witness: lock order reversal: 1st 0xfffffd806f14bc00 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd8062b314e0 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{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:440 witness_checkorder(fffffd8062b314e0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8062b314e0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd8062b314d0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd8062b314d0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806282a478,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806282a478,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8060954498,0,ffff8000244c8aa8,ffff8000244c8a78,0,0,836be2eba8e03d3,ffffffff81730450) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8060954498,0,ffff8000244c8aa8,ffff8000244c8a78,0,0,836be2eba8e03d3,ffffffff81730450) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000244c8c10,ffff8000244c8c48,ffff8000244c8b90,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd806f19dcf8,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000244c8da0,20000640) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000244c8da0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000244c8fe0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000244c8fe0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa71f4b025e0, count: -15 ddb{0}> show registers rdi 0xffff8000234ae000 rsi 0x70c1 __ALIGN_SIZE+0x60c1 rbp 0xffff8000244c8720 rbx 0x3 rdx 0xffff8000234ae000 rcx 0x70c0 __ALIGN_SIZE+0x60c0 rax 0xffffffff811ae447 db_enter+0x17 r8 0xffffffff8201797c witness_checkorder+0x10cc r9 0x5 r10 0xc05cafe2fd5cc2b6 r11 0xc8da8e6ff34f0e97 r12 0xfffffd8002db5880 r13 0 r14 0 r15 0 rip 0xffffffff811ae448 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000244c8710 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=107961 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800021216000,0xffffffff828d35a0 process=0xffff8000ffffa9e8 user=0xffff8000244c4000, vmspace=0xfffffd806f19dcf8 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 45644 54699 79205 0 7 0 syz-executor.1 *45644 107961 79205 0 7 0x4000000 syz-executor.1 79205 199525 63243 0 3 0x82 nanoslp syz-executor.1 98858 157540 63243 0 3 0x2 biowait syz-executor.0 63243 185400 63225 0 3 0x82 thrsleep syz-fuzzer 63243 215060 63225 0 3 0x4000082 nanoslp syz-fuzzer 63243 142586 63225 0 3 0x4000082 thrsleep syz-fuzzer 63243 206735 63225 0 3 0x4000082 kqread syz-fuzzer 63243 321222 63225 0 3 0x4000082 thrsleep syz-fuzzer 63243 151467 63225 0 3 0x4000082 thrsleep syz-fuzzer 63243 55119 63225 0 3 0x4000082 thrsleep syz-fuzzer 63243 35929 63225 0 3 0x4000082 thrsleep syz-fuzzer 63225 344740 66786 0 3 0x10008a sigsusp ksh 66786 442700 8339 0 3 0x9a select sshd 88657 54838 1 0 3 0x100083 ttyin getty 8339 488462 1 0 3 0x88 select sshd 87367 134092 36729 74 3 0x100092 bpf pflogd 36729 109170 1 0 3 0x80 netio pflogd 67113 382959 60353 73 3 0x100090 kqread syslogd 60353 504391 1 0 3 0x100082 netio syslogd 12544 85891 1 0 3 0x100080 kqread resolvd 66399 507743 41473 77 3 0x100092 kqread dhcpleased 44921 369250 41473 77 3 0x100092 kqread dhcpleased 41473 514397 1 0 3 0x80 kqread dhcpleased 80763 313674 0 0 3 0x14200 bored smr 32469 374507 0 0 3 0x14200 pgzero zerothread 33758 267537 0 0 3 0x14200 aiodoned aiodoned 66993 222490 0 0 3 0x14200 syncer update 58942 90488 0 0 3 0x14200 cleaner cleaner 82770 265802 0 0 3 0x14200 reaper reaper 9480 405631 0 0 3 0x14200 pgdaemon pagedaemon 76161 92804 0 0 3 0x14200 bored crynlk 19289 60893 0 0 3 0x14200 bored crypto 81141 343269 0 0 3 0x14200 bored viomb 8309 176128 0 0 3 0x40014200 acpi0 acpi0 71588 296251 0 0 3 0x40014200 idle1 7230 75999 0 0 3 0x14200 bored softnet 44046 505919 0 0 3 0x14200 bored systqmp 66851 236126 0 0 3 0x14200 bored systq 46930 245701 0 0 3 0x40014200 bored softclock 42587 192892 0 0 3 0x40014200 idle0 1 410185 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 45644 (syz-executor.1) thread 0xffff800021217a40 (107961) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828c40d0) #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 (0xfffffd806f14bc00) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 dopipe+0xd6 #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 Process 98858 (syz-executor.0) thread 0xffff800021216540 (157540) exclusive rrwlock inode r = 0 (0xfffffd8062b31d60) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1eb sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1321 #8 ufs_lookup+0x145f sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:88 #10 vfs_lookup+0x737 sys/kern/vfs_lookup.c:561 #11 namei+0x55a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1854 #13 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b0153c8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xdd sys/kern/vfs_lookup.c:413 #6 namei+0x55a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1854 #8 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10121 6474K 6608K 78643K 11849 0 pcb 13 8K 8K 78643K 19 0 rtable 106 3K 3K 78643K 172 0 ifaddr 44 10K 10K 78643K 45 0 counters 44 34K 34K 78643K 44 0 ioctlops 0 0K 4K 78643K 1481 0 iov 0 0K 0K 78643K 6 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1226 77K 77K 78643K 1513 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 11 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 67644 0 proc 69 87K 99K 78643K 336 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 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 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 404 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 352 43K 43K 78643K 789038 0 UVM aobj 20 2K 2K 78643K 20 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 10 0 temp 65 4199K 4263K 78643K 137900 0 kqueue 10 14K 18K 78643K 35 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 plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 21 0 18 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 291 0 276 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 271 0 271 2 2 0 2 0 8 0 tcpcb 736 22 0 18 1 0 1 1 0 8 0 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 76 0 69 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 13 0 10 1 0 1 1 0 8 0 pfstkey 112 13 0 10 1 0 1 1 0 8 0 pfstate 320 13 0 10 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 256 189 0 0 12 0 12 12 0 8 0 art_table 32 190 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 17 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 69070 0 67658 89 0 89 89 0 8 0 ffsino 272 69070 0 67658 95 0 95 95 0 8 0 nchpl 144 136975 0 135354 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 276052 0 276052 2 1 1 1 0 8 1 percpumem 16 34 0 0 1 0 1 1 0 8 0 scxspl 216 411417 0 411414 9 8 1 8 0 8 0 plimitpl 152 19 0 10 1 0 1 1 0 8 0 sigapl 424 67894 0 67860 5 1 4 5 0 8 0 futexpl 56 260429 0 260429 1 0 1 1 0 8 1 knotepl 112 64 0 0 2 0 2 2 0 8 0 kqueuepl 216 64463 0 64457 1 0 1 1 0 8 0 pipepl 336 105 0 94 3 1 2 2 0 8 1 fdescpl 496 67878 0 67860 3 0 3 3 0 8 0 filepl 152 134845 0 134728 7 2 5 6 0 8 0 lockfpl 104 387 0 383 1 0 1 1 0 8 0 lockfspl 48 186 0 183 1 0 1 1 0 8 0 sessionpl 144 18 0 7 1 0 1 1 0 8 0 pgrppl 48 61 0 50 1 0 1 1 0 8 0 ucredpl 96 124 0 112 1 0 1 1 0 8 0 zombiepl 144 67860 0 67860 2 1 1 1 0 8 1 processpl 1072 67894 0 67860 3 0 3 3 0 8 0 procpl 672 137147 0 137105 5 1 4 5 0 8 0 sockpl 480 392 0 367 6 2 4 5 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 26 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 26 0 0 3 0 3 3 0 8 0 mcl2k2 2112 14 0 0 1 0 1 1 0 8 0 mcl2k 2048 398 0 0 39 17 22 39 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 918 0 0 23 2 21 23 0 8 0 bufpl 280 71070 0 64734 453 0 453 453 0 8 0 anonpl 24 16528747 0 16492418 236 2 234 234 0 186 0 amapchunkpl 152 1862304 0 1861122 56 8 48 49 0 158 0 amappl16 200 90341 0 89017 71 1 70 71 0 8 0 amappl15 192 1 0 0 1 0 1 1 0 8 0 amappl14 184 2 0 1 1 0 1 1 0 8 0 amappl13 176 29 0 28 1 0 1 1 0 8 0 amappl12 168 33733 0 33729 1 0 1 1 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 49 0 42 1 0 1 1 0 8 0 amappl9 144 34152 0 34146 1 0 1 1 0 8 0 amappl8 136 472 0 391 3 0 3 3 0 8 0 amappl7 128 75 0 61 1 0 1 1 0 8 0 amappl6 120 34024 0 34009 1 0 1 1 0 8 0 amappl5 112 67773 0 67754 1 0 1 1 0 8 0 amappl4 104 583 0 556 1 0 1 1 0 8 0 amappl3 96 34540 0 34536 1 0 1 1 0 8 0 amappl2 88 996 0 942 2 0 2 2 0 8 0 amappl1 80 1108556 0 1108109 15 5 10 13 0 8 0 amappl 88 788132 0 787884 6 0 6 6 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 19 0 0 1 0 1 1 0 8 0 uaddrrnd 24 67878 0 67860 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 67878 0 67860 1 0 1 1 0 8 0 vmmpekpl 168 250927 0 250896 3 1 2 2 0 8 0 vmmpepl 168 7552829 0 7550018 195 67 128 172 0 357 0 vmsppl 368 67877 0 67860 2 0 2 2 0 8 0 rwobjpl 56 1214691 0 1212470 34 2 32 32 0 8 0 pdppl 4096 135764 0 135720 72 26 46 50 0 8 2 pvpl 32 31333912 0 31293980 354 14 340 349 0 265 0 pmappl 224 67877 0 67860 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 355 0 50 10 0 10 10 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd8062b314e0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8062b314e0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd8062b314d0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd8062b314d0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806282a478,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806282a478,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8060954498,0,ffff8000244c8aa8,ffff8000244c8a78,0,0,836be2eba8e03d3,ffffffff81730450) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8060954498,0,ffff8000244c8aa8,ffff8000244c8a78,0,0,836be2eba8e03d3,ffffffff81730450) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000244c8c10,ffff8000244c8c48,ffff8000244c8b90,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd806f19dcf8,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000244c8da0,20000640) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000244c8da0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000244c8fe0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000244c8fe0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa71f4b025e0, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0x7f7fffff1e20, count: -3