login: witness: lock order reversal: 1st 0xfffffd806eef6300 vmmaplk (&map->lock) 2nd 0xfffffd8067a22a18 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+0x62d sys/kern/kern_sysctl.c:1457 #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(fffffd8067a22a18,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8067a22a18,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8067a22a08) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000bff400,fffffd806ef7fab8,fffffd8067a229c0,0,0,ffff8000212290b8,fef3c58594e2a3ef,4a00,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff800023a555e8,4,20000080,ffff800023a55618,ffff80002587da48) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff800023a555e4,5,20000080,ffff800023a55618,0,0,4c22e227359329bf) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002587da48,ffff800023a55688,ffff800023a556e0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff800023a55750) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023a55750) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x925487edd30, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800023a54f50 rbx 0x3 rdx 0xffff800000bebb80 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff800023a54ec0 r9 0x8080808080808080 r10 0xedfdd04884837f76 r11 0xf9d0b6b4ec73c3eb r12 0xffffffff82aabb50 w_lodata+0x4e1e0 r13 0 r14 0xffffffff82aa96e0 w_lodata+0x4bd70 r15 0xfffffd8002f62c80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023a54f40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.2) pid=517682 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=70, nice=20 forw=0xffffffffffffffff, list=0xffff8000260aafd0,0xffffffff82b3d400 process=0xffff800021228440 user=0xffff800023a50000, vmspace=0xfffffd806eef62e8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77013 198768 38542 32767 2 0x10 syz-executor.0 77013 357192 38542 32767 2 0x4000010 syz-executor.0 90686 58986 78002 32767 2 0x10 syz-executor.2 *90686 517682 78002 32767 7 0x4000010 syz-executor.2 34313 63521 54448 32767 2 0x10 syz-executor.1 34313 124927 54448 32767 2 0x4000010 syz-executor.1 34312 169344 98481 32767 2 0x10 syz-executor.4 17683 369185 30857 32767 2 0x10 syz-executor.6 17683 124389 30857 32767 3 0x4000090 netio syz-executor.6 86644 228058 26505 32767 2 0x10 syz-executor.5 86644 188216 26505 32767 3 0x4000090 fsleep syz-executor.5 12533 386792 26880 32767 2 0x10 syz-executor.3 12533 331631 26880 32767 3 0x4000090 netio syz-executor.3 78002 297920 45179 32767 3 0x90 nanoslp syz-executor.2 45179 354475 34411 0 3 0x82 wait syz-executor.2 96976 293668 0 0 3 0x14200 bored sosplice 26505 338584 9561 32767 3 0x90 nanoslp syz-executor.5 30857 20062 66158 32767 3 0x90 nanoslp syz-executor.6 94715 372295 22745 32767 7 0x10 syz-executor.7 22745 112138 34411 0 3 0x82 wait syz-executor.7 98481 185063 28091 32767 3 0x90 nanoslp syz-executor.4 9561 209514 34411 0 3 0x82 wait syz-executor.5 66158 470846 34411 0 3 0x82 wait syz-executor.6 26880 506570 82710 32767 3 0x90 nanoslp syz-executor.3 28091 488597 34411 0 3 0x82 wait syz-executor.4 82710 304469 34411 0 3 0x82 wait syz-executor.3 54448 416692 34103 32767 2 0x10 syz-executor.1 38542 506734 53069 32767 3 0x90 nanoslp syz-executor.0 34103 345507 34411 0 3 0x82 wait syz-executor.1 53069 443980 34411 0 3 0x82 wait syz-executor.0 34411 238408 1213 0 3 0x82 thrsleep syz-fuzzer 34411 4324 1213 0 3 0x4000082 thrsleep syz-fuzzer 34411 486625 1213 0 3 0x4000082 thrsleep syz-fuzzer 34411 348364 1213 0 3 0x4000082 thrsleep syz-fuzzer 34411 484550 1213 0 3 0x4000082 thrsleep syz-fuzzer 34411 42540 1213 0 3 0x4000082 thrsleep syz-fuzzer 34411 243579 1213 0 3 0x4000082 kqread syz-fuzzer 34411 426314 1213 0 3 0x4000082 thrsleep syz-fuzzer 34411 87036 1213 0 3 0x4000082 thrsleep syz-fuzzer 1213 322567 73564 0 3 0x10008a sigsusp ksh 73564 86160 42567 0 3 0x9a kqread sshd 56039 23169 1 0 3 0x100083 ttyin getty 42567 519030 1 0 3 0x88 kqread sshd 91281 58456 10670 73 3 0x1100090 kqread syslogd 10670 228326 1 0 3 0x100082 netio syslogd 17665 231082 1 0 3 0x100080 kqread resolvd 53937 379259 79637 77 3 0x100092 kqread dhcpleased 63130 495048 79637 77 3 0x100092 kqread dhcpleased 79637 282214 1 0 3 0x80 kqread dhcpleased 21233 518333 0 0 3 0x14200 bored smr 68674 265404 0 0 2 0x14200 zerothread 59098 497985 0 0 3 0x14200 aiodoned aiodoned 54066 364682 0 0 3 0x14200 syncer update 21773 164701 0 0 3 0x14200 cleaner cleaner 523 502324 0 0 3 0x14200 reaper reaper 89312 12399 0 0 3 0x14200 pgdaemon pagedaemon 58409 471323 0 0 3 0x14200 bored viomb 68246 451273 0 0 3 0x40014200 acpi0 acpi0 25689 71262 0 0 3 0x40014200 idle1 6639 293708 0 0 3 0x14200 bored softnet 16351 141728 0 0 3 0x14200 bored systqmp 58187 292138 0 0 3 0x14200 bored systq 35199 222002 0 0 3 0x40014200 bored softclock 45311 47146 0 0 3 0x40014200 idle0 1 241442 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 90686 (syz-executor.2) thread 0xffff80002587da48 (517682) shared rwlock vmmaplk r = 0 (0xfffffd806eef6300) #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 10172 6407K 6419K 78643K 11265 0 pcb 13 8K 8K 78643K 13 0 rtable 238 6K 7K 78643K 381 0 ifaddr 81 16K 16K 78643K 89 0 counters 56 35K 35K 78643K 58 0 ioctlops 0 0K 2K 78643K 35 0 iov 0 0K 16K 78643K 20 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1270 79K 79K 78643K 1312 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 17 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 25 93K 121K 78643K 587 0 sigio 0 0K 0K 78643K 25 0 proc 56 74K 111K 78643K 487 0 subproc 104 6K 6K 78643K 117 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 76 0 in_multi 99 6K 7K 78643K 120 0 ether_multi 1 0K 0K 78643K 5 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 641 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 336 80K 81K 78643K 8267 0 UVM aobj 17 2K 2K 78643K 17 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 41 0 NDP 11 0K 2K 78643K 30 0 temp 104 4702K 4765K 78643K 5281 0 kqueue 12 18K 24K 78643K 69 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 51 0 48 1 0 1 1 0 8 0 rtentry 112 122 0 12 4 0 4 4 0 8 0 unpcb 136 207 0 194 1 0 1 1 0 8 0 syncache 296 11 0 11 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 153 0 146 7 1 6 6 0 8 4 arp 120 20 0 2 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 304 296 0 286 2 0 2 2 0 8 1 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 48 27 0 3 1 0 1 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 496 0 44 29 0 29 29 0 8 0 art_table 32 497 0 44 4 0 4 4 0 8 0 art_node 16 121 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 12 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 14 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1979 0 550 90 0 90 90 0 8 0 ffsino 272 1979 0 550 96 0 96 96 0 8 0 nchpl 144 2774 0 1148 62 0 62 62 0 8 0 uvmvnodes 80 2105 0 0 43 0 43 43 0 8 0 vnodes 224 2105 0 0 124 0 124 124 0 8 0 namei 1024 8332 0 8332 2 1 1 2 0 8 1 percpumem 16 41 0 1 1 0 1 1 0 8 0 scxspl 216 8576 0 8576 11 8 3 8 0 8 3 plimitpl 152 50 0 27 1 0 1 1 0 8 0 sigapl 424 859 0 808 7 1 6 7 0 8 0 futexpl 64 2674 0 2673 1 0 1 1 0 8 0 knotepl 120 190 0 0 6 0 6 6 0 8 0 kqueuepl 216 79 0 71 1 0 1 1 0 8 0 pipepl 336 131 0 103 3 0 3 3 0 8 0 fdescpl 496 844 0 808 7 2 5 6 0 8 0 filepl 152 2781 0 2542 10 0 10 10 0 8 0 lockfpl 104 66 0 64 1 0 1 1 0 8 0 lockfspl 48 25 0 23 1 0 1 1 0 8 0 sessionpl 144 24 0 8 1 0 1 1 0 8 0 pgrppl 48 25 0 9 1 0 1 1 0 8 0 ucredpl 96 310 0 292 1 0 1 1 0 8 0 zombiepl 144 808 0 808 1 0 1 1 0 8 1 processpl 1064 859 0 808 5 1 4 4 0 8 0 procpl 672 1376 0 1311 7 1 6 7 0 8 0 sosppl 168 5 0 5 2 1 1 1 0 8 1 sockpl 480 554 0 528 6 1 5 5 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 138 0 0 17 0 17 17 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 359 0 0 22 0 22 22 0 8 0 bufpl 288 4194 0 139 290 0 290 290 0 8 0 anonpl 24 176682 0 164445 81 2 79 79 0 186 0 amapchunkpl 152 18938 0 18138 36 3 33 34 0 158 1 amappl16 200 1454 0 1178 18 1 17 17 0 8 1 amappl15 192 89 0 84 1 0 1 1 0 8 0 amappl14 184 14 0 12 1 0 1 1 0 8 0 amappl13 176 149 0 145 1 0 1 1 0 8 0 amappl12 168 154 0 145 1 0 1 1 0 8 0 amappl11 160 217 0 198 1 0 1 1 0 8 0 amappl10 152 103 0 96 1 0 1 1 0 8 0 amappl9 144 473 0 469 1 0 1 1 0 8 0 amappl8 136 610 0 560 2 0 2 2 0 8 0 amappl7 128 148 0 137 1 0 1 1 0 8 0 amappl6 120 205 0 185 2 1 1 2 0 8 0 amappl5 112 507 0 487 1 0 1 1 0 8 0 amappl4 104 1061 0 1025 2 0 2 2 0 8 0 amappl3 96 386 0 364 1 0 1 1 0 8 0 amappl2 88 628 0 580 3 1 2 3 0 8 0 amappl1 80 17579 0 16929 18 4 14 18 0 8 0 amappl 88 7828 0 7557 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 16 0 0 1 0 1 1 0 8 0 uaddrrnd 24 844 0 808 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 844 0 808 1 0 1 1 0 8 0 vmmpekpl 168 9662 0 9609 3 0 3 3 0 8 0 vmmpepl 168 78033 0 75441 126 9 117 126 0 357 1 vmsppl 368 843 0 808 4 0 4 4 0 8 0 rwobjpl 56 20883 0 17532 49 1 48 48 0 8 0 pdppl 4096 1695 0 1616 125 44 81 93 0 8 2 pvpl 32 438183 0 420719 244 26 218 244 0 265 72 pmappl 248 843 0 808 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 697 0 48 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(ffff800029538f30,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff829de780) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x129 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff829de780) at __mp_lock+0x12e __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x12e sys/kern/kern_lock.c:147 syscall(ffff800029539260) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff800029539260) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffcb4d0, count: -12 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(fffffd8067a22a18,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8067a22a18,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8067a22a08) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000bff400,fffffd806ef7fab8,fffffd8067a229c0,0,0,ffff8000212290b8,fef3c58594e2a3ef,4a00,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff800023a555e8,4,20000080,ffff800023a55618,ffff80002587da48) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff800023a555e4,5,20000080,ffff800023a55618,0,0,4c22e227359329bf) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff80002587da48,ffff800023a55688,ffff800023a556e0) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff800023a55750) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023a55750) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x925487edd30, count: -9