witness: lock order reversal: 1st 0xfffffd806c9a1638 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806c74a918 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(fffffd806c74a918,9,0) at witness_checkorder+0x108b rw_enter(fffffd806c74a908,81) at rw_enter+0xd4 rrw_enter(fffffd806c74a908,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806031c0f8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806031c0f8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd807dde1768,0,ffff8000256da1c8,ffff8000256da198,0,2) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd807dde1768,0,ffff8000256da1c8,ffff8000256da198,0,2) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000256da330,ffff8000256da368,ffff8000256da2b0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807f00a730,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000256da4c0,200007c0) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff8000256da4c0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000256da6f0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000256da6f0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3688ccff00, count: -15 ddb{1}> show registers rdi 0xffff8000212ad000 rsi 0x15adf acpi_pdirpa+0x1947 rbp 0xffff8000256d9e40 rbx 0x3 rdx 0xffff8000212ad000 rcx 0x15ade acpi_pdirpa+0x1946 rax 0xffffffff81dfd2b7 db_enter+0x17 r8 0xffffffff82164361 witness_checkorder+0x1061 r9 0x5 r10 0xaef39eb51642d853 r11 0x33b793cc583d8193 r12 0 r13 0xfffffd806c74a918 r14 0 r15 0xfffffd8002cf66c0 rip 0xffffffff81dfd2b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000256d9e30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=161301 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000212147e0,0xffffffff82797348 process=0xffff8000212110f0 user=0xffff8000256d5000, vmspace=0xfffffd807f00a730 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 50311 521928 75314 32767 7 0x10 syz-executor.0 *50311 161301 75314 32767 7 0x4000010 syz-executor.0 77575 29698 0 0 3 0x14200 bored sosplice 94606 116212 25996 32767 3 0x10 biowait syz-executor.1 75314 160262 61606 32767 3 0x90 nanoslp syz-executor.0 25996 173927 3738 0 3 0x82 wait syz-executor.1 61606 385925 3738 0 3 0x82 wait syz-executor.0 3738 381588 93799 0 3 0x82 thrsleep syz-fuzzer 3738 374732 93799 0 3 0x4000082 nanoslp syz-fuzzer 3738 492804 93799 0 3 0x4000082 thrsleep syz-fuzzer 3738 505321 93799 0 3 0x4000082 thrsleep syz-fuzzer 3738 276989 93799 0 3 0x4000082 kqread syz-fuzzer 3738 259839 93799 0 3 0x4000082 thrsleep syz-fuzzer 3738 188376 93799 0 3 0x4000082 thrsleep syz-fuzzer 3738 279180 93799 0 3 0x4000082 nanoslp syz-fuzzer 93799 295301 18110 0 3 0x10008a sigsusp ksh 18110 213325 90567 0 3 0x92 select sshd 20254 433186 1 0 3 0x100083 ttyin getty 90567 23932 1 0 3 0x80 select sshd 24581 355770 16820 73 3 0x100090 kqread syslogd 16820 141581 1 0 3 0x100082 netio syslogd 90879 191001 1 77 3 0x100090 poll dhclient 93365 188572 1 0 3 0x80 poll dhclient 94504 121638 0 0 3 0x14200 bored smr 50404 31125 0 0 3 0x14200 pgzero zerothread 24374 449872 0 0 3 0x14200 aiodoned aiodoned 79824 514265 0 0 3 0x14200 syncer update 58131 261016 0 0 3 0x14200 cleaner cleaner 42967 230891 0 0 3 0x14200 reaper reaper 7182 187750 0 0 3 0x14200 pgdaemon pagedaemon 77207 475121 0 0 3 0x14200 bored crynlk 2831 410242 0 0 3 0x14200 bored crypto 89089 395307 0 0 3 0x14200 bored viomb 74970 251449 0 0 3 0x40014200 acpi0 acpi0 11431 55782 0 0 3 0x40014200 idle1 67793 492521 0 0 3 0x14200 bored softnet 52102 381739 0 0 3 0x14200 bored systqmp 14508 161013 0 0 3 0x14200 bored systq 28944 260339 0 0 3 0x40014200 bored softclock 80062 281399 0 0 3 0x40014200 idle0 1 253683 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 50311 (syz-executor.0) thread 0xffff800021214fc0 (161301) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82890960) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 kpageflttrap+0x1f1 sys/arch/amd64/amd64/trap.c:265 #2 kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 #3 alltraps_kern_meltdown+0x7b #4 copyout+0x53 #5 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #6 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd806c9a1638) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 dopipe+0xe0 #2 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #3 Xsyscall+0x128 Process 94606 (syz-executor.1) thread 0xffff800021214d20 (116212) exclusive rrwlock inode r = 0 (0xfffffd806c74ae68) #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 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x135 sys/ufs/ffs/ffs_vfsops.c:1350 #5 ffs_inode_alloc+0x1e1 sys/ufs/ffs/ffs_alloc.c:394 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3075 #9 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b76eb48) #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 domkdirat+0x75 sys/kern/vfs_syscalls.c:3060 #8 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10117 6414K 6414K 78643K 11207 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 24 0 iov 0 0K 12K 78643K 568 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1216 76K 76K 78643K 1226 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 85 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 4416 0 sigio 0 0K 0K 78643K 12 0 proc 48 50K 70K 78643K 355 0 subproc 34 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 0 ether_multi 1 0K 0K 78643K 1 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 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 320 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 568 58K 58K 78643K 53943 0 UVM aobj 10 2K 2K 78643K 12 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 5 0K 0K 78643K 9 0 temp 102 3985K 4049K 78643K 10603 0 kqueue 3 4K 8K 78643K 172 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 23 0 21 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 175 0 167 1 0 1 1 0 8 0 syncache 296 6 0 6 2 1 1 1 0 8 1 tcpqe 32 6654 0 6654 4 4 0 3 0 8 0 tcpcb 736 292 0 282 6 4 2 3 0 8 0 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 5318 0 5312 4 2 2 2 0 8 1 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 sysvmsgpl 40 18 0 3 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 83 0 73 1 0 1 1 0 8 0 shmpl 112 9 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 5905 0 4507 88 0 88 88 0 8 0 ffsino 272 5905 0 4507 94 0 94 94 0 8 0 nchpl 144 10723 0 9122 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 23727 0 23726 2 1 1 1 0 8 0 percpumem 16 33 0 0 1 0 1 1 0 8 0 scxspl 216 31439 0 31438 10 9 1 8 0 8 0 plimitpl 152 16 0 7 1 0 1 1 0 8 0 sigapl 424 4604 0 4571 4 0 4 4 0 8 0 futexpl 56 34317 0 34317 1 0 1 1 0 8 1 knotepl 112 155 0 135 1 0 1 1 0 8 0 kqueuepl 168 4779 0 4775 1 0 1 1 0 8 0 pipepl 336 117 0 104 3 1 2 2 0 8 0 fdescpl 496 4587 0 4571 3 0 3 3 0 8 0 filepl 152 17654 0 17549 6 1 5 5 0 8 0 lockfpl 104 196 0 194 1 0 1 1 0 8 0 lockfspl 48 99 0 97 1 0 1 1 0 8 0 sessionpl 144 17 0 7 1 0 1 1 0 8 0 pgrppl 48 17 0 7 1 0 1 1 0 8 0 ucredpl 96 150 0 141 1 0 1 1 0 8 0 zombiepl 144 4571 0 4571 2 1 1 1 0 8 1 processpl 1080 4604 0 4571 3 0 3 3 0 8 0 procpl 672 9625 0 9584 4 0 4 4 0 8 0 sosppl 168 1 0 1 1 1 0 1 0 8 0 sockpl 432 5524 0 5508 4 0 4 4 0 8 2 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 602 0 0 74 0 74 74 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 634 0 0 40 1 39 39 0 8 0 bufpl 280 7666 0 1402 448 0 448 448 0 8 0 anonpl 24 1241923 0 1150203 616 2 614 616 0 186 0 amapchunkpl 152 129715 0 126278 146 1 145 146 0 158 0 amappl16 200 9055 0 6185 153 1 152 152 0 8 0 amappl15 192 53 0 47 1 0 1 1 0 8 0 amappl14 184 2215 0 2209 1 0 1 1 0 8 0 amappl13 176 71 0 70 1 0 1 1 0 8 0 amappl12 168 40 0 30 1 0 1 1 0 8 0 amappl11 160 49 0 38 1 0 1 1 0 8 0 amappl10 152 21 0 17 1 0 1 1 0 8 0 amappl9 144 286 0 285 1 0 1 1 0 8 0 amappl8 136 4651 0 4614 2 0 2 2 0 8 0 amappl7 128 52 0 42 1 0 1 1 0 8 0 amappl6 120 103 0 85 1 0 1 1 0 8 0 amappl5 112 2316 0 2305 1 0 1 1 0 8 0 amappl4 104 2652 0 2625 1 0 1 1 0 8 0 amappl3 96 66 0 60 1 0 1 1 0 8 0 amappl2 88 2586 0 2540 3 1 2 2 0 8 0 amappl1 80 78935 0 78528 13 3 10 11 0 8 0 amappl 88 53440 0 52929 12 0 12 12 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 11 0 2 1 0 1 1 0 8 0 uaddrrnd 24 4587 0 4571 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4587 0 4571 1 0 1 1 0 8 0 vmmpekpl 168 24812 0 24792 2 0 2 2 0 8 0 vmmpepl 168 523878 0 519314 342 109 233 341 0 357 29 vmsppl 368 4586 0 4571 2 0 2 2 0 8 0 rwobjpl 56 90046 0 86149 56 0 56 56 0 8 0 pdppl 4096 9181 0 9142 64 23 41 45 0 8 2 pvpl 32 2269212 0 2174034 857 13 844 856 0 265 0 pmappl 232 4586 0 4571 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 398 0 32 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(ffffffff826e1ff0) 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(ffffffff82890758) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82890758) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff8000234b82b0,ffff80000006a400) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge17_untramp() at Xintr_ioapic_edge17_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3e kd_curproc sys/dev/kcov.c:571 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3e sys/dev/kcov.c:143 __mp_lock(ffffffff82890758) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82890758) at __mp_lock+0x133 sys/kern/kern_lock.c:147 upageflttrap(ffff8000234b8460,36d4229000) at upageflttrap+0x77 sys/arch/amd64/amd64/trap.c:180 usertrap(ffff8000234b8460) at usertrap+0x21a sys/arch/amd64/amd64/trap.c:406 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc4ff0, count: -11 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(fffffd806c74a918,9,0) at witness_checkorder+0x108b rw_enter(fffffd806c74a908,81) at rw_enter+0xd4 rrw_enter(fffffd806c74a908,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806031c0f8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806031c0f8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd807dde1768,0,ffff8000256da1c8,ffff8000256da198,0,2) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd807dde1768,0,ffff8000256da1c8,ffff8000256da198,0,2) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000256da330,ffff8000256da368,ffff8000256da2b0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd807f00a730,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000256da4c0,200007c0) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff8000256da4c0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000256da6f0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000256da6f0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3688ccff00, count: -15