witness: lock order reversal: 1st 0xfffffd807b03cc08 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80678a3b40 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd80678a3b40,9,0) at witness_checkorder+0x108b rw_enter(fffffd80678a3b30,1) at rw_enter+0xd4 rrw_enter(fffffd80678a3b30,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8066434d88,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8066434d88,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8066434d88,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800021286550,fffffd8066434d88,fffffd807f7d8900,ffff8000242c3900,ffff8000242c38e0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021286550,ffffffff823b6199,ffff8000242c39e8,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021286550,ffffffff823b6199,ffff8000242c39e8,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800021286550,ffff8000242c3a58,ffff8000242c3aa0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000242c3b20) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000242c3b20) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17defd76580, count: -12 ddb{0}> show registers rdi 0xffff8000212be000 rsi 0x1440c acpi_pdirpa+0x274 rbp 0xffff8000242c3510 rbx 0x3 rdx 0xffff8000212be000 rcx 0x1440b acpi_pdirpa+0x273 rax 0xffffffff814877b7 db_enter+0x17 r8 0xffffffff81ee1d21 witness_checkorder+0x1061 r9 0x5 r10 0x77fe93b82f9e7c7 r11 0x136b30383924b83b r12 0 r13 0xfffffd80678a3b40 r14 0 r15 0xfffffd8002cf46c0 rip 0xffffffff814877b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000242c3500 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=1046 stat=onproc flags process=0 proc=4000001 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021287510,0xffffffff827b1370 process=0xffff800024330888 user=0xffff8000242be000, vmspace=0xfffffd80084d2b80 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 84512 321552 33961 0 7 0 syz-executor.0 *84512 1046 33961 0 7 0x4000001 syz-executor.0 25451 68083 0 0 3 0x14200 bored sosplice 87547 1848 0 0 3 0x14280 nfsidl nfsio 58990 252136 0 0 3 0x14280 nfsidl nfsio 52807 292252 0 0 3 0x14280 nfsidl nfsio 5675 503579 0 0 3 0x14280 nfsidl nfsio 86694 502942 0 0 3 0x14280 nfsidl nfsio 26794 438428 0 0 3 0x14280 nfsidl nfsio 44856 1866 0 0 3 0x14280 nfsidl nfsio 36225 135507 0 0 3 0x14280 nfsidl nfsio 92013 433853 0 0 3 0x14280 nfsidl nfsio 41314 367978 0 0 3 0x14280 nfsidl nfsio 5528 6274 0 0 3 0x14280 nfsidl nfsio 32142 359505 0 0 3 0x14280 nfsidl nfsio 60743 121156 0 0 3 0x14280 nfsidl nfsio 93567 260231 0 0 3 0x14280 nfsidl nfsio 88612 504320 0 0 3 0x14280 nfsidl nfsio 73680 286112 0 0 3 0x14280 nfsidl nfsio 73441 515400 0 0 3 0x14280 nfsidl nfsio 69868 150333 0 0 3 0x14280 nfsidl nfsio 90405 55617 0 0 3 0x14280 nfsidl nfsio 77495 323127 0 0 3 0x14280 nfsidl nfsio 26197 160655 64436 0 3 0x82 nanoslp syz-executor.1 33961 488454 64436 0 3 0x82 nanoslp syz-executor.0 64436 133268 17782 0 3 0x82 thrsleep syz-fuzzer 64436 84816 17782 0 3 0x4000082 thrsleep syz-fuzzer 64436 500886 17782 0 3 0x4000082 thrsleep syz-fuzzer 64436 436976 17782 0 3 0x4000082 thrsleep syz-fuzzer 64436 422252 17782 0 3 0x4000082 kqread syz-fuzzer 64436 97600 17782 0 3 0x4000082 thrsleep syz-fuzzer 64436 226537 17782 0 3 0x4000082 thrsleep syz-fuzzer 64436 74982 17782 0 3 0x4000082 thrsleep syz-fuzzer 17782 285398 55719 0 3 0x10008a sigsusp ksh 55719 317844 86810 0 3 0x92 select sshd 2305 319423 1 0 3 0x100083 ttyin getty 86810 309067 1 0 3 0x80 select sshd 185 499997 83853 74 3 0x100092 bpf pflogd 83853 281682 1 0 3 0x80 netio pflogd 66362 511996 95385 73 3 0x100090 kqread syslogd 95385 204647 1 0 3 0x100082 netio syslogd 95343 115219 1 77 3 0x100090 poll dhclient 39349 480270 1 0 3 0x80 poll dhclient 2108 378741 0 0 3 0x14200 bored smr 92610 125017 0 0 2 0x14200 zerothread 38919 18469 0 0 3 0x14200 aiodoned aiodoned 38355 161173 0 0 3 0x14200 syncer update 13594 98112 0 0 3 0x14200 cleaner cleaner 27089 511311 0 0 3 0x14200 reaper reaper 70519 192319 0 0 3 0x14200 pgdaemon pagedaemon 35792 271614 0 0 3 0x14200 bored crynlk 71317 206404 0 0 3 0x14200 bored crypto 65232 421690 0 0 3 0x14200 bored viomb 90523 199299 0 0 3 0x40014200 acpi0 acpi0 57515 274386 0 0 3 0x40014200 idle1 26668 443456 0 0 3 0x14200 bored softnet 76368 512809 0 0 3 0x14200 bored systqmp 2450 429712 0 0 3 0x14200 bored systq 92561 49602 0 0 3 0x40014200 bored softclock 48732 42346 0 0 3 0x40014200 idle0 1 292397 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 84512 (syz-executor.0) thread 0xffff800021286550 (1046) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff827aea60) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 ktrstruct+0xee #2 sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 #3 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #4 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd807b03cc08) #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+0x219 #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10146 6490K 7065K 78643K 12081 0 pcb 13 8K 8K 78643K 62 0 rtable 107 3K 4K 78643K 358 0 ifaddr 57 12K 13K 78643K 152 0 counters 44 34K 34K 78643K 86 0 ioctlops 0 0K 4K 78643K 1482 0 iov 0 0K 12K 78643K 15 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1220 77K 77K 78643K 1554 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 0K 0K 78643K 59 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 947 0 proc 62 63K 95K 78643K 499 0 subproc 32 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 41 0 in_multi 33 2K 2K 78643K 41 0 ether_multi 1 0K 0K 78643K 5 0 mrt 0 0K 0K 78643K 12 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 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 182 25K 25K 78643K 12659 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 10 0 NDP 9 0K 0K 78643K 34 0 temp 118 3982K 4046K 78643K 4658 0 kqueue 3 4K 12K 78643K 57 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> 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 39 0 37 1 0 1 1 0 8 0 rtentry 112 49 0 5 2 0 2 2 0 8 0 unpcb 120 200 0 188 1 0 1 1 0 8 0 syncache 296 17 0 17 2 1 1 1 0 8 1 tcpqe 32 38 0 38 3 2 1 1 0 8 1 tcpcb 736 112 0 108 5 3 2 3 0 8 1 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 232 0 226 1 0 1 1 0 8 0 rttmr 72 4 0 4 1 1 0 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 1 0 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 ppxss 1128 5 0 5 1 1 0 1 0 8 0 pffrag 232 6 0 4 1 0 1 1 0 482 0 pffrnode 88 6 0 4 1 0 1 1 0 8 0 pffrent 40 15 0 13 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 14 0 10 1 0 1 1 0 8 0 pfstkey 112 14 0 10 1 0 1 1 0 8 0 pfstate 320 14 0 10 2 0 2 2 0 8 0 pfrule 1360 29 0 24 2 1 1 2 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 48 0 8 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 5 1 0 1 1 0 8 0 semapl 112 57 0 47 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2753 0 1342 89 0 89 89 0 8 0 ffsino 272 2753 0 1342 95 0 95 95 0 8 0 nchpl 144 3970 0 2372 60 0 60 60 0 8 0 uvmvnodes 72 2959 0 0 54 0 54 54 0 8 0 vnodes 224 2959 0 0 175 0 175 175 0 8 0 namei 1024 10047 0 10047 1 0 1 1 0 8 1 percpumem 16 54 0 21 1 0 1 1 0 8 0 scxspl 216 11559 0 11559 9 8 1 8 0 8 1 plimitpl 152 46 0 38 1 0 1 1 0 8 0 sigapl 424 1183 0 1130 7 0 7 7 0 8 1 futexpl 56 5928 0 5928 1 0 1 1 0 8 1 knotepl 112 117 0 97 1 0 1 1 0 8 0 kqueuepl 168 417 0 415 1 0 1 1 0 8 0 pipepl 336 92 0 81 3 1 2 2 0 8 1 fdescpl 496 1146 0 1130 3 0 3 3 0 8 0 filepl 152 3955 0 3852 5 0 5 5 0 8 1 lockfpl 104 147 0 146 1 0 1 1 0 8 0 lockfspl 48 64 0 63 1 0 1 1 0 8 0 sessionpl 144 18 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 12 1 0 1 1 0 8 0 ucredpl 96 675 0 666 1 0 1 1 0 8 0 zombiepl 144 1130 0 1129 1 0 1 1 0 8 0 processpl 1080 1183 0 1129 4 0 4 4 0 8 0 procpl 672 2320 0 2258 6 0 6 6 0 8 0 sosppl 168 5 0 5 1 0 1 1 0 8 1 sockpl 432 481 0 461 4 0 4 4 0 8 1 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 9 0 0 2 0 2 2 0 8 0 mcl2k 2048 178 0 0 16 0 16 16 0 8 0 mtagpl 96 57 0 0 2 0 2 2 0 8 0 mbufpl 256 369 0 0 20 0 20 20 0 8 0 bufpl 280 4414 0 155 305 0 305 305 0 8 0 anonpl 24 269690 0 262326 47 0 47 47 0 186 1 amapchunkpl 152 29624 0 29221 20 2 18 18 0 158 1 amappl16 200 1805 0 1630 11 1 10 10 0 8 0 amappl15 192 973 0 966 1 0 1 1 0 8 0 amappl14 184 5 0 3 2 1 1 1 0 8 0 amappl13 176 25 0 24 1 0 1 1 0 8 0 amappl12 168 37 0 28 1 0 1 1 0 8 0 amappl11 160 57 0 43 1 0 1 1 0 8 0 amappl10 152 24 0 18 1 0 1 1 0 8 0 amappl9 144 293 0 293 1 1 0 1 0 8 0 amappl8 136 335 0 292 2 0 2 2 0 8 0 amappl7 128 55 0 45 1 0 1 1 0 8 0 amappl6 120 114 0 97 1 0 1 1 0 8 0 amappl5 112 1062 0 1051 1 0 1 1 0 8 0 amappl4 104 517 0 489 1 0 1 1 0 8 0 amappl3 96 50 0 46 1 0 1 1 0 8 0 amappl2 88 446 0 399 2 0 2 2 0 8 0 amappl1 80 22834 0 22416 12 2 10 12 0 8 0 amappl 88 12350 0 12231 4 0 4 4 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1146 0 1130 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1146 0 1130 1 0 1 1 0 8 0 vmmpekpl 168 10319 0 10290 2 0 2 2 0 8 0 vmmpepl 168 125543 0 124135 68 1 67 67 0 357 1 vmsppl 368 1145 0 1130 2 0 2 2 0 8 0 rwobjpl 56 23824 0 22970 14 1 13 13 0 8 0 pdppl 4096 2299 0 2260 57 16 41 45 0 8 2 pvpl 32 645429 0 634746 132 37 95 129 0 265 2 pmappl 232 1145 0 1130 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 314 0 23 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd80678a3b40,9,0) at witness_checkorder+0x108b rw_enter(fffffd80678a3b30,1) at rw_enter+0xd4 rrw_enter(fffffd80678a3b30,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8066434d88,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8066434d88,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8066434d88,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800021286550,fffffd8066434d88,fffffd807f7d8900,ffff8000242c3900,ffff8000242c38e0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021286550,ffffffff823b6199,ffff8000242c39e8,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021286550,ffffffff823b6199,ffff8000242c39e8,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800021286550,ffff8000242c3a58,ffff8000242c3aa0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000242c3b20) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000242c3b20) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x17defd76580, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d58ff0) 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 end of kernel end trace frame: 0x7f7ffffe2450, count: -3