witness: lock order reversal: 1st 0xfffffd806f766440 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80574b52c0 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(fffffd80574b52c0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80574b52c0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80574b52b0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80574b52b0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd804e9e61d8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd804e9e61d8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd804f765570,0,ffff800023497188,ffff800023497158,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd804f765570,0,ffff800023497188,ffff800023497158,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000234972f0,ffff800023497328,ffff800023497270,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd80085825c0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800023497480,200000c0) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800023497480) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000234976b0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000234976b0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x539851d8140, count: -15 ddb{1}> show registers rdi 0xffff800021292000 rsi 0x14528 acpi_pdirpa+0x390 rbp 0xffff800023496e00 rbx 0x3 rdx 0xffff800021292000 rcx 0x14527 acpi_pdirpa+0x38f rax 0xffffffff8143b2a7 db_enter+0x17 r8 0xffffffff81222ddc witness_checkorder+0x10cc r9 0x5 r10 0xe321fb9cda8cbd9d r11 0x8cd7c8242270725c r12 0xfffffd8002dab7c0 r13 0 r14 0 r15 0 rip 0xffffffff8143b2a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023496df0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=440052 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021211268,0xffffffff8295b308 process=0xffff8000ffff8438 user=0xffff800023492000, vmspace=0xfffffd80085825c0 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 33578 418897 97259 32767 7 0x10 syz-executor.0 *33578 440052 97259 32767 7 0x4000010 syz-executor.0 40592 414881 56268 32767 3 0x10 biowait syz-executor.1 97259 512905 99509 32767 3 0x90 nanoslp syz-executor.0 56268 821 81634 0 3 0x82 wait syz-executor.1 99509 267201 81634 0 3 0x82 wait syz-executor.0 81634 125160 76691 0 3 0x82 thrsleep syz-fuzzer 81634 221703 76691 0 3 0x4000082 nanoslp syz-fuzzer 81634 26021 76691 0 3 0x4000082 kqread syz-fuzzer 81634 213653 76691 0 3 0x4000082 thrsleep syz-fuzzer 81634 83379 76691 0 3 0x4000082 nanoslp syz-fuzzer 81634 382417 76691 0 3 0x4000082 thrsleep syz-fuzzer 81634 190610 76691 0 3 0x4000082 thrsleep syz-fuzzer 81634 32087 76691 0 3 0x4000082 thrsleep syz-fuzzer 76691 99790 13846 0 3 0x10008a sigsusp ksh 13846 326949 65679 0 3 0x9a select sshd 32093 58308 1 0 3 0x100083 ttyin getty 65679 206017 1 0 3 0x88 select sshd 49874 94893 72818 73 3 0x100090 kqread syslogd 72818 500626 1 0 3 0x100082 netio syslogd 76894 183002 1 0 3 0x100080 kqread resolvd 18240 465281 26764 77 3 0x100092 kqread dhcpleased 99945 242226 26764 77 3 0x100092 kqread dhcpleased 26764 37518 1 0 3 0x80 kqread dhcpleased 34913 6187 0 0 3 0x14200 bored smr 47185 449283 0 0 3 0x14200 pgzero zerothread 1614 470843 0 0 3 0x14200 aiodoned aiodoned 94645 377789 0 0 3 0x14200 syncer update 64138 385354 0 0 3 0x14200 cleaner cleaner 57064 57002 0 0 3 0x14200 reaper reaper 65465 490675 0 0 3 0x14200 pgdaemon pagedaemon 82218 281134 0 0 3 0x14200 bored crynlk 53204 294443 0 0 3 0x14200 bored crypto 53465 283659 0 0 3 0x14200 bored viomb 7597 100760 0 0 3 0x40014200 acpi0 acpi0 16256 81169 0 0 3 0x40014200 idle1 75425 452836 0 0 3 0x14200 bored softnet 91686 44994 0 0 3 0x14200 bored systqmp 7079 116039 0 0 3 0x14200 bored systq 11771 355673 0 0 3 0x40014200 bored softclock 91535 380970 0 0 3 0x40014200 idle0 1 254261 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 33578 (syz-executor.0) thread 0xffff800021210fc8 (440052) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829423a8) #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 (0xfffffd806f766440) #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 Process 40592 (syz-executor.1) thread 0xffff8000212107e8 (414881) exclusive rrwlock inode r = 0 (0xfffffd80574b51b0) #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+0x3e2 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b 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+0x1eb sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1321 #8 ufs_lookup+0x145f sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:88 #10 vfs_lookup+0x737 sys/kern/vfs_lookup.c:561 #11 namei+0x55a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1854 #13 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80574b5a30) #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+0x3e2 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b 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+0xdd sys/kern/vfs_lookup.c:413 #6 namei+0x55a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1854 #8 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10116 6354K 6380K 78643K 11206 0 pcb 13 8K 8K 78643K 13 0 rtable 106 3K 3K 78643K 168 0 ifaddr 39 10K 10K 78643K 39 0 counters 44 34K 34K 78643K 44 0 ioctlops 0 0K 2K 78643K 58 0 iov 0 0K 0K 78643K 5001 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 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 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 9 1K 1K 78643K 190 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 7 21K 33K 78643K 40154 0 proc 56 74K 99K 78643K 282 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 7 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 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 379 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 670 69K 69K 78643K 474585 0 UVM aobj 27 2K 2K 78643K 27 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 6 0 NDP 5 0K 0K 78643K 9 0 temp 101 4205K 4269K 78643K 82393 0 kqueue 10 14K 19K 78643K 711 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 45 0 1 2 0 2 2 0 8 0 unpcb 120 635 0 620 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 205 0 205 3 3 0 1 0 8 0 tcpcb 736 30 0 26 1 0 1 1 0 8 0 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 76 0 69 1 0 1 1 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 sysvmsgpl 40 12 0 9 1 0 1 1 0 8 0 semupl 112 110 0 110 1 1 0 1 0 8 0 semapl 112 142 0 135 1 0 1 1 0 8 0 shmpl 112 24 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 44222 0 42818 88 0 88 88 0 8 0 ffsino 272 44222 0 42818 95 1 94 94 0 8 0 nchpl 144 88348 0 86735 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 183104 0 183104 2 1 1 1 0 8 1 percpumem 16 34 0 0 1 0 1 1 0 8 0 scxspl 216 253807 0 253806 11 10 1 8 0 8 0 plimitpl 152 20 0 10 1 0 1 1 0 8 0 sigapl 424 40376 0 40342 5 1 4 5 0 8 0 futexpl 56 247605 0 247605 1 0 1 1 0 8 1 knotepl 112 55 0 0 2 0 2 2 0 8 0 kqueuepl 216 67724 0 67717 7 6 1 2 0 8 0 pipepl 336 1144 0 1134 11 10 1 2 0 8 0 fdescpl 496 40360 0 40342 3 0 3 3 0 8 0 filepl 152 123024 0 122911 5 0 5 5 0 8 0 lockfpl 104 158 0 155 1 0 1 1 0 8 0 lockfspl 48 41 0 38 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 96 763 0 751 1 0 1 1 0 8 0 zombiepl 144 40342 0 40342 2 1 1 1 0 8 1 processpl 1072 40376 0 40342 3 0 3 3 0 8 0 procpl 672 82503 0 82461 12 8 4 5 0 8 0 sockpl 480 1135 0 1110 20 16 4 4 0 8 0 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 19 0 0 3 0 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 14 0 0 1 0 1 1 0 8 0 mcl8k 8192 15 0 0 2 0 2 2 0 8 0 mcl4k 4096 33 0 0 4 1 3 3 0 8 0 mcl2k2 2112 14 0 0 1 0 1 1 0 8 0 mcl2k 2048 616 0 0 56 39 17 56 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 900 0 0 32 2 30 31 0 8 0 bufpl 280 43485 0 37153 453 0 453 453 0 8 0 anonpl 24 10040418 0 9935891 699 3 696 698 0 186 0 amapchunkpl 152 1114532 0 1110521 162 3 159 161 0 158 0 amappl16 200 58253 0 55007 171 0 171 171 0 8 0 amappl15 192 2 0 1 2 1 1 1 0 8 0 amappl14 184 2 0 1 1 0 1 1 0 8 0 amappl13 176 28 0 26 1 0 1 1 0 8 0 amappl12 168 7 0 5 1 0 1 1 0 8 0 amappl11 160 44 0 32 1 0 1 1 0 8 0 amappl10 152 20126 0 20120 1 0 1 1 0 8 0 amappl9 144 20232 0 20227 1 0 1 1 0 8 0 amappl8 136 361 0 313 2 0 2 2 0 8 0 amappl7 128 68 0 53 1 0 1 1 0 8 0 amappl6 120 20151 0 20134 1 0 1 1 0 8 0 amappl5 112 60520 0 60499 1 0 1 1 0 8 0 amappl4 104 2537 0 2507 1 0 1 1 0 8 0 amappl3 96 4589 0 4586 1 0 1 1 0 8 0 amappl2 88 500 0 448 2 0 2 2 0 8 0 amappl1 80 660006 0 659569 13 3 10 12 0 8 0 amappl 88 470240 0 469644 14 0 14 14 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 26 0 0 1 0 1 1 0 8 0 uaddrrnd 24 40360 0 40342 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 40360 0 40342 1 0 1 1 0 8 0 vmmpekpl 168 142921 0 142899 2 0 2 2 0 8 0 vmmpepl 168 4558827 0 4553717 368 140 228 358 0 357 2 vmsppl 368 40359 0 40342 2 0 2 2 0 8 0 rwobjpl 56 734304 0 729880 65 2 63 63 0 8 0 pdppl 4096 80727 0 80684 71 26 45 49 0 8 2 pvpl 32 19608740 0 19500684 968 9 959 965 0 265 0 pmappl 224 40359 0 40342 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 387 0 82 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82807ff0) 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+0x17 kd_curproc sys/dev/kcov.c:559 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x17 sys/dev/kcov.c:143 __mp_lock(ffffffff829421a0) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829421a0) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff8000256b9160,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: 0x7f7ffffd5180, count: -7 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(fffffd80574b52c0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80574b52c0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80574b52b0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80574b52b0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd804e9e61d8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd804e9e61d8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd804f765570,0,ffff800023497188,ffff800023497158,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd804f765570,0,ffff800023497188,ffff800023497158,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff8000234972f0,ffff800023497328,ffff800023497270,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd80085825c0,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff800023497480,200000c0) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff800023497480) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff8000234976b0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000234976b0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x539851d8140, count: -15