witness: lock order reversal: 1st 0xfffffd8059e7a068 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd805766ba28 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:398 witness_checkorder(fffffd805766ba28,9,0) at witness_checkorder+0x108b rw_enter(fffffd805766ba18,81) at rw_enter+0xd4 rrw_enter(fffffd805766ba18,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8051ec62b8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8051ec62b8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd80555e95b8,0,ffff8000234bff18,ffff8000234bfee8,0,0) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd80555e95b8,0,ffff8000234bff18,ffff8000234bfee8,0,0) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000234c0080,ffff8000234c00b8,ffff8000234c0000,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd80084d6170,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000234c0210,20000240) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262 kerntrap(ffff8000234c0210) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000234c0440) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000234c0440) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75cdb744e40, count: -15 ddb{1}> show registers rdi 0xffff8000234c7000 rsi 0x1918a acpi_pdirpa+0x4ff2 rbp 0xffff8000234bfb90 rbx 0x3 rdx 0xffff8000234c7000 rcx 0x19189 acpi_pdirpa+0x4ff1 rax 0xffffffff81552b07 db_enter+0x17 r8 0xffffffff81bfcea1 witness_checkorder+0x1061 r9 0x5 r10 0xbdb4adb8fa45299a r11 0xb9b09c9f332cf93e r12 0 r13 0xfffffd805766ba28 r14 0 r15 0xfffffd8002cf8740 rip 0xffffffff81552b08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000234bfb80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=54421 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff42a0,0xffffffff8294f3f8 process=0xffff8000ffff2a50 user=0xffff8000234bb000, vmspace=0xfffffd80084d6170 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 12543 75377 26808 32767 7 0x10 syz-executor.1 *12543 54421 26808 32767 7 0x4000010 syz-executor.1 26808 118202 2359 32767 3 0x90 nanoslp syz-executor.1 33085 26571 48109 32767 3 0x10 biowait syz-executor.0 2359 388636 6291 0 3 0x82 wait syz-executor.1 48109 415745 6291 0 3 0x82 wait syz-executor.0 6291 48389 37238 0 3 0x82 thrsleep syz-fuzzer 6291 128529 37238 0 3 0x4000082 nanoslp syz-fuzzer 6291 432636 37238 0 3 0x4000082 thrsleep syz-fuzzer 6291 156528 37238 0 3 0x4000082 thrsleep syz-fuzzer 6291 374301 37238 0 3 0x4000082 thrsleep syz-fuzzer 6291 484349 37238 0 3 0x4000082 thrsleep syz-fuzzer 6291 30631 37238 0 3 0x4000082 kqread syz-fuzzer 6291 387982 37238 0 3 0x4000082 thrsleep syz-fuzzer 37238 69860 89463 0 3 0x10008a sigsusp ksh 89463 408134 45186 0 3 0x92 select sshd 85634 502401 1 0 3 0x100083 ttyin getty 45186 223641 1 0 3 0x80 select sshd 95766 424831 24452 73 3 0x100090 kqread syslogd 24452 440513 1 0 3 0x100082 netio syslogd 55 498766 1 77 3 0x100090 poll dhclient 72650 219033 1 0 3 0x80 poll dhclient 28927 317164 0 0 3 0x14200 bored smr 8867 295683 0 0 3 0x14200 pgzero zerothread 17872 4532 0 0 3 0x14200 aiodoned aiodoned 54777 433102 0 0 3 0x14200 syncer update 20373 436465 0 0 3 0x14200 cleaner cleaner 64083 311096 0 0 3 0x14200 reaper reaper 63050 165410 0 0 3 0x14200 pgdaemon pagedaemon 81810 202022 0 0 3 0x14200 bored crynlk 28588 391422 0 0 3 0x14200 bored crypto 38817 362852 0 0 3 0x14200 bored viomb 51215 444833 0 0 3 0x40014200 acpi0 acpi0 9223 157602 0 0 3 0x40014200 idle1 70064 420663 0 0 3 0x14200 bored softnet 38392 413784 0 0 3 0x14200 bored systqmp 82282 105674 0 0 3 0x14200 bored systq 56488 397082 0 0 3 0x40014200 bored softclock 75480 394130 0 0 3 0x40014200 idle0 1 175887 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 12543 (syz-executor.1) thread 0xffff8000ffff4fc0 (54421) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82825a48) #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 (0xfffffd8059e7a068) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 sys_socketpair+0x219 #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 Process 33085 (syz-executor.0) thread 0xffff8000ffff5ce0 (26571) exclusive rrwlock inode r = 0 (0xfffffd805766be68) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 rw_enter+0x416 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1f7 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x6b sys/ufs/ffs/ffs_vfsops.c:1321 #8 ufs_lookup+0x151d sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:88 #10 vfs_lookup+0x708 sys/kern/vfs_lookup.c:562 #11 namei+0x58a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1859 #13 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b77e708) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 rw_enter+0x416 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:413 #6 namei+0x58a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1859 #8 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10114 6414K 6414K 78643K 11204 0 pcb 13 8K 8K 78643K 13 0 rtable 105 3K 3K 78643K 187 0 ifaddr 39 10K 10K 78643K 39 0 counters 44 34K 34K 78643K 44 0 ioctlops 0 0K 2K 78643K 72 0 iov 0 0K 24K 78643K 46 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1216 76K 76K 78643K 1224 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 10485 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 25416 0 sigio 0 0K 0K 78643K 2 0 proc 48 50K 83K 78643K 380 0 subproc 34 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2 0 in_multi 33 2K 2K 78643K 33 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 2K 78643K 319 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 622 65K 74K 78643K 308616 0 UVM aobj 19 2K 2K 78643K 21 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 2 0 NDP 5 0K 0K 78643K 9 0 temp 101 3981K 4045K 78643K 52600 0 kqueue 3 4K 10K 78643K 24 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 20 0 0 1 0 1 1 0 8 0 rtpcb 120 21 0 19 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 308 0 298 1 0 1 1 0 8 0 syncache 296 6 0 6 2 2 0 1 0 8 0 tcpqe 32 4961 0 4961 4 4 0 3 0 8 0 tcpcb 736 4738 0 4722 20 17 3 5 0 8 1 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 4765 0 4759 2 1 1 2 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semupl 112 9 0 9 1 1 0 1 0 8 0 semapl 112 10474 0 10464 1 0 1 1 0 8 0 shmpl 112 18 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 27661 0 26263 88 0 88 88 0 8 0 ffsino 272 27661 0 26263 94 0 94 94 0 8 0 nchpl 144 54718 0 53118 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 114116 0 114116 2 1 1 1 0 8 1 percpumem 16 33 0 0 1 0 1 1 0 8 0 scxspl 216 159867 0 159866 10 9 1 8 0 8 0 plimitpl 152 19 0 10 1 0 1 1 0 8 0 sigapl 424 25603 0 25571 4 0 4 4 0 8 0 futexpl 56 187275 0 187275 1 0 1 1 0 8 1 knotepl 112 79 0 59 1 0 1 1 0 8 0 kqueuepl 168 35269 0 35266 1 0 1 1 0 8 0 pipepl 336 453 0 442 7 5 2 2 0 8 1 fdescpl 496 25587 0 25571 3 0 3 3 0 8 0 filepl 152 73669 0 73567 15 10 5 5 0 8 1 lockfpl 104 1721 0 1718 1 0 1 1 0 8 0 lockfspl 48 856 0 853 1 0 1 1 0 8 0 sessionpl 144 17 0 7 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 1764 0 1755 1 0 1 1 0 8 0 zombiepl 144 25571 0 25571 2 1 1 1 0 8 1 processpl 1080 25603 0 25571 5 2 3 3 0 8 0 procpl 672 52204 0 52164 4 0 4 4 0 8 0 sockpl 480 5105 0 5087 6 3 3 4 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 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 16 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 15 0 0 1 0 1 1 0 8 0 mcl2k 2048 597 0 0 66 12 54 66 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 889 0 0 35 0 35 35 0 8 0 bufpl 280 28687 0 22425 448 0 448 448 0 8 0 anonpl 24 6376410 0 6291199 622 5 617 620 0 186 0 amapchunkpl 152 709008 0 705572 160 6 154 157 0 158 0 amappl16 200 44316 0 41808 134 1 133 133 0 8 0 amappl15 192 12702 0 12694 1 0 1 1 0 8 0 amappl14 184 9 0 3 1 0 1 1 0 8 0 amappl13 176 945 0 941 1 0 1 1 0 8 0 amappl12 168 31 0 25 1 0 1 1 0 8 0 amappl11 160 12789 0 12778 1 0 1 1 0 8 0 amappl10 152 50 0 44 1 0 1 1 0 8 0 amappl9 144 286 0 285 1 0 1 1 0 8 0 amappl8 136 309 0 263 2 0 2 2 0 8 0 amappl7 128 55 0 44 1 0 1 1 0 8 0 amappl6 120 97 0 82 1 0 1 1 0 8 0 amappl5 112 25983 0 25971 1 0 1 1 0 8 0 amappl4 104 13769 0 13737 1 0 1 1 0 8 0 amappl3 96 1635 0 1629 1 0 1 1 0 8 0 amappl2 88 485 0 440 2 0 2 2 0 8 0 amappl1 80 452132 0 451719 15 6 9 11 0 8 0 amappl 88 298277 0 297717 13 0 13 13 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 20 0 2 1 0 1 1 0 8 0 uaddrrnd 24 25587 0 25571 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 25587 0 25571 1 0 1 1 0 8 0 vmmpekpl 168 102150 0 102124 2 0 2 2 0 8 0 vmmpepl 168 2897619 0 2893343 304 112 192 295 0 357 2 vmsppl 368 25586 0 25571 2 0 2 2 0 8 0 rwobjpl 56 481584 0 477980 56 4 52 52 0 8 1 pdppl 4096 51181 0 51142 62 21 41 45 0 8 2 pvpl 32 12569225 0 12480642 866 12 854 860 0 265 0 pmappl 232 25586 0 25571 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 407 0 58 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82720ff0) 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(ffffffff82825840) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82825840) at __mp_lock+0x129 sys/kern/kern_lock.c:147 intr_handler(ffff8000256cc0a0,ffff80000006a400) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge17_untramp() at Xintr_ioapic_edge17_untramp+0x18f end of kernel end trace frame: 0x7f7ffffed330, 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:398 witness_checkorder(fffffd805766ba28,9,0) at witness_checkorder+0x108b rw_enter(fffffd805766ba18,81) at rw_enter+0xd4 rrw_enter(fffffd805766ba18,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8051ec62b8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8051ec62b8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd80555e95b8,0,ffff8000234bff18,ffff8000234bfee8,0,0) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd80555e95b8,0,ffff8000234bff18,ffff8000234bfee8,0,0) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000234c0080,ffff8000234c00b8,ffff8000234c0000,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd80084d6170,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000234c0210,20000240) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262 kerntrap(ffff8000234c0210) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000234c0440) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000234c0440) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75cdb744e40, count: -15