login: witness: lock order reversal: 1st 0xfffffd807e941310 vmmaplk (&map->lock) 2nd 0xfffffd8065ddb820 fdlock (&newfdp->fd_fd.fd_lock) lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter+0xd1 sys/kern/kern_rwlock.c:250 #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(fffffd8065ddb820,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8065ddb820,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8065ddb810) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000b93800,fffffd806cf3d0b0,fffffd8065ddb7c8,0,0,ffff8000ffff29a8,dae018dcc0d12eba,fb,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e368b58,4,20000080,ffff80002e368b88,ffff8000fffeda50) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff80002e368b54,5,20000080,ffff80002e368b88,0,0,ad9b4686d1f70b2e) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000fffeda50,ffff80002e368bf8,ffff80002e368c50) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e368cc0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e368cc0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfea9c389780, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002e3684c0 rbx 0x3 rdx 0xffff800000bbcdc0 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff80002e368430 r9 0x8080808080808080 r10 0xea2646b326a68ad7 r11 0xd154ad57fcba886a r12 0xffffffff82aac9c0 w_lodata+0x4f050 r13 0 r14 0xffffffff82aab260 w_lodata+0x4d8f0 r15 0xfffffd8002f62c80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e3684b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=481089 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffec010,0xffff8000ffff6d40 process=0xffff8000fffea9b0 user=0xffff80002e363000, vmspace=0xfffffd807e9412f8 estcpu=12, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82673 241010 67024 0 2 0x40 syz-executor.2 32994 9794 53503 0 2 0x40 syz-executor.6 21036 298577 42227 32767 2 0x10 syz-executor.0 21036 203715 42227 32767 3 0x4000090 fsleep syz-executor.0 48621 20540 15205 32767 2 0x10 syz-executor.4 48621 204205 15205 32767 2 0x4000010 syz-executor.4 96371 341133 69533 0 2 0x100002 sh 28866 449375 68058 0 2 0x100002 sh 85245 279111 71854 32767 7 0x10 syz-executor.1 *85245 481089 71854 32767 7 0x4000010 syz-executor.1 69533 476029 24558 0 3 0x80 wait syz-executor.3 53503 86576 30254 0 3 0x80 ppwait syz-executor.6 73653 457706 8693 32767 2 0x10 syz-executor.7 73653 280147 8693 32767 3 0x4000090 fsleep syz-executor.7 68058 97564 30104 0 3 0x80 wait syz-executor.5 8693 272343 4912 32767 3 0x90 nanoslp syz-executor.7 30254 28911 16520 0 3 0x82 wait syz-executor.6 4912 464321 16520 0 3 0x82 wait syz-executor.7 15205 33865 50035 32767 3 0x90 nanoslp syz-executor.4 24558 414759 16520 0 3 0x82 wait syz-executor.3 50035 299036 16520 0 3 0x82 wait syz-executor.4 71854 348845 77406 32767 3 0x90 nanoslp syz-executor.1 42227 159860 1444 32767 3 0x90 nanoslp syz-executor.0 30104 82141 16520 0 3 0x82 wait syz-executor.5 67024 333435 56726 0 3 0x80 ppwait syz-executor.2 56726 230877 16520 0 3 0x82 wait syz-executor.2 77406 147227 16520 0 3 0x82 wait syz-executor.1 1444 89715 16520 0 3 0x82 wait syz-executor.0 16520 73380 4639 0 3 0x82 thrsleep syz-fuzzer 16520 70239 4639 0 3 0x4000082 thrsleep syz-fuzzer 16520 206339 4639 0 3 0x4000082 kqread syz-fuzzer 16520 291951 4639 0 3 0x4000082 thrsleep syz-fuzzer 16520 11148 4639 0 3 0x4000082 thrsleep syz-fuzzer 16520 32406 4639 0 3 0x4000082 thrsleep syz-fuzzer 16520 242017 4639 0 3 0x4000082 thrsleep syz-fuzzer 16520 356705 4639 0 3 0x4000082 thrsleep syz-fuzzer 16520 110541 4639 0 3 0x4000082 thrsleep syz-fuzzer 16520 493567 4639 0 3 0x4000082 thrsleep syz-fuzzer 4639 451553 15433 0 3 0x10008a sigsusp ksh 15433 303861 85179 0 3 0x9a kqread sshd 69317 324084 1 0 3 0x100083 ttyin getty 85179 54315 1 0 3 0x88 kqread sshd 22742 152612 90074 73 3 0x1100090 kqread syslogd 90074 463445 1 0 3 0x100082 netio syslogd 48105 418711 1 0 3 0x100080 kqread resolvd 45723 339487 75956 77 3 0x100092 kqread dhcpleased 36970 403759 75956 77 3 0x100092 kqread dhcpleased 75956 282465 1 0 3 0x80 kqread dhcpleased 45725 320230 0 0 3 0x14200 bored smr 86915 128022 0 0 2 0x14200 zerothread 84591 68309 0 0 3 0x14200 aiodoned aiodoned 29014 472340 0 0 3 0x14200 syncer update 15954 200698 0 0 3 0x14200 cleaner cleaner 98137 33774 0 0 3 0x14200 reaper reaper 37236 401910 0 0 3 0x14200 pgdaemon pagedaemon 8556 284087 0 0 3 0x14200 bored viomb 11305 156456 0 0 3 0x40014200 acpi0 acpi0 14543 289086 0 0 3 0x40014200 idle1 76446 296239 0 0 3 0x14200 bored softnet 16154 303868 0 0 3 0x14200 bored systqmp 93791 68291 0 0 3 0x14200 bored systq 10466 2369 0 0 3 0x40014200 bored softclock 88398 441367 0 0 3 0x40014200 idle0 1 161282 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 85245 (syz-executor.1) thread 0xffff8000fffeda50 (481089) shared rwlock vmmaplk r = 0 (0xfffffd807e941310) #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 10169 6406K 6419K 78643K 11259 0 pcb 13 8K 8K 78643K 13 0 rtable 230 6K 6K 78643K 324 0 ifaddr 81 16K 16K 78643K 82 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 33 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1270 79K 79K 78643K 1283 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 113K 78643K 147 0 proc 56 74K 111K 78643K 451 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 99 6K 6K 78643K 99 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 37 175K 175K 78643K 37 0 exec 0 0K 2K 78643K 594 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 284 77K 78K 78643K 3097 0 UVM aobj 4 2K 2K 78643K 4 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 27 2K 2K 78643K 27 0 temp 87 4694K 4757K 78643K 4183 0 kqueue 12 18K 18K 78643K 22 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 29 0 26 1 0 1 1 0 8 0 rtentry 112 107 0 1 4 0 4 4 0 8 0 unpcb 136 34 0 21 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpcb 736 8 0 4 1 0 1 1 0 8 0 arp 120 18 0 0 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 57 0 50 1 0 1 1 0 8 0 nd6 48 20 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 256 449 0 0 29 0 29 29 0 8 0 art_table 32 450 0 0 4 0 4 4 0 8 0 art_node 16 106 0 10 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1481 0 57 89 0 89 89 0 8 0 ffsino 272 1481 0 57 95 0 95 95 0 8 0 nchpl 144 1742 0 78 62 0 62 62 0 8 0 uvmvnodes 80 1594 0 0 33 0 33 33 0 8 0 vnodes 224 1594 0 0 94 0 94 94 0 8 0 namei 1024 5727 0 5727 2 0 2 2 0 8 2 percpumem 16 40 0 0 1 0 1 1 0 8 0 scxspl 216 5363 0 5363 2 1 1 2 0 8 1 plimitpl 152 31 0 8 1 0 1 1 0 8 0 sigapl 424 420 0 369 7 0 7 7 0 8 0 futexpl 64 43 0 41 1 0 1 1 0 8 0 knotepl 120 113 0 0 4 0 4 4 0 8 0 kqueuepl 216 18 0 10 1 0 1 1 0 8 0 pipepl 336 122 0 94 3 0 3 3 0 8 0 fdescpl 496 406 0 369 7 1 6 6 0 8 0 filepl 152 1474 0 1238 10 0 10 10 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 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 73 0 59 1 0 1 1 0 8 0 zombiepl 144 369 0 369 1 0 1 1 0 8 1 processpl 1064 420 0 369 5 1 4 4 0 8 0 procpl 672 442 0 378 6 0 6 6 0 8 0 sockpl 480 121 0 98 4 0 4 4 0 8 1 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 145 0 0 18 0 18 18 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 259 0 0 16 0 16 16 0 8 0 bufpl 288 3593 0 144 247 0 247 247 0 8 0 anonpl 24 64651 0 52619 78 2 76 76 0 186 1 amapchunkpl 152 6696 0 5988 33 1 32 32 0 158 2 amappl16 200 573 0 295 19 1 18 18 0 8 0 amappl15 192 96 0 89 1 0 1 1 0 8 0 amappl14 184 11 0 8 1 0 1 1 0 8 0 amappl13 176 77 0 74 1 0 1 1 0 8 0 amappl12 168 27 0 20 1 0 1 1 0 8 0 amappl11 160 39 0 29 1 0 1 1 0 8 0 amappl10 152 44 0 38 1 0 1 1 0 8 0 amappl9 144 480 0 471 1 0 1 1 0 8 0 amappl8 136 527 0 485 2 0 2 2 0 8 0 amappl7 128 115 0 104 1 0 1 1 0 8 0 amappl6 120 227 0 203 2 0 2 2 0 8 1 amappl5 112 217 0 194 1 0 1 1 0 8 0 amappl4 104 758 0 728 2 0 2 2 0 8 1 amappl3 96 167 0 156 1 0 1 1 0 8 0 amappl2 88 497 0 455 3 0 3 3 0 8 1 amappl1 80 10221 0 9626 18 0 18 18 0 8 4 amappl 88 2700 0 2472 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 72 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 406 0 369 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 406 0 369 1 0 1 1 0 8 0 vmmpekpl 168 7777 0 7737 2 0 2 2 0 8 0 vmmpepl 168 39921 0 37482 125 0 125 125 0 357 16 vmsppl 368 405 0 369 4 0 4 4 0 8 0 rwobjpl 56 12066 0 9275 42 0 42 42 0 8 0 pdppl 4096 819 0 738 101 12 89 89 0 8 8 pvpl 32 242846 0 226147 262 2 260 260 0 265 120 pmappl 248 405 0 369 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 614 0 14 18 0 18 18 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(ffff800029f3e5c0,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+0x120 __mp_lock_spin sys/kern/kern_lock.c:117 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x120 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7ffffe2b20, 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(fffffd8065ddb820,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8065ddb820,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(fffffd8065ddb810) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 fill_file(ffff800000b93800,fffffd806cf3d0b0,fffffd8065ddb7c8,0,0,ffff8000ffff29a8,dae018dcc0d12eba,fb,0) at fill_file+0xad2 sys/kern/kern_sysctl.c:1304 sysctl_file(ffff80002e368b58,4,20000080,ffff80002e368b88,ffff8000fffeda50) at sysctl_file+0x62d sys/kern/kern_sysctl.c:1457 kern_sysctl(ffff80002e368b54,5,20000080,ffff80002e368b88,0,0,ad9b4686d1f70b2e) at kern_sysctl+0xfd sys/kern/kern_sysctl.c:449 sys_sysctl(ffff8000fffeda50,ffff80002e368bf8,ffff80002e368c50) at sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 syscall(ffff80002e368cc0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e368cc0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfea9c389780, count: -9