witness: lock order reversal: 1st 0xfffffd807effe468 vmmaplk (&map->lock) 2nd 0xfffffd806dcf03d8 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+0x24f sys/arch/amd64/amd64/trap.c:219 #5 kerntrap+0xf1 sys/arch/amd64/amd64/trap.c:300 #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:566 #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_mlockall+0x6a sys/uvm/uvm_mmap.c:833 #11 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 #12 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd806dcf03d8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806dcf03d8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806dcf03c8,81) at rw_enter+0xd4 rrw_enter(fffffd806dcf03c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806da05ec0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd806da05ec0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806dd25cf8,ffff800021702568,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806dd25cf8,7000,ffff8000217027c0,ffff80002170275c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effe450,1b33627000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effe450,1b33620000,1b34620000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effe450,fffffd806c7fd6c8,0,351,ffffffff81d31820,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000212a69f8,ffff800021702998,ffff8000217029e0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:833 syscall(ffff800021702a60) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021702a60) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x11395a92110, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff8000217021c0 rbx 0x3 rdx 0xffff800000b01300 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff81d89703 witness_checkorder+0xf33 r9 0x5 r10 0x5c21ca8e5d7e4caa r11 0xe5ad3361320d2624 r12 0xffffffff82856400 w_lodata+0x54590 r13 0 r14 0xffffffff82842d40 w_lodata+0x40ed0 r15 0xfffffd8002c8f480 rip 0xffffffff81575e58 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000217021b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=146987 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000212a6508,0xffffffff82886868 process=0xffff8000212cebd8 user=0xffff8000216fd000, vmspace=0xfffffd807effe450 estcpu=36, cpticks=8, pctcpu=0.0 user=0, sys=8, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45445 441857 96634 0 2 0 syz-executor.0 *45445 146987 96634 0 7 0x4000000 syz-executor.0 47272 445671 73203 0 2 0x482 syz-executor.1 96634 104324 73203 0 7 0x482 syz-executor.0 73203 52706 95990 0 3 0x82 thrsleep syz-fuzzer 73203 382870 95990 0 2 0x4000482 syz-fuzzer 73203 301872 95990 0 3 0x4000082 thrsleep syz-fuzzer 73203 239744 95990 0 2 0x4000482 syz-fuzzer 73203 277341 95990 0 3 0x4000082 thrsleep syz-fuzzer 73203 500304 95990 0 3 0x4000082 thrsleep syz-fuzzer 73203 425213 95990 0 3 0x4000082 thrsleep syz-fuzzer 73203 469694 95990 0 3 0x4000082 thrsleep syz-fuzzer 95990 233063 38268 0 3 0x10008a pause ksh 38268 83774 48219 0 3 0x92 select sshd 96376 297293 1 0 3 0x100083 ttyin getty 48219 258633 1 0 3 0x80 select sshd 33644 145904 4642 74 3 0x100092 bpf pflogd 4642 87423 1 0 3 0x80 netio pflogd 64496 49739 91069 73 3 0x100090 kqread syslogd 91069 198900 1 0 3 0x100082 netio syslogd 87379 35675 1 77 3 0x100090 poll dhclient 69994 402939 1 0 3 0x80 poll dhclient 54841 100035 0 0 3 0x14200 bored smr 27343 482567 0 0 2 0x14200 zerothread 12286 8311 0 0 3 0x14200 aiodoned aiodoned 38131 200958 0 0 3 0x14200 syncer update 97830 427697 0 0 3 0x14200 cleaner cleaner 29417 139996 0 0 3 0x14200 reaper reaper 91667 204814 0 0 3 0x14200 pgdaemon pagedaemon 39879 323958 0 0 3 0x14200 bored crynlk 78546 347307 0 0 3 0x14200 bored crypto 67453 201270 0 0 3 0x40014200 acpi0 acpi0 76978 21118 0 0 3 0x40014200 idle1 11280 493194 0 0 3 0x14200 bored softnet 28614 374968 0 0 3 0x14200 bored systqmp 49402 491669 0 0 3 0x14200 bored systq 98570 243879 0 0 2 0x40014200 softclock 44080 17451 0 0 3 0x40014200 idle0 1 496175 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 45445 (syz-executor.0) thread 0xffff8000212a69f8 (146987) shared rwlock vmmaplk r = 0 (0xfffffd807effe468) #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_all+0x56 sys/uvm/uvm_map.c:2576 #4 sys_mlockall+0x6a sys/uvm/uvm_mmap.c:833 #5 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8287edb8) #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:566 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9472 6421K 6430K 78643K 19685 0 pcb 13 8K 8K 78643K 101 0 rtable 105 3K 3K 78643K 279 0 ifaddr 44 10K 10K 78643K 60 0 sysctl 2 0K 0K 78643K 2 0 counters 43 33K 33K 78643K 47 0 ioctlops 0 0K 4K 78643K 2240 0 iov 0 0K 2K 78643K 129 0 mount 1 1K 1K 78643K 1 0 vnodes 1226 77K 77K 78643K 5400 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 1076 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 367 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 28901 0 sigio 0 0K 0K 78643K 221 0 proc 59 63K 95K 78643K 527 0 subproc 32 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 55 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 31 148K 148K 78643K 31 0 exec 0 0K 2K 78643K 406 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 123 27K 27K 78643K 63104 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 16 0 temp 105 3961K 4025K 78643K 65041 0 kqueue 3 4K 9K 78643K 1700 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 10 0 4 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 96 23 0 21 1 0 1 1 0 8 0 rtentry 112 67 0 23 2 0 2 2 0 8 0 unpcb 120 8354 0 8344 1 0 1 1 0 8 0 syncache 272 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 592 184 0 180 5 4 1 3 0 8 0 inpcb 296 668 0 661 1 0 1 1 0 8 0 nd6 48 12 0 6 1 0 1 1 0 8 0 kcovpl 48 4 0 2 1 0 1 1 0 8 0 pffrag 232 3 0 3 1 1 0 1 0 482 0 pffrnode 88 2 0 2 1 1 0 1 0 8 0 pffrent 40 430 0 430 1 1 0 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 17 0 15 1 0 1 1 0 8 0 pfstkey 112 17 0 15 1 0 1 1 0 8 0 pfstate 328 17 0 15 2 1 1 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 276 0 88 12 0 12 12 0 8 0 art_table 32 277 0 88 2 0 2 2 0 8 0 art_node 16 66 0 26 1 0 1 1 0 8 0 semapl 112 365 0 355 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 31411 0 30000 90 1 89 89 0 8 0 ffsino 272 31411 0 30000 96 1 95 95 0 8 0 nchpl 144 67446 0 65855 61 1 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 147006 0 147006 1 0 1 1 0 8 1 percpumem 16 34 0 2 1 0 1 1 0 8 0 scxspl 192 182134 0 182134 8 7 1 7 0 8 1 plimitpl 152 186 0 177 1 0 1 1 0 8 0 sigapl 424 29110 0 29079 4 0 4 4 0 8 0 futexpl 56 122192 0 122192 1 0 1 1 0 8 1 knotepl 112 1545 0 1525 1 0 1 1 0 8 0 kqueuepl 152 3406 0 3348 3 0 3 3 0 8 0 pipepl 304 12037 0 12026 34 32 2 2 0 8 1 fdescpl 496 29095 0 29079 3 0 3 3 0 8 0 filepl 152 87757 0 87654 5 0 5 5 0 8 0 lockfpl 104 1756 0 1755 1 0 1 1 0 8 0 lockfspl 48 782 0 781 1 0 1 1 0 8 0 sessionpl 120 20 0 9 1 0 1 1 0 8 0 pgrppl 48 119 0 108 1 0 1 1 0 8 0 ucredpl 96 1562 0 1553 1 0 1 1 0 8 0 zombiepl 144 29079 0 29078 1 0 1 1 0 8 0 processpl 1008 29110 0 29078 5 0 5 5 0 8 0 procpl 632 62488 0 62448 4 0 4 4 0 8 0 sockpl 400 9045 0 9026 4 1 3 4 0 8 0 mcl64k 65536 12 0 0 2 0 2 2 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 41 0 0 3 1 2 2 0 8 0 mcl9k 9216 41 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 19 0 0 2 0 2 2 0 8 0 mcl2k 2048 117 0 0 14 0 14 14 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 805 0 0 13 1 12 13 0 8 0 bufpl 280 32606 0 26358 447 0 447 447 0 8 0 anonpl 16 1759756 0 1751405 36 2 34 34 0 124 0 amapchunkpl 152 97218 0 96816 17 1 16 16 0 158 0 amappl16 192 88791 0 88663 9 2 7 8 0 8 0 amappl15 184 406 0 405 1 0 1 1 0 8 0 amappl14 176 24 0 19 1 0 1 1 0 8 0 amappl13 168 22197 0 22192 1 0 1 1 0 8 0 amappl12 160 6295 0 6291 1 0 1 1 0 8 0 amappl11 152 59 0 42 1 0 1 1 0 8 0 amappl10 144 11 0 6 1 0 1 1 0 8 0 amappl9 136 312 0 310 1 0 1 1 0 8 0 amappl8 128 439 0 378 2 0 2 2 0 8 0 amappl7 120 272 0 263 1 0 1 1 0 8 0 amappl6 112 83 0 66 1 0 1 1 0 8 0 amappl5 104 14883 0 14866 1 0 1 1 0 8 0 amappl4 96 6600 0 6573 1 0 1 1 0 8 0 amappl3 88 37844 0 37833 1 0 1 1 0 8 0 amappl2 80 203584 0 203513 3 0 3 3 0 8 0 amappl1 72 810167 0 809680 25 15 10 19 0 8 0 amappl 80 62767 0 62711 2 0 2 2 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 64 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 29095 0 29079 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 29095 0 29079 1 0 1 1 0 8 0 vmmpekpl 168 161666 0 161629 3 0 3 3 0 8 0 vmmpepl 168 3545773 0 3544415 148 82 66 76 0 357 1 vmsppl 368 29094 0 29079 2 0 2 2 0 8 0 pdppl 4096 58197 0 58158 6 0 6 6 0 8 0 pvpl 32 5535885 0 5524355 227 134 93 114 0 265 0 pmappl 232 29094 0 29079 2 1 1 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 258 0 10 9 1 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd806dcf03d8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806dcf03d8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806dcf03c8,81) at rw_enter+0xd4 rrw_enter(fffffd806dcf03c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806da05ec0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd806da05ec0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806dd25cf8,ffff800021702568,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806dd25cf8,7000,ffff8000217027c0,ffff80002170275c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effe450,1b33627000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effe450,1b33620000,1b34620000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effe450,fffffd806c7fd6c8,0,351,ffffffff81d31820,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000212a69f8,ffff800021702998,ffff8000217029e0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:833 syscall(ffff800021702a60) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021702a60) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x11395a92110, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d80ff0) 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 __mp_lock(ffffffff8287ebb0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8287ebb0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8287ebb0,1) 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(ffff8000212f0830,1) at sleep_finish+0x111 sys/kern/kern_synch.c:418 sleep_finish_all(ffff8000212f0830,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff8000212f0830,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(ffffffff8277d434,120,ffffffff823b3c3e,2) at tsleep+0x1c2 sys/kern/kern_synch.c:155 sys_nanosleep(ffff8000211e6ed8,ffff8000212f0960,ffff8000212f09b0) at sys_nanosleep+0x1f5 sys/kern/kern_time.c:297 syscall(ffff8000212f0a30) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212f0a30) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:566 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeb590, count: -12