witness: lock order reversal: 1st 0xfffffd807effea28 vmmaplk (&map->lock) 2nd 0xfffffd8062b141a8 inode (&ip->i_lock) lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 #2 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1438 #3 uvm_fault+0x7e sys/uvm/uvm_fault.c:526 #4 pageflttrap+0x254 sys/arch/amd64/amd64/trap.c:219 #5 kerntrap+0xf1 sys/arch/amd64/amd64/trap.c:301 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 ffs_read+0x3e2 sys/ufs/ffs/ffs_vnops.c:258 #9 VOP_READ+0xbf sys/kern/vfs_vops.c:253 #10 vn_rdwr+0x10b #11 vmcmd_map_readvn+0xda sys/kern/exec_subr.c:246 #12 exec_process_vmcmds+0xb2 sys/kern/exec_subr.c:143 #13 sys_execve+0x9ff sys/kern/kern_exec.c:461 #14 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #15 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter+0xd4 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 #4 vn_lock+0x6c sys/kern/vfs_vnops.c:575 #5 uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 #6 uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 #7 uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 #8 uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 #9 uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 #10 sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 #11 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #12 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:398 witness_checkorder(fffffd8062b141a8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd8062b141a8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd8062b14198,81) at rw_enter+0xd4 rrw_enter(fffffd8062b14198,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd805eede348,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd805eede348,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd805ede63c0,ffff800025725da8,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd805ede63c0,2000,ffff800025726000,ffff800025725f9c,0,5) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effea10,20002000,2,5) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effea10,20002000,20003000,5) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effea10,fffffd805f378988,fffffd805f378640,39c,ffffffff82331ade,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000ffffa9f8,ffff8000257261e8,ffff800025726230) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 syscall(ffff8000257262b0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000257262b0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd57be6abac0, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800025725a00 rbx 0x3 rdx 0xffff800000ae8fc0 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff8232f783 witness_checkorder+0xf33 r9 0x5 r10 0xc79dfee87b0b35fd r11 0x59d2856770b4c1d3 r12 0xffffffff8287a4c0 w_lodata+0x54380 r13 0 r14 0xffffffff82865f90 w_lodata+0x3fe50 r15 0xfffffd8002c93480 rip 0xffffffff81842498 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000257259f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=128670 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffb8c8,0xffffffff828a8b58 process=0xffff8000ffff87e8 user=0xffff800025721000, vmspace=0xfffffd807effea10 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60511 482845 56043 32767 2 0x10 syz-executor.0 *60511 128670 56043 32767 7 0x4000010 syz-executor.0 78029 236627 35783 32767 2 0x10 syz-executor.1 78029 226910 35783 32767 7 0x4000090 syz-executor.1 10082 8835 0 0 3 0x14200 bored sosplice 35783 71766 14144 32767 3 0x90 nanosleep syz-executor.1 56043 344382 2807 32767 3 0x90 nanosleep syz-executor.0 14144 427632 23977 0 3 0x82 wait syz-executor.1 2807 60679 23977 0 3 0x82 wait syz-executor.0 23977 46190 45081 0 3 0x82 thrsleep syz-fuzzer 23977 387047 45081 0 3 0x4000082 thrsleep syz-fuzzer 23977 56155 45081 0 3 0x4000082 thrsleep syz-fuzzer 23977 346881 45081 0 3 0x4000082 thrsleep syz-fuzzer 23977 308704 45081 0 3 0x4000082 thrsleep syz-fuzzer 23977 369191 45081 0 3 0x4000082 thrsleep syz-fuzzer 23977 193062 45081 0 3 0x4000082 thrsleep syz-fuzzer 23977 279877 45081 0 3 0x4000082 kqread syz-fuzzer 45081 238547 71883 0 3 0x10008a pause ksh 71883 327918 49889 0 3 0x92 select sshd 64626 123546 1 0 3 0x100083 ttyin getty 49889 37704 1 0 3 0x80 select sshd 15936 461580 97960 73 3 0x100090 kqread syslogd 97960 171880 1 0 3 0x100082 netio syslogd 68012 200461 1 77 3 0x100090 poll dhclient 88545 136605 1 0 3 0x80 poll dhclient 66375 515716 0 0 3 0x14200 bored smr 76047 163991 0 0 2 0x14200 zerothread 84141 272688 0 0 3 0x14200 aiodoned aiodoned 19323 452279 0 0 3 0x14200 syncer update 41782 24135 0 0 3 0x14200 cleaner cleaner 5958 304566 0 0 3 0x14200 reaper reaper 459 41010 0 0 3 0x14200 pgdaemon pagedaemon 71571 513240 0 0 3 0x14200 bored crynlk 75 482297 0 0 3 0x14200 bored crypto 32958 232960 0 0 3 0x40014200 acpi0 acpi0 77961 229379 0 0 3 0x40014200 idle1 82521 328018 0 0 3 0x14200 bored softnet 88769 346041 0 0 3 0x14200 bored systqmp 51921 152896 0 0 3 0x14200 bored systq 19137 57260 0 0 3 0x40014200 bored softclock 34374 279247 0 0 3 0x40014200 idle0 1 286484 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 60511 (syz-executor.0) thread 0xffff8000ffffa9f8 (128670) shared rwlock vmmaplk r = 0 (0xfffffd807effea28) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 rw_enter+0x446 sys/kern/kern_rwlock.c:311 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5452 #3 uvm_map_pageable+0x120 sys/uvm/uvm_map.c:2463 #4 sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 #5 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8289d1b8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3fd sys/arch/amd64/amd64/trap.c:567 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9465 6330K 6330K 78643K 10557 0 pcb 13 8K 8K 78643K 13 0 rtable 105 3K 3K 78643K 191 0 ifaddr 39 10K 10K 78643K 39 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 2K 78643K 333 0 iov 0 0K 16K 78643K 159 0 mount 1 1K 1K 78643K 1 0 vnodes 1216 76K 76K 78643K 1235 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 82 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 3411 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 8 25K 33K 78643K 50842 0 sigio 0 0K 0K 78643K 17 0 proc 48 50K 83K 78643K 423 0 subproc 34 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 650 0 in_multi 33 2K 2K 78643K 33 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 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 371 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 312 50K 52K 78643K 113011 0 UVM aobj 131 6K 6K 78643K 143 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 6 0 NDP 5 0K 0K 78643K 9 0 temp 101 3961K 4025K 78643K 103508 0 kqueue 3 4K 9K 78643K 70 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 arp 64 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 96 29 0 27 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 88346 0 88338 3 1 2 2 0 8 1 syncache 272 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1417 0 1417 4 4 0 3 0 8 0 tcpcb 592 401 0 397 3 2 1 3 0 8 0 inpcb 296 447 0 440 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 189 0 0 12 0 12 12 0 8 0 art_table 32 190 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semapl 112 3409 0 3399 1 0 1 1 0 8 0 shmpl 112 140 0 12 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 58410 0 57013 88 0 88 88 0 8 0 ffsino 272 58410 0 57013 94 0 94 94 0 8 0 nchpl 144 119476 0 117878 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 208 5926 0 0 312 0 312 312 0 8 0 namei 1024 244194 0 244194 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 348650 0 348650 8 7 1 7 0 8 1 plimitpl 152 110 0 101 1 0 1 1 0 8 0 sigapl 424 51030 0 50997 4 0 4 4 0 8 0 futexpl 56 291625 0 291625 1 0 1 1 0 8 1 knotepl 112 132 0 112 1 0 1 1 0 8 0 kqueuepl 152 50676 0 50667 1 0 1 1 0 8 0 pipepl 304 2541 0 2530 21 19 2 2 0 8 1 fdescpl 496 51014 0 50997 3 0 3 3 0 8 0 filepl 152 219214 0 219112 10 5 5 6 0 8 1 lockfpl 104 1280 0 1279 1 0 1 1 0 8 0 lockfspl 48 602 0 601 1 0 1 1 0 8 0 sessionpl 120 17 0 7 1 0 1 1 0 8 0 pgrppl 48 46 0 36 1 0 1 1 0 8 0 ucredpl 96 1734 0 1725 1 0 1 1 0 8 0 zombiepl 144 50997 0 50997 2 1 1 1 0 8 1 processpl 1008 51030 0 50997 5 0 5 5 0 8 0 procpl 632 104961 0 104919 4 0 4 4 0 8 0 sosppl 144 3 0 3 2 2 0 1 0 8 0 sockpl 400 88946 0 88929 26 21 5 5 0 8 3 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 13 0 0 2 0 2 2 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 33 0 0 2 0 2 2 0 8 0 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 18 0 0 2 0 2 2 0 8 0 mcl2k 2048 529 0 0 61 18 43 61 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 811 0 0 31 1 30 31 0 8 0 bufpl 280 72899 0 66651 447 0 447 447 0 8 0 anonpl 16 3349476 0 3310567 186 9 177 184 0 124 0 amapchunkpl 152 162386 0 161098 56 6 50 55 0 158 0 amappl16 192 113377 0 111930 103 30 73 93 0 8 0 amappl15 184 4 0 2 1 0 1 1 0 8 0 amappl14 176 25546 0 25537 1 0 1 1 0 8 0 amappl13 168 945 0 943 1 0 1 1 0 8 0 amappl12 160 15 0 11 1 0 1 1 0 8 0 amappl11 152 25354 0 25343 1 0 1 1 0 8 0 amappl10 144 9 0 5 1 0 1 1 0 8 0 amappl9 136 370 0 369 2 1 1 1 0 8 0 amappl8 128 248 0 156 3 0 3 3 0 8 0 amappl7 120 216 0 208 1 0 1 1 0 8 0 amappl6 112 60 0 50 1 0 1 1 0 8 0 amappl5 104 25734 0 25717 1 0 1 1 0 8 0 amappl4 96 50845 0 50817 1 0 1 1 0 8 0 amappl3 88 1477 0 1467 1 0 1 1 0 8 0 amappl2 80 378982 0 378911 2 0 2 2 0 8 0 amappl1 72 1567241 0 1566729 31 21 10 18 0 8 0 amappl 80 105413 0 105204 5 0 5 5 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 142 0 12 3 0 3 3 0 8 0 uaddrrnd 24 51014 0 50997 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 51014 0 50997 1 0 1 1 0 8 0 vmmpekpl 168 164816 0 164773 4 1 3 3 0 8 0 vmmpepl 168 6592074 0 6588979 238 102 136 162 0 357 1 vmsppl 368 51013 0 50997 2 0 2 2 0 8 0 pdppl 4096 102035 0 101994 6 0 6 6 0 8 0 pvpl 32 11082567 0 11040518 433 53 380 403 0 265 0 pmappl 232 51013 0 50997 2 1 1 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 340 0 45 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff826b9ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:558 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:143 __mp_lock(ffffffff8289cfb0) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8289cfb0) at __mp_lock+0x133 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8289cfb0,2) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x390 sys/kern/sched_bsd.c:435 sleep_finish(ffff800023cfcba0,1) at sleep_finish+0x111 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800023cfcba0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800023cfcba0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 rwsleep(ffff8000ffffb8c8,ffffffff8275bb70,120,ffffffff823c200a,0) at rwsleep+0x11b sys/kern/kern_synch.c:313 futex_wait(b81f9d9b860,2,0,2) at futex_wait+0x13c sys/kern/sys_futex.c:254 sys_futex(ffff8000ffffb8c8,ffff800023cfcd40,ffff800023cfcd90) at sys_futex+0x114 sys/kern/sys_futex.c:110 syscall(ffff800023cfce10) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023cfce10) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb81971911f0, count: -14 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:398 witness_checkorder(fffffd8062b141a8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd8062b141a8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd8062b14198,81) at rw_enter+0xd4 rrw_enter(fffffd8062b14198,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd805eede348,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd805eede348,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd805ede63c0,ffff800025725da8,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd805ede63c0,2000,ffff800025726000,ffff800025725f9c,0,5) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effea10,20002000,2,5) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effea10,20002000,20003000,5) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effea10,fffffd805f378988,fffffd805f378640,39c,ffffffff82331ade,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000ffffa9f8,ffff8000257261e8,ffff800025726230) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 syscall(ffff8000257262b0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000257262b0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd57be6abac0, count: -14