witness: lock order reversal: 1st 0xfffffd807f004468 vmmaplk (&map->lock) 2nd 0xfffffd806e3c92c8 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(fffffd806e3c92c8,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd806e3c92c8,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd806e3c92b8,81) at rw_enter+0xd4 rrw_enter(fffffd806e3c92b8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd807d34a688,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd807d34a688,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8076b910f0,ffff800024f83918,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8076b910f0,0,ffff800024f83b70,ffff800024f83b04,0,0) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f004450,20002000,2,2) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f004450,20002000,20005000,2) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f004450,fffffd8068915418,fffffd8068915a00,ffff800022d48000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a98a50,ffff800024f83d68,ffff800024f83db0) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800024f83e30) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800024f83e30) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbd66413c5f0, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024f83590 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d48000 rax 0xffff800000aa1480 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xbb4455736656d7c6 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825e4a10 w_lodata+0x3dca0 r15 0xffffffff825fbeb0 w_lodata+0x55140 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024f83580 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=516441 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a991b8,0xffffffff82659068 process=0xffff800020aa23a0 user=0xffff800024f7e000, vmspace=0xfffffd807f004450 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 73189 505493 21423 32767 2 0x10 syz-executor.0 *73189 516441 21423 32767 7 0x4000010 syz-executor.0 5354 94225 2964 32767 3 0x10 biowait syz-executor.1 2964 339502 33486 0 3 0x82 wait syz-executor.1 21423 105630 82253 32767 3 0x90 nanosleep syz-executor.0 82253 377806 33486 0 3 0x82 wait syz-executor.0 81479 449073 0 0 3 0x14200 bored sosplice 33486 212542 67119 0 3 0x82 nanosleep syz-fuzzer 33486 338413 67119 0 3 0x4000082 nanosleep syz-fuzzer 33486 277762 67119 0 3 0x4000082 thrsleep syz-fuzzer 33486 231686 67119 0 7 0x4000002 syz-fuzzer 33486 266808 67119 0 3 0x4000082 thrsleep syz-fuzzer 33486 422797 67119 0 3 0x4000082 thrsleep syz-fuzzer 33486 356544 67119 0 3 0x4000082 thrsleep syz-fuzzer 33486 95846 67119 0 3 0x4000082 kqread syz-fuzzer 33486 311358 67119 0 3 0x4000082 thrsleep syz-fuzzer 33486 159202 67119 0 3 0x4000082 thrsleep syz-fuzzer 67119 160900 38936 0 3 0x10008a pause ksh 38936 22458 51909 0 3 0x92 select sshd 45204 228115 1 0 3 0x100083 ttyin getty 51909 234156 1 0 3 0x80 select sshd 39061 235748 62191 73 3 0x100090 kqread syslogd 62191 53451 1 0 3 0x100082 netio syslogd 48481 244736 1 77 3 0x100090 poll dhclient 18478 124756 1 0 3 0x80 poll dhclient 87804 184696 0 0 2 0x14200 zerothread 23631 277703 0 0 3 0x14200 aiodoned aiodoned 75965 457875 0 0 3 0x14200 syncer update 69226 359738 0 0 3 0x14200 cleaner cleaner 89024 299310 0 0 3 0x14200 reaper reaper 41394 318517 0 0 3 0x14200 pgdaemon pagedaemon 11055 195785 0 0 3 0x14200 bored crynlk 8293 50360 0 0 3 0x14200 bored crypto 55285 49909 0 0 3 0x14200 bored viomb 92264 490471 0 0 3 0x40014200 acpi0 acpi0 14857 510612 0 0 3 0x40014200 idle1 76845 280205 0 0 3 0x14200 bored softnet 41526 125543 0 0 3 0x14200 bored systqmp 5242 488161 0 0 3 0x14200 bored systq 56197 84972 0 0 3 0x40014200 bored softclock 99924 114036 0 0 3 0x40014200 idle0 26640 69405 0 0 3 0x14200 bored smr 1 350842 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 73189 (syz-executor.0) thread 0xffff800020a98a50 (516441) shared rwlock vmmaplk r = 0 (0xfffffd807f004468) #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 (0xffffffff82657328) #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 5354 (syz-executor.1) thread 0xffff800020aa1658 (94225) exclusive rrwlock inode r = 0 (0xfffffd806e3c6d58) #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 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1352 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:2974 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ec10920) #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 domkdirat+0x75 sys/kern/vfs_syscalls.c:2959 #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 9494 6343K 6343K 78643K 11541 0 pcb 13 10K 12K 78643K 15 0 rtable 107 3K 3K 78643K 10571 0 ifaddr 39 13K 14K 78643K 1751 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 532 0 iov 0 0K 64K 78643K 2588 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 7037 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 178 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 6801 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 7 21K 33K 78643K 11392 0 sigio 0 0K 0K 78643K 438 0 proc 48 50K 83K 78643K 11884 0 subproc 34 2K 2K 78643K 4097 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 2566 0 in_multi 33 2K 2K 78643K 3039 0 ether_multi 1 0K 0K 78643K 40 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 150 662K 662K 78643K 150 0 exec 0 0K 1K 78643K 4474 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 219 37K 38K 78643K 44332 0 UVM aobj 130 4K 4K 78643K 138 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 981 0 NDP 7 0K 0K 78643K 726 0 temp 106 3034K 3146K 78643K 55197 0 kqueue 0 0K 0K 78643K 448 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 64 530 0 523 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 2254 0 2252 1 0 1 1 0 8 0 rtentry 112 2481 0 2436 2 0 2 2 0 8 0 unpcb 120 11831 0 11813 49 48 1 3 0 8 0 syncache 264 108 0 108 46 45 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 203 0 203 27 26 1 1 0 8 1 tcpcb 544 7944 0 7939 139 138 1 13 0 8 0 ipq 40 197 0 197 59 59 0 1 0 8 0 ipqe 40 6529 0 6529 59 59 0 1 0 8 0 inpcb 280 20531 0 20521 113 111 2 9 0 8 1 ip6q 72 14 0 14 8 8 0 1 0 8 0 ip6af 40 35 0 35 8 8 0 1 0 8 0 nd6 48 482 0 478 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 10813 0 10596 15 1 14 14 0 8 0 art_table 32 10814 0 10596 2 0 2 2 0 8 0 art_node 16 2480 0 2439 1 0 1 1 0 8 0 sysvmsgpl 40 71 0 31 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 6789 0 6779 1 0 1 1 0 8 0 shmpl 112 136 0 8 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 14984 0 13557 48 1 47 47 0 8 0 ffsino 272 14984 0 13557 96 0 96 96 0 8 0 nchpl 144 30473 0 28847 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 158773 0 158772 9 8 1 2 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 118357 0 118356 112 111 1 7 0 8 0 plimitpl 152 2231 0 2222 1 0 1 1 0 8 0 sigapl 432 10846 0 10831 14 12 2 3 0 8 0 futexpl 56 303007 0 303007 6 5 1 1 0 8 1 knotepl 112 6796 0 6777 39 38 1 3 0 8 0 kqueuepl 104 8446 0 8444 36 35 1 4 0 8 0 pipepl 160 10480 0 10461 48 46 2 3 0 8 1 fdescpl 488 10847 0 10831 5 2 3 3 0 8 0 filepl 152 131992 0 131887 193 187 6 14 0 8 1 lockfpl 104 3519 0 3518 1 0 1 1 0 8 0 lockfspl 48 1071 0 1070 1 0 1 1 0 8 0 sessionpl 112 256 0 246 1 0 1 1 0 8 0 pgrppl 48 426 0 416 1 0 1 1 0 8 0 ucredpl 96 25054 0 25045 1 0 1 1 0 8 0 zombiepl 144 10831 0 10831 7 6 1 1 0 8 1 processpl 904 10864 0 10831 15 11 4 5 0 8 0 procpl 632 32380 0 32337 15 10 5 5 0 8 0 srpgc 64 478 0 478 65 64 1 1 0 8 1 sosppl 128 360 0 360 58 58 0 1 0 8 0 sockpl 384 34945 0 34917 236 231 5 15 0 8 0 mcl64k 65536 90 0 0 6 3 3 4 0 8 0 mcl16k 16384 41 0 0 6 3 3 3 0 8 0 mcl12k 12288 81 0 0 2 0 2 2 0 8 0 mcl9k 9216 65 0 0 5 3 2 2 0 8 0 mcl8k 8192 50 0 0 5 2 3 3 0 8 0 mcl4k 4096 32 0 0 4 1 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 348 0 0 33 18 15 33 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1904 0 0 48 1 47 47 0 8 0 bufpl 280 46197 0 39131 506 0 506 506 0 8 0 anonpl 16 1658883 0 1644418 336 261 75 81 0 125 2 amapchunkpl 152 112972 0 112726 275 265 10 19 0 158 0 amappl16 192 56737 0 55861 391 335 56 58 0 8 8 amappl15 184 1623 0 1619 1 0 1 1 0 8 0 amappl14 176 3361 0 3354 1 0 1 1 0 8 0 amappl13 168 1233 0 1231 27 26 1 1 0 8 0 amappl12 160 1057 0 1051 2 1 1 1 0 8 0 amappl11 152 1739 0 1728 1 0 1 1 0 8 0 amappl10 144 1599 0 1593 2 1 1 1 0 8 0 amappl9 136 4558 0 4555 1 0 1 1 0 8 0 amappl8 128 3294 0 3171 8 3 5 5 0 8 0 amappl7 120 2961 0 2945 1 0 1 1 0 8 0 amappl6 112 1144 0 1126 1 0 1 1 0 8 0 amappl5 104 3009 0 3000 1 0 1 1 0 8 0 amappl4 96 11093 0 11054 5 4 1 2 0 8 0 amappl3 88 3111 0 3103 1 0 1 1 0 8 0 amappl2 80 69146 0 69065 3 1 2 3 0 8 0 amappl1 72 313243 0 312794 24 14 10 20 0 8 0 amappl 80 36832 0 36791 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 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 64 137 0 8 3 0 3 3 0 8 0 uaddrrnd 24 10847 0 10831 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10847 0 10831 1 0 1 1 0 8 0 vmmpekpl 168 109239 0 109210 2 0 2 2 0 8 0 vmmpepl 168 1571308 0 1569058 641 506 135 149 0 357 21 vmsppl 368 10846 0 10831 2 0 2 2 0 8 0 pdppl 4096 21701 0 21662 8 2 6 6 0 8 0 pvpl 32 4308939 0 4291695 813 630 183 199 0 265 19 pmappl 232 10846 0 10831 39 38 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 393 0 190 6 0 6 6 0 8 0