witness: lock order reversal: 1st 0xffffffff827728c0 netlock (netlock) 2nd 0xfffffd807a1436f8 inode (&ip->i_lock) lock order "&ip->i_lock"(rrwlock) -> "netlock"(rwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter_write+0x5b sys/kern/kern_rwlock.c:127 #2 uvn_get+0xeb uvm_vnode_lock sys/uvm/uvm_vnode.c:1501 [inline] #2 uvn_get+0xeb sys/uvm/uvm_vnode.c:993 #3 uvm_fault+0xa41 sys/uvm/uvm_fault.c:1073 #4 kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 #6 alltraps_kern_meltdown+0x7b #7 copyin+0x53 #8 sys_connect+0x9b sys/kern/uipc_syscalls.c:362 #9 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #10 Xsyscall+0x128 lock order "netlock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter+0xd4 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 #4 vn_lock+0x6c sys/kern/vfs_vnops.c:575 #5 vget+0x1c6 sys/kern/vfs_subr.c:671 #6 ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 #7 ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] #7 ktrstruct+0x169 sys/kern/kern_ktrace.c:311 #8 sys_connect+0x246 #9 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #10 Xsyscall+0x128 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:398 witness_checkorder(fffffd807a1436f8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd807a1436f8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd807a1436e8,1) at rw_enter+0xd4 rrw_enter(fffffd807a1436e8,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd8068c2e410,2001) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd8068c2e410,2001) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 vget(fffffd8068c2e410,2001) at vget+0x1c6 sys/kern/vfs_subr.c:671 ktrwriteraw(ffff800021273728,fffffd8068c2e410,fffffd807f7b7840,ffff80002129d800,ffff80002129d7e0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021273728,ffffffff823b392d,fffffd80668cfd20,a) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021273728,ffffffff823b392d,fffffd80668cfd20,a) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_connect(ffff800021273728,ffff80002129d948,ffff80002129d990) at sys_connect+0x246 syscall(ffff80002129da10) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002129da10) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d63580a6f0, count: -12 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff80002129d410 rbx 0x3 rdx 0xffff800000b54ac0 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff823582d3 witness_checkorder+0xf33 r9 0x5 r10 0xc52749d784d80b85 r11 0xc48068e4f4e271f3 r12 0xffffffff828b8960 w_lodata+0x47750 r13 0 r14 0xffffffff828b6e90 w_lodata+0x45c80 r15 0xfffffd8002ce5500 rip 0xffffffff81f33568 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002129d400 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=505322 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff800021272538,0xffffffff828de248 process=0xffff800021236110 user=0xffff800021298000, vmspace=0xfffffd807effa5c0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38059 413295 42246 0 7 0x1 syz-executor.0 *38059 505322 42246 0 7 0x4000001 syz-executor.0 49042 184791 63695 0 3 0x82 nanosleep syz-executor.1 42246 202667 63695 0 3 0x82 nanosleep syz-executor.0 61347 386992 0 0 3 0x14200 bored sosplice 63695 349127 59741 0 3 0x82 thrsleep syz-fuzzer 63695 272119 59741 0 3 0x4000082 nanosleep syz-fuzzer 63695 229730 59741 0 3 0x4000082 nanosleep syz-fuzzer 63695 477042 59741 0 3 0x4000082 thrsleep syz-fuzzer 63695 385771 59741 0 3 0x4000082 thrsleep syz-fuzzer 63695 12721 59741 0 3 0x4000082 thrsleep syz-fuzzer 63695 293857 59741 0 3 0x4000082 thrsleep syz-fuzzer 63695 8340 59741 0 3 0x4000082 kqread syz-fuzzer 59741 392387 58459 0 3 0x10008a pause ksh 58459 521841 57455 0 3 0x92 select sshd 13161 506321 1 0 3 0x100083 ttyin getty 57455 508400 1 0 3 0x80 select sshd 57805 353467 80710 74 3 0x100092 bpf pflogd 80710 297958 1 0 3 0x80 netio pflogd 72138 456801 43504 73 3 0x100090 kqread syslogd 43504 66152 1 0 3 0x100082 netio syslogd 98980 394092 1 77 3 0x100090 poll dhclient 53716 336173 1 0 3 0x80 poll dhclient 67329 58176 0 0 3 0x14200 bored smr 59633 375016 0 0 3 0x14200 pgzero zerothread 66674 215586 0 0 3 0x14200 aiodoned aiodoned 90649 133878 0 0 3 0x14200 syncer update 12022 510945 0 0 3 0x14200 cleaner cleaner 55697 70577 0 0 3 0x14200 reaper reaper 88653 15874 0 0 3 0x14200 pgdaemon pagedaemon 90301 46132 0 0 3 0x14200 bored crynlk 65848 137618 0 0 3 0x14200 bored crypto 27489 286292 0 0 3 0x14200 bored viomb 50030 409058 0 0 3 0x40014200 acpi0 acpi0 81160 352714 0 0 3 0x40014200 idle1 54863 308272 0 0 3 0x14200 bored softnet 9116 36937 0 0 3 0x14200 bored systqmp 13269 189966 0 0 3 0x14200 bored systq 44700 116411 0 0 3 0x40014200 bored softclock 34169 250923 0 0 3 0x40014200 idle0 1 75602 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 38059 (syz-executor.0) thread 0xffff800021273728 (505322) exclusive rwlock netlock r = 0 (0xffffffff827728c0) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sys_connect+0x6a sys/kern/uipc_syscalls.c:357 #3 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #4 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828db810) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3fd sys/arch/amd64/amd64/trap.c:590 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9528 6437K 7968K 78643K 14061 0 pcb 13 8K 8K 78643K 173 0 rtable 105 3K 3K 78643K 596 0 ifaddr 69 13K 13K 78643K 156 0 counters 43 33K 34K 78643K 71 0 ioctlops 0 0K 4K 78643K 1580 0 iov 0 0K 16K 78643K 83 0 mount 1 1K 1K 78643K 1 0 vnodes 1222 77K 77K 78643K 2256 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 13 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 208 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1825 197K 290K 78643K 13109 0 file desc 5 13K 25K 78643K 2876 0 sigio 0 0K 0K 78643K 7 0 proc 62 63K 95K 78643K 606 0 subproc 32 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 140 0 in_multi 33 2K 2K 78643K 266 0 ether_multi 1 0K 0K 78643K 71 0 mrt 0 0K 0K 78643K 84 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 440 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 157 92K 92K 78643K 7373 0 UVM aobj 15 7K 7K 78643K 15 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 165 0 NDP 14 0K 0K 78643K 44 0 temp 130 3966K 4034K 78643K 27763 0 kqueue 3 4K 12K 78643K 104 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 arp 64 10 0 4 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 120 102 0 100 1 0 1 1 0 8 0 rtentry 112 110 0 66 2 0 2 2 0 8 0 unpcb 120 680 0 657 2 1 1 2 0 8 0 syncache 296 16 0 16 3 3 0 1 0 8 0 tcpqe 32 30 0 30 3 3 0 1 0 8 0 tcpcb 736 439 0 434 6 4 2 5 0 8 0 inpcb 296 1243 0 1234 3 1 2 2 0 8 0 rttmr 72 32 0 32 2 2 0 1 0 8 0 nd6 48 23 0 17 1 0 1 1 0 8 0 kcovpl 48 4 0 2 1 0 1 1 0 8 0 pffrag 232 3 0 2 1 0 1 1 0 482 0 pffrnode 88 3 0 2 1 0 1 1 0 8 0 pffrent 40 5 0 4 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 56 0 40 1 0 1 1 0 8 0 pfstkey 112 56 0 40 1 0 1 1 0 8 0 pfstate 328 56 0 40 3 0 3 3 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 256 309 0 118 14 0 14 14 0 8 2 art_table 32 310 0 118 2 0 2 2 0 8 0 art_node 16 109 0 69 1 0 1 1 0 8 0 sysvmsgpl 40 47 0 23 1 0 1 1 0 8 0 semapl 112 196 0 186 1 0 1 1 0 8 0 shmpl 112 12 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 4830 0 3426 90 1 89 89 0 8 1 ffsino 272 4830 0 3426 95 0 95 95 0 8 1 nchpl 144 8246 0 6652 60 0 60 60 0 8 0 uvmvnodes 72 5708 0 0 104 0 104 104 0 8 0 vnodes 208 5708 0 0 301 0 301 301 0 8 0 namei 1024 20780 0 20780 1 0 1 1 0 8 1 percpumem 16 46 0 14 1 0 1 1 0 8 0 vcpupl 1984 5 0 0 1 0 1 1 0 8 0 vmpool 560 9 0 4 2 1 1 1 0 8 0 scxspl 216 24675 0 24675 11 10 1 8 0 8 1 plimitpl 152 197 0 189 1 0 1 1 0 8 0 sigapl 424 3087 0 3054 4 0 4 4 0 8 0 futexpl 56 19134 0 19134 1 0 1 1 0 8 1 knotepl 112 198 0 178 1 0 1 1 0 8 0 kqueuepl 152 1228 0 1226 1 0 1 1 0 8 0 pipepl 304 191 0 180 8 6 2 2 0 8 1 fdescpl 496 3070 0 3054 3 0 3 3 0 8 0 filepl 152 10360 0 10257 6 1 5 6 0 8 1 lockfpl 104 397 0 396 1 0 1 1 0 8 0 lockfspl 48 157 0 156 1 0 1 1 0 8 0 sessionpl 144 20 0 9 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 1304 0 1295 1 0 1 1 0 8 0 zombiepl 144 3054 0 3053 1 0 1 1 0 8 0 processpl 1056 3087 0 3053 3 0 3 3 0 8 0 procpl 656 6611 0 6569 4 0 4 4 0 8 0 sosppl 168 26 0 26 3 3 0 1 0 8 0 sockpl 400 2025 0 1991 6 2 4 5 0 8 0 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 13 0 0 2 0 2 2 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 10 0 0 2 0 2 2 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k 2048 227 0 0 28 0 28 28 0 8 0 mtagpl 96 209 0 0 6 0 6 6 0 8 0 mbufpl 256 641 0 0 37 0 37 37 0 8 0 bufpl 280 7341 0 1092 447 0 447 447 0 8 0 anonpl 16 214368 0 201935 63 2 61 61 0 124 0 amapchunkpl 152 11389 0 11059 15 0 15 15 0 158 0 amappl16 192 9147 0 8551 33 2 31 31 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 22 0 18 1 0 1 1 0 8 0 amappl13 168 1081 0 1078 1 0 1 1 0 8 0 amappl12 160 14 0 10 1 0 1 1 0 8 0 amappl11 152 63 0 47 1 0 1 1 0 8 0 amappl10 144 1800 0 1795 1 0 1 1 0 8 0 amappl9 136 373 0 372 1 0 1 1 0 8 0 amappl8 128 172 0 126 2 0 2 2 0 8 0 amappl7 120 274 0 265 1 0 1 1 0 8 0 amappl6 112 1874 0 1859 1 0 1 1 0 8 0 amappl5 104 3198 0 3180 1 0 1 1 0 8 0 amappl4 96 290 0 265 1 0 1 1 0 8 0 amappl3 88 1227 0 1215 1 0 1 1 0 8 0 amappl2 80 20764 0 20698 2 0 2 2 0 8 0 amappl1 72 95425 0 94946 24 14 10 19 0 8 0 amappl 80 6942 0 6853 2 0 2 2 0 84 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 14 0 0 1 0 1 1 0 8 0 uaddrrnd 24 3079 0 3058 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3079 0 3058 1 0 1 1 0 8 0 vmmpekpl 168 19633 0 19603 2 0 2 2 0 8 0 vmmpepl 168 387410 0 385562 132 28 104 104 0 357 17 vmsppl 368 3078 0 3058 2 0 2 2 0 8 0 pdppl 4096 6165 0 6121 63 17 46 46 0 8 2 pvpl 32 953346 0 937815 175 23 152 153 0 265 6 pmappl 232 3078 0 3058 4 2 2 2 0 8 0 extentpl 40 57 0 39 1 0 1 1 0 8 0 phpool 112 356 0 27 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff8274aff0) 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 __mp_lock(ffffffff828db608) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828db608) at __mp_lock+0x129 sys/kern/kern_lock.c:147 intr_handler(ffff8000232d6b40,ffff80000065a300) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge4_untramp() at Xintr_ioapic_edge4_untramp+0x19f __mp_lock(ffffffff828db608) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828db608) 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(ffffffff828db608) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828db608) at __mp_lock+0x122 sys/kern/kern_lock.c:147 ktrstruct(ffff800021272538,ffffffff823bffb5,ffff8000232d6e78,10) at ktrstruct+0xee sys_clock_gettime(ffff800021272538,ffff8000232d6ee0,ffff8000232d6f30) at sys_clock_gettime+0xfb sys/kern/kern_time.c:171 syscall(ffff8000232d6fb0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000232d6fb0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeef20, count: -14 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:398 witness_checkorder(fffffd807a1436f8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd807a1436f8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd807a1436e8,1) at rw_enter+0xd4 rrw_enter(fffffd807a1436e8,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd8068c2e410,2001) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd8068c2e410,2001) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 vget(fffffd8068c2e410,2001) at vget+0x1c6 sys/kern/vfs_subr.c:671 ktrwriteraw(ffff800021273728,fffffd8068c2e410,fffffd807f7b7840,ffff80002129d800,ffff80002129d7e0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021273728,ffffffff823b392d,fffffd80668cfd20,a) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021273728,ffffffff823b392d,fffffd80668cfd20,a) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_connect(ffff800021273728,ffff80002129d948,ffff80002129d990) at sys_connect+0x246 syscall(ffff80002129da10) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002129da10) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d63580a6f0, count: -12