witness: lock order reversal: 1st 0xfffffd806b04dbf8 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80699590a0 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(fffffd80699590a0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80699590a0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd8069959090,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd8069959090,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80642a61d8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80642a61d8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8068d10690,0,ffff800023493878,ffff800023493848,0,0,da96cc3c201cde8e,ffffffff8167af90) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8068d10690,0,ffff800023493878,ffff800023493848,0,0,da96cc3c201cde8e,ffffffff8167af90) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000234939e0,ffff800023493a18,ffff800023493960,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd8008596000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800023493b70,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800023493b70) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800023493db0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023493db0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8b90c416dc0, count: -15 ddb{0}> show registers rdi 0xffff800022688000 rsi 0x7953 __ALIGN_SIZE+0x6953 rbp 0xffff8000234934f0 rbx 0x3 rdx 0xffff800022688000 rcx 0x7952 __ALIGN_SIZE+0x6952 rax 0xffffffff81912637 db_enter+0x17 r8 0xffffffff81a76a9c witness_checkorder+0x10cc r9 0x5 r10 0x2a04837b89ed2d4 r11 0xadf3d1780d734fdd r12 0xfffffd8002dbf900 r13 0 r14 0 r15 0 rip 0xffffffff81912638 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000234934e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=195145 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff8000226867e0,0xffff8000226862b0 process=0xffff8000ffff8438 user=0xffff80002348e000, vmspace=0xfffffd8008596000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 78404 258187 89496 32767 7 0x10 syz-executor.1 3006 340831 59095 32767 2 0x10 syz-executor.0 * 3006 195145 59095 32767 7 0x4000010 syz-executor.0 59095 358892 34419 32767 3 0x90 nanoslp syz-executor.0 34419 187073 47960 0 3 0x82 wait syz-executor.0 89496 322888 4571 32767 3 0x90 nanoslp syz-executor.1 4571 344994 47960 0 3 0x82 wait syz-executor.1 56690 374309 0 0 3 0x14200 bored sosplice 47960 169950 49790 0 3 0x82 thrsleep syz-fuzzer 47960 486714 49790 0 3 0x4000082 thrsleep syz-fuzzer 47960 480742 49790 0 3 0x4000082 thrsleep syz-fuzzer 47960 93059 49790 0 3 0x4000082 thrsleep syz-fuzzer 47960 368302 49790 0 3 0x4000082 thrsleep syz-fuzzer 47960 375236 49790 0 3 0x4000082 thrsleep syz-fuzzer 47960 327064 49790 0 3 0x4000082 kqread syz-fuzzer 47960 159673 49790 0 3 0x4000082 thrsleep syz-fuzzer 47960 370799 49790 0 3 0x4000082 thrsleep syz-fuzzer 49790 358248 16556 0 3 0x10008a sigsusp ksh 16556 278457 95688 0 3 0x9a select sshd 78325 174212 1 0 3 0x100083 ttyin getty 95688 482752 1 0 3 0x88 select sshd 86165 523039 15579 73 3 0x100090 kqread syslogd 15579 30770 1 0 3 0x100082 netio syslogd 90501 300395 1 0 3 0x100080 kqread resolvd 30356 376547 95819 77 3 0x100092 kqread dhcpleased 11274 9152 95819 77 3 0x100092 kqread dhcpleased 95819 464345 1 0 3 0x80 kqread dhcpleased 63679 345458 0 0 3 0x14200 bored smr 95172 17242 0 0 2 0x14200 zerothread 16622 138182 0 0 3 0x14200 aiodoned aiodoned 65205 80143 0 0 3 0x14200 syncer update 91262 248308 0 0 3 0x14200 cleaner cleaner 42539 169386 0 0 3 0x14200 reaper reaper 25216 50054 0 0 3 0x14200 pgdaemon pagedaemon 52162 263395 0 0 3 0x14200 bored crynlk 5924 211383 0 0 3 0x14200 bored crypto 79972 200918 0 0 3 0x14200 bored viomb 69621 83722 0 0 3 0x40014200 acpi0 acpi0 38345 493159 0 0 3 0x40014200 idle1 58152 517887 0 0 3 0x14200 bored softnet 23569 424112 0 0 3 0x14200 bored systqmp 30763 120208 0 0 3 0x14200 bored systq 84277 152812 0 0 3 0x40014200 bored softclock 94443 87727 0 0 3 0x40014200 idle0 1 314756 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 78404 (syz-executor.1) thread 0xffff8000226862a0 (258187) exclusive rwlock amaplk r = 0 (0xfffffd806615e198) #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_check+0x3d2 sys/uvm/uvm_fault.c:774 #2 uvm_fault+0x102 sys/uvm/uvm_fault.c:601 #3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #4 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd80085968b8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:601 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 Process 3006 (syz-executor.0) thread 0xffff800022687ce0 (195145) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828e34f0) #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 (0xfffffd806b04dbf8) #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 10118 6407K 6433K 78643K 11238 0 pcb 13 8K 8K 78643K 13 0 rtable 110 3K 3K 78643K 628 0 ifaddr 39 10K 10K 78643K 114 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 64 0 ioctlops 0 0K 2K 78643K 148 0 iov 0 0K 16K 78643K 356 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1216 76K 76K 78643K 1533 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 33 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 7129 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 11354 0 sigio 0 0K 0K 78643K 33 0 proc 56 74K 98K 78643K 728 0 subproc 34 2K 2K 78643K 204 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 447 0 in_multi 33 2K 2K 78643K 225 0 ether_multi 1 0K 0K 78643K 30 0 mrt 3 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 1193 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 387 66K 66K 78643K 140247 0 UVM aobj 71 3K 3K 78643K 92 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 200 0 NDP 5 0K 0K 78643K 39 0 temp 102 4213K 4341K 78643K 26373 0 kqueue 11 16K 22K 78643K 277 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 120 280 0 277 1 0 1 1 0 8 0 rtentry 112 162 0 116 2 0 2 2 0 8 0 unpcb 120 7718 0 7696 3 2 1 2 0 8 0 syncache 296 75 0 75 10 10 0 1 0 8 0 tcpqe 32 1187 0 1187 13 13 0 2 0 8 0 tcpcb 736 1185 0 1181 19 18 1 7 0 8 0 arp 120 27 0 20 1 0 1 1 0 8 0 ipq 40 8 0 8 5 5 0 1 0 8 0 ipqe 40 22 0 22 5 5 0 1 0 8 0 inpcb 304 3767 0 3758 8 7 1 2 0 8 0 rttmr 72 5 0 5 1 1 0 1 0 8 0 ip6q 72 3 0 3 1 1 0 1 0 8 0 ip6af 40 5 0 5 1 1 0 1 0 8 0 nd6 48 41 0 34 1 0 1 1 0 8 0 kcovpl 48 12 0 10 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 676 0 485 15 3 12 14 0 8 0 art_table 32 677 0 485 2 0 2 2 0 8 0 art_node 16 161 0 119 1 0 1 1 0 8 0 sysvmsgpl 40 29 0 29 1 1 0 1 0 8 0 semupl 112 8 0 8 1 1 0 1 0 8 0 semapl 112 7119 0 7109 1 0 1 1 0 8 0 shmpl 112 89 0 21 4 2 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 14053 0 12648 90 2 88 89 0 8 0 ffsino 272 14053 0 12648 95 0 95 95 0 8 0 nchpl 144 29162 0 27559 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 73234 0 73234 2 1 1 1 0 8 1 percpumem 16 44 0 10 1 0 1 1 0 8 0 scxspl 216 78347 0 78347 11 10 1 8 0 8 1 plimitpl 152 198 0 188 1 0 1 1 0 8 0 sigapl 424 11557 0 11521 5 0 5 5 0 8 1 futexpl 56 155196 0 155196 2 1 1 1 0 8 1 knotepl 112 76 0 0 2 0 2 2 0 8 0 kqueuepl 216 15745 0 15737 12 11 1 2 0 8 0 pipepl 336 902 0 891 12 10 2 3 0 8 1 fdescpl 496 11540 0 11521 4 1 3 3 0 8 0 filepl 152 57029 0 56915 13 7 6 7 0 8 1 lockfpl 104 917 0 914 1 0 1 1 0 8 0 lockfspl 48 375 0 372 1 0 1 1 0 8 0 sessionpl 144 27 0 17 1 0 1 1 0 8 0 pgrppl 48 49 0 39 1 0 1 1 0 8 0 ucredpl 96 7786 0 7774 1 0 1 1 0 8 0 zombiepl 144 11521 0 11521 1 0 1 1 0 8 1 processpl 1072 11557 0 11521 3 0 3 3 0 8 0 procpl 672 25725 0 25680 10 5 5 5 0 8 0 sosppl 168 101 0 101 10 10 0 1 0 8 0 sockpl 480 11816 0 11783 9 3 6 8 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 1 2 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 16 0 0 2 0 2 2 0 8 0 mcl2k 2048 621 0 0 40 2 38 40 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1428 0 0 89 0 89 89 0 8 0 bufpl 280 20764 0 14440 453 0 453 453 0 8 0 anonpl 24 2995721 0 2969716 223 59 164 175 0 186 0 amapchunkpl 152 326886 0 325897 44 4 40 40 0 158 1 amappl16 200 22148 0 21317 103 59 44 57 0 8 0 amappl15 192 111 0 104 1 0 1 1 0 8 0 amappl14 184 6484 0 6482 2 1 1 1 0 8 0 amappl13 176 2780 0 2775 1 0 1 1 0 8 0 amappl12 168 9 0 2 1 0 1 1 0 8 0 amappl11 160 123 0 109 1 0 1 1 0 8 0 amappl10 152 20 0 19 1 0 1 1 0 8 0 amappl9 144 1258 0 1254 1 0 1 1 0 8 0 amappl8 136 1548 0 1412 5 0 5 5 0 8 0 amappl7 128 897 0 886 1 0 1 1 0 8 0 amappl6 120 1344 0 1327 1 0 1 1 0 8 0 amappl5 112 6572 0 6554 1 0 1 1 0 8 0 amappl4 104 6652 0 6623 1 0 1 1 0 8 0 amappl3 96 887 0 871 1 0 1 1 0 8 0 amappl2 88 3348 0 3304 3 1 2 2 0 8 0 amappl1 80 204838 0 204386 12 2 10 12 0 8 0 amappl 88 136510 0 136279 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 91 0 21 2 0 2 2 0 8 0 uaddrrnd 24 11540 0 11521 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11540 0 11521 1 0 1 1 0 8 0 vmmpekpl 168 56706 0 56680 2 0 2 2 0 8 0 vmmpepl 168 1331955 0 1329427 202 90 112 145 0 357 1 vmsppl 368 11539 0 11521 2 0 2 2 0 8 0 rwobjpl 56 227287 0 225588 39 14 25 28 0 8 0 pdppl 4096 23088 0 23042 71 25 46 50 0 8 0 pvpl 32 7612250 0 7582556 376 128 248 270 0 265 2 pmappl 224 11539 0 11521 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 454 0 64 12 0 12 12 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(fffffd80699590a0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80699590a0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd8069959090,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd8069959090,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80642a61d8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80642a61d8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8068d10690,0,ffff800023493878,ffff800023493848,0,0,da96cc3c201cde8e,ffffffff8167af90) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8068d10690,0,ffff800023493878,ffff800023493848,0,0,da96cc3c201cde8e,ffffffff8167af90) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000234939e0,ffff800023493a18,ffff800023493960,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd8008596000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800023493b70,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800023493b70) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800023493db0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023493db0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8b90c416dc0, 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 __mp_lock(ffffffff828e32e8) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828e32e8) at __mp_lock+0x129 sys/kern/kern_lock.c:147 uvm_fault(fffffd80085968a0,3886f31f000,0,2) at uvm_fault+0x224 sys/uvm/uvm_fault.c:637 upageflttrap(ffff8000234b1cf0,3886f31f470) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000234b1cf0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff66b0, count: -8