witness: lock order reversal: 1st 0xfffffd807f7d6248 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806adf52b8 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd806adf52b8,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806adf52b8,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd806adf52a8,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd806adf52a8,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806e164170,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806e164170,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd806e1465e8,0,ffff800021292a38,ffff800021292a08,0,2,691ba5140742fecf,ffffffff82273fc0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd806e1465e8,0,ffff800021292a38,ffff800021292a08,0,2,691ba5140742fecf,ffffffff82273fc0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800021292ba0,ffff800021292bd8,ffff800021292b20,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807effc2e0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800021292d30,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800021292d30) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800021292f60) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021292f60) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xda270388f10, count: -15 ddb{1}> show registers rdi 0xffff80002269a000 rsi 0x6cd3 __ALIGN_SIZE+0x5cd3 rbp 0xffff8000212926b0 rbx 0x3 rdx 0xffff80002269a000 rcx 0x6cd2 __ALIGN_SIZE+0x5cd2 rax 0xffffffff81a1fd37 db_enter+0x17 r8 0xffffffff814a08dc witness_checkorder+0x10cc r9 0x5 r10 0x8e031d98adb4425b r11 0x5bf9b1bfc8e41542 r12 0xfffffd8002dc1900 r13 0 r14 0 r15 0 rip 0xffffffff81a1fd38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212926a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=84163 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff80002127ba40,0xffffffff82a0ce28 process=0xffff8000ffff90c8 user=0xffff80002128e000, vmspace=0xfffffd807effc2e0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 29933 164394 36896 0 7 0 syz-executor.0 *29933 84163 36896 0 7 0x4000000 syz-executor.0 36896 407684 13077 0 3 0x82 nanoslp syz-executor.0 93696 163085 13077 0 3 0x82 nanoslp syz-executor.1 40459 190365 0 0 3 0x14200 acct acct 95435 314347 1 0 3 0x100083 ttyin getty 30521 27951 0 0 3 0x14200 bored sosplice 13077 519150 47014 0 3 0x82 thrsleep syz-fuzzer 13077 40019 47014 0 3 0x4000082 nanoslp syz-fuzzer 13077 524076 47014 0 3 0x4000082 thrsleep syz-fuzzer 13077 63301 47014 0 3 0x4000082 thrsleep syz-fuzzer 13077 318295 47014 0 3 0x4000082 kqread syz-fuzzer 13077 409170 47014 0 3 0x4000082 thrsleep syz-fuzzer 13077 190723 47014 0 3 0x4000082 nanoslp syz-fuzzer 13077 327651 47014 0 3 0x4000082 thrsleep syz-fuzzer 47014 480982 88436 0 3 0x10008a sigsusp ksh 88436 239552 49954 0 3 0x9a select sshd 49954 100131 1 0 3 0x88 select sshd 55075 446857 55867 74 3 0x100092 bpf pflogd 55867 2179 1 0 3 0x80 netio pflogd 53787 234360 91718 73 3 0x100090 kqread syslogd 91718 318976 1 0 3 0x100082 netio syslogd 41026 154583 1 0 3 0x100080 kqread resolvd 79850 171212 67299 77 3 0x100092 kqread dhcpleased 89837 419227 67299 77 3 0x100092 kqread dhcpleased 67299 127439 1 0 3 0x80 kqread dhcpleased 43381 401453 0 0 3 0x14200 bored smr 95182 69534 0 0 3 0x14200 pgzero zerothread 22123 188938 0 0 3 0x14200 aiodoned aiodoned 45611 359413 0 0 3 0x14200 syncer update 7619 386444 0 0 3 0x14200 cleaner cleaner 45864 204289 0 0 3 0x14200 reaper reaper 32449 103400 0 0 3 0x14200 pgdaemon pagedaemon 50036 468568 0 0 3 0x14200 bored crynlk 61592 263104 0 0 3 0x14200 bored crypto 98259 212502 0 0 3 0x14200 bored viomb 26996 349361 0 0 3 0x40014200 acpi0 acpi0 58189 421 0 0 3 0x40014200 idle1 53220 466544 0 0 3 0x14200 bored softnet 84131 42905 0 0 3 0x14200 bored systqmp 83963 55890 0 0 3 0x14200 bored systq 42465 242694 0 0 3 0x40014200 bored softclock 86223 192695 0 0 3 0x40014200 idle0 1 304654 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 29933 (syz-executor.0) thread 0xffff80002127a000 (84163) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829a44f8) #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 (0xfffffd807f7d6248) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10186 6575K 7219K 78643K 16712 0 pcb 13 8K 8K 78643K 240 0 rtable 93 3K 5K 78643K 604 0 ifaddr 79 15K 15K 78643K 233 0 sysctl 2 0K 0K 78643K 9 0 counters 44 34K 34K 78643K 84 0 ioctlops 0 0K 4K 78643K 1711 0 iov 0 0K 16K 78643K 294 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1220 77K 77K 78643K 3070 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 29 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 258 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 8011 0 sigio 0 0K 0K 78643K 51 0 proc 71 87K 111K 78643K 759 0 subproc 32 2K 2K 78643K 136 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 300 0 in_multi 33 2K 2K 78643K 297 0 ether_multi 1 0K 0K 78643K 45 0 mrt 1 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 2K 78643K 648 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 269 56K 71K 78643K 97536 0 UVM aobj 39 4K 4K 78643K 41 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 244 0 NDP 14 0K 0K 78643K 64 0 temp 138 4210K 4322K 78643K 77333 0 kqueue 10 14K 24K 78643K 350 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 120 167 0 164 1 0 1 1 0 8 0 rtentry 112 129 0 93 2 0 2 2 0 8 0 unpcb 120 2314 0 2268 3 1 2 3 0 8 0 syncache 296 47 0 47 6 6 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 304 0 304 10 10 0 1 0 8 0 tcpcb 736 950 0 946 18 17 1 4 0 8 0 arp 120 18 0 12 1 0 1 1 0 8 0 inpcb 304 2472 0 2465 13 12 1 2 0 8 0 rttmr 72 2 0 2 1 1 0 1 0 8 0 nd6 48 39 0 33 1 0 1 1 0 8 0 pkpcb 40 28 0 28 5 5 0 1 0 8 0 kcovpl 48 8 0 6 1 0 1 1 0 8 0 ppxss 1248 5 0 5 2 2 0 1 0 8 0 pffrag 232 27 0 23 5 4 1 1 0 482 0 pffrnode 88 27 0 23 5 4 1 1 0 8 0 pffrent 40 947 0 943 6 5 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 pfrktable 1344 44 0 44 2 2 0 1 0 8 0 pfstitem 24 89 0 87 1 0 1 1 0 8 0 pfstkey 112 89 0 87 2 1 1 2 0 8 0 pfstate 320 89 0 87 5 4 1 5 0 8 0 pfrule 1360 132 0 116 3 1 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 589 0 406 18 6 12 14 0 8 0 art_table 32 590 0 406 2 0 2 2 0 8 0 art_node 16 128 0 98 1 0 1 1 0 8 0 sysvmsgpl 40 69 0 30 1 0 1 1 0 8 0 semupl 112 10 0 10 1 1 0 1 0 8 0 semapl 112 256 0 246 1 0 1 1 0 8 0 shmpl 112 38 0 2 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 10848 0 9429 90 1 89 90 0 8 0 ffsino 272 10848 0 9429 96 1 95 96 0 8 0 nchpl 144 20102 0 18499 61 0 61 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 48988 0 48988 1 0 1 1 0 8 1 percpumem 16 54 0 20 1 0 1 1 0 8 0 vcpupl 2048 2 0 0 1 0 1 1 0 8 0 vmpool 560 2 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 13 0 13 1 1 0 1 0 8 0 scxspl 216 59281 0 59281 11 10 1 8 0 8 1 plimitpl 152 197 0 188 1 0 1 1 0 8 0 sigapl 424 8247 0 8211 6 1 5 5 0 8 0 futexpl 56 54578 0 54578 1 0 1 1 0 8 1 knotepl 112 71 0 0 2 0 2 2 0 8 0 kqueuepl 216 6350 0 6340 4 3 1 2 0 8 0 pipepl 336 464 0 454 15 13 2 2 0 8 0 fdescpl 496 8229 0 8211 3 0 3 3 0 8 0 filepl 152 27613 0 27498 8 3 5 7 0 8 0 lockfpl 104 736 0 733 1 0 1 1 0 8 0 lockfspl 48 278 0 275 1 0 1 1 0 8 0 sessionpl 144 25 0 14 1 0 1 1 0 8 0 pgrppl 48 30 0 19 1 0 1 1 0 8 0 ucredpl 96 2806 0 2787 1 0 1 1 0 8 0 zombiepl 144 8211 0 8210 1 0 1 1 0 8 0 processpl 1072 8247 0 8210 3 0 3 3 0 8 0 procpl 672 17992 0 17947 10 5 5 5 0 8 0 sosppl 168 100 0 100 7 7 0 1 0 8 0 sockpl 480 5011 0 4955 18 10 8 11 0 8 0 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 3 1 2 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 13 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 33 0 0 4 1 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 435 0 0 29 1 28 28 0 8 0 mtagpl 96 254 0 0 6 0 6 6 0 8 0 mbufpl 256 1113 0 0 51 0 51 51 0 8 0 bufpl 280 13233 0 6905 453 0 453 453 0 8 0 anonpl 24 2124096 0 2112182 164 84 80 116 0 186 5 amapchunkpl 152 233239 0 232675 73 36 37 37 0 158 14 amappl16 200 16166 0 15855 54 36 18 40 0 8 1 amappl15 192 898 0 893 1 0 1 1 0 8 0 amappl14 184 3 0 1 2 1 1 1 0 8 0 amappl13 176 78 0 77 1 0 1 1 0 8 0 amappl12 168 2133 0 2131 1 0 1 1 0 8 0 amappl11 160 2155 0 2136 1 0 1 1 0 8 0 amappl10 152 1182 0 1178 1 0 1 1 0 8 0 amappl9 144 925 0 922 1 0 1 1 0 8 0 amappl8 136 1423 0 1340 3 0 3 3 0 8 0 amappl7 128 919 0 909 1 0 1 1 0 8 0 amappl6 120 968 0 959 1 0 1 1 0 8 0 amappl5 112 7966 0 7944 1 0 1 1 0 8 0 amappl4 104 4983 0 4955 1 0 1 1 0 8 0 amappl3 96 2573 0 2554 1 0 1 1 0 8 0 amappl2 88 549 0 508 2 1 1 2 0 8 0 amappl1 80 142081 0 141635 13 3 10 13 0 8 0 amappl 88 96556 0 96393 5 0 5 5 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 40 0 2 1 0 1 1 0 8 0 uaddrrnd 24 8231 0 8211 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8231 0 8211 1 0 1 1 0 8 0 vmmpekpl 168 45859 0 45834 2 0 2 2 0 8 0 vmmpepl 168 921079 0 919387 152 72 80 97 0 357 1 vmsppl 368 8230 0 8211 2 0 2 2 0 8 0 rwobjpl 56 158988 0 157883 27 10 17 22 0 8 1 pdppl 4096 16469 0 16424 64 17 47 49 0 8 2 pvpl 32 4646443 0 4631039 304 164 140 189 0 265 10 pmappl 224 8230 0 8211 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 408 0 61 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82839ff0) 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 __mp_lock(ffffffff829a42f0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829a42f0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7fffffadb0, count: -6 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd806adf52b8,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806adf52b8,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd806adf52a8,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd806adf52a8,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806e164170,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806e164170,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd806e1465e8,0,ffff800021292a38,ffff800021292a08,0,2,691ba5140742fecf,ffffffff82273fc0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd806e1465e8,0,ffff800021292a38,ffff800021292a08,0,2,691ba5140742fecf,ffffffff82273fc0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800021292ba0,ffff800021292bd8,ffff800021292b20,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807effc2e0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800021292d30,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800021292d30) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800021292f60) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021292f60) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xda270388f10, count: -15