witness: lock order reversal: 1st 0xfffffd806e8bd470 vmmaplk (&map->lock) 2nd 0xfffffd806b49de78 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(fffffd806b49de78,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd806b49de78,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd806b49de68,81) at rw_enter+0xd4 rrw_enter(fffffd806b49de68,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8066f45d00,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8066f45d00,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd807394cc68,ffff800022d54cc8,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd807394cc68,1000,ffff800022d54f20,ffff800022d54eb4,0,2) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8bd458,20001000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8bd458,20000000,20003000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8bd458,fffffd806b3b4d48,fffffd8067b55758,ffff800022d82000,ffffffff818b1737,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020ace780,ffff800022d55118,ffff800022d55160) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800022d551e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d551e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6aa42455340, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022d54940 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d82000 rax 0xffff8000009f2b80 r8 0xffffffff818af532 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xc4abc3763d9e82f6 r12 0xfffffd800297c200 r13 0 r14 0xffffffff825eae00 w_lodata+0x3efe0 r15 0xffffffff82601010 w_lodata+0x551f0 rip 0xffffffff811551c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d54930 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=321884 stat=onproc flags process=10 proc=4000000 pri=81, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020acf160,0xffffffff82616060 process=0xffff800020a9b1b8 user=0xffff800022d50000, vmspace=0xfffffd806e8bd458 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71217 325836 66815 32767 7 0x10 syz-executor.1 *71217 321884 66815 32767 7 0x4000010 syz-executor.1 66815 283020 35711 32767 3 0x90 nanosleep syz-executor.1 35711 295004 92142 0 3 0x82 wait syz-executor.1 8584 508660 29396 32767 3 0x10 biowait syz-executor.0 29396 185867 92142 0 3 0x82 wait syz-executor.0 12421 490881 0 0 3 0x14200 bored sosplice 92142 348992 19275 0 3 0x82 thrsleep syz-fuzzer 92142 402759 19275 0 3 0x4000082 nanosleep syz-fuzzer 92142 188086 19275 0 3 0x4000082 thrsleep syz-fuzzer 92142 480692 19275 0 3 0x4000082 thrsleep syz-fuzzer 92142 332794 19275 0 3 0x4000082 thrsleep syz-fuzzer 92142 463959 19275 0 3 0x4000082 thrsleep syz-fuzzer 92142 191726 19275 0 3 0x4000082 thrsleep syz-fuzzer 92142 291774 19275 0 3 0x4000082 thrsleep syz-fuzzer 92142 32484 19275 0 3 0x4000082 thrsleep syz-fuzzer 92142 520023 19275 0 3 0x4000082 kqread syz-fuzzer 19275 378529 18010 0 3 0x10008a pause ksh 18010 363854 90473 0 3 0x92 select sshd 76407 333563 1 0 3 0x100083 ttyin getty 90473 44061 1 0 3 0x80 select sshd 14457 316074 10234 73 3 0x100090 kqread syslogd 10234 489464 1 0 3 0x100082 netio syslogd 65368 262320 1 77 3 0x100090 poll dhclient 54100 135162 1 0 3 0x80 poll dhclient 80839 356744 0 0 3 0x14200 pgzero zerothread 4816 213147 0 0 3 0x14200 aiodoned aiodoned 2808 166687 0 0 3 0x14200 syncer update 53427 164127 0 0 3 0x14200 cleaner cleaner 39581 418261 0 0 3 0x14200 reaper reaper 2713 360229 0 0 3 0x14200 pgdaemon pagedaemon 41366 123478 0 0 3 0x14200 bored crynlk 38721 93054 0 0 3 0x14200 bored crypto 85045 305879 0 0 3 0x40014200 acpi0 acpi0 67838 30411 0 0 3 0x40014200 idle1 50527 498460 0 0 3 0x14200 bored softnet 66975 501597 0 0 3 0x14200 bored systqmp 88781 9222 0 0 3 0x14200 bored systq 2091 251047 0 0 3 0x40014200 bored softclock 11822 152758 0 0 3 0x40014200 idle0 15615 290351 0 0 3 0x14200 bored smr 1 330601 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 71217 (syz-executor.1) thread 0xffff800020ace780 (321884) shared rwlock vmmaplk r = 0 (0xfffffd806e8bd470) #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 (0xffffffff82660f10) #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 Process 8584 (syz-executor.0) thread 0xffff800020ace290 (508660) exclusive rrwlock inode r = 0 (0xfffffd8063274f80) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #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 vget+0x1c8 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x14b4 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #11 namei+0x63c sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1776 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806627b700) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #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 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1776 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9491 6335K 6335K 78643K 11543 0 pcb 13 10K 12K 78643K 15 0 rtable 105 3K 3K 78643K 10552 0 ifaddr 39 13K 15K 78643K 1752 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 569 0 iov 0 0K 60K 78643K 9827 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 13624 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 147 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 11842 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 7 21K 33K 78643K 12283 0 sigio 0 0K 0K 78643K 394 0 proc 48 50K 83K 78643K 11596 0 subproc 34 2K 2K 78643K 4114 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2042 0 in_multi 33 2K 2K 78643K 2956 0 ether_multi 1 0K 0K 78643K 25 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 186 821K 821K 78643K 186 0 exec 0 0K 1K 78643K 5513 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 187 27K 35K 78643K 53031 0 UVM aobj 130 5K 5K 78643K 136 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 2016 0 NDP 9 0K 0K 78643K 729 0 temp 106 3034K 3130K 78643K 61014 0 kqueue 0 0K 0K 78643K 309 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 64 523 0 517 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 2049 0 2047 1 0 1 1 0 8 0 rtentry 112 2482 0 2438 2 0 2 2 0 8 0 unpcb 120 17960 0 17946 23 22 1 2 0 8 0 syncache 264 96 0 96 39 38 1 1 0 8 1 sackhl 24 8 0 8 7 7 0 1 0 8 0 tcpqe 32 49 0 49 26 25 1 1 0 8 1 tcpcb 544 10425 0 10419 103 102 1 13 0 8 0 ipq 40 338 0 338 49 49 0 1 0 8 0 ipqe 40 13889 0 13889 49 49 0 1 0 8 0 inpcb 280 28901 0 28892 107 105 2 10 0 8 0 ip6q 72 9 0 9 6 6 0 1 0 8 0 ip6af 40 20 0 20 6 6 0 1 0 8 0 nd6 48 484 0 480 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 10899 0 10684 14 0 14 14 0 8 0 art_table 32 10900 0 10684 2 0 2 2 0 8 0 art_node 16 2481 0 2441 1 0 1 1 0 8 0 sysvmsgpl 40 43 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 11840 0 11830 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 21759 0 20327 51 4 47 47 0 8 0 ffsino 272 21759 0 20327 104 8 96 96 0 8 0 nchpl 144 40033 0 38404 62 1 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 177112 0 177112 3 2 1 2 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 96310 0 96309 83 79 4 4 0 8 3 plimitpl 152 2011 0 2002 1 0 1 1 0 8 0 sigapl 432 11734 0 11719 7 5 2 3 0 8 0 futexpl 56 352295 0 352295 2 1 1 1 0 8 1 knotepl 112 5660 0 5641 32 31 1 3 0 8 0 kqueuepl 104 6375 0 6373 16 15 1 4 0 8 0 pipepl 160 20804 0 20785 48 46 2 3 0 8 1 fdescpl 488 11735 0 11719 3 0 3 3 0 8 0 filepl 152 164854 0 164755 153 147 6 14 0 8 2 lockfpl 104 22297 0 22295 1 0 1 1 0 8 0 lockfspl 48 7101 0 7099 1 0 1 1 0 8 0 sessionpl 112 257 0 247 1 0 1 1 0 8 0 pgrppl 48 354 0 344 1 0 1 1 0 8 0 ucredpl 96 47755 0 47746 1 0 1 1 0 8 0 zombiepl 144 11719 0 11719 2 1 1 1 0 8 1 processpl 904 11751 0 11719 4 0 4 4 0 8 0 procpl 632 41100 0 41058 12 7 5 5 0 8 1 srpgc 64 480 0 480 69 68 1 1 0 8 1 sosppl 128 241 0 241 60 60 0 1 0 8 0 sockpl 384 50501 0 50476 196 190 6 15 0 8 1 mcl64k 65536 34 0 0 3 0 3 3 0 8 0 mcl16k 16384 49 0 0 5 2 3 3 0 8 0 mcl12k 12288 71 0 0 2 0 2 2 0 8 0 mcl9k 9216 39 0 0 3 1 2 2 0 8 0 mcl8k 8192 65 0 0 6 4 2 3 0 8 0 mcl4k 4096 32 0 0 4 1 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 213 0 0 19 7 12 19 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1922 0 0 50 3 47 47 0 8 0 bufpl 280 32967 0 25901 506 0 506 506 0 8 0 anonpl 16 1791918 0 1779693 372 303 69 93 0 125 0 amapchunkpl 152 127161 0 127033 208 201 7 20 0 158 0 amappl16 192 67334 0 66475 477 429 48 66 0 8 0 amappl15 184 1814 0 1811 1 0 1 1 0 8 0 amappl14 176 4925 0 4921 1 0 1 1 0 8 0 amappl13 168 675 0 675 28 28 0 1 0 8 0 amappl12 160 994 0 990 39 38 1 1 0 8 0 amappl11 152 1732 0 1720 1 0 1 1 0 8 0 amappl10 144 679 0 675 1 0 1 1 0 8 0 amappl9 136 4864 0 4861 1 0 1 1 0 8 0 amappl8 128 3626 0 3542 4 1 3 3 0 8 0 amappl7 120 2138 0 2121 1 0 1 1 0 8 0 amappl6 112 1141 0 1127 1 0 1 1 0 8 0 amappl5 104 3013 0 3001 1 0 1 1 0 8 0 amappl4 96 10970 0 10932 15 13 2 2 0 8 1 amappl3 88 5271 0 5263 1 0 1 1 0 8 0 amappl2 80 77993 0 77916 3 1 2 3 0 8 0 amappl1 72 348577 0 348121 23 12 11 20 0 8 0 amappl 80 45625 0 45579 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 11735 0 11719 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11735 0 11719 1 0 1 1 0 8 0 vmmpekpl 168 147783 0 147754 2 0 2 2 0 8 0 vmmpepl 168 1701870 0 1699684 662 531 131 141 0 357 31 vmsppl 368 11734 0 11719 2 0 2 2 0 8 0 pdppl 4096 23477 0 23438 6 0 6 6 0 8 0 pvpl 32 4595360 0 4579392 796 616 180 217 0 265 18 pmappl 232 11734 0 11719 58 56 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 329 0 131 6 0 6 6 0 8 0