280 nfsidl nfsio 83243 285298 0 0 3 0x14280 nfsidl nfsio 16133 438456 0 0 3 0x14280 nfsidl nfsio 97700 434758 0 0 3 0x14280 nfsidl nfsio 16819 61457 0 0 3 0x14280 nfsidl nfsio 96229 328926 0 0 3 0x14280 nfsidl nfsio 41609 133052 0 0 3 0x14280 nfsidl nfsio 6290 327680 0 0 3 0x14280 nfsidl nfsio 24434 105770 0 0 3 0x14280 nfsidl nfsio 49876 230537 0 0 3 0x14280 nfsidl nfsio 99952 120262 0 0 3 0x14280 nfsidl nfsio 79507 194734 0 0 3 0x14280 nfsidl nfsio 20982 82382 0 0 3 0x14280 nfsidl nfsio 55296 191027 0 0 3 0x14280 nfsidl nfsio 76795 461925 0 0 3 0x14280 nfsidl nfsio 86347 142543 0 0 3 0x14200 bored sosplice 3905 175879 59902 0 3 0x82 thrsleep syz-fuzzer 3905 261809 59902 0 3 0x4000082 thrsleep syz-fuzzer 3905 114393 59902 0 3 0x4000082 kqread syz-fuzzer 3905 51970 59902 0 3 0x4000082 thrsleep syz-fuzzer 3905 159480 59902 0 3 0x4000082 thrsleep syz-fuzzer 3905 198387 59902 0 3 0x4000082 thrsleep syz-fuzzer 3905 515856 59902 0 3 0x4000082 thrsleep syz-fuzzer 3905 39924 59902 0 3 0x4000082 thrsleep syz-fuzzer 59902 195121 88736 0 3 0x10008a sigsusp ksh 88736 357457 81393 0 3 0x92 select sshd 81393 96296 1 0 3 0x80 select sshd 37698 435535 61748 74 3 0x100092 bpf pflogd 61748 346684 1 0 3 0x80 netio pflogd 20610 190994 1554 73 3 0x100090 kqread syslogd 1554 417703 1 0 3 0x100082 netio syslogd 5825 409014 1 77 3 0x100090 poll dhclient 66519 249497 1 0 3 0x80 poll dhclient 93256 136612 0 0 3 0x14200 bored smr 52133 403711 0 0 3 0x14200 pgzero zerothread 18598 246916 0 0 3 0x14200 aiodoned aiodoned 51789 361729 0 0 3 0x14200 syncer update 85709 298543 0 0 3 0x14200 cleaner cleaner 63038 316492 0 0 3 0x14200 reaper reaper 92649 66276 0 0 3 0x14200 pgdaemon pagedaemon 58286 155908 0 0 3 0x14200 bored crynlk 59368 303028 0 0 3 0x14200 bored crypto 49832 411605 0 0 3 0x14200 bored viomb 48062 477019 0 0 3 0x40014200 acpi0 acpi0 41681 277856 0 0 3 0x40014200 idle1 7111 453728 0 0 3 0x14200 bored softnet 8924 135627 0 0 3 0x14200 bored systqmp 15059 54435 0 0 3 0x14200 bored systq 55494 76364 0 0 3 0x40014200 bored softclock 72422 408496 0 0 3 0x40014200 idle0 1 12018 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 68415 (syz-executor.1) thread 0xffff800022349270 (513863) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8282c6e0) #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:585 #4 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd8079e3c068) #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:585 #3 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10196 6519K 7268K 78643K 17098 0 pcb 13 8K 8K 78643K 313 0 rtable 109 4K 4K 78643K 1114 0 ifaddr 86 15K 15K 78643K 292 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 128 0 ioctlops 0 0K 4K 78643K 1725 0 iov 0 0K 24K 78643K 217 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1223 77K 77K 78643K 3118 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 57 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 423 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 6129 0 sigio 0 0K 0K 78643K 32 0 proc 64 63K 95K 78643K 854 0 subproc 32 2K 2K 78643K 107 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 445 0 in_multi 33 2K 2K 78643K 284 0 ether_multi 1 0K 0K 78643K 52 0 mrt 0 0K 0K 78643K 55 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 596 0 pfkey data 0 0K 1K 78643K 5 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 276 292K 293K 78643K 74559 0 UVM aobj 72 8K 8K 78643K 84 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 154 0 NDP 16 0K 0K 78643K 84 0 temp 146 3983K 4048K 78643K 49467 0 kqueue 3 4K 24K 78643K 292 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 120 340 0 338 1 0 1 1 0 8 0 rtentry 112 191 0 147 2 0 2 2 0 8 0 unpcb 120 793 0 781 1 0 1 1 0 8 0 syncache 296 39 0 39 5 5 0 1 0 8 0 tcpqe 32 210 0 210 3 3 0 1 0 8 0 tcpcb 736 713 0 707 20 19 1 4 0 8 0 arp 120 28 0 22 1 0 1 1 0 8 0 inpcb 304 2220 0 2214 6 5 1 2 0 8 0 rttmr 72 18 0 18 2 2 0 1 0 8 0 nd6 48 33 0 27 1 0 1 1 0 8 0 pkpcb 40 53 0 53 9 9 0 1 0 8 0 kcovpl 48 6 0 4 1 0 1 1 0 8 0 ppxss 1128 22 0 22 4 4 0 1 0 8 0 pffrag 232 8 0 8 2 2 0 1 0 482 0 pffrnode 88 8 0 8 2 2 0 1 0 8 0 pffrent 40 192 0 192 2 2 0 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 pfrktable 1344 14 0 14 1 1 0 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 264 5 0 0 1 0 1 1 0 8 0 pfstitem 24 90 0 88 1 0 1 1 0 8 0 pfstkey 112 90 0 88 2 1 1 2 0 8 0 pfstate 320 90 0 88 5 4 1 5 0 8 0 pfrule 1360 99 0 93 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 630 0 438 16 4 12 13 0 8 0 art_table 32 631 0 438 2 0 2 2 0 8 0 art_node 16 190 0 150 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 11 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 421 0 411 1 0 1 1 0 8 0 shmpl 112 81 0 12 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 8722 0 7299 91 1 90 90 0 8 0 ffsino 272 8722 0 7299 95 0 95 95 0 8 0 nchpl 144 15580 0 13983 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 37679 0 37679 2 1 1 1 0 8 1 percpumem 16 75 0 42 1 0 1 1 0 8 0 vcpupl 1984 19 0 0 3 0 3 3 0 8 0 vmpool 560 20 0 1 2 0 2 2 0 8 0 scsiplug 72 7 0 7 1 1 0 1 0 8 0 scxspl 216 47251 0 47251 10 9 1 8 0 8 1 plimitpl 152 141 0 133 1 0 1 1 0 8 0 sigapl 424 6356 0 6303 8 1 7 7 0 8 0 futexpl 56 40663 0 40663 2 1 1 1 0 8 1 knotepl 112 785 0 765 2 1 1 2 0 8 0 kqueuepl 168 3383 0 3380 1 0 1 1 0 8 0 pipepl 336 250 0 239 7 5 2 3 0 8 0 fdescpl 496 6319 0 6303 3 0 3 3 0 8 0 filepl 152 19296 0 19192 10 5 5 7 0 8 0 lockfpl 104 456 0 455 1 0 1 1 0 8 0 lockfspl 48 187 0 186 1 0 1 1 0 8 0 sessionpl 144 25 0 14 1 0 1 1 0 8 0 pgrppl 48 34 0 23 1 0 1 1 0 8 0 ucredpl 96 1967 0 1958 1 0 1 1 0 8 0 zombiepl 144 6303 0 6302 2 1 1 1 0 8 0 processpl 1080 6356 0 6302 4 0 4 4 0 8 0 procpl 672 13691 0 13629 6 0 6 6 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 42 0 42 5 5 0 1 0 8 0 sockpl 480 3423 0 3403 16 12 4 5 0 8 1 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 8 0 0 1 0 1 1 0 8 0 mcl9k 9216 14 0 0 1 0 1 1 0 8 0 mcl8k 8192 13 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 312 0 0 20 0 20 20 0 8 0 mtagpl 96 219 0 0 6 0 6 6 0 8 0 mbufpl 256 889 0 0 53 0 53 53 0 8 0 bufpl 280 11626 0 5360 448 0 448 448 0 8 0 anonpl 24 1638158 0 1628350 150 88 62 96 0 186 1 amapchunkpl 152 177076 0 176599 35 14 21 25 0 158 1 amappl16 200 13569 0 13312 61 47 14 34 0 8 0 amappl15 192 3111 0 3105 1 0 1 1 0 8 0 amappl14 184 8 0 5 2 1 1 1 0 8 0 amappl13 176 61 0 60 1 0 1 1 0 8 0 amappl12 168 50 0 41 1 0 1 1 0 8 0 amappl11 160 1547 0 1534 1 0 1 1 0 8 0 amappl10 152 666 0 658 1 0 1 1 0 8 0 amappl9 144 1186 0 1186 2 2 0 1 0 8 0 amappl8 136 503 0 424 3 0 3 3 0 8 0 amappl7 128 971 0 959 1 0 1 1 0 8 0 amappl6 120 762 0 742 1 0 1 1 0 8 0 amappl5 112 7474 0 7459 1 0 1 1 0 8 0 amappl4 104 820 0 788 1 0 1 1 0 8 0 amappl3 96 133 0 129 1 0 1 1 0 8 0 amappl2 88 572 0 523 2 0 2 2 0 8 0 amappl1 80 111550 0 111125 12 2 10 12 0 8 0 amappl 88 73960 0 73810 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 83 0 12 2 0 2 2 0 8 0 uaddrrnd 24 6339 0 6304 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6339 0 6304 1 0 1 1 0 8 0 vmmpekpl 168 33330 0 33293 2 0 2 2 0 8 0 vmmpepl 168 707252 0 705675 115 41 74 86 0 357 0 vmsppl 368 6338 0 6304 4 0 4 4 0 8 0 rwobjpl 56 123401 0 122398 27 12 15 19 0 8 0 pdppl 4096 12685 0 12627 81 21 60 61 0 8 2 pvpl 32 3569179 0 3555725 251 132 119 140 0 265 7 pmappl 232 6338 0 6304 4 1 3 3 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 406 0 54 11 0 11 11 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(fffffd806f91fd68,9,0) at witness_checkorder+0x108b rw_enter(fffffd806f91fd58,1) at rw_enter+0xd4 rrw_enter(fffffd806f91fd58,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd807b1a2390,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd807b1a2390,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd807b1a2390,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800022349270,fffffd807b1a2390,fffffd807f7d8a20,ffff800022375a50,ffff800022375a30) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800022349270,ffffffff823bae47,ffff800022375b38,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800022349270,ffffffff823bae47,ffff800022375b38,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800022349270,ffff800022375ba8,ffff800022375bf0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff800022375c70) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022375c70) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe321f5c2570, 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 __mp_lock(ffffffff8282c4d8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8282c4d8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 ktrstruct(ffff800022348a90,ffffffff823c72ef,ffff80002236fcf8,10) at ktrstruct+0xee sys_clock_gettime(ffff800022348a90,ffff80002236fd60,ffff80002236fdb0) at sys_clock_gettime+0xfb sys/kern/kern_time.c:171 syscall(ffff80002236fe30) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002236fe30) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe3e00, count: -8