login: witness: lock order reversal: 1st 0xfffffd806e9aa300 vmmaplk (&map->lock) 2nd 0xfffffd806fc14928 inode (&ip->i_lock) lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x69c witness_lock_order_check sys/kern/subr_witness.c:2442 [inline] #0 witness_checkorder+0x69c sys/kern/subr_witness.c:873 #1 rw_enter_read+0x66 sys/kern/kern_rwlock.c:109 #2 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1448 #3 uvm_fault+0x7f sys/uvm/uvm_fault.c:524 #4 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 #5 kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 ffs_read+0x3d2 sys/ufs/ffs/ffs_vnops.c:258 #9 VOP_READ+0xbf sys/kern/vfs_vops.c:247 #10 vn_read+0x124 sys/kern/vfs_vnops.c:375 #11 dofilereadv+0x1a1 sys/kern/sys_generic.c:237 #12 sys_read+0x83 sys/kern/sys_generic.c:157 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #14 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x69c witness_lock_order_check sys/kern/subr_witness.c:2442 [inline] #0 witness_checkorder+0x69c sys/kern/subr_witness.c:873 #1 rw_enter+0xd4 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #5 uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1196 #6 uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 #7 uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 #8 uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 #9 uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 #10 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #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(fffffd806fc14928,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_checkorder(fffffd806fc14928,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1087 rw_enter(fffffd806fc14918,81) at rw_enter+0xd4 rrw_enter(fffffd806fc14918,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd806fc15770,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 vn_lock(fffffd806fc15770,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:575 uvn_io(fffffd806df11680,ffff800020b2f268,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806df11680,0,ffff800020b2f4c0,ffff800020b2f454,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd806e9aa2e8,20002000,2,3) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e9aa2e8,20002000,20003000,3) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e9aa2e8,fffffd806e364ee0,fffffd806e364268,0,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a7cea8,ffff800020b2f6b8,ffff800020b2f700) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800020b2f780) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020b2f780) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x54099eddc10, count: -14 ddb{1}> show registers rdi 0x3 rsi 0xffffffff82502c30 __sancov_gen_cov_switch_values.129 rbp 0xffff800020b2eee0 rbx 0x3 rdx 0x8b rcx 0x3 rax 0x3 r8 0xffffffff81c63a92 witness_checkorder+0xfe2 r9 0x5 r10 0xc482c5aafc79c714 r11 0xc536319cb6e13d53 r12 0xfffffd80029a82c0 r13 0 r14 0xffffffff82623050 w_lodata+0x4f470 r15 0xffffffff82627d50 w_lodata+0x54170 rip 0xffffffff8219a9e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b2eed0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor8489) pid=135360 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020a7c008,0xffffffff82682e08 process=0xffff800020a903d0 user=0xffff800020b2a000, vmspace=0xfffffd806e9aa2e8 estcpu=2, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 64560 92526 63025 0 7 0 syz-executor8489 64560 19696 63025 0 2 0x4000000 syz-executor8489 *64560 135360 63025 0 7 0x4000000 syz-executor8489 63025 397455 84687 0 3 0x82 nanosleep syz-executor8489 84687 153080 28809 0 3 0x10008a pause ksh 28809 522366 6307 0 3 0x92 select sshd 44278 140188 1 0 3 0x100083 ttyin getty 6307 8296 1 0 3 0x80 select sshd 65752 386093 93819 74 3 0x100092 bpf pflogd 93819 90295 1 0 3 0x80 netio pflogd 28084 106759 27592 73 3 0x100090 kqread syslogd 27592 370625 1 0 3 0x100082 netio syslogd 21612 346799 1 77 3 0x100090 poll dhclient 52296 125603 1 0 3 0x80 poll dhclient 26393 47549 0 0 3 0x14200 bored smr 81580 388517 0 0 3 0x14200 pgzero zerothread 13202 338080 0 0 3 0x14200 aiodoned aiodoned 94690 501905 0 0 3 0x14200 syncer update 59420 52740 0 0 3 0x14200 cleaner cleaner 39232 235718 0 0 3 0x14200 reaper reaper 31946 109140 0 0 3 0x14200 pgdaemon pagedaemon 77512 234566 0 0 3 0x14200 bored crynlk 64730 375484 0 0 3 0x14200 bored crypto 84125 213551 0 0 3 0x40014200 acpi0 acpi0 86373 179671 0 0 3 0x40014200 idle1 56647 105072 0 0 3 0x14200 bored softnet 96461 178433 0 0 3 0x14200 bored systqmp 25483 50107 0 0 3 0x14200 bored systq 50190 440363 0 0 3 0x40014200 bored softclock 25616 278632 0 0 3 0x40014200 idle0 1 391902 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 64560 (syz-executor8489) thread 0xffff800020a7cea8 (135360) shared rwlock vmmaplk r = 0 (0xfffffd806e9aa300) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0x111 sys/uvm/uvm_map.c:5409 #3 uvm_map_pageable+0x11d sys/uvm/uvm_map.c:2454 #4 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82641eb8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9462 6393K 6394K 78643K 10553 0 pcb 13 8K 8K 78643K 13 0 rtable 61 2K 2K 78643K 127 0 ifaddr 29 8K 8K 78643K 30 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1467 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 1 0K 0K 78643K 1 0 proc 59 63K 71K 78643K 358 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 177 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 65 3K 4K 78643K 807 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 4 0K 0K 78643K 4 0 temp 24 3009K 3073K 78643K 1665 0 kqueue 2 2K 2K 78643K 2 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 2 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 29 0 23 1 0 1 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 8 0 2 1 0 1 1 0 8 0 pfstkey 112 8 0 2 1 0 1 1 0 8 0 pfstate 328 8 0 2 1 0 1 1 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 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1401 0 16 45 0 45 45 0 8 0 ffsino 272 1401 0 16 93 0 93 93 0 8 0 nchpl 144 1578 0 35 58 0 58 58 0 8 0 uvmvnodes 72 1411 0 0 26 0 26 26 0 8 0 vnodes 208 1411 0 0 75 0 75 75 0 8 0 namei 1024 3749 0 3749 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2917 0 2917 9 8 1 7 0 8 1 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 424 222 0 193 4 0 4 4 0 8 0 futexpl 56 5 0 5 1 0 1 1 0 8 1 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 144 1 0 0 1 0 1 1 0 8 0 pipelkpl 48 64 0 60 2 1 1 1 0 8 0 pipepl 120 128 0 121 2 1 1 1 0 8 0 fdescpl 496 207 0 193 3 0 3 3 0 8 0 filepl 152 966 0 916 2 0 2 2 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 112 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 52 0 43 1 0 1 1 0 8 0 zombiepl 144 193 0 193 2 1 1 1 0 8 1 processpl 960 222 0 193 4 0 4 4 0 8 0 procpl 624 227 0 196 3 0 3 3 0 8 0 sockpl 400 73 0 55 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 73 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 110 0 0 6 0 6 6 0 8 0 bufpl 280 1857 0 79 127 0 127 127 0 8 0 anonpl 16 19277 0 18009 7 1 6 7 0 124 0 amapchunkpl 152 537 0 494 2 0 2 2 0 158 0 amappl16 192 83 0 79 1 0 1 1 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 1 0 1 1 1 0 1 0 8 0 amappl13 168 14 0 13 2 1 1 1 0 8 0 amappl12 160 1 0 1 1 1 0 1 0 8 0 amappl11 152 69 0 51 1 0 1 1 0 8 0 amappl10 144 7 0 5 1 0 1 1 0 8 0 amappl9 136 222 0 221 1 0 1 1 0 8 0 amappl8 128 239 0 236 1 0 1 1 0 8 0 amappl7 120 92 0 84 1 0 1 1 0 8 0 amappl6 112 15 0 15 2 1 1 1 0 8 1 amappl5 104 161 0 146 1 0 1 1 0 8 0 amappl4 96 482 0 454 1 0 1 1 0 8 0 amappl3 88 96 0 90 1 0 1 1 0 8 0 amappl2 80 825 0 765 3 1 2 2 0 8 0 amappl1 72 14254 0 13826 16 6 10 16 0 8 0 amappl 80 416 0 392 1 0 1 1 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 207 0 193 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 207 0 193 1 0 1 1 0 8 0 vmmpekpl 168 5414 0 5391 2 0 2 2 0 8 0 vmmpepl 168 29336 0 28450 53 14 39 51 0 357 0 vmsppl 368 206 0 193 2 0 2 2 0 8 0 pdppl 4096 421 0 386 5 0 5 5 0 8 0 pvpl 32 79642 0 76609 31 3 28 28 0 265 1 pmappl 232 206 0 193 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 138 0 4 4 0 4 4 0 8 0