witness: lock order reversal: 1st 0xfffffd806f22d060 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80727660a0 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{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:399 witness_checkorder(fffffd80727660a0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80727660a0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd8072766090,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd8072766090,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8073bbc498,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8073bbc498,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd807445e880,0,ffff8000256932d8,ffff8000256932a8,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd807445e880,0,ffff8000256932d8,ffff8000256932a8,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800025693440,ffff800025693478,ffff8000256933c0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd80085825c0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000256935d0,20000400) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000256935d0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800025693810) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800025693810) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfe6a1700790, count: -15 ddb{1}> show registers rdi 0xffff800021266000 rsi 0x169b8 acpi_pdirpa+0x2820 rbp 0xffff800025692f50 rbx 0x3 rdx 0xffff800021266000 rcx 0x169b7 acpi_pdirpa+0x281f rax 0xffffffff8143b2a7 db_enter+0x17 r8 0xffffffff81222ddc witness_checkorder+0x10cc r9 0x5 r10 0x9260b21736a41fe8 r11 0x7bb03e3877b9802a r12 0xfffffd8002dab7c0 r13 0 r14 0 r15 0 rip 0xffffffff8143b2a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800025692f40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=266884 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000212547f0,0xffffffff8295b308 process=0xffff800021208ca0 user=0xffff80002568e000, vmspace=0xfffffd80085825c0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77776 383285 30650 32767 7 0x10 syz-executor.0 *77776 266884 30650 32767 7 0x4000010 syz-executor.0 66049 413965 36393 32767 3 0x90 nanoslp syz-executor.1 36393 390157 42366 0 3 0x82 wait syz-executor.1 30650 483687 30502 32767 3 0x90 nanoslp syz-executor.0 30502 266509 42366 0 3 0x82 wait syz-executor.0 79626 467744 0 0 3 0x14200 bored sosplice 42366 493201 74871 0 3 0x82 thrsleep syz-fuzzer 42366 60353 74871 0 3 0x4000082 nanoslp syz-fuzzer 42366 161599 74871 0 3 0x4000082 thrsleep syz-fuzzer 42366 55461 74871 0 3 0x4000082 thrsleep syz-fuzzer 42366 23733 74871 0 3 0x4000082 thrsleep syz-fuzzer 42366 380467 74871 0 3 0x4000082 thrsleep syz-fuzzer 42366 183943 74871 0 3 0x4000082 kqread syz-fuzzer 42366 5687 74871 0 3 0x4000082 thrsleep syz-fuzzer 74871 506352 54313 0 3 0x10008a sigsusp ksh 54313 388875 17194 0 3 0x9a select sshd 94347 136065 1 0 3 0x100083 ttyin getty 17194 250419 1 0 3 0x88 select sshd 21566 80213 94423 73 3 0x100090 kqread syslogd 94423 15135 1 0 3 0x100082 netio syslogd 92349 415525 1 0 3 0x100080 kqread resolvd 17211 304930 88638 77 3 0x100092 kqread dhcpleased 6056 332637 88638 77 3 0x100092 kqread dhcpleased 88638 430623 1 0 3 0x80 kqread dhcpleased 10894 153653 0 0 3 0x14200 bored smr 91810 428460 0 0 3 0x14200 pgzero zerothread 38606 54740 0 0 3 0x14200 aiodoned aiodoned 18292 114569 0 0 3 0x14200 syncer update 64067 292276 0 0 3 0x14200 cleaner cleaner 58948 46346 0 0 3 0x14200 reaper reaper 80200 487965 0 0 3 0x14200 pgdaemon pagedaemon 76251 241049 0 0 3 0x14200 bored crynlk 97321 380945 0 0 3 0x14200 bored crypto 53248 414019 0 0 3 0x14200 bored viomb 25826 189018 0 0 3 0x40014200 acpi0 acpi0 28852 199945 0 0 3 0x40014200 idle1 52523 418267 0 0 3 0x14200 bored softnet 38750 415933 0 0 3 0x14200 bored systqmp 22574 420019 0 0 3 0x14200 bored systq 12334 18335 0 0 3 0x40014200 bored softclock 13855 211461 0 0 3 0x40014200 idle0 1 349405 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 77776 (syz-executor.0) thread 0xffff800021254550 (266884) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829423a8) #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 (0xfffffd806f22d060) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10118 6354K 6380K 78643K 11226 0 pcb 13 8K 8K 78643K 13 0 rtable 112 3K 3K 78643K 483 0 ifaddr 39 10K 10K 78643K 84 0 counters 44 34K 34K 78643K 56 0 ioctlops 0 0K 2K 78643K 154 0 iov 0 0K 24K 78643K 410 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1216 76K 77K 78643K 1481 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 32 0 VM map 2 1K 1K 78643K 2 0 sem 10 1K 1K 78643K 18 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 11351 0 sigio 0 0K 0K 78643K 84 0 proc 56 74K 99K 78643K 606 0 subproc 34 2K 2K 78643K 136 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 637 0 in_multi 33 2K 2K 78643K 277 0 ether_multi 1 0K 0K 78643K 46 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 1309 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 341 38K 47K 78643K 140100 0 UVM aobj 45 2K 4K 78643K 89 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 303 0 NDP 5 0K 0K 78643K 27 0 temp 102 4209K 4273K 78643K 25902 0 kqueue 11 16K 21K 78643K 352 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 plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 184 0 181 1 0 1 1 0 8 0 rtentry 112 118 0 71 2 0 2 2 0 8 0 unpcb 120 2874 0 2845 4 2 2 2 0 8 0 syncache 296 116 0 116 12 12 0 1 0 8 0 tcpqe 32 303 0 303 16 16 0 1 0 8 0 tcpcb 736 1547 0 1542 20 19 1 6 0 8 0 arp 120 21 0 14 1 0 1 1 0 8 0 ipq 40 4 0 4 2 2 0 1 0 8 0 ipqe 40 11 0 11 2 2 0 1 0 8 0 inpcb 304 3330 0 3318 7 5 2 3 0 8 0 ip6q 72 6 0 6 4 4 0 1 0 8 0 ip6af 40 11 0 11 4 4 0 1 0 8 0 nd6 48 28 0 20 1 0 1 1 0 8 0 kcovpl 48 8 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 489 0 277 14 0 14 14 0 8 0 art_table 32 490 0 277 2 0 2 2 0 8 0 art_node 16 117 0 74 1 0 1 1 0 8 0 sysvmsgpl 40 38 0 20 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 86 0 44 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 13966 0 12559 92 3 89 89 0 8 0 ffsino 272 13966 0 12559 95 0 95 95 0 8 0 nchpl 144 28796 0 27190 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 64266 0 64266 2 1 1 1 0 8 1 percpumem 16 40 0 6 1 0 1 1 0 8 0 scxspl 216 78695 0 78695 13 12 1 8 0 8 1 plimitpl 152 187 0 177 1 0 1 1 0 8 0 sigapl 424 11556 0 11521 7 2 5 5 0 8 1 futexpl 56 136563 0 136563 2 1 1 1 0 8 1 knotepl 112 65 0 0 2 0 2 2 0 8 0 kqueuepl 216 16034 0 16024 10 8 2 2 0 8 1 pipepl 336 766 0 755 10 8 2 2 0 8 0 fdescpl 496 11539 0 11521 3 0 3 3 0 8 0 filepl 152 44236 0 44122 9 4 5 6 0 8 0 lockfpl 104 1403 0 1399 1 0 1 1 0 8 0 lockfspl 48 555 0 551 1 0 1 1 0 8 0 sessionpl 144 23 0 13 1 0 1 1 0 8 0 pgrppl 48 46 0 36 1 0 1 1 0 8 0 ucredpl 96 2944 0 2932 1 0 1 1 0 8 0 zombiepl 144 11521 0 11520 1 0 1 1 0 8 0 processpl 1072 11556 0 11520 3 0 3 3 0 8 0 procpl 672 25768 0 25724 18 13 5 5 0 8 0 sosppl 168 97 0 97 12 12 0 1 0 8 0 sockpl 480 6454 0 6414 14 8 6 9 0 8 0 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 3 1 2 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 410 0 0 28 1 27 27 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 899 0 0 37 0 37 37 0 8 0 bufpl 280 15885 0 9553 453 0 453 453 0 8 0 anonpl 24 2963753 0 2939483 167 18 149 156 0 186 0 amapchunkpl 152 327099 0 326473 42 16 26 29 0 158 1 amappl16 200 19754 0 18748 62 8 54 60 0 8 1 amappl15 192 4107 0 4105 1 0 1 1 0 8 0 amappl14 184 8 0 5 1 0 1 1 0 8 0 amappl13 176 1226 0 1225 1 0 1 1 0 8 0 amappl12 168 508 0 504 1 0 1 1 0 8 0 amappl11 160 522 0 512 1 0 1 1 0 8 0 amappl10 152 54 0 48 1 0 1 1 0 8 0 amappl9 144 242 0 239 1 0 1 1 0 8 0 amappl8 136 5897 0 5740 7 1 6 6 0 8 0 amappl7 128 5204 0 5187 1 0 1 1 0 8 0 amappl6 120 169 0 151 1 0 1 1 0 8 0 amappl5 112 10592 0 10575 1 0 1 1 0 8 0 amappl4 104 1952 0 1921 1 0 1 1 0 8 0 amappl3 96 1319 0 1315 1 0 1 1 0 8 0 amappl2 88 2416 0 2359 2 0 2 2 0 8 0 amappl1 80 197500 0 197062 12 2 10 12 0 8 0 amappl 88 136871 0 136708 6 1 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 88 0 44 1 0 1 1 0 8 0 uaddrrnd 24 11539 0 11521 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11539 0 11521 1 0 1 1 0 8 0 vmmpekpl 168 55929 0 55906 2 0 2 2 0 8 0 vmmpepl 168 1329814 0 1327248 138 21 117 122 0 357 2 vmsppl 368 11538 0 11521 2 0 2 2 0 8 0 rwobjpl 56 223395 0 221540 32 5 27 29 0 8 0 pdppl 4096 23085 0 23042 71 26 45 49 0 8 2 pvpl 32 7169929 0 7141992 314 80 234 243 0 265 5 pmappl 224 11538 0 11521 3 1 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 391 0 62 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(ffffffff82807ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:353 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(ffffffff829421a0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829421a0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7ffffcbf60, count: -6 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:399 witness_checkorder(fffffd80727660a0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80727660a0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd8072766090,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd8072766090,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8073bbc498,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8073bbc498,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd807445e880,0,ffff8000256932d8,ffff8000256932a8,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd807445e880,0,ffff8000256932d8,ffff8000256932a8,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800025693440,ffff800025693478,ffff8000256933c0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd80085825c0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000256935d0,20000400) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000256935d0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800025693810) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800025693810) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfe6a1700790, count: -15