login: witness: lock order reversal: 1st 0xfffffd806e7b68c0 vmmaplk (&map->lock) 2nd 0xfffffd807bbd65f8 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:2441 [inline] #0 witness_checkorder+0x69c sys/kern/subr_witness.c:872 #1 rw_enter+0xd4 #2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5387 #3 uvm_map+0x2da sys/uvm/uvm_map.c:1226 #4 km_alloc+0x18b sys/uvm/uvm_km.c:908 #5 pool_multi_alloc_ni+0xd0 sys/kern/subr_pool.c:1692 #6 pool_p_alloc+0x74 pool_allocator_alloc sys/kern/subr_pool.c:1606 [inline] #6 pool_p_alloc+0x74 sys/kern/subr_pool.c:927 #7 pool_do_get+0x10f sys/kern/subr_pool.c:712 #8 pool_get+0xeb sys/kern/subr_pool.c:581 #9 ufsdirhash_build+0x3ea sys/ufs/ufs/ufs_dirhash.c:180 #10 ufs_lookup+0x2a1 sys/ufs/ufs/ufs_lookup.c:200 #11 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #12 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #13 namei+0x63c sys/kern/vfs_lookup.c:249 #14 start_init+0xc9 check_console sys/kern/init_main.c:596 [inline] #14 start_init+0xc9 sys/kern/init_main.c:636 #15 proc_trampoline+0x1c 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:2441 [inline] #0 witness_checkorder+0x69c sys/kern/subr_witness.c:872 #1 rw_enter+0xd4 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #5 uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 #6 uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 #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:2349 #10 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 #11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #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(fffffd807bbd65f8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd807bbd65f8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd807bbd65e8,81) at rw_enter+0xd4 rrw_enter(fffffd807bbd65e8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd807bbd7020,81) at VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615 vn_lock(fffffd807bbd7020,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd806dc8e488,ffff800020b13598,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd806dc8e488,0,ffff800020b137f0,ffff800020b13784,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e7b68a8,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e7b68a8,20002000,20005000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e7b68a8,fffffd806f0d5ee8,fffffd806f0d5d98,0,ffffffff81697ed7,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2349 sys_mlock(ffff800020ad0010,ffff800020b139e8,ffff800020b13a30) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800020b13ab0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b13ab0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff8f80, count: -14 ddb{0}> show registers rdi 0x3 rsi 0xffffffff82481ba0 __sancov_gen_cov_switch_values.129 rbp 0xffff800020b13210 rbx 0x3 rdx 0x8b rcx 0x3 rax 0x3 r8 0xffffffff81695cd2 witness_checkorder+0xfe2 r9 0x5 r10 0x24d4ffb43c64efd7 r11 0x70357cb678c9c64a r12 0xfffffd80029761c0 r13 0 r14 0xffffffff825a94d0 w_lodata+0x4f3c0 r15 0xffffffff825af1a0 w_lodata+0x55090 rip 0xffffffff81dfc018 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b13200 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor3123) pid=289160 stat=onproc flags process=2 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad1158,0xffffffff8262c650 process=0xffff800020a9b190 user=0xffff800020b0e000, vmspace=0xfffffd806e7b68a8 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *93634 289160 48500 0 7 0x2 syz-executor3123 48500 226038 42850 0 3 0x10008a pause ksh 42850 438301 66890 0 3 0x92 select sshd 5978 423571 1 0 3 0x100083 ttyin getty 66890 40837 1 0 3 0x80 select sshd 24355 409436 9850 74 3 0x100092 bpf pflogd 9850 153672 1 0 3 0x80 netio pflogd 98776 213776 22504 73 3 0x100090 kqread syslogd 22504 231816 1 0 3 0x100082 netio syslogd 19784 140010 1 77 3 0x100090 poll dhclient 19335 492206 1 0 3 0x80 poll dhclient 90723 91973 0 0 3 0x14200 pgzero zerothread 13340 353420 0 0 3 0x14200 aiodoned aiodoned 8164 385459 0 0 3 0x14200 syncer update 56747 459072 0 0 3 0x14200 cleaner cleaner 65553 376222 0 0 3 0x14200 reaper reaper 98989 72977 0 0 3 0x14200 pgdaemon pagedaemon 71336 189637 0 0 3 0x14200 bored crynlk 88357 398910 0 0 3 0x14200 bored crypto 70987 79073 0 0 3 0x40014200 acpi0 acpi0 69614 219293 0 0 7 0x40014200 idle1 27410 432895 0 0 3 0x14200 bored softnet 66686 524027 0 0 3 0x14200 bored systqmp 38505 297139 0 0 3 0x14200 bored systq 73210 423173 0 0 3 0x40014200 bored softclock 2798 113912 0 0 3 0x40014200 idle0 24400 496656 0 0 3 0x14200 bored smr 1 103949 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 93634 (syz-executor3123) thread 0xffff800020ad0010 (289160) shared rwlock vmmaplk r = 0 (0xfffffd806e7b68c0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5387 #3 uvm_map_pageable+0x11d sys/uvm/uvm_map.c:2445 #4 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82626000) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9461 6393K 6394K 78643K 10552 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 1181 74K 74K 78643K 1186 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 18 79K 79K 78643K 18 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 67 3K 4K 78643K 816 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 27 3003K 3067K 78643K 1978 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 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 1 0 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 0 1 0 1 1 0 8 0 pfstkey 112 8 0 0 1 0 1 1 0 8 0 pfstate 328 8 0 0 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 1403 0 16 45 0 45 45 0 8 0 ffsino 272 1403 0 16 93 0 93 93 0 8 0 nchpl 144 1578 0 34 58 0 58 58 0 8 0 uvmvnodes 72 1413 0 0 26 0 26 26 0 8 0 vnodes 208 1413 0 0 75 0 75 75 0 8 0 namei 1024 3774 0 3774 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2524 0 2524 2 1 1 2 0 8 1 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 432 204 0 192 2 0 2 2 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 160 128 0 121 1 0 1 1 0 8 0 fdescpl 488 205 0 192 3 0 3 3 0 8 0 filepl 152 997 0 948 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 144 192 0 192 1 0 1 1 0 8 1 processpl 896 220 0 192 4 0 4 4 0 8 0 procpl 632 220 0 192 3 0 3 3 0 8 0 sockpl 384 73 0 55 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 56 0 0 7 0 7 7 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 81 0 0 5 0 5 5 0 8 0 bufpl 280 2200 0 274 138 0 138 138 0 8 0 anonpl 16 19206 0 17967 7 1 6 7 0 125 0 amapchunkpl 152 522 0 485 2 0 2 2 0 158 0 amappl16 192 30 0 28 1 0 1 1 0 8 0 amappl15 184 50 0 46 1 0 1 1 0 8 0 amappl14 176 15 0 14 1 0 1 1 0 8 0 amappl12 160 3 0 3 1 0 1 1 0 8 1 amappl11 152 51 0 35 1 0 1 1 0 8 0 amappl10 144 5 0 2 1 0 1 1 0 8 0 amappl9 136 419 0 418 1 0 1 1 0 8 0 amappl8 128 68 0 64 1 0 1 1 0 8 0 amappl7 120 76 0 68 1 0 1 1 0 8 0 amappl6 112 47 0 45 1 0 1 1 0 8 0 amappl5 104 126 0 112 1 0 1 1 0 8 0 amappl4 96 459 0 434 1 0 1 1 0 8 0 amappl3 88 109 0 102 1 0 1 1 0 8 0 amappl2 80 820 0 765 2 0 2 2 0 8 0 amappl1 72 14029 0 13606 15 5 10 15 0 8 0 amappl 80 408 0 387 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 24 205 0 192 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 205 0 192 1 0 1 1 0 8 0 vmmpekpl 168 5344 0 5323 1 0 1 1 0 8 0 vmmpepl 168 29611 0 28762 49 8 41 49 0 357 1 vmsppl 368 204 0 192 2 0 2 2 0 8 0 pdppl 4096 417 0 384 5 0 5 5 0 8 0 pvpl 32 79469 0 76468 29 0 29 29 0 265 2 pmappl 232 204 0 192 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 129 0 3 4 0 4 4 0 8 0