witness: lock order reversal: 1st 0xfffffd807f007018 vmmaplk (&map->lock) 2nd 0xfffffd8066917f88 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:5406 #3 uvm_map+0x2da sys/uvm/uvm_map.c:1233 #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+0xf9 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:2358 #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(fffffd8066917f88,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8066917f88,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8066917f78,81) at rw_enter+0xd4 rrw_enter(fffffd8066917f78,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8079c0bc30,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8079c0bc30,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd807841e330,ffff800021bbcb98,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd807841e330,0,ffff800021bbcdf0,ffff800021bbcd84,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f007000,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f007000,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f007000,fffffd80660d8818,fffffd80660d8770,ffff800021786000,ffffffff81621707,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a6ec60,ffff800021bbcfe8,ffff800021bbd030) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800021bbd0b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021bbd0b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3b908006a30, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021bbc810 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800021786000 rax 0xffff800000c0e8c0 r8 0xffffffff8161f502 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xf202750636009d9b r12 0xfffffd800297d200 r13 0 r14 0xffffffff825c5730 w_lodata+0x40b60 r15 0xffffffff825d9bb0 w_lodata+0x54fe0 rip 0xffffffff81e11948 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021bbc800 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=163134 stat=onproc flags process=0 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800020a6e9e8,0xffff800020ad0298 process=0xffff800020a9a720 user=0xffff800021bb8000, vmspace=0xfffffd807f007000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87535 510642 51323 0 2 0 syz-executor.0 15394 328880 21953 0 7 0x1 syz-executor.1 *15394 163134 21953 0 7 0x4000000 syz-executor.1 51323 274045 73812 0 3 0x82 nanosleep syz-executor.0 21953 409794 73812 0 3 0x82 nanosleep syz-executor.1 84325 347286 0 0 3 0x14200 acct acct 86901 32343 1 0 3 0x100083 ttyin getty 72251 222711 0 0 3 0x14200 bored sosplice 73812 218688 33307 0 3 0x82 thrsleep syz-fuzzer 73812 522359 33307 0 3 0x4000082 thrsleep syz-fuzzer 73812 509649 33307 0 3 0x4000082 thrsleep syz-fuzzer 73812 4458 33307 0 3 0x4000082 thrsleep syz-fuzzer 73812 392719 33307 0 3 0x4000082 thrsleep syz-fuzzer 73812 153389 33307 0 3 0x4000082 thrsleep syz-fuzzer 73812 191143 33307 0 3 0x4000082 thrsleep syz-fuzzer 73812 61403 33307 0 3 0x4000082 thrsleep syz-fuzzer 73812 20906 33307 0 3 0x4000082 thrsleep syz-fuzzer 73812 61553 33307 0 3 0x4000082 kqread syz-fuzzer 33307 250456 45712 0 3 0x10008a pause ksh 45712 475620 67224 0 3 0x92 select sshd 67224 444875 1 0 3 0x80 select sshd 40315 412240 32219 74 3 0x100092 bpf pflogd 32219 168051 1 0 3 0x80 netio pflogd 1797 89533 15955 73 3 0x100090 kqread syslogd 15955 191169 1 0 3 0x100082 netio syslogd 38997 340967 0 0 2 0x14200 zerothread 29046 247868 0 0 3 0x14200 aiodoned aiodoned 92787 132464 0 0 3 0x14200 syncer update 96108 52733 0 0 3 0x14200 cleaner cleaner 76333 229637 0 0 3 0x14200 reaper reaper 3688 466606 0 0 3 0x14200 pgdaemon pagedaemon 81605 311942 0 0 3 0x14200 bored crynlk 61204 53430 0 0 3 0x14200 bored crypto 17446 327722 0 0 3 0x40014200 acpi0 acpi0 63449 91824 0 0 3 0x40014200 idle1 92846 418468 0 0 3 0x14200 bored softnet 99981 90773 0 0 3 0x14200 bored systqmp 61762 196602 0 0 3 0x14200 bored systq 83616 345065 0 0 3 0x40014200 bored softclock 42024 264754 0 0 3 0x40014200 idle0 76823 84817 0 0 3 0x14200 bored smr 1 294930 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 15394 (syz-executor.1) thread 0xffff800020a6ec60 (163134) shared rwlock vmmaplk r = 0 (0xfffffd807f007018) #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:5406 #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:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8265e648) #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 9560 6637K 10508K 78643K 23232 0 pcb 13 8K 8K 78643K 226 0 rtable 98 3K 4K 78643K 1220 0 ifaddr 202 44K 45K 78643K 596 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1592 0 iov 0 0K 16K 78643K 206 0 mount 1 1K 1K 78643K 1 0 vnodes 1263 79K 80K 78643K 4940 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 21 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 340 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 3809 0 sigio 0 0K 0K 78643K 31 0 proc 56 51K 83K 78643K 959 0 subproc 32 2K 2K 78643K 221 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 162 0 in_multi 79 3K 4K 78643K 244 0 ether_multi 1 0K 0K 78643K 13 0 mrt 0 0K 0K 78643K 11 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 60 265K 265K 78643K 60 0 exec 0 0K 1K 78643K 423 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 138 23K 30K 78643K 12039 0 UVM aobj 130 6K 6K 78643K 136 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 2K 78643K 178 0 NDP 16 0K 0K 78643K 75 0 temp 157 3035K 3111K 78643K 239926 0 kqueue 0 0K 0K 78643K 2 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 64 192 0 185 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 238 0 238 5 4 1 1 0 8 1 rtentry 112 495 0 456 2 0 2 2 0 8 0 unpcb 120 3580 0 3572 4 3 1 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 226 0 226 1 1 0 1 0 8 0 tcpcb 544 2199 0 2195 2 1 1 2 0 8 0 inpcb 280 7314 0 7310 5 3 2 2 0 8 1 rttmr 72 5 0 5 2 1 1 1 0 8 1 ip6q 72 1 0 0 1 0 1 1 0 8 0 nd6 48 25 0 23 2 1 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 swfcl 56 1 0 0 1 0 1 1 0 8 0 ppxss 1128 16 0 16 4 3 1 1 0 8 1 pffrag 232 138 0 138 4 3 1 1 0 482 1 pffrnode 88 138 0 138 4 3 1 1 0 8 1 pffrent 40 6041 0 6041 4 3 1 1 0 8 1 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 77 0 30 1 0 1 1 0 8 0 pfstkey 112 77 0 30 2 0 2 2 0 8 0 pfstate 328 77 0 29 5 0 5 5 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 256 909 0 717 23 9 14 15 0 8 0 art_table 32 910 0 717 2 0 2 2 0 8 0 art_node 16 494 0 457 1 0 1 1 0 8 0 sysvmsgpl 40 39 0 37 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 338 0 328 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6084 0 4608 48 0 48 48 0 8 0 ffsino 272 6084 0 4608 99 0 99 99 0 8 0 nchpl 144 11110 0 9495 61 0 61 61 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 33549 0 33549 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 34645 0 34645 16 15 1 6 0 8 1 plimitpl 152 62 0 55 1 0 1 1 0 8 0 sigapl 432 3976 0 3962 3 1 2 3 0 8 0 futexpl 56 65668 0 65668 1 0 1 1 0 8 1 knotepl 112 229 0 210 1 0 1 1 0 8 0 kqueuepl 104 154 0 152 1 0 1 1 0 8 0 pipepl 160 946 0 927 6 5 1 2 0 8 0 fdescpl 488 3977 0 3962 3 0 3 3 0 8 0 filepl 152 26954 0 26862 11 6 5 8 0 8 1 lockfpl 104 695 0 695 3 2 1 1 0 8 1 lockfspl 48 297 0 297 3 2 1 1 0 8 1 sessionpl 112 30 0 21 1 0 1 1 0 8 0 pgrppl 48 59 0 50 1 0 1 1 0 8 0 ucredpl 96 744 0 736 1 0 1 1 0 8 0 zombiepl 144 3962 0 3962 1 0 1 1 0 8 1 processpl 904 3994 0 3962 4 0 4 4 0 8 0 procpl 632 10717 0 10675 7 3 4 5 0 8 0 srpgc 64 25 0 25 4 3 1 1 0 8 1 sosppl 128 9 0 9 3 2 1 1 0 8 1 sockpl 384 11144 0 11132 12 9 3 7 0 8 1 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 24 0 0 3 1 2 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 12 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 175 0 0 21 0 21 21 0 8 0 mtagpl 80 481 0 0 9 0 9 9 0 8 0 mbufpl 256 1090 0 0 65 1 64 64 0 8 0 bufpl 280 14396 0 7326 506 0 506 506 0 8 0 anonpl 16 332783 0 315969 105 11 94 94 0 125 11 amapchunkpl 152 21167 0 21030 24 13 11 14 0 158 3 amappl16 192 16343 0 15208 72 7 65 69 0 8 8 amappl15 184 1316 0 1313 1 0 1 1 0 8 0 amappl14 176 850 0 843 1 0 1 1 0 8 0 amappl13 168 1 0 0 1 0 1 1 0 8 0 amappl12 160 1300 0 1297 1 0 1 1 0 8 0 amappl11 152 821 0 813 1 0 1 1 0 8 0 amappl10 144 162 0 158 1 0 1 1 0 8 0 amappl9 136 748 0 745 1 0 1 1 0 8 0 amappl8 128 277 0 232 2 0 2 2 0 8 0 amappl7 120 308 0 293 1 0 1 1 0 8 0 amappl6 112 794 0 785 1 0 1 1 0 8 0 amappl5 104 1516 0 1505 1 0 1 1 0 8 0 amappl4 96 3198 0 3159 2 1 1 2 0 8 0 amappl3 88 2040 0 2022 1 0 1 1 0 8 0 amappl2 80 30887 0 30811 3 1 2 3 0 8 0 amappl1 72 90937 0 90498 26 16 10 21 0 8 0 amappl 80 11164 0 11123 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 64 135 0 6 3 0 3 3 0 8 0 uaddrrnd 24 3977 0 3962 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3977 0 3962 1 0 1 1 0 8 0 vmmpekpl 168 28582 0 28547 2 0 2 2 0 8 0 vmmpepl 168 482192 0 479808 188 43 145 145 0 357 38 vmsppl 368 3976 0 3962 2 0 2 2 0 8 0 pdppl 4096 7961 0 7924 6 1 5 6 0 8 0 pvpl 32 954646 0 934493 241 23 218 219 0 265 26 pmappl 232 3976 0 3962 2 1 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 243 0 16 7 0 7 7 0 8 0