witness: lock order reversal: 1st 0xfffffd806f35c440 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806426bb40 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:440 witness_checkorder(fffffd806426bb40,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806426bb40,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd806426bb30,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd806426bb30,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8069754d38,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8069754d38,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd80689cd210,0,ffff800021284c08,ffff800021284bd8,0,0,b632065bbac77fa2,ffffffff82285a20) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd80689cd210,0,ffff800021284c08,ffff800021284bd8,0,0,b632065bbac77fa2,ffffffff82285a20) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800021284d70,ffff800021284da8,ffff800021284cf0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd80085968a0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800021284f00,20000080) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800021284f00) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800021285130) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021285130) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb7eeb6b7940, count: -15 ddb{1}> show registers rdi 0xffff800021294000 rsi 0x6f26 __ALIGN_SIZE+0x5f26 rbp 0xffff800021284880 rbx 0x3 rdx 0xffff800021294000 rcx 0x6f25 __ALIGN_SIZE+0x5f25 rax 0xffffffff8137d697 db_enter+0x17 r8 0xffffffff822993fc witness_checkorder+0x10cc r9 0x5 r10 0x61e37b93ed7f0261 r11 0xd3abb4072820bfa8 r12 0xfffffd8002dc0880 r13 0 r14 0 r15 0 rip 0xffffffff8137d698 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021284870 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=275397 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002124a7e0,0xffff80002124a550 process=0xffff8000ffff8008 user=0xffff800021280000, vmspace=0xfffffd80085968a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51060 111108 42960 32767 7 0x10 syz-executor.1 54940 216726 78291 32767 2 0x10 syz-executor.0 *54940 275397 78291 32767 7 0x4000010 syz-executor.0 42960 398349 74510 32767 3 0x90 nanoslp syz-executor.1 74510 239614 29825 0 3 0x82 wait syz-executor.1 8978 144870 0 0 3 0x14200 bored sosplice 78291 368959 99186 32767 3 0x90 nanoslp syz-executor.0 99186 447072 29825 0 3 0x82 wait syz-executor.0 29825 161560 11309 0 3 0x82 thrsleep syz-fuzzer 29825 261329 11309 0 3 0x4000082 nanoslp syz-fuzzer 29825 388689 11309 0 3 0x4000082 thrsleep syz-fuzzer 29825 91146 11309 0 3 0x4000082 thrsleep syz-fuzzer 29825 329616 11309 0 3 0x4000082 nanoslp syz-fuzzer 29825 12886 11309 0 3 0x4000082 kqread syz-fuzzer 29825 467075 11309 0 3 0x4000082 thrsleep syz-fuzzer 29825 257921 11309 0 3 0x4000082 thrsleep syz-fuzzer 11309 338125 3882 0 3 0x10008a sigsusp ksh 3882 275966 97362 0 3 0x9a select sshd 28744 325278 1 0 3 0x100083 ttyin getty 97362 199855 1 0 3 0x88 select sshd 83837 438949 65746 73 3 0x100090 kqread syslogd 65746 221311 1 0 3 0x100082 netio syslogd 61471 474655 1 0 3 0x100080 kqread resolvd 98759 433433 75763 77 3 0x100092 kqread dhcpleased 5594 358105 75763 77 3 0x100092 kqread dhcpleased 75763 383796 1 0 3 0x80 kqread dhcpleased 11944 260076 0 0 3 0x14200 bored smr 39761 68318 0 0 2 0x14200 zerothread 85501 60269 0 0 3 0x14200 aiodoned aiodoned 63155 253203 0 0 3 0x14200 syncer update 65392 327830 0 0 3 0x14200 cleaner cleaner 86896 40084 0 0 3 0x14200 reaper reaper 52249 236280 0 0 3 0x14200 pgdaemon pagedaemon 92507 206600 0 0 3 0x14200 bored crynlk 87655 317053 0 0 3 0x14200 bored crypto 8748 143005 0 0 3 0x14200 bored viomb 52076 138039 0 0 3 0x40014200 acpi0 acpi0 35865 122129 0 0 3 0x40014200 idle1 66761 492299 0 0 3 0x14200 bored softnet 64200 444256 0 0 3 0x14200 bored systqmp 26212 374141 0 0 3 0x14200 bored systq 13919 288703 0 0 3 0x40014200 bored softclock 36806 177684 0 0 3 0x40014200 idle0 1 70673 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 51060 (syz-executor.1) thread 0xffff80002124a540 (111108) exclusive rwlock amaplk r = 0 (0xfffffd8063ea0e18) #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 (0xfffffd8008596748) #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 54940 (syz-executor.0) thread 0xffff80002124b500 (275397) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829164d0) #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 (0xfffffd806f35c440) #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+0x20f #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 10117 6407K 6433K 78643K 11213 0 pcb 13 8K 8K 78643K 13 0 rtable 112 3K 3K 78643K 379 0 ifaddr 39 10K 10K 78643K 53 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 48 0 ioctlops 0 0K 2K 78643K 164 0 iov 0 0K 24K 78643K 241 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1216 76K 77K 78643K 1419 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 29 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 3347 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 26945 0 sigio 0 0K 0K 78643K 61 0 proc 56 74K 99K 78643K 547 0 subproc 34 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 414 0 in_multi 33 2K 2K 78643K 156 0 ether_multi 1 0K 0K 78643K 23 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 936 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 375 50K 55K 78643K 324921 0 UVM aobj 48 2K 4K 78643K 119 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 128 0 NDP 5 0K 0K 78643K 15 0 temp 102 4213K 4277K 78643K 56479 0 kqueue 10 14K 19K 78643K 407 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 120 213 0 210 1 0 1 1 0 8 0 rtentry 112 72 0 25 2 0 2 2 0 8 0 unpcb 120 5662 0 5629 2 0 2 2 0 8 0 syncache 296 67 0 67 8 8 0 1 0 8 0 tcpqe 32 285 0 285 11 11 0 1 0 8 0 tcpcb 736 2104 0 2100 25 23 2 7 0 8 1 arp 120 10 0 4 1 0 1 1 0 8 0 inpcb 304 3088 0 3081 11 10 1 3 0 8 0 ip6q 72 4 0 4 2 2 0 1 0 8 0 ip6af 40 7 0 7 2 2 0 1 0 8 0 nd6 48 17 0 8 1 0 1 1 0 8 0 kcovpl 48 4 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 317 0 93 15 1 14 15 0 8 0 art_table 32 318 0 93 2 0 2 2 0 8 0 art_node 16 71 0 28 1 0 1 1 0 8 0 sysvmsgpl 40 36 0 35 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 3345 0 3335 1 0 1 1 0 8 0 shmpl 112 116 0 71 4 2 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 29459 0 28044 90 1 89 89 0 8 0 ffsino 272 29459 0 28044 95 0 95 95 0 8 0 nchpl 144 64967 0 63365 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 133827 0 133827 1 0 1 1 0 8 1 percpumem 16 36 0 2 1 0 1 1 0 8 0 scxspl 216 173064 0 173064 11 10 1 8 0 8 1 plimitpl 152 156 0 146 1 0 1 1 0 8 0 sigapl 424 27162 0 27126 6 1 5 5 0 8 0 futexpl 56 227680 0 227680 1 0 1 1 0 8 1 knotepl 112 56 0 0 2 0 2 2 0 8 0 kqueuepl 216 46192 0 46168 9 7 2 2 0 8 0 pipepl 336 1233 0 1223 24 22 2 2 0 8 1 fdescpl 496 27145 0 27126 3 0 3 3 0 8 0 filepl 152 100905 0 100788 12 7 5 7 0 8 0 lockfpl 104 1339 0 1336 1 0 1 1 0 8 0 lockfspl 48 551 0 548 1 0 1 1 0 8 0 sessionpl 144 19 0 9 1 0 1 1 0 8 0 pgrppl 48 843 0 833 1 0 1 1 0 8 0 ucredpl 96 2848 0 2836 1 0 1 1 0 8 0 zombiepl 144 27126 0 27126 1 0 1 1 0 8 1 processpl 1072 27162 0 27126 3 0 3 3 0 8 0 procpl 672 57624 0 57580 20 16 4 5 0 8 0 sosppl 168 69 0 69 6 6 0 1 0 8 0 sockpl 480 9050 0 9007 15 9 6 8 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 33 0 0 4 2 2 3 0 8 0 mcl12k 12288 44 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 17 0 0 2 0 2 2 0 8 0 mcl2k 2048 916 0 0 32 0 32 32 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1367 0 0 61 5 56 60 0 8 0 bufpl 280 39468 0 33136 453 0 453 453 0 8 0 anonpl 24 6903582 0 6876505 308 142 166 166 0 186 2 amapchunkpl 152 758939 0 757949 68 28 40 44 0 158 1 amappl16 200 48319 0 47502 133 89 44 47 0 8 0 amappl15 192 21 0 19 1 0 1 1 0 8 0 amappl14 184 1631 0 1630 1 0 1 1 0 8 0 amappl13 176 157 0 155 1 0 1 1 0 8 0 amappl12 168 11632 0 11625 1 0 1 1 0 8 0 amappl11 160 46 0 34 1 0 1 1 0 8 0 amappl10 152 13687 0 13679 1 0 1 1 0 8 0 amappl9 144 346 0 343 1 0 1 1 0 8 0 amappl8 136 624 0 490 5 0 5 5 0 8 0 amappl7 128 75 0 61 1 0 1 1 0 8 0 amappl6 120 128 0 112 1 0 1 1 0 8 0 amappl5 112 40867 0 40846 1 0 1 1 0 8 0 amappl4 104 799 0 766 1 0 1 1 0 8 0 amappl3 96 12446 0 12442 1 0 1 1 0 8 0 amappl2 88 789 0 734 2 0 2 2 0 8 0 amappl1 80 455180 0 454742 12 2 10 12 0 8 0 amappl 88 319353 0 319134 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 64 118 0 71 1 0 1 1 0 8 0 uaddrrnd 24 27145 0 27126 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 27145 0 27126 1 0 1 1 0 8 0 vmmpekpl 168 152288 0 152266 2 0 2 2 0 8 0 vmmpepl 168 3073758 0 3071276 190 80 110 110 0 357 1 vmsppl 368 27144 0 27126 2 0 2 2 0 8 0 rwobjpl 56 513050 0 511362 50 25 25 25 0 8 1 pdppl 4096 54298 0 54252 64 18 46 50 0 8 0 pvpl 32 15845321 0 15814469 477 221 256 256 0 265 6 pmappl 224 27144 0 27126 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 429 0 74 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(ffffffff827e1ff0) 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(ffffffff829162c8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829162c8) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x37 kd_curproc sys/dev/kcov.c:570 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x37 sys/dev/kcov.c:143 __mp_lock(ffffffff829162c8) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829162c8) at __mp_lock+0x133 sys/kern/kern_lock.c:147 uvm_fault(fffffd8008596730,f15a06e1000,0,2) at uvm_fault+0x224 sys/uvm/uvm_fault.c:637 upageflttrap(ffff8000256b51c0,f15a06e156a) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000256b51c0) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffe59b0, count: -12 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:440 witness_checkorder(fffffd806426bb40,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806426bb40,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd806426bb30,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd806426bb30,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8069754d38,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8069754d38,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd80689cd210,0,ffff800021284c08,ffff800021284bd8,0,0,b632065bbac77fa2,ffffffff82285a20) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd80689cd210,0,ffff800021284c08,ffff800021284bd8,0,0,b632065bbac77fa2,ffffffff82285a20) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff800021284d70,ffff800021284da8,ffff800021284cf0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd80085968a0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800021284f00,20000080) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800021284f00) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff800021285130) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021285130) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb7eeb6b7940, count: -15