witness: lock order reversal: 1st 0xfffffd806e8a5750 vmmaplk (&map->lock) 2nd 0xfffffd8077758f78 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(fffffd8077758f78,9,0) at witness_checkorder+0x1009 witness_debugger sys/kern/subr_witness.c:2504 [inline] witness_checkorder(fffffd8077758f78,9,0) at witness_checkorder+0x1009 sys/kern/subr_witness.c:1086 rw_enter(fffffd8077758f68,81) at rw_enter+0xd4 rrw_enter(fffffd8077758f68,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453 VOP_LOCK(fffffd8079695680,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 vn_lock(fffffd8079695680,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571 uvn_io(fffffd806757b5a8,ffff800022d58cc8,1,2,0) at uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189 uvn_get(fffffd806757b5a8,0,ffff800022d58f20,ffff800022d58eb4,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1049 uvm_fault(fffffd806e8a5738,20002000,2,1) at uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023 uvm_fault_wire(fffffd806e8a5738,20002000,20003000,1) at uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295 uvm_map_pageable_wire(fffffd806e8a5738,fffffd807d8e88f8,fffffd807d8e8118,ffff800020d48000,0,0) at uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358 sys_mlock(ffff800020a99650,ffff800022d59118,ffff800022d59160) at sys_mlock+0x185 sys/uvm/uvm_mmap.c:765 syscall(ffff800022d591e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d591e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x30275e57510, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022d58940 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020d48000 rax 0xffff8000009f5880 r8 0xffffffff81b6af72 witness_checkorder+0xfe2 r9 0x5 r10 0x3 r11 0x958dea6f7ba98f10 r12 0xfffffd800297b100 r13 0 r14 0xffffffff825ed020 w_lodata+0x462b0 r15 0xffffffff825fbe00 w_lodata+0x55090 rip 0xffffffff819657f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d58930 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=29850 stat=onproc flags process=10 proc=4000000 pri=79, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020a98508,0xffffffff82659068 process=0xffff800020aece38 user=0xffff800022d54000, vmspace=0xfffffd806e8a5738 estcpu=36, cpticks=3, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 32842 246541 25113 32767 7 0x10 syz-executor.0 *32842 29850 25113 32767 7 0x4000010 syz-executor.0 4184 315921 62121 32767 3 0x90 nanosleep syz-executor.1 4184 453703 62121 32767 3 0x4000090 netcon2 syz-executor.1 4184 358257 62121 32767 3 0x4000090 fsleep syz-executor.1 62121 491951 47416 32767 3 0x90 nanosleep syz-executor.1 47416 506135 86417 0 3 0x82 wait syz-executor.1 25113 161747 86467 32767 3 0x90 nanosleep syz-executor.0 86467 359764 86417 0 3 0x82 wait syz-executor.0 34273 302734 0 0 3 0x14200 bored sosplice 86417 31451 46167 0 3 0x82 thrsleep syz-fuzzer 86417 263691 46167 0 3 0x4000082 thrsleep syz-fuzzer 86417 32232 46167 0 3 0x4000082 thrsleep syz-fuzzer 86417 119867 46167 0 3 0x4000082 thrsleep syz-fuzzer 86417 243613 46167 0 3 0x4000082 thrsleep syz-fuzzer 86417 278436 46167 0 3 0x4000082 thrsleep syz-fuzzer 86417 315022 46167 0 3 0x4000082 thrsleep syz-fuzzer 86417 93749 46167 0 3 0x4000082 thrsleep syz-fuzzer 86417 286836 46167 0 3 0x4000082 thrsleep syz-fuzzer 86417 327375 46167 0 3 0x4000082 kqread syz-fuzzer 46167 94374 80485 0 3 0x10008a pause ksh 80485 332633 36117 0 3 0x92 select sshd 26054 139699 1 0 3 0x100083 ttyin getty 36117 254372 1 0 3 0x80 select sshd 6179 48511 70789 73 3 0x100090 kqread syslogd 70789 121100 1 0 3 0x100082 netio syslogd 8413 298399 1 77 3 0x100090 poll dhclient 87166 260849 1 0 3 0x80 poll dhclient 16265 351771 0 0 3 0x14200 pgzero zerothread 77162 502672 0 0 3 0x14200 aiodoned aiodoned 74437 134757 0 0 3 0x14200 syncer update 51033 385675 0 0 3 0x14200 cleaner cleaner 3114 347380 0 0 3 0x14200 reaper reaper 15877 323687 0 0 3 0x14200 pgdaemon pagedaemon 89990 64650 0 0 3 0x14200 bored crynlk 75273 439636 0 0 3 0x14200 bored crypto 33532 372954 0 0 3 0x14200 bored viomb 59268 177708 0 0 3 0x40014200 acpi0 acpi0 21964 71261 0 0 3 0x40014200 idle1 82290 148263 0 0 3 0x14200 bored softnet 41170 55086 0 0 3 0x14200 bored systqmp 63383 358105 0 0 3 0x14200 bored systq 4464 353912 0 0 3 0x40014200 bored softclock 11924 253474 0 0 3 0x40014200 idle0 87413 394916 0 0 3 0x14200 bored smr 1 457316 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 32842 (syz-executor.0) thread 0xffff800020a99650 (29850) shared rwlock vmmaplk r = 0 (0xfffffd806e8a5750) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9494 6343K 6343K 78643K 10753 0 pcb 13 8K 8K 78643K 13 0 rtable 109 3K 3K 78643K 2027 0 ifaddr 39 10K 10K 78643K 338 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 2K 78643K 105 0 iov 0 0K 64K 78643K 424 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 76K 78643K 2239 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 187 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 1136 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 8 25K 33K 78643K 2173 0 sigio 0 0K 0K 78643K 68 0 proc 48 50K 70K 78643K 2379 0 subproc 34 2K 2K 78643K 748 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 1K 78643K 421 0 in_multi 33 2K 2K 78643K 549 0 ether_multi 1 0K 0K 78643K 5 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 938 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 152 33K 33K 78643K 8873 0 UVM aobj 130 4K 4K 78643K 135 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 159 0 NDP 5 0K 0K 78643K 135 0 temp 107 3036K 3117K 78643K 12664 0 kqueue 0 0K 0K 78643K 49 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 64 101 0 93 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1182 0 1180 1 0 1 1 0 8 0 rtentry 112 476 0 430 2 0 2 2 0 8 0 unpcb 120 3356 0 3343 6 4 2 2 0 8 1 syncache 264 30 0 30 11 11 0 1 0 8 0 tcpqe 32 280 0 280 8 8 0 1 0 8 0 tcpcb 544 1115 0 1108 11 10 1 3 0 8 0 ipq 40 509 0 508 1 0 1 1 0 8 0 ipqe 40 2189 0 2188 1 0 1 1 0 8 0 inpcb 280 3766 0 3751 14 11 3 4 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 88 0 84 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2047 0 1830 14 0 14 14 0 8 0 art_table 32 2048 0 1830 2 0 2 2 0 8 0 art_node 16 475 0 433 1 0 1 1 0 8 0 sysvmsgpl 40 44 0 32 1 0 1 1 0 8 0 semapl 112 1134 0 1124 1 0 1 1 0 8 0 shmpl 112 133 0 5 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3716 0 2305 46 0 46 46 0 8 0 ffsino 272 3716 0 2305 95 0 95 95 0 8 0 nchpl 144 6684 0 5077 60 0 60 60 0 8 0 uvmvnodes 72 4473 0 0 82 0 82 82 0 8 0 vnodes 208 4473 0 0 236 0 236 236 0 8 0 namei 1024 28365 0 28365 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 19916 0 19916 21 20 1 7 0 8 1 plimitpl 152 434 0 425 1 0 1 1 0 8 0 sigapl 432 2218 0 2202 4 2 2 3 0 8 0 futexpl 56 50524 0 50523 1 0 1 1 0 8 0 knotepl 112 1097 0 1077 4 3 1 2 0 8 0 kqueuepl 104 1030 0 1023 1 0 1 1 0 8 0 pipepl 160 2030 0 2011 5 3 2 2 0 8 1 fdescpl 488 2219 0 2202 3 0 3 3 0 8 0 filepl 152 23154 0 23037 25 18 7 9 0 8 2 lockfpl 104 1293 0 1292 1 0 1 1 0 8 0 lockfspl 48 355 0 354 1 0 1 1 0 8 0 sessionpl 112 59 0 49 1 0 1 1 0 8 0 pgrppl 48 77 0 67 1 0 1 1 0 8 0 ucredpl 96 4234 0 4225 1 0 1 1 0 8 0 zombiepl 144 2202 0 2202 1 0 1 1 0 8 1 processpl 904 2236 0 2202 5 1 4 5 0 8 0 procpl 632 6197 0 6151 5 0 5 5 0 8 1 srpgc 64 84 0 84 10 9 1 1 0 8 1 sosppl 128 61 0 61 11 11 0 1 0 8 0 sockpl 384 8355 0 8330 31 25 6 9 0 8 2 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 184 0 0 21 2 19 21 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 470 0 0 22 0 22 22 0 8 0 bufpl 280 11194 0 4128 505 0 505 505 0 8 0 anonpl 16 338558 0 323584 114 46 68 80 0 125 0 amapchunkpl 152 21198 0 20940 49 39 10 13 0 158 0 amappl16 192 11290 0 10393 130 73 57 59 0 8 10 amappl15 184 279 0 276 1 0 1 1 0 8 0 amappl14 176 761 0 759 1 0 1 1 0 8 0 amappl13 168 127 0 127 7 7 0 1 0 8 0 amappl12 160 86 0 82 2 1 1 1 0 8 0 amappl11 152 428 0 412 1 0 1 1 0 8 0 amappl10 144 302 0 297 2 1 1 1 0 8 0 amappl9 136 1482 0 1479 1 0 1 1 0 8 0 amappl8 128 838 0 779 2 0 2 2 0 8 0 amappl7 120 618 0 601 1 0 1 1 0 8 0 amappl6 112 355 0 340 1 0 1 1 0 8 0 amappl5 104 572 0 562 1 0 1 1 0 8 0 amappl4 96 2556 0 2523 1 0 1 1 0 8 0 amappl3 88 400 0 393 1 0 1 1 0 8 0 amappl2 80 13986 0 13906 3 1 2 3 0 8 0 amappl1 72 69548 0 69072 24 14 10 20 0 8 0 amappl 80 7163 0 7116 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 64 134 0 5 3 0 3 3 0 8 0 uaddrrnd 24 2219 0 2202 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2219 0 2202 1 0 1 1 0 8 0 vmmpekpl 168 24787 0 24758 2 0 2 2 0 8 0 vmmpepl 168 318823 0 316521 193 65 128 133 0 357 27 vmsppl 368 2218 0 2202 2 0 2 2 0 8 0 pdppl 4096 4445 0 4404 6 0 6 6 0 8 0 pvpl 32 876865 0 858025 252 86 166 192 0 265 4 pmappl 232 2218 0 2202 6 5 1 2 0 8 0 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 195 0 15 6 0 6 6 0 8 0