witness: lock order reversal: 1st 0xfffffd806f22b820 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80653e1e70 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:440 witness_checkorder(fffffd80653e1e70,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80653e1e70,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80653e1e60,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80653e1e60,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806e492788,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806e492788,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd806e497168,0,ffff8000256998d8,ffff8000256998a8,0,0,d7d2d69d29f73420,ffffffff82375f30) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd806e497168,0,ffff8000256998d8,ffff8000256998a8,0,0,d7d2d69d29f73420,ffffffff82375f30) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800025699a40,ffff800025699a78,ffff8000256999c0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd8008596000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800025699bd0,20000100) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800025699bd0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800025699e00) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800025699e00) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x559a48f1c00, count: -15 ddb{0}> show registers rdi 0xffff80002368a000 rsi 0x6e6a __ALIGN_SIZE+0x5e6a rbp 0xffff800025699550 rbx 0x3 rdx 0xffff80002368a000 rcx 0x6e69 __ALIGN_SIZE+0x5e69 rax 0xffffffff819c7707 db_enter+0x17 r8 0xffffffff81c464dc witness_checkorder+0x10cc r9 0x5 r10 0xbbdc178522196f6 r11 0x3c71538b94a4f873 r12 0xfffffd8002dbf880 r13 0 r14 0 r15 0 rip 0xffffffff819c7708 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800025699540 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=69298 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021238d20,0xffff8000212382b0 process=0xffff8000ffff9d58 user=0xffff800025694000, vmspace=0xfffffd8008596000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 69460 121786 11290 32767 7 0x10 syz-executor.0 69460 148402 11290 32767 2 0x4000010 syz-executor.0 *69460 69298 11290 32767 7 0x4000010 syz-executor.0 69460 13229 11290 32767 2 0x4000010 syz-executor.0 11290 218995 99420 32767 3 0x90 nanoslp syz-executor.0 99420 352712 9613 0 3 0x82 wait syz-executor.0 85144 196138 0 0 3 0x14200 bored sosplice 17371 163599 6719 32767 3 0x10 biowait syz-executor.1 6719 115499 9613 0 3 0x82 wait syz-executor.1 9613 143663 75984 0 3 0x82 thrsleep syz-fuzzer 9613 399203 75984 0 3 0x4000082 nanoslp syz-fuzzer 9613 362589 75984 0 3 0x4000082 thrsleep syz-fuzzer 9613 317675 75984 0 3 0x4000082 thrsleep syz-fuzzer 9613 354445 75984 0 3 0x4000082 thrsleep syz-fuzzer 9613 444949 75984 0 3 0x4000082 thrsleep syz-fuzzer 9613 335691 75984 0 3 0x4000082 kqread syz-fuzzer 9613 272238 75984 0 3 0x4000082 nanoslp syz-fuzzer 75984 326361 35859 0 3 0x10008a sigsusp ksh 35859 189632 96878 0 3 0x9a select sshd 53322 93136 1 0 3 0x100083 ttyin getty 96878 362373 1 0 3 0x88 select sshd 14597 494429 7652 73 3 0x100090 kqread syslogd 7652 181082 1 0 3 0x100082 netio syslogd 14410 112788 1 0 3 0x100080 kqread resolvd 685 71481 44203 77 3 0x100092 kqread dhcpleased 74988 517115 44203 77 3 0x100092 kqread dhcpleased 44203 157502 1 0 3 0x80 kqread dhcpleased 30386 98237 0 0 3 0x14200 bored smr 16975 346713 0 0 2 0x14200 zerothread 67575 142964 0 0 3 0x14200 aiodoned aiodoned 10975 463089 0 0 3 0x14200 syncer update 14855 11376 0 0 3 0x14200 cleaner cleaner 24016 397048 0 0 3 0x14200 reaper reaper 10081 77610 0 0 3 0x14200 pgdaemon pagedaemon 38695 206033 0 0 3 0x14200 bored crynlk 46104 311241 0 0 3 0x14200 bored crypto 21844 61302 0 0 3 0x14200 bored viomb 37413 276665 0 0 3 0x40014200 acpi0 acpi0 69004 246185 0 0 3 0x40014200 idle1 55444 284684 0 0 3 0x14200 bored softnet 20380 55524 0 0 3 0x14200 bored systqmp 40827 508336 0 0 3 0x14200 bored systq 64176 415671 0 0 3 0x40014200 bored softclock 8563 62190 0 0 3 0x40014200 idle0 1 401184 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 69460 (syz-executor.0) thread 0xffff8000212387e0 (69298) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829e65f8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvm_fault+0x224 sys/uvm/uvm_fault.c:637 #2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 #3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #4 alltraps_kern_meltdown+0x7b #5 copyout+0x53 #6 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #7 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd806f22b820) #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+0x20f #2 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #3 Xsyscall+0x128 Process 17371 (syz-executor.1) thread 0xffff800021239a40 (163599) exclusive rrwlock inode r = 0 (0xfffffd80653e12c0) #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+0x3e2 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1350 #5 ffs_inode_alloc+0x1c3 sys/ufs/ffs/ffs_alloc.c:394 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3070 #9 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ad4e2b8) #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+0x3e2 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b 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+0xdd sys/kern/vfs_lookup.c:413 #6 namei+0x55a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3055 #8 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10117 6407K 6433K 78643K 11228 0 pcb 13 8K 8K 78643K 13 0 rtable 110 3K 3K 78643K 546 0 ifaddr 39 10K 10K 78643K 92 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 58 0 ioctlops 0 0K 2K 78643K 213 0 iov 0 0K 24K 78643K 311 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1217 77K 77K 78643K 1431 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 30 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 9103 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 18582 0 sigio 0 0K 0K 78643K 47 0 proc 56 74K 99K 78643K 657 0 subproc 34 2K 2K 78643K 153 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 571 0 in_multi 33 2K 2K 78643K 333 0 ether_multi 1 0K 0K 78643K 35 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 2K 78643K 1260 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 384 52K 56K 78643K 227800 0 UVM aobj 71 7K 7K 78643K 107 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 258 0 NDP 5 0K 0K 78643K 30 0 temp 102 4213K 4277K 78643K 40336 0 kqueue 11 14K 22K 78643K 319 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 22 0 0 1 0 1 1 0 8 0 rtpcb 120 308 0 305 1 0 1 1 0 8 0 rtentry 112 129 0 83 2 0 2 2 0 8 0 unpcb 120 5023 0 4999 2 1 1 2 0 8 0 syncache 296 120 0 120 11 11 0 1 0 8 0 tcpqe 32 418 0 418 10 10 0 1 0 8 0 tcpcb 736 1663 0 1659 19 18 1 6 0 8 0 arp 120 23 0 17 1 0 1 1 0 8 0 ipq 40 5 0 5 1 1 0 1 0 8 0 ipqe 40 220 0 220 1 1 0 1 0 8 0 inpcb 304 3174 0 3167 7 6 1 3 0 8 0 ip6q 72 12 0 12 3 3 0 1 0 8 0 ip6af 40 31 0 31 3 3 0 1 0 8 0 nd6 48 31 0 23 1 0 1 1 0 8 0 kcovpl 48 9 0 7 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 571 0 350 16 2 14 16 0 8 0 art_table 32 572 0 350 3 1 2 3 0 8 0 art_node 16 128 0 86 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 28 1 1 0 1 0 8 0 semapl 112 9101 0 9091 1 0 1 1 0 8 0 shmpl 112 104 0 36 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 21254 0 19847 96 7 89 89 0 8 0 ffsino 272 21254 0 19847 95 0 95 95 0 8 0 nchpl 144 43776 0 42176 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 97209 0 97208 1 0 1 1 0 8 0 percpumem 16 41 0 7 1 0 1 1 0 8 0 scxspl 216 125009 0 125008 15 14 1 7 0 8 0 plimitpl 152 188 0 178 1 0 1 1 0 8 0 sigapl 424 18784 0 18749 7 2 5 5 0 8 0 futexpl 56 194862 0 194862 1 0 1 1 0 8 1 knotepl 112 57 0 0 2 0 2 2 0 8 0 kqueuepl 216 29519 0 29475 13 10 3 3 0 8 0 pipepl 336 1595 0 1584 12 10 2 2 0 8 1 fdescpl 496 18767 0 18749 3 0 3 3 0 8 0 filepl 152 72907 0 72783 11 5 6 7 0 8 1 lockfpl 104 1160 0 1157 1 0 1 1 0 8 0 lockfspl 48 392 0 389 1 0 1 1 0 8 0 sessionpl 144 24 0 14 1 0 1 1 0 8 0 pgrppl 48 56 0 46 1 0 1 1 0 8 0 ucredpl 96 2329 0 2317 1 0 1 1 0 8 0 zombiepl 144 18749 0 18749 1 0 1 1 0 8 1 processpl 1072 18784 0 18749 3 0 3 3 0 8 0 procpl 672 40765 0 40720 16 11 5 5 0 8 1 sosppl 168 122 0 122 12 12 0 1 0 8 0 sockpl 480 8596 0 8562 8 3 5 6 0 8 0 mcl64k 65536 13 0 0 2 0 2 2 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 18 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 3 1 2 3 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 660 0 0 32 0 32 32 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1015 0 0 57 0 57 57 0 8 0 bufpl 280 25319 0 18987 453 0 453 453 0 8 0 anonpl 24 4832632 0 4805983 281 106 175 176 0 186 0 amapchunkpl 152 528245 0 527262 78 38 40 50 0 158 1 amappl16 200 38465 0 37527 133 83 50 51 0 8 0 amappl15 192 17 0 17 3 3 0 1 0 8 0 amappl14 184 11 0 8 1 0 1 1 0 8 0 amappl13 176 5322 0 5319 1 0 1 1 0 8 0 amappl12 168 8 0 5 1 0 1 1 0 8 0 amappl11 160 4309 0 4299 1 0 1 1 0 8 0 amappl10 152 63 0 53 1 0 1 1 0 8 0 amappl9 144 8805 0 8801 1 0 1 1 0 8 0 amappl8 136 990 0 847 5 0 5 5 0 8 0 amappl7 128 397 0 382 1 0 1 1 0 8 0 amappl6 120 8965 0 8942 1 0 1 1 0 8 0 amappl5 112 19150 0 19131 1 0 1 1 0 8 0 amappl4 104 5257 0 5221 1 0 1 1 0 8 0 amappl3 96 943 0 941 1 0 1 1 0 8 0 amappl2 88 6037 0 5977 2 0 2 2 0 8 0 amappl1 80 315504 0 315066 12 2 10 12 0 8 0 amappl 88 221383 0 221156 6 0 6 6 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 64 106 0 36 2 0 2 2 0 8 0 uaddrrnd 24 18767 0 18749 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 18767 0 18749 1 0 1 1 0 8 0 vmmpekpl 168 97390 0 97365 2 0 2 2 0 8 0 vmmpepl 168 2151443 0 2148891 211 94 117 137 0 357 4 vmsppl 368 18766 0 18749 2 0 2 2 0 8 0 rwobjpl 56 362825 0 361007 51 24 27 27 0 8 1 pdppl 4096 37542 0 37498 77 31 46 50 0 8 2 pvpl 32 11337110 0 11306803 452 190 262 269 0 265 0 pmappl 224 18766 0 18749 2 0 2 2 0 8 1 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 426 0 72 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:440 witness_checkorder(fffffd80653e1e70,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80653e1e70,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80653e1e60,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80653e1e60,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806e492788,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806e492788,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd806e497168,0,ffff8000256998d8,ffff8000256998a8,0,0,d7d2d69d29f73420,ffffffff82375f30) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd806e497168,0,ffff8000256998d8,ffff8000256998a8,0,0,d7d2d69d29f73420,ffffffff82375f30) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800025699a40,ffff800025699a78,ffff8000256999c0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd8008596000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800025699bd0,20000100) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800025699bd0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800025699e00) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800025699e00) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x559a48f1c00, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 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: 0x7f7ffffc88c0, count: -3