witness: lock order reversal: 1st 0xfffffd807ea85df0 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd8061b53a38 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(fffffd8061b53a38,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8061b53a38,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd8061b53a28,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd8061b53a28,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8060a45a98,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8060a45a98,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd80607e63c0,0,ffff80002125cb68,ffff80002125cb38,0,2,863235461094b851,ffffffff8174c1b0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd80607e63c0,0,ffff80002125cb68,ffff80002125cb38,0,2,863235461094b851,ffffffff8174c1b0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff80002125ccd0,ffff80002125cd08,ffff80002125cc50,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807effb2e0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff80002125ce60,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002125ce60) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002125d090) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002125d090) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbf9dbe9030, count: -15 ddb{0}> show registers rdi 0xffff800021296000 rsi 0x62c5 __ALIGN_SIZE+0x52c5 rbp 0xffff80002125c7e0 rbx 0x3 rdx 0xffff800021296000 rcx 0x62c4 __ALIGN_SIZE+0x52c4 rax 0xffffffff81e7ee87 db_enter+0x17 r8 0xffffffff8120ae3c witness_checkorder+0x10cc r9 0x5 r10 0x5545b483d1b2817a r11 0xa15ec0a4e04f7b7c r12 0xfffffd8002dc1900 r13 0 r14 0 r15 0 rip 0xffffffff81e7ee88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002125c7d0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=307649 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002123f268,0xffffffff828f4910 process=0xffff8000ffff8868 user=0xffff800021258000, vmspace=0xfffffd807effb2e0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 66440 147142 32995 32767 7 0x10 syz-executor.0 *66440 307649 32995 32767 7 0x4000010 syz-executor.0 32995 225165 25800 32767 3 0x90 nanoslp syz-executor.0 25800 77897 15647 0 3 0x82 wait syz-executor.0 29996 29485 0 0 3 0x14200 bored sosplice 37956 423296 74111 32767 3 0x90 nanoslp syz-executor.1 74111 451257 15647 0 3 0x82 wait syz-executor.1 15647 223977 72596 0 3 0x82 thrsleep syz-fuzzer 15647 117191 72596 0 3 0x4000082 thrsleep syz-fuzzer 15647 227648 72596 0 3 0x4000082 thrsleep syz-fuzzer 15647 461158 72596 0 3 0x4000082 thrsleep syz-fuzzer 15647 2088 72596 0 3 0x4000082 kqread syz-fuzzer 15647 489835 72596 0 3 0x4000082 thrsleep syz-fuzzer 15647 282576 72596 0 3 0x4000082 thrsleep syz-fuzzer 15647 462047 72596 0 3 0x4000082 thrsleep syz-fuzzer 72596 109191 58562 0 3 0x10008a sigsusp ksh 58562 140560 96564 0 3 0x9a select sshd 39259 53146 1 0 3 0x100083 ttyin getty 96564 428497 1 0 3 0x88 select sshd 96531 127956 28482 73 3 0x100090 kqread syslogd 28482 413523 1 0 3 0x100082 netio syslogd 9750 307200 1 0 3 0x100080 kqread resolvd 64532 381709 57099 77 3 0x100092 kqread dhcpleased 52608 2613 57099 77 3 0x100092 kqread dhcpleased 57099 297754 1 0 3 0x80 kqread dhcpleased 71751 508557 0 0 3 0x14200 bored smr 34341 380449 0 0 3 0x14200 pgzero zerothread 91470 125250 0 0 3 0x14200 aiodoned aiodoned 89006 225580 0 0 3 0x14200 syncer update 96211 227148 0 0 3 0x14200 cleaner cleaner 76107 491058 0 0 3 0x14200 reaper reaper 22081 460272 0 0 3 0x14200 pgdaemon pagedaemon 89181 524081 0 0 3 0x14200 bored crynlk 11490 167534 0 0 3 0x14200 bored crypto 4845 129168 0 0 3 0x14200 bored viomb 89664 104065 0 0 3 0x40014200 acpi0 acpi0 71804 315320 0 0 3 0x40014200 idle1 79674 136215 0 0 3 0x14200 bored softnet 70817 125868 0 0 3 0x14200 bored systqmp 24586 522382 0 0 3 0x14200 bored systq 44409 275521 0 0 3 0x40014200 bored softclock 22013 253783 0 0 3 0x40014200 idle0 1 207029 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 66440 (syz-executor.0) thread 0xffff80002123ea88 (307649) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8284f930) #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 (0xfffffd807ea85df0) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10117 6407K 6433K 78643K 11210 0 pcb 13 8K 8K 78643K 13 0 rtable 108 3K 3K 78643K 276 0 ifaddr 39 10K 10K 78643K 46 0 counters 44 34K 34K 78643K 46 0 ioctlops 0 0K 2K 78643K 148 0 iov 0 0K 24K 78643K 390 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1216 76K 77K 78643K 1356 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 26 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 16 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 9507 0 sigio 0 0K 0K 78643K 42 0 proc 56 74K 99K 78643K 417 0 subproc 34 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 411 0 in_multi 33 2K 2K 78643K 149 0 ether_multi 1 0K 0K 78643K 25 0 mrt 1 0K 0K 78643K 1 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 971 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 371 60K 69K 78643K 118969 0 UVM aobj 85 4K 4K 78643K 110 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 177 0 NDP 5 0K 0K 78643K 12 0 temp 101 4209K 4274K 78643K 21468 0 kqueue 10 14K 18K 78643K 244 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 120 151 0 148 1 0 1 1 0 8 0 rtentry 112 58 0 13 2 0 2 2 0 8 0 unpcb 120 2395 0 2374 1 0 1 1 0 8 0 syncache 296 52 0 52 11 11 0 1 0 8 0 sackhl 24 4 0 4 2 2 0 1 0 8 0 tcpqe 32 454 0 454 11 11 0 2 0 8 0 tcpcb 736 1111 0 1107 12 11 1 5 0 8 0 arp 120 8 0 2 1 0 1 1 0 8 0 ipq 40 9 0 7 4 3 1 1 0 8 0 ipqe 40 228 0 226 4 3 1 1 0 8 0 inpcb 304 2201 0 2194 9 8 1 2 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 nd6 48 11 0 4 1 0 1 1 0 8 0 kcovpl 48 3 0 1 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 236 0 46 12 0 12 12 0 8 0 art_table 32 237 0 46 2 0 2 2 0 8 0 art_node 16 57 0 16 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 11 1 1 0 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 107 0 25 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11991 0 10582 89 0 89 89 0 8 0 ffsino 272 11991 0 10582 96 1 95 95 0 8 0 nchpl 144 24938 0 23337 61 1 60 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 56097 0 56097 3 2 1 1 0 8 1 percpumem 16 35 0 1 1 0 1 1 0 8 0 scxspl 216 67157 0 67157 10 9 1 8 0 8 1 plimitpl 152 141 0 131 1 0 1 1 0 8 0 sigapl 424 9728 0 9693 7 2 5 5 0 8 1 futexpl 56 124733 0 124733 2 1 1 1 0 8 1 knotepl 112 58 0 0 2 0 2 2 0 8 0 kqueuepl 216 14390 0 14374 9 7 2 2 0 8 1 pipepl 336 687 0 677 6 4 2 2 0 8 0 fdescpl 496 9711 0 9693 3 0 3 3 0 8 0 filepl 152 38996 0 38884 8 3 5 6 0 8 0 lockfpl 104 1218 0 1214 1 0 1 1 0 8 0 lockfspl 48 472 0 468 1 0 1 1 0 8 0 sessionpl 144 18 0 8 1 0 1 1 0 8 0 pgrppl 48 74 0 64 1 0 1 1 0 8 0 ucredpl 96 2200 0 2188 1 0 1 1 0 8 0 zombiepl 144 9693 0 9692 3 2 1 1 0 8 0 processpl 1072 9728 0 9692 3 0 3 3 0 8 0 procpl 672 22172 0 22128 13 9 4 5 0 8 0 sosppl 168 52 0 52 8 8 0 1 0 8 0 sockpl 480 4790 0 4759 10 5 5 6 0 8 0 mcl64k 65536 24 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 449 0 0 32 1 31 31 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1421 0 0 72 0 72 72 0 8 0 bufpl 280 14064 0 7743 452 0 452 452 0 8 0 anonpl 24 2526637 0 2496056 208 9 199 199 0 186 3 amapchunkpl 152 278083 0 276907 67 15 52 52 0 158 5 amappl16 200 16207 0 15254 59 8 51 53 0 8 0 amappl15 192 4865 0 4857 1 0 1 1 0 8 0 amappl14 184 3 0 2 1 0 1 1 0 8 0 amappl13 176 163 0 162 1 0 1 1 0 8 0 amappl12 168 14 0 11 1 0 1 1 0 8 0 amappl11 160 4760 0 4743 1 0 1 1 0 8 0 amappl10 152 9 0 6 1 0 1 1 0 8 0 amappl9 144 344 0 342 1 0 1 1 0 8 0 amappl8 136 503 0 399 4 0 4 4 0 8 0 amappl7 128 59 0 48 1 0 1 1 0 8 0 amappl6 120 59 0 48 1 0 1 1 0 8 0 amappl5 112 5137 0 5120 1 0 1 1 0 8 0 amappl4 104 10194 0 10162 1 0 1 1 0 8 0 amappl3 96 841 0 826 1 0 1 1 0 8 0 amappl2 88 641 0 600 2 1 1 2 0 8 0 amappl1 80 174049 0 173610 12 2 10 12 0 8 0 amappl 88 116183 0 115937 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 64 109 0 25 2 0 2 2 0 8 0 uaddrrnd 24 9711 0 9693 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9711 0 9693 1 0 1 1 0 8 0 vmmpekpl 168 58632 0 58607 2 0 2 2 0 8 0 vmmpepl 168 1119600 0 1117074 168 52 116 153 0 357 1 vmsppl 368 9710 0 9693 2 0 2 2 0 8 0 rwobjpl 56 191786 0 189980 29 3 26 27 0 8 0 pdppl 4096 19430 0 19386 67 21 46 50 0 8 2 pvpl 32 6206738 0 6172555 328 29 299 300 0 265 6 pmappl 224 9710 0 9693 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 411 0 43 11 0 11 11 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(fffffd8061b53a38,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd8061b53a38,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd8061b53a28,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd8061b53a28,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8060a45a98,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8060a45a98,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd80607e63c0,0,ffff80002125cb68,ffff80002125cb38,0,2,863235461094b851,ffffffff8174c1b0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd80607e63c0,0,ffff80002125cb68,ffff80002125cb38,0,2,863235461094b851,ffffffff8174c1b0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff80002125ccd0,ffff80002125cd08,ffff80002125cc50,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807effb2e0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff80002125ce60,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002125ce60) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002125d090) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002125d090) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbf9dbe9030, 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: 0x7f7fffff9240, count: -3