witness: lock order reversal: 1st 0xfffffd807a14ba18 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd807a1aff78 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(fffffd807a1aff78,9,0) at witness_checkorder+0x108b rw_enter(fffffd807a1aff68,1) at rw_enter+0xd4 rrw_enter(fffffd807a1aff68,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80661b5a28,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80661b5a28,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd80661b5a28,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800021270540,fffffd80661b5a28,fffffd807f7d89c0,ffff8000222d6ec0,ffff8000222d6ea0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021270540,ffffffff823bb5b9,ffff8000222d6fa8,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021270540,ffffffff823bb5b9,ffff8000222d6fa8,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800021270540,ffff8000222d7018,ffff8000222d7060) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000222d70e0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000222d70e0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3ac4695e250, count: -12 ddb{0}> show registers rdi 0xffff80002129e000 rsi 0xca20 __ALIGN_SIZE+0xba20 rbp 0xffff8000222d6ad0 rbx 0x3 rdx 0xffff80002129e000 rcx 0xca1f __ALIGN_SIZE+0xba1f rax 0xffffffff812aeb47 db_enter+0x17 r8 0xffffffff815a31b1 witness_checkorder+0x1061 r9 0x5 r10 0x6d963031ca1dd490 r11 0x44aafa0d33dc2418 r12 0 r13 0xfffffd807a1aff78 r14 0 r15 0xfffffd8002cfc740 rip 0xffffffff812aeb48 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000222d6ac0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=48440 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800021270d20,0xffff800021270fd0 process=0xffff800021224880 user=0xffff8000222d2000, vmspace=0xfffffd80084da730 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82679 259213 49581 0 2 0 syz-executor.1 82679 128836 49581 0 3 0x4000080 fsleep syz-executor.1 87263 202716 72065 0 7 0x1 syz-executor.0 *87263 48440 72065 0 7 0x4000001 syz-executor.0 87263 25146 72065 0 2 0x4000000 syz-executor.0 8310 361691 0 0 3 0x14200 bored sosplice 49581 16172 8984 0 3 0x82 nanoslp syz-executor.1 72065 65979 8984 0 3 0x82 nanoslp syz-executor.0 8984 430549 15660 0 3 0x82 thrsleep syz-fuzzer 8984 58515 15660 0 3 0x4000082 thrsleep syz-fuzzer 8984 220648 15660 0 3 0x4000082 thrsleep syz-fuzzer 8984 87147 15660 0 3 0x4000082 thrsleep syz-fuzzer 8984 367129 15660 0 3 0x4000082 thrsleep syz-fuzzer 8984 146819 15660 0 3 0x4000082 kqread syz-fuzzer 8984 400279 15660 0 3 0x4000082 thrsleep syz-fuzzer 8984 345816 15660 0 3 0x4000082 thrsleep syz-fuzzer 15660 312984 18220 0 3 0x10008a sigsusp ksh 18220 188810 57276 0 3 0x92 select sshd 4101 62967 1 0 3 0x100083 ttyin getty 57276 306447 1 0 3 0x80 select sshd 23767 25317 57272 74 3 0x100092 bpf pflogd 57272 163329 1 0 3 0x80 netio pflogd 46591 181367 14220 73 3 0x100090 kqread syslogd 14220 145262 1 0 3 0x100082 netio syslogd 58095 264473 1 77 3 0x100090 poll dhclient 30256 249475 1 0 3 0x80 poll dhclient 61992 317733 0 0 3 0x14200 bored smr 91048 415514 0 0 2 0x14200 zerothread 42123 464321 0 0 3 0x14200 aiodoned aiodoned 34507 483289 0 0 3 0x14200 syncer update 20188 126533 0 0 3 0x14200 cleaner cleaner 76166 378893 0 0 3 0x14200 reaper reaper 92276 241548 0 0 3 0x14200 pgdaemon pagedaemon 89212 424528 0 0 3 0x14200 bored crynlk 60523 461297 0 0 3 0x14200 bored crypto 60696 499077 0 0 3 0x14200 bored viomb 31179 476682 0 0 3 0x40014200 acpi0 acpi0 87262 294195 0 0 3 0x40014200 idle1 73389 384989 0 0 3 0x14200 bored softnet 83629 383828 0 0 3 0x14200 bored systqmp 21572 57010 0 0 3 0x14200 bored systq 38974 498740 0 0 3 0x40014200 bored softclock 83651 271667 0 0 3 0x40014200 idle0 1 164857 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 87263 (syz-executor.0) thread 0xffff800021270540 (48440) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8290d068) #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 (0xfffffd807a14ba18) #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 10155 6495K 7071K 78643K 12465 0 pcb 13 8K 8K 78643K 148 0 rtable 89 2K 3K 78643K 380 0 ifaddr 65 13K 13K 78643K 112 0 counters 46 34K 34K 78643K 62 0 ioctlops 0 0K 4K 78643K 1488 0 iov 0 0K 2K 78643K 30 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1216 76K 77K 78643K 1673 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 114 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 6 17K 25K 78643K 1678 0 proc 60 63K 83K 78643K 548 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 163 0 in_multi 30 2K 2K 78643K 168 0 ether_multi 1 0K 0K 78643K 31 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 366 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 189 26K 30K 78643K 21411 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 65 0 NDP 11 0K 0K 78643K 31 0 temp 125 3982K 4046K 78643K 6071 0 kqueue 3 4K 8K 78643K 52 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 51 0 49 1 0 1 1 0 8 0 rtentry 112 54 0 18 2 0 2 2 0 8 0 unpcb 120 213 0 198 1 0 1 1 0 8 0 syncache 296 31 0 31 2 2 0 1 0 8 0 tcpqe 32 25 0 25 2 2 0 1 0 8 0 tcpcb 736 296 0 292 9 7 2 5 0 8 1 arp 120 7 0 0 1 0 1 1 0 8 0 inpcb 304 800 0 784 2 0 2 2 0 8 0 nd6 48 14 0 8 1 0 1 1 0 8 0 pkpcb 40 37 0 37 3 2 1 1 0 8 1 kcovpl 48 2 0 0 1 0 1 1 0 8 0 ppxss 1128 5 0 4 1 0 1 1 0 8 0 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 13 0 12 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 35 0 12 1 0 1 1 0 8 0 pfstkey 112 35 0 12 1 0 1 1 0 8 0 pfstate 320 35 0 12 3 0 3 3 0 8 0 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 256 190 0 41 12 1 11 12 0 8 0 art_table 32 191 0 41 2 0 2 2 0 8 0 art_node 16 53 0 23 1 0 1 1 0 8 0 semupl 112 10 0 10 1 1 0 1 0 8 0 semapl 112 112 0 102 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3459 0 2057 89 1 88 89 0 8 0 ffsino 272 3459 0 2057 94 0 94 94 0 8 0 nchpl 144 5479 0 3867 60 0 60 60 0 8 0 uvmvnodes 72 3810 0 0 70 0 70 70 0 8 0 vnodes 224 3810 0 0 225 0 225 225 0 8 0 namei 1024 13360 0 13360 1 0 1 1 0 8 1 percpumem 16 42 0 8 1 0 1 1 0 8 0 scxspl 216 15971 0 15970 9 8 1 8 0 8 0 plimitpl 152 67 0 59 1 0 1 1 0 8 0 sigapl 424 1894 0 1860 4 0 4 4 0 8 0 futexpl 56 10688 0 10687 1 0 1 1 0 8 0 knotepl 112 108 0 88 1 0 1 1 0 8 0 kqueuepl 168 734 0 732 1 0 1 1 0 8 0 pipepl 336 96 0 85 3 2 1 2 0 8 0 fdescpl 496 1877 0 1860 3 0 3 3 0 8 0 filepl 152 5753 0 5646 5 0 5 5 0 8 0 lockfpl 104 110 0 109 1 0 1 1 0 8 0 lockfspl 48 53 0 52 1 0 1 1 0 8 0 sessionpl 144 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 539 0 530 1 0 1 1 0 8 0 zombiepl 144 1860 0 1860 1 0 1 1 0 8 1 processpl 1080 1894 0 1860 3 0 3 3 0 8 0 procpl 672 3856 0 3812 4 0 4 4 0 8 0 sosppl 168 12 0 12 2 2 0 1 0 8 0 sockpl 480 1102 0 1079 6 2 4 4 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 170 0 0 16 0 16 16 0 8 0 mtagpl 96 80 0 0 2 0 2 2 0 8 0 mbufpl 256 501 0 0 29 0 29 29 0 8 0 bufpl 280 5115 0 154 355 0 355 355 0 8 0 anonpl 24 459133 0 451521 52 0 52 52 0 186 5 amapchunkpl 152 50466 0 50047 22 3 19 19 0 158 2 amappl16 200 3071 0 2875 12 1 11 11 0 8 0 amappl15 192 61 0 55 1 0 1 1 0 8 0 amappl14 184 2 0 2 1 1 0 1 0 8 0 amappl13 176 26 0 24 1 0 1 1 0 8 0 amappl12 168 843 0 833 1 0 1 1 0 8 0 amappl11 160 46 0 34 1 0 1 1 0 8 0 amappl10 152 854 0 845 1 0 1 1 0 8 0 amappl9 144 152 0 152 1 1 0 1 0 8 0 amappl8 136 335 0 295 2 0 2 2 0 8 0 amappl7 128 56 0 45 1 0 1 1 0 8 0 amappl6 120 951 0 935 1 0 1 1 0 8 0 amappl5 112 2046 0 2033 1 0 1 1 0 8 0 amappl4 104 1357 0 1330 1 0 1 1 0 8 0 amappl3 96 57 0 52 1 0 1 1 0 8 0 amappl2 88 431 0 382 2 0 2 2 0 8 0 amappl1 80 33862 0 33425 13 3 10 12 0 8 0 amappl 88 21070 0 20939 5 1 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1877 0 1860 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1877 0 1860 1 0 1 1 0 8 0 vmmpekpl 168 11011 0 10978 2 0 2 2 0 8 0 vmmpepl 168 207487 0 205947 68 0 68 68 0 357 1 vmsppl 368 1876 0 1860 2 0 2 2 0 8 0 rwobjpl 56 37146 0 36255 15 2 13 13 0 8 0 pdppl 4096 3761 0 3720 57 16 41 45 0 8 0 pvpl 32 1020919 0 1009917 145 40 105 129 0 265 12 pmappl 232 1876 0 1860 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 325 0 30 9 0 9 9 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(fffffd807a1aff78,9,0) at witness_checkorder+0x108b rw_enter(fffffd807a1aff68,1) at rw_enter+0xd4 rrw_enter(fffffd807a1aff68,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80661b5a28,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80661b5a28,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd80661b5a28,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800021270540,fffffd80661b5a28,fffffd807f7d89c0,ffff8000222d6ec0,ffff8000222d6ea0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021270540,ffffffff823bb5b9,ffff8000222d6fa8,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021270540,ffffffff823bb5b9,ffff8000222d6fa8,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800021270540,ffff8000222d7018,ffff8000222d7060) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000222d70e0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000222d70e0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3ac4695e250, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x37 kd_curproc sys/dev/kcov.c:570 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x37 sys/dev/kcov.c:143 __mp_lock(ffffffff8290ce60) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8290ce60) at __mp_lock+0x133 sys/kern/kern_lock.c:147 ktrstruct(ffff8000212707e0,ffffffff823c9c9e,ffff8000234c1488,10) at ktrstruct+0xee sys_clock_gettime(ffff8000212707e0,ffff8000234c14f0,ffff8000234c1540) at sys_clock_gettime+0xfb sys/kern/kern_time.c:171 syscall(ffff8000234c15c0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000234c15c0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffca130, count: -9