witness: lock order reversal: 1st 0xfffffd8066f35638 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd8065bdc1a8 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:398 witness_checkorder(fffffd8065bdc1a8,9,0) at witness_checkorder+0x108b rw_enter(fffffd8065bdc198,81) at rw_enter+0xd4 rrw_enter(fffffd8065bdc198,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80682345c0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80682345c0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8069d7b058,0,ffff8000256b5ee8,ffff8000256b5eb8,0,0) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8069d7b058,0,ffff8000256b5ee8,ffff8000256b5eb8,0,0) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000256b6050,ffff8000256b6088,ffff8000256b5fd0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807f00aa10,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000256b61e0,20000100) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262 kerntrap(ffff8000256b61e0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000256b6410) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000256b6410) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfd480464f50, count: -15 ddb{0}> show registers rdi 0xffff80002149f000 rsi 0xb005 __ALIGN_SIZE+0xa005 rbp 0xffff8000256b5b60 rbx 0x3 rdx 0xffff80002149f000 rcx 0xb004 __ALIGN_SIZE+0xa004 rax 0xffffffff818a1797 db_enter+0x17 r8 0xffffffff818fd781 witness_checkorder+0x1061 r9 0x5 r10 0x9af209bcbdadbc17 r11 0xc4313c7a47f9bfbc r12 0 r13 0xfffffd8065bdc1a8 r14 0 r15 0xfffffd8002cfa740 rip 0xffffffff818a1798 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000256b5b50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=303337 stat=onproc flags process=10 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff5a40,0xffffffff827e0b30 process=0xffff8000ffff1538 user=0xffff8000256b1000, vmspace=0xfffffd807f00aa10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 28527 5373 19669 32767 7 0x10 syz-executor.0 28527 395996 19669 32767 3 0x4000090 fsleep syz-executor.0 *28527 303337 19669 32767 7 0x4000010 syz-executor.0 63612 480421 84632 32767 3 0x90 nanoslp syz-executor.1 84632 128263 28753 0 3 0x82 wait syz-executor.1 19669 37853 80204 32767 3 0x90 nanoslp syz-executor.0 80204 104271 28753 0 3 0x82 wait syz-executor.0 91353 372840 0 0 3 0x14200 bored sosplice 28753 167208 26446 0 3 0x82 thrsleep syz-fuzzer 28753 456840 26446 0 3 0x4000082 thrsleep syz-fuzzer 28753 129105 26446 0 3 0x4000082 thrsleep syz-fuzzer 28753 149174 26446 0 3 0x4000082 thrsleep syz-fuzzer 28753 24412 26446 0 3 0x4000082 thrsleep syz-fuzzer 28753 34279 26446 0 3 0x4000082 thrsleep syz-fuzzer 28753 290432 26446 0 3 0x4000082 kqread syz-fuzzer 28753 388615 26446 0 3 0x4000082 thrsleep syz-fuzzer 26446 51625 46288 0 3 0x10008a sigsusp ksh 46288 127523 36483 0 3 0x92 select sshd 58275 497800 1 0 3 0x100083 ttyin getty 36483 36022 1 0 3 0x80 select sshd 86206 170746 10673 73 3 0x100090 kqread syslogd 10673 455084 1 0 3 0x100082 netio syslogd 88598 15255 1 77 3 0x100090 poll dhclient 69842 490660 1 0 3 0x80 poll dhclient 59359 313310 0 0 3 0x14200 bored smr 18723 173736 0 0 3 0x14200 pgzero zerothread 7481 121031 0 0 3 0x14200 aiodoned aiodoned 33979 66867 0 0 3 0x14200 syncer update 46675 101146 0 0 3 0x14200 cleaner cleaner 39654 475599 0 0 3 0x14200 reaper reaper 12552 231898 0 0 3 0x14200 pgdaemon pagedaemon 27285 230186 0 0 3 0x14200 bored crynlk 20235 291787 0 0 3 0x14200 bored crypto 53133 433641 0 0 3 0x14200 bored viomb 78000 336415 0 0 3 0x40014200 acpi0 acpi0 35911 367009 0 0 3 0x40014200 idle1 72527 304363 0 0 3 0x14200 bored softnet 89057 420663 0 0 3 0x14200 bored systqmp 19196 251709 0 0 3 0x14200 bored systq 70380 237563 0 0 3 0x40014200 bored softclock 19299 33609 0 0 3 0x40014200 idle0 1 429061 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 28527 (syz-executor.0) thread 0xffff8000ffff5ce0 (303337) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8290a510) #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+0x23a sys/uvm/uvm_fault.c:637 #2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262 #3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:316 #4 alltraps_kern_meltdown+0x7b #5 copyout+0x53 #6 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 #7 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd8066f35638) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 dopipe+0xe0 #2 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 #3 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10118 6414K 6414K 78643K 11214 0 pcb 13 8K 8K 78643K 13 0 rtable 111 3K 4K 78643K 438 0 ifaddr 39 10K 10K 78643K 53 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 48 0 ioctlops 0 0K 2K 78643K 112 0 iov 0 0K 24K 78643K 140 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1217 77K 77K 78643K 1405 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 23 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 3917 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 15400 0 sigio 0 0K 0K 78643K 41 0 proc 48 50K 83K 78643K 855 0 subproc 34 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 580 0 in_multi 33 2K 2K 78643K 203 0 ether_multi 1 0K 0K 78643K 23 0 mrt 1 0K 0K 78643K 2 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 727 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 306 44K 154K 78643K 185969 0 UVM aobj 61 2K 2K 78643K 81 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 194 0 NDP 5 0K 0K 78643K 15 0 temp 102 3985K 4049K 78643K 33105 0 kqueue 5 8K 14K 78643K 1514 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 20 0 0 1 0 1 1 0 8 0 rtpcb 120 210 0 208 1 0 1 1 0 8 0 rtentry 112 77 0 30 2 0 2 2 0 8 0 unpcb 120 1925 0 1909 1 0 1 1 0 8 0 syncache 296 49 0 49 9 9 0 1 0 8 0 tcpqe 32 778 0 778 11 11 0 1 0 8 0 tcpcb 736 1202 0 1198 13 12 1 6 0 8 0 arp 120 12 0 6 1 0 1 1 0 8 0 ipq 40 5 0 5 4 4 0 1 0 8 0 ipqe 40 10 0 10 4 4 0 1 0 8 0 inpcb 304 2576 0 2570 5 4 1 3 0 8 0 ip6q 72 2 0 2 2 2 0 1 0 8 0 nd6 48 20 0 11 1 0 1 1 0 8 0 kcovpl 48 4 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 349 0 139 17 3 14 15 0 8 0 art_table 32 350 0 139 2 0 2 2 0 8 0 art_node 16 76 0 33 1 0 1 1 0 8 0 sysvmsgpl 40 35 0 27 1 0 1 1 0 8 0 semupl 112 36 0 36 1 1 0 1 0 8 0 semapl 112 3896 0 3886 1 0 1 1 0 8 0 shmpl 112 78 0 20 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 21812 0 20410 88 0 88 88 0 8 0 ffsino 272 21812 0 20410 94 0 94 94 0 8 0 nchpl 144 45923 0 44331 60 0 60 60 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 96026 0 96026 3 2 1 1 0 8 1 percpumem 16 35 0 2 1 0 1 1 0 8 0 scxspl 216 114303 0 114303 12 11 1 8 0 8 1 plimitpl 152 144 0 135 1 0 1 1 0 8 0 sigapl 424 15582 0 15549 4 0 4 4 0 8 0 futexpl 56 145495 0 145494 2 1 1 1 0 8 0 knotepl 112 1607 0 1586 1 0 1 1 0 8 0 kqueuepl 168 28920 0 28911 2 0 2 2 0 8 1 pipepl 336 1472 0 1459 12 10 2 3 0 8 0 fdescpl 496 15565 0 15549 3 0 3 3 0 8 0 filepl 152 70050 0 69941 12 7 5 7 0 8 0 lockfpl 104 660 0 658 1 0 1 1 0 8 0 lockfspl 48 252 0 250 1 0 1 1 0 8 0 sessionpl 144 19 0 9 1 0 1 1 0 8 0 pgrppl 48 43 0 33 1 0 1 1 0 8 0 ucredpl 96 2748 0 2739 1 0 1 1 0 8 0 zombiepl 144 15549 0 15548 2 1 1 1 0 8 0 processpl 1080 15582 0 15548 5 2 3 3 0 8 0 procpl 672 33387 0 33344 4 0 4 4 0 8 0 sosppl 168 101 0 101 11 11 0 1 0 8 0 sockpl 480 4778 0 4754 19 15 4 7 0 8 0 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 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 15 0 0 2 0 2 2 0 8 0 mcl4k 4096 26 0 0 3 0 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 495 0 0 28 1 27 27 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1138 0 0 70 0 70 70 0 8 0 bufpl 280 28319 0 22055 448 0 448 448 0 8 0 anonpl 24 3956766 0 3936926 229 95 134 134 0 186 12 amapchunkpl 152 480186 0 479587 654 629 25 649 0 158 0 amappl16 200 26890 0 26142 101 54 47 47 0 8 7 amappl15 192 13036 0 13027 1 0 1 1 0 8 0 amappl14 184 15 0 9 2 1 1 1 0 8 0 amappl13 176 120 0 119 1 0 1 1 0 8 0 amappl12 168 2402 0 2393 1 0 1 1 0 8 0 amappl11 160 41 0 33 1 0 1 1 0 8 0 amappl10 152 30 0 23 1 0 1 1 0 8 0 amappl9 144 9 0 9 1 1 0 1 0 8 0 amappl8 136 551 0 427 5 0 5 5 0 8 0 amappl7 128 65 0 54 1 0 1 1 0 8 0 amappl6 120 108 0 90 1 0 1 1 0 8 0 amappl5 112 16070 0 16060 1 0 1 1 0 8 0 amappl4 104 3002 0 2969 1 0 1 1 0 8 0 amappl3 96 497 0 491 1 0 1 1 0 8 0 amappl2 88 566 0 520 2 0 2 2 0 8 0 amappl1 80 274638 0 274227 13 4 9 12 0 8 0 amappl 88 183186 0 183024 4 0 4 4 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 80 0 20 1 0 1 1 0 8 0 uaddrrnd 24 15565 0 15549 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 15565 0 15549 1 0 1 1 0 8 0 vmmpekpl 168 73888 0 73864 2 0 2 2 0 8 0 vmmpepl 168 1773681 0 1771481 176 69 107 117 0 357 6 vmsppl 368 15564 0 15549 2 0 2 2 0 8 0 rwobjpl 56 294951 0 293456 40 16 24 24 0 8 2 pdppl 4096 31137 0 31098 59 18 41 45 0 8 2 pvpl 32 8892092 0 8868803 342 131 211 211 0 265 19 pmappl 232 15564 0 15549 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 404 0 48 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:398 witness_checkorder(fffffd8065bdc1a8,9,0) at witness_checkorder+0x108b rw_enter(fffffd8065bdc198,81) at rw_enter+0xd4 rrw_enter(fffffd8065bdc198,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80682345c0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80682345c0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8069d7b058,0,ffff8000256b5ee8,ffff8000256b5eb8,0,0) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8069d7b058,0,ffff8000256b5ee8,ffff8000256b5eb8,0,0) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000256b6050,ffff8000256b6088,ffff8000256b5fd0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807f00aa10,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000256b61e0,20000100) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262 kerntrap(ffff8000256b61e0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000256b6410) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000256b6410) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfd480464f50, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 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: 0x7f7ffffca130, count: -3