login: witness: lock order reversal: 1st 0xfffffd806f147060 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80593af4e0 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(fffffd80593af4e0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80593af4e0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80593af4d0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80593af4d0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd804e8820f8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd804e8820f8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd804e9fa498,0,ffff8000256b3208,ffff8000256b31d8,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd804e9fa498,0,ffff8000256b3208,ffff8000256b31d8,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000256b3370,ffff8000256b33a8,ffff8000256b32f0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd800857e2e0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000256b3500,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000256b3500) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000256b3730) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000256b3730) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xff2b54af030, count: -15 ddb{1}> show registers rdi 0xffff800023498000 rsi 0x14094 mp_pdirpa+0x308e rbp 0xffff8000256b2e80 rbx 0x3 rdx 0xffff800023498000 rcx 0x14093 mp_pdirpa+0x308d rax 0xffffffff820c8577 db_enter+0x17 r8 0xffffffff819ef11c witness_checkorder+0x10cc r9 0x5 r10 0xfda82ec11e5a9fce r11 0xaf5e8e6f1bed48d1 r12 0xfffffd8002da77c0 r13 0 r14 0 r15 0 rip 0xffffffff820c8578 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000256b2e70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=204120 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff80002121f508,0xffff80002121f278 process=0xffff8000ffff8438 user=0xffff8000256ae000, vmspace=0xfffffd800857e2e0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 29907 39611 58989 32767 7 0x10 syz-executor.0 34898 307170 56279 32767 2 0x10 syz-executor.1 *34898 204120 56279 32767 7 0x4000010 syz-executor.1 46539 122760 0 0 3 0x14200 bored sosplice 56279 2659 16712 32767 3 0x90 nanoslp syz-executor.1 16712 424400 29745 0 3 0x82 wait syz-executor.1 58989 410567 8888 32767 2 0x10 syz-executor.0 8888 234415 29745 0 3 0x82 wait syz-executor.0 29745 294751 92159 0 3 0x82 thrsleep syz-fuzzer 29745 25941 92159 0 3 0x4000082 nanoslp syz-fuzzer 29745 128990 92159 0 3 0x4000082 nanoslp syz-fuzzer 29745 365875 92159 0 3 0x4000082 thrsleep syz-fuzzer 29745 98435 92159 0 3 0x4000082 thrsleep syz-fuzzer 29745 343762 92159 0 3 0x4000082 thrsleep syz-fuzzer 29745 207178 92159 0 3 0x4000082 thrsleep syz-fuzzer 29745 27041 92159 0 3 0x4000082 kqread syz-fuzzer 92159 193438 63298 0 3 0x10008a sigsusp ksh 63298 152094 33450 0 3 0x9a select sshd 97316 161400 1 0 3 0x100083 ttyin getty 33450 316755 1 0 3 0x88 select sshd 91680 123430 97060 73 3 0x100090 kqread syslogd 97060 412661 1 0 3 0x100082 netio syslogd 52727 53303 1 0 3 0x100080 kqread resolvd 98339 512028 46510 77 3 0x100092 kqread dhcpleased 75481 13732 46510 77 3 0x100092 kqread dhcpleased 46510 260314 1 0 3 0x80 kqread dhcpleased 39395 45686 0 0 3 0x14200 bored smr 46383 353198 0 0 2 0x14200 zerothread 58581 299213 0 0 3 0x14200 aiodoned aiodoned 11053 14936 0 0 3 0x14200 syncer update 82885 86440 0 0 3 0x14200 cleaner cleaner 27754 395169 0 0 3 0x14200 reaper reaper 82805 417023 0 0 3 0x14200 pgdaemon pagedaemon 14171 232295 0 0 3 0x14200 bored crynlk 66235 317288 0 0 3 0x14200 bored crypto 96011 445894 0 0 3 0x14200 bored viomb 29200 514869 0 0 3 0x40014200 acpi0 acpi0 2136 217905 0 0 3 0x40014200 idle1 20766 494654 0 0 3 0x14200 bored softnet 10852 479013 0 0 3 0x14200 bored systqmp 87591 147891 0 0 3 0x14200 bored systq 84464 29561 0 0 3 0x40014200 bored softclock 40095 394565 0 0 3 0x40014200 idle0 1 315820 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 29907 (syz-executor.0) thread 0xffff80002121f268 (39611) exclusive rwlock amaplk r = 0 (0xfffffd804d8975c8) #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 (0xfffffd800857e018) #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 34898 (syz-executor.1) thread 0xffff80002121e2a8 (204120) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828f8a20) #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 (0xfffffd806f147060) #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 6354K 6380K 78643K 11207 0 pcb 13 8K 8K 78643K 13 0 rtable 108 3K 3K 78643K 170 0 ifaddr 39 10K 10K 78643K 39 0 counters 44 34K 34K 78643K 44 0 ioctlops 0 0K 2K 78643K 55 0 iov 0 0K 12K 78643K 1004 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1216 76K 76K 78643K 1222 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 291 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 27708 0 sigio 0 0K 0K 78643K 2 0 proc 56 74K 99K 78643K 283 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 2 0K 0K 78643K 2 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 374 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 706 70K 70K 78643K 330997 0 UVM aobj 5 2K 2K 78643K 8 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 5 0K 0K 78643K 9 0 temp 101 4205K 4269K 78643K 57508 0 kqueue 10 14K 18K 78643K 34 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 21 0 18 1 0 1 1 0 8 0 rtentry 112 46 0 1 2 0 2 2 0 8 0 unpcb 120 21456 0 21439 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1326 0 1326 4 4 0 3 0 8 0 tcpcb 736 16 0 12 1 0 1 1 0 8 0 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 53 0 46 1 0 1 1 0 8 0 nd6 48 7 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 256 190 0 0 12 0 12 12 0 8 0 art_table 32 191 0 0 2 0 2 2 0 8 0 art_node 16 45 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 2 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 287 0 277 1 0 1 1 0 8 0 shmpl 112 5 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 35525 0 34121 88 0 88 88 0 8 0 ffsino 272 35525 0 34121 95 1 94 94 0 8 0 nchpl 144 72494 0 70880 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 160362 0 160362 2 1 1 1 0 8 1 percpumem 16 34 0 0 1 0 1 1 0 8 0 scxspl 216 190309 0 190309 10 9 1 8 0 8 1 plimitpl 152 20 0 10 1 0 1 1 0 8 0 sigapl 424 27931 0 27895 6 1 5 5 0 8 1 futexpl 56 177515 0 177515 1 0 1 1 0 8 1 knotepl 112 55 0 0 2 0 2 2 0 8 0 kqueuepl 216 32274 0 32258 4 2 2 2 0 8 0 pipepl 336 2097 0 2087 10 8 2 2 0 8 1 fdescpl 496 27914 0 27895 3 0 3 3 0 8 0 filepl 152 118396 0 118280 5 0 5 5 0 8 0 lockfpl 104 109 0 107 1 0 1 1 0 8 0 lockfspl 48 51 0 49 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 1654 0 1642 1 0 1 1 0 8 0 zombiepl 144 27895 0 27895 2 1 1 1 0 8 1 processpl 1072 27931 0 27895 3 0 3 3 0 8 0 procpl 672 57075 0 57031 14 9 5 5 0 8 1 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 480 21549 0 21522 11 7 4 5 0 8 0 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 19 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 22 0 0 3 1 2 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 664 0 0 80 4 76 80 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 951 0 0 44 1 43 43 0 8 0 bufpl 280 31043 0 24711 453 0 453 453 0 8 0 anonpl 24 6990243 0 6870885 733 12 721 722 0 186 0 amapchunkpl 152 772215 0 767960 171 6 165 165 0 158 1 amappl16 200 44139 0 40804 178 2 176 176 0 8 0 amappl15 192 13816 0 13814 1 0 1 1 0 8 0 amappl14 184 13869 0 13863 1 0 1 1 0 8 0 amappl13 176 33 0 30 1 0 1 1 0 8 0 amappl12 168 10 0 9 1 0 1 1 0 8 0 amappl11 160 44 0 32 1 0 1 1 0 8 0 amappl10 152 35 0 28 1 0 1 1 0 8 0 amappl9 144 240 0 236 1 0 1 1 0 8 0 amappl8 136 369 0 316 2 0 2 2 0 8 0 amappl7 128 71 0 56 1 0 1 1 0 8 0 amappl6 120 113 0 100 1 0 1 1 0 8 0 amappl5 112 27844 0 27823 1 0 1 1 0 8 0 amappl4 104 523 0 493 1 0 1 1 0 8 0 amappl3 96 221 0 218 1 0 1 1 0 8 0 amappl2 88 1747 0 1695 2 0 2 2 0 8 0 amappl1 80 474240 0 473795 13 3 10 12 0 8 0 amappl 88 325211 0 324582 16 1 15 15 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 7 0 3 1 0 1 1 0 8 0 uaddrrnd 24 27914 0 27895 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 27914 0 27895 1 0 1 1 0 8 0 vmmpekpl 168 136750 0 136725 2 0 2 2 0 8 0 vmmpepl 168 3124818 0 3119508 363 130 233 340 0 357 2 vmsppl 368 27913 0 27895 2 0 2 2 0 8 0 rwobjpl 56 511725 0 507179 68 3 65 65 0 8 0 pdppl 4096 55836 0 55790 76 30 46 50 0 8 0 pvpl 32 12949687 0 12826702 1020 24 996 998 0 265 2 pmappl 224 27913 0 27895 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 425 0 48 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(ffffffff827d2ff0) 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(ffffffff828f8818) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828f8818) 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 __mp_lock(ffffffff828f8818) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828f8818) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd800857e000,b1d8773a000,0,2) at uvm_fault+0x224 sys/uvm/uvm_fault.c:637 upageflttrap(ffff8000256b9890,b1d8773a77a) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff8000256b9890) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffec140, 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:399 witness_checkorder(fffffd80593af4e0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80593af4e0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80593af4d0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80593af4d0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd804e8820f8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd804e8820f8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd804e9fa498,0,ffff8000256b3208,ffff8000256b31d8,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd804e9fa498,0,ffff8000256b3208,ffff8000256b31d8,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000256b3370,ffff8000256b33a8,ffff8000256b32f0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd800857e2e0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff8000256b3500,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000256b3500) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000256b3730) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000256b3730) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xff2b54af030, count: -15