witness: lock order reversal: 1st 0xfffffd807f7d5058 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80645c0700 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(fffffd80645c0700,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80645c0700,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80645c06f0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80645c06f0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8066ce8230,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8066ce8230,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8065c25ca8,0,ffff80002569efc8,ffff80002569ef98,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8065c25ca8,0,ffff80002569efc8,ffff80002569ef98,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff80002569f130,ffff80002569f168,ffff80002569f0b0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd8008582000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff80002569f2c0,20000180) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002569f2c0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002569f500) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002569f500) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8a66f921e50, count: -15 ddb{1}> show registers rdi 0xffff800021284000 rsi 0x14c46 acpi_pdirpa+0xaae rbp 0xffff80002569ec40 rbx 0x3 rdx 0xffff800021284000 rcx 0x14c45 acpi_pdirpa+0xaad rax 0xffffffff81fcd337 db_enter+0x17 r8 0xffffffff81fed1fc witness_checkorder+0x10cc r9 0x5 r10 0x504b17326ffed76d r11 0xeec13d9af3832c8e r12 0xfffffd8002dab7c0 r13 0 r14 0 r15 0 rip 0xffffffff81fcd338 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002569ec30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=472986 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff800021211260,0xffffffff82882390 process=0xffff8000ffff8868 user=0xffff80002569a000, vmspace=0xfffffd8008582000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82239 322997 29375 32767 7 0x10 syz-executor.1 *82239 472986 29375 32767 7 0x4000010 syz-executor.1 29375 414655 77175 32767 3 0x90 nanoslp syz-executor.1 77175 345012 64276 0 3 0x82 wait syz-executor.1 56102 183020 58633 32767 3 0x90 nanoslp syz-executor.0 58633 59968 64276 0 3 0x82 wait syz-executor.0 14069 50636 0 0 3 0x14200 bored sosplice 64276 250014 3119 0 3 0x82 thrsleep syz-fuzzer 64276 181789 3119 0 3 0x4000082 nanoslp syz-fuzzer 64276 295125 3119 0 3 0x4000082 thrsleep syz-fuzzer 64276 58806 3119 0 3 0x4000082 thrsleep syz-fuzzer 64276 20401 3119 0 3 0x4000082 thrsleep syz-fuzzer 64276 396918 3119 0 3 0x4000082 thrsleep syz-fuzzer 64276 404178 3119 0 3 0x4000082 thrsleep syz-fuzzer 64276 180946 3119 0 3 0x4000082 kqread syz-fuzzer 3119 215641 43214 0 3 0x10008a sigsusp ksh 43214 104929 47185 0 3 0x9a select sshd 16710 413138 1 0 3 0x100083 ttyin getty 47185 339653 1 0 3 0x88 select sshd 15247 89353 45313 73 3 0x100090 kqread syslogd 45313 381181 1 0 3 0x100082 netio syslogd 64030 99677 1 0 3 0x100080 kqread resolvd 94346 307921 22052 77 3 0x100092 kqread dhcpleased 27816 199050 22052 77 3 0x100092 kqread dhcpleased 22052 491044 1 0 3 0x80 kqread dhcpleased 77970 51943 0 0 3 0x14200 bored smr 19001 223496 0 0 3 0x14200 pgzero zerothread 84160 100768 0 0 3 0x14200 aiodoned aiodoned 68347 359550 0 0 3 0x14200 syncer update 4436 467125 0 0 3 0x14200 cleaner cleaner 63886 373093 0 0 3 0x14200 reaper reaper 23240 458449 0 0 3 0x14200 pgdaemon pagedaemon 88533 295041 0 0 3 0x14200 bored crynlk 34726 233685 0 0 3 0x14200 bored crypto 45425 115475 0 0 3 0x14200 bored viomb 24350 333196 0 0 3 0x40014200 acpi0 acpi0 78323 95972 0 0 3 0x40014200 idle1 14623 51832 0 0 3 0x14200 bored softnet 80350 511150 0 0 3 0x14200 bored systqmp 81164 415386 0 0 3 0x14200 bored systq 82631 210618 0 0 3 0x40014200 bored softclock 94750 403397 0 0 3 0x40014200 idle0 1 101715 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 82239 (syz-executor.1) thread 0xffff8000212107e0 (472986) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828e3a18) #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 (0xfffffd807f7d5058) #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 10117 6354K 6380K 78643K 11234 0 pcb 13 8K 8K 78643K 13 0 rtable 108 3K 3K 78643K 713 0 ifaddr 39 10K 10K 78643K 105 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 62 0 ioctlops 0 0K 2K 78643K 120 0 iov 0 0K 16K 78643K 257 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1216 76K 77K 78643K 1611 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 29 0 VM map 2 1K 1K 78643K 2 0 sem 10 1K 1K 78643K 12 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 18212 0 sigio 0 0K 0K 78643K 35 0 proc 56 74K 99K 78643K 681 0 subproc 34 2K 2K 78643K 187 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 661 0 in_multi 33 2K 2K 78643K 260 0 ether_multi 1 0K 0K 78643K 20 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 8330 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 420 43K 64K 78643K 219160 0 UVM aobj 83 3K 3K 78643K 121 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 231 0 NDP 5 0K 0K 78643K 36 0 temp 101 4205K 4285K 78643K 39891 0 kqueue 10 14K 20K 78643K 322 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 120 368 0 365 1 0 1 1 0 8 0 rtentry 112 149 0 104 2 0 2 2 0 8 0 unpcb 120 2084 0 2065 1 0 1 1 0 8 0 syncache 296 83 0 83 13 13 0 1 0 8 0 tcpqe 32 394 0 394 16 15 1 1 0 8 1 tcpcb 736 1353 0 1349 31 30 1 7 0 8 0 arp 120 24 0 18 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 2 0 2 1 1 0 1 0 8 0 inpcb 304 3031 0 3024 10 9 1 2 0 8 0 ip6q 72 6 0 6 2 2 0 1 0 8 0 ip6af 40 10 0 10 2 2 0 1 0 8 0 nd6 48 38 0 31 1 0 1 1 0 8 0 kcovpl 48 11 0 9 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 642 0 451 15 3 12 15 0 8 0 art_table 32 643 0 451 2 0 2 2 0 8 0 art_node 16 148 0 107 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 shmpl 112 118 0 38 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 20851 0 19439 90 1 89 89 0 8 0 ffsino 272 20851 0 19439 95 0 95 95 0 8 0 nchpl 144 56600 0 54999 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 100395 0 100395 1 0 1 1 0 8 1 percpumem 16 43 0 9 1 0 1 1 0 8 0 scxspl 216 120173 0 120172 13 12 1 5 0 8 0 plimitpl 152 188 0 178 1 0 1 1 0 8 0 sigapl 424 18408 0 18373 6 1 5 5 0 8 1 futexpl 56 203848 0 203848 1 0 1 1 0 8 1 knotepl 112 58 0 0 2 0 2 2 0 8 0 kqueuepl 216 21468 0 21461 8 7 1 2 0 8 0 pipepl 336 1339 0 1328 12 10 2 2 0 8 1 fdescpl 496 18391 0 18373 3 0 3 3 0 8 0 filepl 152 58170 0 58058 6 1 5 6 0 8 0 lockfpl 104 1172 0 1168 1 0 1 1 0 8 0 lockfspl 48 419 0 415 1 0 1 1 0 8 0 sessionpl 144 26 0 16 1 0 1 1 0 8 0 pgrppl 48 87 0 77 1 0 1 1 0 8 0 ucredpl 96 3241 0 3229 1 0 1 1 0 8 0 zombiepl 144 18373 0 18372 1 0 1 1 0 8 0 processpl 1072 18408 0 18372 3 0 3 3 0 8 0 procpl 672 39081 0 39037 14 9 5 5 0 8 1 srpgc 96 1 0 1 1 1 0 1 0 8 0 sosppl 168 128 0 128 8 8 0 1 0 8 0 sockpl 480 5547 0 5518 12 7 5 6 0 8 0 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 23 0 0 3 1 2 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 9 0 0 1 0 1 1 0 8 0 mcl8k 8192 25 0 0 4 2 2 3 0 8 0 mcl4k 4096 26 0 0 4 1 3 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 485 0 0 25 0 25 25 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1114 0 0 59 0 59 59 0 8 0 bufpl 280 23121 0 16789 453 0 453 453 0 8 0 anonpl 24 4620175 0 4593168 205 39 166 166 0 186 1 amapchunkpl 152 516118 0 515242 55 19 36 46 0 158 1 amappl16 200 27462 0 26539 68 19 49 49 0 8 0 amappl15 192 48 0 47 1 0 1 1 0 8 0 amappl14 184 7078 0 7074 1 0 1 1 0 8 0 amappl13 176 7481 0 7479 1 0 1 1 0 8 0 amappl12 168 3578 0 3575 1 0 1 1 0 8 0 amappl11 160 112 0 101 1 0 1 1 0 8 0 amappl10 152 56 0 49 1 0 1 1 0 8 0 amappl9 144 217 0 214 1 0 1 1 0 8 0 amappl8 136 842 0 673 6 0 6 6 0 8 0 amappl7 128 107 0 93 1 0 1 1 0 8 0 amappl6 120 205 0 182 1 0 1 1 0 8 0 amappl5 112 9462 0 9447 1 0 1 1 0 8 0 amappl4 104 6401 0 6363 2 0 2 2 0 8 0 amappl3 96 4416 0 4414 1 0 1 1 0 8 0 amappl2 88 11711 0 11653 2 0 2 2 0 8 0 amappl1 80 317917 0 317484 12 2 10 12 0 8 0 amappl 88 215525 0 215300 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 64 120 0 38 2 0 2 2 0 8 0 uaddrrnd 24 18391 0 18373 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 18391 0 18373 1 0 1 1 0 8 0 vmmpekpl 168 91796 0 91774 2 0 2 2 0 8 0 vmmpepl 168 2101053 0 2098509 180 64 116 136 0 357 2 vmsppl 368 18390 0 18373 2 0 2 2 0 8 0 rwobjpl 56 345414 0 343585 36 9 27 27 0 8 1 pdppl 4096 36790 0 36746 72 26 46 50 0 8 2 pvpl 32 10620112 0 10589197 369 113 256 256 0 265 6 pmappl 224 18390 0 18373 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 423 0 76 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(ffffffff82762ff0) 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 __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(ffffffff828e3810) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828e3810) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff800025699110,ffff80000006a400) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge17_untramp() at Xintr_ioapic_edge17_untramp+0x18f __mp_lock(ffffffff828e3810) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828e3810) at __mp_lock+0x129 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: 0x7f7ffffcfbb0, count: -10 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(fffffd80645c0700,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80645c0700,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80645c06f0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80645c06f0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8066ce8230,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8066ce8230,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd8065c25ca8,0,ffff80002569efc8,ffff80002569ef98,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd8065c25ca8,0,ffff80002569efc8,ffff80002569ef98,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff80002569f130,ffff80002569f168,ffff80002569f0b0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd8008582000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff80002569f2c0,20000180) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002569f2c0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002569f500) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002569f500) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8a66f921e50, count: -15