witness: lock order reversal: 1st 0xfffffd807f7d5248 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80747b0f88 inode (&ip->i_lock) lock order data w2 -> w1 missing lock order data w1 -> w2 missing 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:399 witness_checkorder(fffffd80747b0f88,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80747b0f88,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80747b0f78,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80747b0f78,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8069a29718,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8069a29718,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8065e7c5b8,0,ffff80002567af28,ffff80002567aef8,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8065e7c5b8,0,ffff80002567af28,ffff80002567aef8,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff80002567b090,ffff80002567b0c8,ffff80002567b010,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd800857e000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff80002567b220,20000000) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002567b220) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002567b450) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002567b450) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9c7a12f5490, count: -15 ddb{1}> show registers rdi 0xffff80002346a000 rsi 0x14717 acpi_pdirpa+0x57f rbp 0xffff80002567aba0 rbx 0x3 rdx 0xffff80002346a000 rcx 0x14716 acpi_pdirpa+0x57e rax 0xffffffff819d2487 db_enter+0x17 r8 0xffffffff81dbfa7c witness_checkorder+0x10cc r9 0x5 r10 0x90949730938dcc30 r11 0x6362269e3dfc0522 r12 0xfffffd8002da77c0 r13 0 r14 0 r15 0 rip 0xffffffff819d2488 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002567ab90 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=101766 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff8000212467e0,0xffff800021246010 process=0xffff8000ffff9d58 user=0xffff800025676000, vmspace=0xfffffd800857e000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27049 111659 59285 32767 7 0x10 syz-executor.0 27049 521105 59285 32767 3 0x4000090 fsleep syz-executor.0 64193 129477 99413 32767 2 0x10 syz-executor.1 *64193 101766 99413 32767 7 0x4000010 syz-executor.1 99413 197873 75291 32767 3 0x90 nanoslp syz-executor.1 75291 124264 9954 0 3 0x82 wait syz-executor.1 59285 487367 56830 32767 3 0x90 nanoslp syz-executor.0 56830 517356 9954 0 3 0x82 wait syz-executor.0 95984 236587 0 0 3 0x14200 bored sosplice 9954 141941 57274 0 3 0x82 thrsleep syz-fuzzer 9954 63455 57274 0 3 0x4000082 thrsleep syz-fuzzer 9954 50421 57274 0 3 0x4000082 thrsleep syz-fuzzer 9954 213528 57274 0 3 0x4000082 thrsleep syz-fuzzer 9954 349346 57274 0 3 0x4000082 kqread syz-fuzzer 9954 189042 57274 0 3 0x4000082 thrsleep syz-fuzzer 9954 89510 57274 0 3 0x4000082 thrsleep syz-fuzzer 9954 3810 57274 0 3 0x4000082 thrsleep syz-fuzzer 57274 404807 7632 0 3 0x10008a sigsusp ksh 7632 390277 49834 0 3 0x9a select sshd 6950 270046 1 0 3 0x100083 ttyin getty 49834 345147 1 0 3 0x88 select sshd 41740 308381 36523 73 3 0x100090 kqread syslogd 36523 64549 1 0 3 0x100082 netio syslogd 25002 339277 1 0 3 0x100080 kqread resolvd 44372 299255 89824 77 3 0x100092 kqread dhcpleased 25880 276492 89824 77 3 0x100092 kqread dhcpleased 89824 205671 1 0 3 0x80 kqread dhcpleased 75166 514068 0 0 3 0x14200 bored smr 58164 498879 0 0 2 0x14200 zerothread 86470 288523 0 0 3 0x14200 aiodoned aiodoned 68756 464007 0 0 3 0x14200 syncer update 22519 106943 0 0 3 0x14200 cleaner cleaner 85119 479613 0 0 3 0x14200 reaper reaper 94806 523597 0 0 3 0x14200 pgdaemon pagedaemon 99495 45247 0 0 3 0x14200 bored crynlk 53302 196893 0 0 3 0x14200 bored crypto 92526 281957 0 0 3 0x14200 bored viomb 89368 160986 0 0 3 0x40014200 acpi0 acpi0 72469 468713 0 0 3 0x40014200 idle1 45969 438417 0 0 3 0x14200 bored softnet 88954 523236 0 0 3 0x14200 bored systqmp 8185 210771 0 0 3 0x14200 bored systq 44659 98213 0 0 3 0x40014200 bored softclock 1069 469608 0 0 3 0x40014200 idle0 1 4795 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 27049 (syz-executor.0) thread 0xffff8000212467e0 (111659) shared rwlock vmmaplk r = 0 (0xfffffd800857e748) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:601 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 Process 64193 (syz-executor.1) thread 0xffff800021247500 (101766) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82835e98) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvm_fault+0x224 sys/uvm/uvm_fault.c:637 #2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 #3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #4 alltraps_kern_meltdown+0x7b #5 copyout+0x53 #6 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #7 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd807f7d5248) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 sys_socketpair+0x20f #2 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #3 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10118 6354K 6380K 78643K 11229 0 pcb 13 8K 8K 78643K 13 0 rtable 108 3K 4K 78643K 451 0 ifaddr 39 10K 10K 78643K 91 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 58 0 ioctlops 0 0K 2K 78643K 7825 0 iov 0 0K 12K 78643K 279 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1216 76K 77K 78643K 1478 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 20 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 7435 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 19629 0 sigio 0 0K 0K 78643K 173 0 proc 56 74K 99K 78643K 787 0 subproc 34 2K 2K 78643K 153 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 344 0 in_multi 33 2K 2K 78643K 269 0 ether_multi 1 0K 0K 78643K 19 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 2K 78643K 894 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 395 48K 48K 78643K 235844 0 UVM aobj 104 3K 3K 78643K 111 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 213 0 NDP 5 0K 0K 78643K 30 0 temp 102 4209K 4273K 78643K 42551 0 kqueue 10 14K 19K 78643K 251 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 plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 124 0 121 1 0 1 1 0 8 0 rtentry 112 129 0 84 2 0 2 2 0 8 0 unpcb 120 7313 0 7284 5 3 2 2 0 8 1 syncache 296 90 0 90 10 10 0 1 0 8 0 tcpqe 32 403 0 403 12 12 0 1 0 8 0 tcpcb 736 1243 0 1239 23 22 1 5 0 8 0 arp 120 21 0 15 1 0 1 1 0 8 0 ipq 40 17 0 17 3 3 0 1 0 8 0 ipqe 40 550 0 550 3 3 0 1 0 8 0 inpcb 304 2693 0 2686 6 5 1 3 0 8 0 ip6q 72 6 0 6 4 4 0 1 0 8 0 ip6af 40 11 0 11 4 4 0 1 0 8 0 nd6 48 33 0 26 1 0 1 1 0 8 0 kcovpl 48 9 0 7 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 551 0 355 15 2 13 14 0 8 0 art_table 32 552 0 355 2 0 2 2 0 8 0 art_node 16 128 0 87 1 0 1 1 0 8 0 sysvmsgpl 40 36 0 34 1 0 1 1 0 8 0 semupl 112 10 0 10 1 1 0 1 0 8 0 semapl 112 7423 0 7413 1 0 1 1 0 8 0 shmpl 112 108 0 7 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 22220 0 20805 91 2 89 89 0 8 0 ffsino 272 22220 0 20805 96 1 95 95 0 8 0 nchpl 144 44704 0 43102 61 0 61 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 100415 0 100415 1 0 1 1 0 8 1 percpumem 16 41 0 7 1 0 1 1 0 8 0 scxspl 216 130071 0 130071 12 11 1 6 0 8 1 plimitpl 152 262 0 252 1 0 1 1 0 8 0 sigapl 424 19831 0 19795 6 1 5 5 0 8 1 futexpl 56 208015 0 208014 1 0 1 1 0 8 0 knotepl 112 71 0 0 2 0 2 2 0 8 0 kqueuepl 216 39288 0 39269 13 11 2 2 0 8 0 pipepl 336 883 0 873 8 6 2 2 0 8 0 fdescpl 496 19814 0 19795 3 0 3 3 0 8 0 filepl 152 79901 0 79780 14 8 6 7 0 8 1 lockfpl 104 1066 0 1064 1 0 1 1 0 8 0 lockfspl 48 426 0 424 1 0 1 1 0 8 0 sessionpl 144 24 0 14 1 0 1 1 0 8 0 pgrppl 48 37 0 27 1 0 1 1 0 8 0 ucredpl 96 2827 0 2815 1 0 1 1 0 8 0 zombiepl 144 19795 0 19795 1 0 1 1 0 8 1 processpl 1072 19831 0 19795 3 0 3 3 0 8 0 procpl 672 42139 0 42094 16 12 4 5 0 8 0 sosppl 168 102 0 102 8 8 0 1 0 8 0 sockpl 480 10206 0 10167 22 15 7 9 0 8 2 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 3 0 3 3 0 8 0 mcl12k 12288 31 0 0 2 0 2 2 0 8 0 mcl9k 9216 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 34 0 0 4 1 3 3 0 8 0 mcl4k 4096 41 0 0 6 1 5 6 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 500 0 0 28 0 28 28 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1118 0 0 56 0 56 56 0 8 0 bufpl 280 33390 0 27058 453 0 453 453 0 8 0 anonpl 24 5049727 0 5024991 250 100 150 151 0 186 0 amapchunkpl 152 553934 0 553171 51 21 30 30 0 158 0 amappl16 200 32607 0 31700 117 69 48 54 0 8 0 amappl15 192 2596 0 2594 1 0 1 1 0 8 0 amappl14 184 6234 0 6231 1 0 1 1 0 8 0 amappl13 176 152 0 149 1 0 1 1 0 8 0 amappl12 168 8 0 5 1 0 1 1 0 8 0 amappl11 160 39 0 28 1 0 1 1 0 8 0 amappl10 152 1443 0 1438 1 0 1 1 0 8 0 amappl9 144 9325 0 9320 1 0 1 1 0 8 0 amappl8 136 766 0 612 6 0 6 6 0 8 0 amappl7 128 98 0 84 1 0 1 1 0 8 0 amappl6 120 9485 0 9467 1 0 1 1 0 8 0 amappl5 112 21622 0 21603 1 0 1 1 0 8 0 amappl4 104 918 0 889 1 0 1 1 0 8 0 amappl3 96 673 0 671 1 0 1 1 0 8 0 amappl2 88 874 0 817 2 0 2 2 0 8 0 amappl1 80 342265 0 341817 12 2 10 12 0 8 0 amappl 88 232486 0 232287 5 0 5 5 0 92 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 64 110 0 7 2 0 2 2 0 8 0 uaddrrnd 24 19814 0 19795 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 19814 0 19795 1 0 1 1 0 8 0 vmmpekpl 168 85153 0 85131 2 0 2 2 0 8 0 vmmpepl 168 2263119 0 2260542 185 72 113 139 0 357 0 vmsppl 368 19813 0 19795 2 0 2 2 0 8 0 rwobjpl 56 376759 0 374989 49 23 26 27 0 8 1 pdppl 4096 39636 0 39590 72 26 46 50 0 8 0 pvpl 32 12395650 0 12367083 411 176 235 235 0 265 4 pmappl 224 19813 0 19795 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 415 0 63 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82787ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:353 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82835c90) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82835c90) at __mp_lock+0x129 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff82835c90) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82835c90) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd800857e730,60d5cd40000,0,1) at uvm_fault+0x192 sys/uvm/uvm_fault.c:623 upageflttrap(ffff800025675960,60d5cd40000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800025675960) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff5d30, count: -11 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 witness_checkorder(fffffd80747b0f88,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80747b0f88,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80747b0f78,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80747b0f78,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8069a29718,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8069a29718,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8065e7c5b8,0,ffff80002567af28,ffff80002567aef8,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8065e7c5b8,0,ffff80002567af28,ffff80002567aef8,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff80002567b090,ffff80002567b0c8,ffff80002567b010,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd800857e000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff80002567b220,20000000) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002567b220) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002567b450) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002567b450) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9c7a12f5490, count: -15