login: witness: lock order reversal: 1st 0xfffffd806c552760 vmmaplk (&map->lock) 2nd 0xfffffd806bc02638 fdlock (&newfdp->fd_fd.fd_lock) lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 kpageflttrap+0x209 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 fill_file+0xad2 sys/kern/kern_sysctl.c:1304 #2 sysctl_file+0xe77 sys/kern/kern_sysctl.c:1428 #3 kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 #4 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 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(fffffd806bc02638,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806bc02638,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd806bc02628) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000c1bc00,fffffd806859b150,fffffd806bc025e0,0,0,ffff80002af350c0,d2c2ffa3fc1b543c,ff09,ffff8000fffee2a8) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e37f1e8,4,20000080,ffff80002e37f218,ffff8000fffee2a8) at sysctl_file+0xe77 sys/kern/kern_sysctl.c:1428 kern_sysctl(ffff80002e37f1e4,5,20000080,ffff80002e37f218,0,0,fb5206725fff00c5) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000fffee2a8,ffff80002e37f288,ffff80002e37f2e0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e37f350) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e37f350) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x55efd9ff850, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002e37eb50 rbx 0x3 rdx 0xffff800000bc5540 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002e37eac0 r9 0x8080808080808080 r10 0x34baf24dc24e9b58 r11 0x415fda867d32c691 r12 0xffffffff82aab890 w_lodata+0x4df20 r13 0 r14 0xffffffff82aa92c0 w_lodata+0x4b950 r15 0xfffffd8002f62c80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e37eb40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.3) pid=163154 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffeed28,0xffff80002e35c560 process=0xffff80002af350c0 user=0xffff80002e37a000, vmspace=0xfffffd806c552748 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15782 318226 21891 32767 7 0x10 syz-executor.3 *15782 163154 21891 32767 7 0x4000010 syz-executor.3 33146 352849 47085 32767 2 0x10 syz-executor.5 33146 311844 47085 32767 3 0x4000090 fsleep syz-executor.5 53218 152045 75390 32767 2 0x10 syz-executor.6 53218 427925 75390 32767 2 0x4000010 syz-executor.6 4850 398336 82101 32767 2 0x10 syz-executor.7 4850 373627 82101 32767 3 0x4000090 fsleep syz-executor.7 93008 445198 26710 32767 2 0x10 syz-executor.1 55615 614 57759 32767 2 0x10 syz-executor.2 55615 48973 57759 32767 3 0x4000090 fsleep syz-executor.2 93747 55018 83047 32767 2 0x10 syz-executor.0 93747 300977 83047 32767 3 0x4000090 kqread syz-executor.0 93747 86768 83047 32767 3 0x4000090 kqread syz-executor.0 33721 231938 0 0 3 0x14200 bored sosplice 82101 100020 20607 32767 2 0x10 syz-executor.7 75390 138730 33567 32767 3 0x90 nanoslp syz-executor.6 84126 140258 64499 32767 3 0x90 piperd syz-executor.4 33567 209553 2929 0 3 0x82 wait syz-executor.6 57759 139008 97284 32767 2 0x10 syz-executor.2 20607 173779 2929 0 3 0x82 wait syz-executor.7 21891 85345 90985 32767 3 0x90 nanoslp syz-executor.3 47085 162682 52084 32767 2 0x10 syz-executor.5 97284 411937 2929 0 3 0x82 wait syz-executor.2 64499 500169 2929 0 3 0x82 wait syz-executor.4 90985 422216 2929 0 3 0x82 wait syz-executor.3 52084 219405 2929 0 3 0x82 wait syz-executor.5 26710 424293 88795 32767 3 0x90 nanoslp syz-executor.1 83047 208379 75103 32767 3 0x90 nanoslp syz-executor.0 88795 119394 2929 0 3 0x82 wait syz-executor.1 75103 118837 2929 0 3 0x82 wait syz-executor.0 2929 59454 527 0 3 0x82 kqread syz-fuzzer 2929 485211 527 0 3 0x4000082 thrsleep syz-fuzzer 2929 364541 527 0 3 0x4000082 thrsleep syz-fuzzer 2929 377155 527 0 3 0x4000082 thrsleep syz-fuzzer 2929 279616 527 0 3 0x4000082 thrsleep syz-fuzzer 2929 246593 527 0 3 0x4000082 thrsleep syz-fuzzer 2929 188740 527 0 3 0x4000082 thrsleep syz-fuzzer 2929 237986 527 0 3 0x4000082 thrsleep syz-fuzzer 2929 362647 527 0 3 0x4000082 thrsleep syz-fuzzer 527 59457 42745 0 3 0x10008a sigsusp ksh 42745 460662 60143 0 3 0x9a kqread sshd 65699 206501 1 0 3 0x100083 ttyin getty 60143 203371 1 0 3 0x88 kqread sshd 35158 405460 79364 73 3 0x1100090 kqread syslogd 79364 518067 1 0 3 0x100082 netio syslogd 89837 89736 1 0 3 0x100080 kqread resolvd 51951 26996 28000 77 3 0x100092 kqread dhcpleased 61747 443019 28000 77 3 0x100092 kqread dhcpleased 28000 405694 1 0 3 0x80 kqread dhcpleased 11650 299936 0 0 3 0x14200 bored smr 82354 406600 0 0 2 0x14200 zerothread 46658 114940 0 0 3 0x14200 aiodoned aiodoned 24126 221874 0 0 3 0x14200 syncer update 97411 237761 0 0 3 0x14200 cleaner cleaner 85671 510137 0 0 3 0x14200 reaper reaper 42774 386051 0 0 3 0x14200 pgdaemon pagedaemon 7925 381825 0 0 3 0x14200 bored viomb 75599 248913 0 0 3 0x40014200 acpi0 acpi0 52720 155423 0 0 3 0x40014200 idle1 23122 436941 0 0 3 0x14200 bored softnet 43368 288670 0 0 3 0x14200 bored systqmp 55365 410427 0 0 3 0x14200 bored systq 20000 43191 0 0 3 0x40014200 bored softclock 90236 128975 0 0 3 0x40014200 idle0 1 148123 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 15782 (syz-executor.3) thread 0xffff8000fffee2a8 (163154) shared rwlock vmmaplk r = 0 (0xfffffd806c552760) #0 witness_lock+0x44d #1 uvm_vslock+0xc8 sys/uvm/uvm_glue.c:129 #2 sys_sysctl+0x2d8 sys/kern/kern_sysctl.c:240 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive rwlock sysctllk r = 0 (0xffffffff82941f10) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 sys_sysctl+0x1b3 sys/kern/kern_sysctl.c:233 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988) #0 witness_lock+0x44d #1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10173 6407K 6419K 78643K 11263 0 pcb 13 8K 8K 78643K 13 0 rtable 240 6K 7K 78643K 402 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 33 0 iov 0 0K 12K 78643K 16 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1270 79K 79K 78643K 1313 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 11 1K 1K 78643K 16 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 125K 78643K 697 0 sigio 0 0K 0K 78643K 7 0 proc 56 74K 111K 78643K 474 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 205 0 in_multi 99 6K 6K 78643K 108 0 ether_multi 1 0K 0K 78643K 1 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 654 0 tdb 3 0K 0K 78643K 3 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 307 78K 78K 78643K 9757 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 28 0 NDP 11 0K 2K 78643K 27 0 temp 125 4704K 4767K 78643K 5434 0 kqueue 13 20K 24K 78643K 90 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 82 0 79 1 0 1 1 0 8 0 rtentry 112 112 0 1 4 0 4 4 0 8 0 unpcb 136 190 0 176 2 1 1 2 0 8 0 syncache 296 8 0 8 2 1 1 1 0 8 1 tcpcb 736 93 0 86 3 0 3 3 0 8 2 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 304 376 0 368 2 0 2 2 0 8 1 nd6 48 25 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 462 0 0 29 0 29 29 0 8 0 art_table 32 463 0 0 4 0 4 4 0 8 0 art_node 16 111 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 0 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2150 0 722 90 0 90 90 0 8 0 ffsino 272 2150 0 722 96 0 96 96 0 8 0 nchpl 144 3092 0 1431 62 0 62 62 0 8 0 uvmvnodes 80 2263 0 0 47 0 47 47 0 8 0 vnodes 224 2263 0 0 134 0 134 134 0 8 0 namei 1024 9190 0 9190 2 1 1 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 9265 0 9265 10 3 7 8 0 8 7 plimitpl 152 87 0 65 2 0 2 2 0 8 1 sigapl 424 985 0 934 7 1 6 7 0 8 0 futexpl 64 3999 0 3996 1 0 1 1 0 8 0 knotepl 120 179 0 0 6 0 6 6 0 8 0 kqueuepl 216 155 0 146 1 0 1 1 0 8 0 pipepl 336 161 0 133 3 0 3 3 0 8 0 fdescpl 496 970 0 934 7 2 5 6 0 8 0 filepl 152 3428 0 3190 10 0 10 10 0 8 0 lockfpl 104 36 0 34 1 0 1 1 0 8 0 lockfspl 48 19 0 17 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 96 607 0 589 1 0 1 1 0 8 0 zombiepl 144 934 0 934 1 0 1 1 0 8 1 processpl 1064 985 0 934 5 1 4 4 0 8 0 procpl 672 1648 0 1582 7 1 6 7 0 8 0 sosppl 168 14 0 14 1 0 1 1 0 8 1 sockpl 480 670 0 645 6 1 5 6 0 8 1 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 8 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 133 0 0 16 0 16 16 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 468 0 0 30 1 29 30 0 8 0 bufpl 288 4202 0 137 291 0 291 291 0 8 0 anonpl 24 202627 0 192852 67 5 62 62 0 186 0 amapchunkpl 152 22032 0 21319 31 2 29 30 0 158 1 amappl16 200 1546 0 1332 13 1 12 12 0 8 0 amappl15 192 174 0 166 1 0 1 1 0 8 0 amappl14 184 80 0 76 1 0 1 1 0 8 0 amappl13 176 152 0 147 1 0 1 1 0 8 0 amappl12 168 14 0 13 1 0 1 1 0 8 0 amappl11 160 269 0 251 1 0 1 1 0 8 0 amappl10 152 105 0 99 1 0 1 1 0 8 0 amappl9 144 558 0 553 1 0 1 1 0 8 0 amappl8 136 575 0 529 2 0 2 2 0 8 0 amappl7 128 114 0 102 1 0 1 1 0 8 0 amappl6 120 274 0 252 2 1 1 2 0 8 0 amappl5 112 701 0 678 1 0 1 1 0 8 0 amappl4 104 1074 0 1039 2 0 2 2 0 8 0 amappl3 96 237 0 222 1 0 1 1 0 8 0 amappl2 88 610 0 565 3 1 2 3 0 8 0 amappl1 80 19671 0 19025 18 4 14 18 0 8 0 amappl 88 9308 0 9057 7 0 7 7 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 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 970 0 934 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 970 0 934 1 0 1 1 0 8 0 vmmpekpl 168 10657 0 10622 2 0 2 2 0 8 0 vmmpepl 168 87517 0 85037 114 1 113 114 0 357 5 vmsppl 368 969 0 934 4 0 4 4 0 8 0 rwobjpl 56 23106 0 19700 48 0 48 48 0 8 0 pdppl 4096 1947 0 1868 117 36 81 95 0 8 2 pvpl 32 507437 0 492464 260 13 247 259 0 265 123 pmappl 248 969 0 934 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 692 0 40 19 0 19 19 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff829baff0) 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(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002e373300,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:144 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7ffffc3070, count: -9 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(fffffd806bc02638,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806bc02638,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd806bc02628) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000c1bc00,fffffd806859b150,fffffd806bc025e0,0,0,ffff80002af350c0,d2c2ffa3fc1b543c,ff09,ffff8000fffee2a8) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e37f1e8,4,20000080,ffff80002e37f218,ffff8000fffee2a8) at sysctl_file+0xe77 sys/kern/kern_sysctl.c:1428 kern_sysctl(ffff80002e37f1e4,5,20000080,ffff80002e37f218,0,0,fb5206725fff00c5) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000fffee2a8,ffff80002e37f288,ffff80002e37f2e0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e37f350) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e37f350) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x55efd9ff850, count: -9