witness: lock order reversal: 1st 0xfffffd806e944828 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806a1ef810 inode (&ip->i_lock) lock order data w2 -> w1 missing lock order data w1 -> w2 missing Stopped at db_enter+030: addq $010,%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+030 witness_checkorder(fffffd806a1ef810,9,0) at witness_checkorder+010363 rw_enter(fffffd806a1ef800,81) at rw_enter+0321 rrw_enter(fffffd806a1ef800,81) at rrw_enter+0213 VOP_LOCK(fffffd807bd85170,81) at VOP_LOCK+0207 vn_lock(fffffd807bd85170,81) at vn_lock+0204 uvn_get(fffffd806c3baf00,0,ffff80002229cbd8,ffff80002229cba8,0,0) at uvn_get+01126 uvm_fault_lower(ffff80002229cd40,ffff80002229cd78,ffff80002229ccc0,0) at uvm_fault_lower+01402 uvm_fault(fffffd8067cd92f0,20000000,0,2) at uvm_fault+01100 kpageflttrap(ffff80002229ced0,200000c0) at kpageflttrap+0775 kerntrap(ffff80002229ced0) at kerntrap+0357 alltraps_kern_meltdown() at alltraps_kern_meltdown+0173 copyout() at copyout+0123 syscall(ffff80002229d100) at syscall+02651 Xsyscall() at Xsyscall+0450 end of kernel end trace frame: 0xc8c8a4759e0, count: -15 ddb{0}> show registers rdi 01777774000004403160000 rsi 0247230 acpi_pdirpa+06400 rbp 01777774000004212344120 rbx 03 rdx 01777774000004403160000 rcx 0247227 acpi_pdirpa+06377 rax 01777777777760123235047 db_enter+027 r8 01777777777760124673114 witness_checkorder+010314 r9 05 r10 01062625353043633434230 r11 01442464252560565024455 r12 01777777730000266523700 r13 0 r14 0 r15 0 rip 01777777777760123235050 db_enter+030 cs 010 rflags 01106 rsp 01777774000004212344100 ss 020 db_enter+030: addq $010,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=6927 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff80002126a000,0xffff80002126a2b0 process=0xffff80002127f688 user=0xffff800022298000, vmspace=0xfffffd8067cd92f0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82017 260087 60522 0 2 0 syz-executor.1 82017 489709 60522 0 3 0x4000000 biowait syz-executor.1 12855 371407 60277 0 2 0 syz-executor.0 *12855 6927 60277 0 7 0x4000000 syz-executor.0 60522 219518 73880 0 3 0x82 nanoslp syz-executor.1 60277 234315 73880 0 3 0x82 nanoslp syz-executor.0 69885 500917 0 0 3 0x14280 nfsidl nfsio 2205 26641 0 0 3 0x14280 nfsidl nfsio 80278 322490 0 0 3 0x14280 nfsidl nfsio 20071 255728 0 0 3 0x14280 nfsidl nfsio 39495 183559 0 0 3 0x14280 nfsidl nfsio 51601 336419 0 0 3 0x14280 nfsidl nfsio 412 373833 0 0 3 0x14280 nfsidl nfsio 80569 170693 0 0 3 0x14280 nfsidl nfsio 56398 397807 0 0 3 0x14280 nfsidl nfsio 42821 508998 0 0 3 0x14280 nfsidl nfsio 293 301808 0 0 3 0x14280 nfsidl nfsio 99347 303424 0 0 3 0x14280 nfsidl nfsio 96834 445568 0 0 3 0x14280 nfsidl nfsio 53292 506584 0 0 3 0x14280 nfsidl nfsio 64215 275348 0 0 3 0x14280 nfsidl nfsio 57597 399910 0 0 3 0x14280 nfsidl nfsio 31597 467541 0 0 3 0x14280 nfsidl nfsio 40130 81500 0 0 3 0x14280 nfsidl nfsio 40325 219833 0 0 3 0x14280 nfsidl nfsio 16344 169327 0 0 3 0x14280 nfsidl nfsio 1537 435908 0 0 3 0x14200 acct acct 67253 105479 1 0 3 0x100083 ttyin getty 76203 438149 0 0 3 0x14200 bored sosplice 73880 349632 29537 0 3 0x82 thrsleep syz-fuzzer 73880 269164 29537 0 3 0x4000082 thrsleep syz-fuzzer 73880 206153 29537 0 3 0x4000082 thrsleep syz-fuzzer 73880 457042 29537 0 3 0x4000082 thrsleep syz-fuzzer 73880 417207 29537 0 3 0x4000082 kqread syz-fuzzer 73880 154035 29537 0 3 0x4000082 thrsleep syz-fuzzer 73880 316446 29537 0 3 0x4000082 thrsleep syz-fuzzer 73880 60601 29537 0 3 0x4000082 thrsleep syz-fuzzer 29537 504994 68546 0 3 0x10008a sigsusp ksh 68546 208245 97114 0 3 0x9a select sshd 97114 44959 1 0 3 0x88 select sshd 20456 480074 43913 74 3 0x100092 bpf pflogd 43913 193569 1 0 3 0x80 netio pflogd 46047 445376 14699 73 3 0x100090 kqread syslogd 14699 18079 1 0 3 0x100082 netio syslogd 22091 494621 1 0 3 0x100080 kqread resolvd 64043 5963 56440 77 3 0x100092 kqread dhcpleased 22452 18055 56440 77 3 0x100092 kqread dhcpleased 56440 117388 1 0 3 0x80 kqread dhcpleased 1233 213782 0 0 3 0x14200 bored smr 88332 382343 0 0 2 0x14200 zerothread 58859 96828 0 0 3 0x14200 aiodoned aiodoned 73665 72038 0 0 3 0x14200 syncer update 91341 402277 0 0 3 0x14200 cleaner cleaner 2964 382798 0 0 3 0x14200 reaper reaper 3363 79797 0 0 3 0x14200 pgdaemon pagedaemon 23694 44020 0 0 3 0x14200 bored crynlk 5580 252838 0 0 3 0x14200 bored crypto 11377 377360 0 0 3 0x14200 bored viomb 46922 388057 0 0 3 0x40014200 acpi0 acpi0 21947 389261 0 0 7 0x40014200 idle1 36316 320285 0 0 3 0x14200 bored softnet 24979 112421 0 0 3 0x14200 bored systqmp 39460 110508 0 0 3 0x14200 bored systq 19596 390342 0 0 3 0x40014200 bored softclock 20615 504064 0 0 3 0x40014200 idle0 1 521192 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 82017 (syz-executor.1) thread 0xffff80002126a540 (489709) exclusive rrwlock inode r = 0 (0xfffffd806a1ef3d0) #0 witness_lock+02260 #1 rw_enter+01742 #2 rrw_enter+0213 #3 ufs_ihashins+0105 #4 ffs_vget+0501 #5 ffs_inode_alloc+0703 #6 ufs_mkdir+0364 #7 VOP_MKDIR+0306 #8 domkdirat+0441 #9 syscall+02651 #10 Xsyscall+0450 exclusive rrwlock inode r = 0 (0xfffffd806a1efb40) #0 witness_lock+02260 #1 rw_enter+01742 #2 rrw_enter+0213 #3 VOP_LOCK+0207 #4 vn_lock+0204 #5 vfs_lookup+0335 #6 namei+02532 #7 domkdirat+0165 #8 syscall+02651 #9 Xsyscall+0450 Process 12855 (syz-executor.0) thread 0xffff80002126ad20 (6927) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8298ede8) #0 witness_lock+02260 #1 uvm_fault+01044 #2 kpageflttrap+0775 #3 kerntrap+0357 #4 alltraps_kern_meltdown+0173 #5 copyout+0123 #6 syscall+02651 #7 Xsyscall+0450 exclusive rwlock fdlock r = 0 (0xfffffd806e944828) #0 witness_lock+02260 #1 sys_socketpair+01017 #2 syscall+02651 #3 Xsyscall+0450 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10199 6455K 7395K 78643K 19023 0 pcb 13 8K 8K 78643K 367 0 rtable 111 11K 12K 78643K 839 0 ifaddr 85 15K 15K 78643K 277 0 sysctl 3 1K 1K 78643K 3 0 counters 44 34K 34K 78643K 106 0 ioctlops 0 0K 4K 78643K 1686 0 iov 0 0K 16K 78643K 275 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1220 77K 77K 78643K 3853 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 41 0 VM map 2 1K 1K 78643K 2 0 sem 10 1K 1K 78643K 16 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 6 17K 25K 78643K 8559 0 sigio 0 0K 0K 78643K 70 0 proc 70 87K 111K 78643K 826 0 subproc 32 2K 2K 78643K 187 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 585 0 in_multi 33 2K 2K 78643K 597 0 ether_multi 1 0K 0K 78643K 94 0 mrt 0 0K 0K 78643K 2 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 809 0 pfkey data 0 0K 0K 78643K 2 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 306 162K 162K 78643K 103178 0 UVM aobj 123 8K 8K 78643K 123 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 313 0 NDP 16 0K 0K 78643K 96 0 temp 147 4207K 4271K 78643K 91635 0 kqueue 10 14K 20K 78643K 351 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 120 246 0 243 1 0 1 1 0 8 0 rtentry 112 253 0 209 2 0 2 2 0 8 0 unpcb 120 1731 0 1693 10 8 2 2 0 8 0 syncache 296 87 0 87 12 12 0 1 0 8 0 tcpqe 32 80 0 80 15 15 0 1 0 8 0 tcpcb 736 1226 0 1222 31 30 1 5 0 8 0 arp 120 24 0 18 1 0 1 1 0 8 0 inpcb 304 3020 0 3013 18 17 1 2 0 8 0 nd6 48 61 0 55 1 0 1 1 0 8 0 pkpcb 40 50 0 50 8 8 0 1 0 8 0 kcovpl 48 11 0 9 1 0 1 1 0 8 0 ppxss 1248 5 0 5 2 2 0 1 0 8 0 pffrag 232 12 0 12 3 3 0 1 0 482 0 pffrnode 88 12 0 12 3 3 0 1 0 8 0 pffrent 40 29 0 29 3 3 0 1 0 8 0 pfosfp 40 1438 0 1007 5 0 5 5 0 8 0 pfosfpen 112 1438 0 714 21 0 21 21 0 8 0 pfstitem 24 95 0 92 1 0 1 1 0 8 0 pfstkey 112 95 0 92 1 0 1 1 0 8 0 pfstate 320 95 0 92 4 2 2 2 0 8 0 pfrule 1360 49 0 44 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1275 0 1083 15 3 12 13 0 8 0 art_table 32 1276 0 1083 2 0 2 2 0 8 0 art_node 16 252 0 212 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 8 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 120 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11635 0 10212 92 2 90 90 0 8 0 ffsino 272 11635 0 10212 97 1 96 96 0 8 0 nchpl 144 21829 0 20224 61 1 60 61 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 53212 0 53211 1 0 1 1 0 8 0 percpumem 16 65 0 31 1 0 1 1 0 8 0 vcpupl 1984 10 0 0 2 0 2 2 0 8 0 vmpool 560 12 0 2 1 0 1 1 0 8 0 scsiplug 72 4 0 4 1 1 0 1 0 8 0 scxspl 216 62492 0 62491 9 8 1 8 0 8 0 plimitpl 152 196 0 187 1 0 1 1 0 8 0 sigapl 424 8807 0 8750 8 1 7 7 0 8 0 futexpl 56 65315 0 65315 1 0 1 1 0 8 1 knotepl 112 69 0 0 2 0 2 2 0 8 0 kqueuepl 216 4347 0 4335 3 2 1 2 0 8 0 pipepl 336 501 0 491 14 12 2 2 0 8 0 fdescpl 496 8768 0 8749 3 0 3 3 0 8 0 filepl 152 27597 0 27480 7 2 5 6 0 8 0 lockfpl 104 775 0 772 1 0 1 1 0 8 0 lockfspl 48 313 0 310 1 0 1 1 0 8 0 sessionpl 144 28 0 17 1 0 1 1 0 8 0 pgrppl 48 58 0 47 1 0 1 1 0 8 0 ucredpl 96 2923 0 2909 1 0 1 1 0 8 0 zombiepl 144 8750 0 8750 1 0 1 1 0 8 1 processpl 1072 8807 0 8750 4 0 4 4 0 8 0 procpl 672 18713 0 18647 16 10 6 6 0 8 0 sosppl 168 66 0 66 9 9 0 1 0 8 0 sockpl 480 5055 0 4992 19 10 9 10 0 8 0 mcl64k 65536 21 0 0 3 1 2 3 0 8 0 mcl16k 16384 13 0 0 2 0 2 2 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 408 0 0 19 1 18 19 0 8 0 mtagpl 96 314 0 0 7 1 6 7 0 8 0 mbufpl 256 1115 0 0 55 1 54 55 0 8 0 bufpl 280 13904 0 7568 453 0 453 453 0 8 0 anonpl 24 2293162 0 2280757 191 110 81 98 0 186 2 amapchunkpl 152 245045 0 244544 50 30 20 31 0 158 0 amappl16 200 21637 0 21224 101 78 23 37 0 8 1 amappl15 192 642 0 642 3 3 0 1 0 8 0 amappl14 184 10 0 9 5 4 1 1 0 8 0 amappl13 176 1996 0 1994 1 0 1 1 0 8 0 amappl12 168 627 0 624 1 0 1 1 0 8 0 amappl11 160 43 0 29 1 0 1 1 0 8 0 amappl10 152 552 0 545 1 0 1 1 0 8 0 amappl9 144 2837 0 2835 1 0 1 1 0 8 0 amappl8 136 2717 0 2605 4 0 4 4 0 8 0 amappl7 128 2113 0 2093 1 0 1 1 0 8 0 amappl6 120 3032 0 3015 1 0 1 1 0 8 0 amappl5 112 8938 0 8917 1 0 1 1 0 8 0 amappl4 104 889 0 846 3 1 2 2 0 8 0 amappl3 96 924 0 921 1 0 1 1 0 8 0 amappl2 88 3283 0 3227 2 0 2 2 0 8 0 amappl1 80 146565 0 146110 13 3 10 13 0 8 0 amappl 88 102044 0 101882 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 64 122 0 0 2 0 2 2 0 8 0 uaddrrnd 24 8780 0 8751 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8780 0 8751 1 0 1 1 0 8 0 vmmpekpl 168 45332 0 45293 2 0 2 2 0 8 0 vmmpepl 168 984514 0 982583 195 110 85 105 0 357 0 vmsppl 368 8779 0 8751 3 0 3 3 0 8 0 rwobjpl 56 170144 0 168901 42 24 18 21 0 8 0 pdppl 4096 17568 0 17512 75 19 56 58 0 8 0 pvpl 32 4816804 0 4800513 352 208 144 165 0 265 10 pmappl 224 8779 0 8751 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 421 0 73 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+030 witness_checkorder(fffffd806a1ef810,9,0) at witness_checkorder+010363 rw_enter(fffffd806a1ef800,81) at rw_enter+0321 rrw_enter(fffffd806a1ef800,81) at rrw_enter+0213 VOP_LOCK(fffffd807bd85170,81) at VOP_LOCK+0207 vn_lock(fffffd807bd85170,81) at vn_lock+0204 uvn_get(fffffd806c3baf00,0,ffff80002229cbd8,ffff80002229cba8,0,0) at uvn_get+01126 uvm_fault_lower(ffff80002229cd40,ffff80002229cd78,ffff80002229ccc0,0) at uvm_fault_lower+01402 uvm_fault(fffffd8067cd92f0,20000000,0,2) at uvm_fault+01100 kpageflttrap(ffff80002229ced0,200000c0) at kpageflttrap+0775 kerntrap(ffff80002229ced0) at kerntrap+0357 alltraps_kern_meltdown() at alltraps_kern_meltdown+0173 copyout() at copyout+0123 syscall(ffff80002229d100) at syscall+02651 Xsyscall() at Xsyscall+0450 end of kernel end trace frame: 0xc8c8a4759e0, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+032: addq $010,%rsp ddb{1}> trace x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+032 x86_ipi_handler() at x86_ipi_handler+0267 Xresume_lapic_ipi() at Xresume_lapic_ipi+043 acpicpu_idle() at acpicpu_idle+01353 sched_idle(ffff800020d38ff0) at sched_idle+02027 end trace frame: 0x0, count: -5