witness: lock order reversal: 1st 0xfffffd806f1ff060 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806e1f01a8 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(fffffd806e1f01a8,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806e1f01a8,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd806e1f0198,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd806e1f0198,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd807db5d390,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd807db5d390,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8065643330,8000000000000000,ffff8000232ccad8,ffff8000232ccaa8,0,0,8cf1b32426368d28,ffffffff810a2c20) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8065643330,8000000000000000,ffff8000232ccad8,ffff8000232ccaa8,0,0,8cf1b32426368d28,ffffffff810a2c20) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000232ccc40,ffff8000232ccc78,ffff8000232ccbc0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807effa5c0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000232ccdd0,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000232ccdd0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000232cd010) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000232cd010) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x154b2fc18e0, count: -15 ddb{0}> show registers rdi 0xffff800021ca0000 rsi 0x5e73 __ALIGN_SIZE+0x4e73 rbp 0xffff8000232cc750 rbx 0x3 rdx 0xffff800021ca0000 rcx 0x5e72 __ALIGN_SIZE+0x4e72 rax 0xffffffff81b70cf7 db_enter+0x17 r8 0xffffffff81e197dc witness_checkorder+0x10cc r9 0x5 r10 0xa066b4c42c047269 r11 0xe2152073dba9008 r12 0xfffffd8002dc2880 r13 0 r14 0 r15 0 rip 0xffffffff81b70cf8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000232cc740 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=65699 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=72, nice=20 forw=0xffffffffffffffff, list=0xffff800021270540,0xffff800021271a50 process=0xffff8000ffffa5b8 user=0xffff8000232c8000, vmspace=0xfffffd807effa5c0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87892 494798 82240 0 2 0 syz-executor.1 48940 462956 55981 0 7 0 syz-executor.0 *48940 65699 55981 0 7 0x4000000 syz-executor.0 55981 321076 91325 0 3 0x82 nanoslp syz-executor.0 66449 115863 1 0 3 0x100083 ttyin getty 82240 382354 91325 0 3 0x82 nanoslp syz-executor.1 41378 94625 0 0 3 0x14200 acct acct 62642 384924 0 0 3 0x14200 bored sosplice 91325 200749 94960 0 3 0x82 thrsleep syz-fuzzer 91325 300770 94960 0 3 0x4000082 thrsleep syz-fuzzer 91325 493365 94960 0 3 0x4000082 thrsleep syz-fuzzer 91325 416207 94960 0 3 0x4000082 thrsleep syz-fuzzer 91325 465077 94960 0 3 0x4000082 thrsleep syz-fuzzer 91325 123307 94960 0 3 0x4000082 thrsleep syz-fuzzer 91325 507249 94960 0 3 0x4000082 thrsleep syz-fuzzer 91325 439923 94960 0 3 0x4000082 kqread syz-fuzzer 94960 521978 64373 0 3 0x10008a sigsusp ksh 64373 275051 41513 0 3 0x9a select sshd 41513 267746 1 0 3 0x88 select sshd 49300 386432 95797 74 3 0x100092 bpf pflogd 95797 96725 1 0 3 0x80 netio pflogd 68770 239648 50193 73 3 0x100090 kqread syslogd 50193 53476 1 0 3 0x100082 netio syslogd 93833 254226 1 0 3 0x100080 kqread resolvd 51029 242101 40506 77 3 0x100092 kqread dhcpleased 97348 512619 40506 77 3 0x100092 kqread dhcpleased 40506 198100 1 0 3 0x80 kqread dhcpleased 5605 365196 0 0 3 0x14200 bored smr 57888 213591 0 0 2 0x14200 zerothread 64112 100944 0 0 3 0x14200 aiodoned aiodoned 30927 56376 0 0 3 0x14200 syncer update 2074 53593 0 0 3 0x14200 cleaner cleaner 39869 331821 0 0 3 0x14200 reaper reaper 2088 85718 0 0 3 0x14200 pgdaemon pagedaemon 79136 363055 0 0 3 0x14200 bored crynlk 6499 426456 0 0 3 0x14200 bored crypto 106 8739 0 0 3 0x14200 bored viomb 34713 129262 0 0 3 0x40014200 acpi0 acpi0 1025 271154 0 0 3 0x40014200 idle1 85716 418469 0 0 3 0x14200 bored softnet 27543 459119 0 0 3 0x14200 bored systqmp 49572 279340 0 0 3 0x14200 bored systq 84622 270666 0 0 3 0x40014200 bored softclock 41645 366831 0 0 3 0x40014200 idle0 1 184824 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 48940 (syz-executor.0) thread 0xffff8000212707e0 (65699) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829532c8) #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 (0xfffffd806f1ff060) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10190 6564K 7252K 78643K 16903 0 pcb 13 8K 8K 78643K 386 0 rtable 88 3K 4K 78643K 489 0 ifaddr 84 15K 15K 78643K 301 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 132 0 ioctlops 0 0K 4K 78643K 1665 0 iov 0 0K 32K 78643K 621 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1237 78K 78K 78643K 2918 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 25 0 VM map 2 1K 1K 78643K 2 0 sem 10 0K 1K 78643K 16 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 6 17K 25K 78643K 8509 0 sigio 0 0K 0K 78643K 25 0 proc 71 87K 111K 78643K 847 0 subproc 32 2K 2K 78643K 119 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 432 0 in_multi 29 1K 2K 78643K 277 0 ether_multi 1 0K 0K 78643K 79 0 mrt 1 0K 0K 78643K 44 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 671 0 pfkey data 0 0K 1K 78643K 6 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 293 199K 199K 78643K 103244 0 UVM aobj 18 4K 4K 78643K 18 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 302 0 NDP 16 0K 0K 78643K 75 0 temp 147 4215K 4310K 78643K 59179 0 kqueue 12 15K 22K 78643K 233 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 120 181 0 178 1 0 1 1 0 8 0 rtentry 112 122 0 90 2 0 2 2 0 8 0 unpcb 120 1231 0 1214 1 0 1 1 0 8 0 syncache 296 46 0 46 8 8 0 1 0 8 0 tcpqe 32 87 0 87 5 5 0 1 0 8 0 tcpcb 736 1010 0 1006 25 24 1 4 0 8 0 arp 120 17 0 11 1 0 1 1 0 8 0 inpcb 304 2469 0 2462 13 12 1 2 0 8 0 rttmr 72 15 0 15 2 2 0 1 0 8 0 nd6 48 23 0 18 1 0 1 1 0 8 0 pkpcb 40 34 0 34 7 7 0 1 0 8 0 kcovpl 48 7 0 5 1 0 1 1 0 8 0 ppxss 1248 13 0 13 4 4 0 1 0 8 0 pffrag 232 4 0 4 1 1 0 1 0 482 0 pffrnode 88 4 0 4 1 1 0 1 0 8 0 pffrent 40 16 0 16 1 1 0 1 0 8 0 pfosfp 40 1444 0 1010 5 0 5 5 0 8 0 pfosfpen 112 1444 0 714 21 0 21 21 0 8 0 pfstitem 24 23 0 21 1 0 1 1 0 8 0 pfstkey 112 23 0 21 1 0 1 1 0 8 0 pfstate 320 23 0 21 2 1 1 2 0 8 0 pfrule 1360 49 0 43 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 497 0 317 18 5 13 13 0 8 0 art_table 32 498 0 317 2 0 2 2 0 8 0 art_node 16 121 0 92 1 0 1 1 0 8 0 sysvmsgpl 40 45 0 5 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 15 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 11053 0 9644 89 0 89 89 0 8 0 ffsino 272 11053 0 9644 95 0 95 95 0 8 0 nchpl 144 20784 0 19175 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 48765 0 48765 2 1 1 1 0 8 1 percpumem 16 78 0 44 1 0 1 1 0 8 0 vcpupl 2048 13 0 0 2 0 2 2 0 8 0 vmpool 560 13 0 0 1 0 1 1 0 8 0 scxspl 216 62898 0 62898 16 15 1 8 0 8 1 plimitpl 152 161 0 152 1 0 1 1 0 8 0 sigapl 424 8747 0 8710 7 2 5 5 0 8 0 futexpl 56 54791 0 54791 2 1 1 1 0 8 1 knotepl 112 65 0 0 2 0 2 2 0 8 0 kqueuepl 216 5725 0 5714 3 2 1 2 0 8 0 pipepl 336 450 0 439 14 12 2 2 0 8 0 fdescpl 496 8729 0 8710 3 0 3 3 0 8 0 filepl 152 25290 0 25174 10 4 6 6 0 8 1 lockfpl 104 522 0 519 1 0 1 1 0 8 0 lockfspl 48 210 0 207 1 0 1 1 0 8 0 sessionpl 144 24 0 13 1 0 1 1 0 8 0 pgrppl 48 40 0 29 1 0 1 1 0 8 0 ucredpl 96 2024 0 2009 1 0 1 1 0 8 0 zombiepl 144 8710 0 8710 1 0 1 1 0 8 1 processpl 1072 8747 0 8710 3 0 3 3 0 8 0 procpl 672 18948 0 18903 10 5 5 5 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 57 0 57 7 7 0 1 0 8 0 sockpl 480 3946 0 3919 19 14 5 6 0 8 1 mcl64k 65536 34 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 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 21 0 0 3 0 3 3 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 480 0 0 33 0 33 33 0 8 0 mtagpl 96 222 0 0 4 0 4 4 0 8 0 mbufpl 256 870 0 0 42 0 42 42 0 8 0 bufpl 280 14758 0 8422 453 0 453 453 0 8 0 anonpl 24 2228277 0 2213931 146 56 90 106 0 186 0 amapchunkpl 152 245652 0 245068 35 10 25 25 0 158 1 amappl16 200 16185 0 15731 64 39 25 35 0 8 1 amappl15 192 1 0 1 1 1 0 1 0 8 0 amappl14 184 9 0 4 1 0 1 1 0 8 0 amappl13 176 2449 0 2448 1 0 1 1 0 8 0 amappl12 168 8 0 6 1 0 1 1 0 8 0 amappl11 160 2385 0 2368 1 0 1 1 0 8 0 amappl10 152 1448 0 1434 1 0 1 1 0 8 0 amappl9 144 1459 0 1456 1 0 1 1 0 8 0 amappl8 136 1711 0 1625 4 0 4 4 0 8 0 amappl7 128 1228 0 1213 1 0 1 1 0 8 0 amappl6 120 1313 0 1299 1 0 1 1 0 8 0 amappl5 112 10645 0 10622 1 0 1 1 0 8 0 amappl4 104 3120 0 3091 1 0 1 1 0 8 0 amappl3 96 361 0 357 1 0 1 1 0 8 0 amappl2 88 3050 0 2991 2 0 2 2 0 8 0 amappl1 80 149634 0 149188 13 3 10 13 0 8 0 amappl 88 102404 0 102231 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 17 0 0 1 0 1 1 0 8 0 uaddrrnd 24 8742 0 8710 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8742 0 8710 1 0 1 1 0 8 0 vmmpekpl 168 45666 0 45631 2 0 2 2 0 8 0 vmmpepl 168 983733 0 981792 151 63 88 101 0 357 1 vmsppl 368 8741 0 8710 4 1 3 3 0 8 0 rwobjpl 56 169243 0 167974 29 10 19 21 0 8 0 pdppl 4096 17492 0 17433 81 22 59 60 0 8 0 pvpl 32 5061272 0 5043632 279 122 157 172 0 265 10 pmappl 224 8741 0 8710 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 426 0 68 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(fffffd806e1f01a8,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806e1f01a8,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd806e1f0198,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd806e1f0198,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd807db5d390,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd807db5d390,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8065643330,8000000000000000,ffff8000232ccad8,ffff8000232ccaa8,0,0,8cf1b32426368d28,ffffffff810a2c20) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8065643330,8000000000000000,ffff8000232ccad8,ffff8000232ccaa8,0,0,8cf1b32426368d28,ffffffff810a2c20) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000232ccc40,ffff8000232ccc78,ffff8000232ccbc0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807effa5c0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000232ccdd0,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000232ccdd0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000232cd010) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000232cd010) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x154b2fc18e0, 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 __sanitizer_cov_trace_const_cmp4(0,0) at __sanitizer_cov_trace_const_cmp4+0x32 kd_curproc sys/dev/kcov.c:570 [inline] __sanitizer_cov_trace_const_cmp4(0,0) at __sanitizer_cov_trace_const_cmp4+0x32 trace_cmp sys/dev/kcov.c:165 [inline] __sanitizer_cov_trace_const_cmp4(0,0) at __sanitizer_cov_trace_const_cmp4+0x32 sys/dev/kcov.c:222 userret(ffff800021270540) at userret+0xdc sys/kern/kern_sig.c:1920 syscall(ffff800021295ef0) at syscall+0x4a1 mi_syscall_return sys/sys/syscall_mi.h:129 [inline] syscall(ffff800021295ef0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:609 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd2e50, count: -7