witness: lock order reversal: 1st 0xfffffd807f005018 vmmaplk (&map->lock) 2nd 0xfffffd8062444700 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{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(fffffd8062444700,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8062444700,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd80624446f0,81) at rw_enter+0xd4 rrw_enter(fffffd80624446f0,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8061bdd0e0,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8061bdd0e0,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd8061cc1b98,ffff800021b9b0d8,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd8061cc1b98,2000,ffff800021b9b330,ffff800021b9b2c4,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd807f005000,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd807f005000,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd807f005000,fffffd8065e5c5a0,fffffd8065e5cc30,ffff800022d7e000,ffffffff8211d1e7,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a99b40,ffff800021b9b528,ffff800021b9b570) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800021b9b5f0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021b9b5f0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xcfe45d5c70, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021b9ad50 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d7e000 rax 0xffff8000009ca700 r8 0xffffffff8211afe2 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0xe9bb4384a79faeb8 r12 0xfffffd800297c100 r13 0 r14 0xffffffff825fb510 w_lodata+0x4bab0 r15 0xffffffff82604ba0 w_lodata+0x55140 rip 0xffffffff815de968 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021b9ad40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=2989 stat=onproc flags process=0 proc=4000000 pri=68, usrpri=68, nice=20 forw=0xffffffffffffffff, list=0xffff800020a99160,0xffff800020a993e8 process=0xffff800020aa3548 user=0xffff800021b96000, vmspace=0xfffffd807f005000 estcpu=18, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 69597 157612 59200 0 2 0 syz-executor.0 69597 513021 59200 0 2 0x4000000 syz-executor.0 4813 78977 27678 0 7 0 syz-executor.1 * 4813 2989 27678 0 7 0x4000000 syz-executor.1 2618 399714 0 0 3 0x14200 bored sosplice 27678 334624 20445 0 3 0x82 nanosleep syz-executor.1 59200 308816 20445 0 3 0x82 nanosleep syz-executor.0 20445 115154 67841 0 3 0x82 thrsleep syz-fuzzer 20445 42409 67841 0 3 0x4000082 nanosleep syz-fuzzer 20445 274184 67841 0 3 0x4000082 thrsleep syz-fuzzer 20445 334625 67841 0 3 0x4000082 thrsleep syz-fuzzer 20445 304746 67841 0 3 0x4000082 thrsleep syz-fuzzer 20445 478520 67841 0 3 0x4000082 thrsleep syz-fuzzer 20445 54527 67841 0 3 0x4000082 thrsleep syz-fuzzer 20445 387766 67841 0 3 0x4000082 kqread syz-fuzzer 20445 74269 67841 0 3 0x4000082 thrsleep syz-fuzzer 20445 181866 67841 0 3 0x4000082 thrsleep syz-fuzzer 67841 116700 48810 0 3 0x10008a pause ksh 48810 503531 66852 0 3 0x92 select sshd 72906 377432 1 0 3 0x100083 ttyin getty 66852 117620 1 0 3 0x80 select sshd 42591 23029 30263 74 3 0x100092 bpf pflogd 30263 126028 1 0 3 0x80 netio pflogd 59977 524203 63623 73 3 0x100090 kqread syslogd 63623 213582 1 0 3 0x100082 netio syslogd 74107 481102 1 77 3 0x100090 poll dhclient 77642 34654 1 0 3 0x80 poll dhclient 18164 177892 0 0 2 0x14200 zerothread 31173 48661 0 0 3 0x14200 aiodoned aiodoned 25755 115985 0 0 3 0x14200 syncer update 56807 31150 0 0 3 0x14200 cleaner cleaner 57893 160017 0 0 3 0x14200 reaper reaper 844 438959 0 0 3 0x14200 pgdaemon pagedaemon 93806 27476 0 0 3 0x14200 bored crynlk 47548 425629 0 0 3 0x14200 bored crypto 58533 147497 0 0 3 0x14200 bored viomb 82980 347772 0 0 3 0x40014200 acpi0 acpi0 29450 283218 0 0 3 0x40014200 idle1 1635 71357 0 0 3 0x14200 bored softnet 61298 189393 0 0 3 0x14200 bored systqmp 77917 369564 0 0 3 0x14200 bored systq 56515 370338 0 0 3 0x40014200 bored softclock 36956 67876 0 0 3 0x40014200 idle0 10081 239487 0 0 3 0x14200 bored smr 1 268889 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 4813 (syz-executor.1) thread 0xffff800020a99b40 (2989) shared rwlock vmmaplk r = 0 (0xfffffd807f005018) #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 (0xffffffff8265cfc8) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9499 6421K 7323K 78643K 10834 0 pcb 13 8K 8K 78643K 37 0 rtable 108 4K 4K 78643K 223 0 ifaddr 57 12K 12K 78643K 68 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1469 0 iov 0 0K 12K 78643K 17 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1292 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 50 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 6 17K 25K 78643K 111 0 sigio 0 0K 0K 78643K 1 0 proc 60 63K 83K 78643K 441 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 13 0 in_multi 47 2K 3K 78643K 50 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 48 212K 212K 78643K 48 0 exec 0 0K 1K 78643K 227 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 115 22K 23K 78643K 1313 0 UVM aobj 14 2K 2K 78643K 14 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 16 0 NDP 8 0K 0K 78643K 14 0 temp 86 3022K 3089K 78643K 4957 0 kqueue 0 0K 0K 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 25 0 23 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 235 0 225 1 0 1 1 0 8 0 syncache 264 6 0 6 2 1 1 1 0 8 1 tcpqe 32 41 0 41 1 0 1 1 0 8 1 tcpcb 544 66 0 62 1 0 1 1 0 8 0 inpcb 280 255 0 248 3 0 3 3 0 8 2 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 2 0 2 1 0 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 19 0 0 1 0 1 1 0 8 0 pfstkey 112 19 0 0 1 0 1 1 0 8 0 pfstate 328 19 0 0 2 0 2 2 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 256 212 0 0 14 0 14 14 0 8 0 art_table 32 213 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 10 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 48 0 38 1 0 1 1 0 8 0 shmpl 112 12 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1554 0 146 46 0 46 46 0 8 0 ffsino 272 1554 0 146 95 0 95 95 0 8 0 nchpl 144 1903 0 284 61 0 61 61 0 8 0 uvmvnodes 72 1660 0 0 31 0 31 31 0 8 0 vnodes 208 1660 0 0 88 0 88 88 0 8 0 namei 1024 5041 0 5041 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 5440 0 5440 8 1 7 7 0 8 7 plimitpl 152 21 0 13 1 0 1 1 0 8 0 sigapl 432 310 0 294 3 1 2 3 0 8 0 futexpl 56 2243 0 2243 1 0 1 1 0 8 1 knotepl 112 61 0 42 1 0 1 1 0 8 0 kqueuepl 104 20 0 18 1 0 1 1 0 8 0 pipepl 160 202 0 183 2 0 2 2 0 8 1 fdescpl 488 311 0 294 3 0 3 3 0 8 0 filepl 152 2058 0 1956 6 0 6 6 0 8 2 lockfpl 104 65 0 63 1 0 1 1 0 8 0 lockfspl 48 21 0 19 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 97 0 88 1 0 1 1 0 8 0 zombiepl 144 294 0 294 1 0 1 1 0 8 1 processpl 904 328 0 294 4 0 4 4 0 8 0 procpl 632 528 0 483 5 0 5 5 0 8 1 sockpl 384 517 0 498 5 0 5 5 0 8 3 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 176 0 0 21 0 21 21 0 8 0 mtagpl 80 4 0 0 1 0 1 1 0 8 0 mbufpl 256 190 0 0 12 0 12 12 0 8 0 bufpl 280 6539 0 1340 372 0 372 372 0 8 0 anonpl 16 48875 0 29330 81 1 80 80 0 125 1 amapchunkpl 152 1651 0 1500 11 0 11 11 0 158 4 amappl16 192 1482 0 407 54 0 54 54 0 8 0 amappl15 184 59 0 54 1 0 1 1 0 8 0 amappl14 176 35 0 33 1 0 1 1 0 8 0 amappl13 168 41 0 38 1 0 1 1 0 8 0 amappl12 160 4 0 3 2 1 1 1 0 8 0 amappl11 152 52 0 37 1 0 1 1 0 8 0 amappl10 144 16 0 9 1 0 1 1 0 8 0 amappl9 136 648 0 642 1 0 1 1 0 8 0 amappl8 128 169 0 140 2 0 2 2 0 8 0 amappl7 120 105 0 93 1 0 1 1 0 8 0 amappl6 112 55 0 51 1 0 1 1 0 8 0 amappl5 104 130 0 116 1 0 1 1 0 8 0 amappl4 96 597 0 566 1 0 1 1 0 8 0 amappl3 88 123 0 115 1 0 1 1 0 8 0 amappl2 80 1575 0 1493 3 1 2 3 0 8 0 amappl1 72 16792 0 16330 25 15 10 20 0 8 0 amappl 80 783 0 737 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 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 311 0 294 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 311 0 294 1 0 1 1 0 8 0 vmmpekpl 168 6466 0 6436 2 0 2 2 0 8 0 vmmpepl 168 45954 0 43593 138 6 132 135 0 357 29 vmsppl 368 310 0 294 2 0 2 2 0 8 0 pdppl 4096 629 0 588 6 0 6 6 0 8 0 pvpl 32 158719 0 135438 188 0 188 188 0 265 0 pmappl 232 310 0 294 2 1 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 169 0 3 5 0 5 5 0 8 0