witness: lock order reversal: 1st 0xfffffd807515b068 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806a033810 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(fffffd806a033810,9,0) at witness_checkorder+0x108b rw_enter(fffffd806a033800,1) at rw_enter+0xd4 rrw_enter(fffffd806a033800,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8074c4b890,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8074c4b890,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8074c4b890,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff80002122ca80,fffffd8074c4b890,fffffd807f7d8540,ffff8000212b71c0,ffff8000212b71a0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff80002122ca80,ffffffff823b8e5c,ffff8000212b72a8,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff80002122ca80,ffffffff823b8e5c,ffff8000212b72a8,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff80002122ca80,ffff8000212b7318,ffff8000212b7360) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000212b73e0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212b73e0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x48ed7b17e70, count: -12 ddb{0}> show registers rdi 0xffff8000226c0000 rsi 0x16a99 acpi_pdirpa+0x2901 rbp 0xffff8000212b6dd0 rbx 0x3 rdx 0xffff8000226c0000 rcx 0x16a98 acpi_pdirpa+0x2900 rax 0xffffffff81b31cc7 db_enter+0x17 r8 0xffffffff81e60a01 witness_checkorder+0x1061 r9 0x5 r10 0xbe9d49d9fcf822f6 r11 0x4b26db82f9748da6 r12 0 r13 0xfffffd806a033810 r14 0 r15 0xfffffd8002cf8740 rip 0xffffffff81b31cc8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212b6dc0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=128873 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff80002122cfc0,0xffff80002122c550 process=0xffff800021224010 user=0xffff8000212b2000, vmspace=0xfffffd80084d6a10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58305 15893 0 0 3 0x14200 acct acct 55489 460140 47427 0 7 0x1 syz-executor.1 *55489 128873 47427 0 7 0x4000001 syz-executor.1 47427 92985 18189 0 3 0x82 nanoslp syz-executor.1 3319 365861 18189 0 3 0x2 biowait syz-executor.0 18189 248455 89133 0 3 0x82 thrsleep syz-fuzzer 18189 33267 89133 0 3 0x4000082 thrsleep syz-fuzzer 18189 261792 89133 0 3 0x4000082 thrsleep syz-fuzzer 18189 184151 89133 0 3 0x4000082 thrsleep syz-fuzzer 18189 281016 89133 0 3 0x4000082 thrsleep syz-fuzzer 18189 523953 89133 0 3 0x4000082 thrsleep syz-fuzzer 18189 289263 89133 0 3 0x4000082 thrsleep syz-fuzzer 18189 58060 89133 0 3 0x4000082 kqread syz-fuzzer 18189 236575 89133 0 3 0x4000082 thrsleep syz-fuzzer 89133 62351 27940 0 3 0x10008a sigsusp ksh 27940 69275 23723 0 3 0x92 select sshd 36482 146608 1 0 3 0x100083 ttyin getty 23723 322182 1 0 3 0x80 select sshd 13688 273008 36626 74 3 0x100092 bpf pflogd 36626 430703 1 0 3 0x80 netio pflogd 5112 21761 41181 73 3 0x100090 kqread syslogd 41181 467462 1 0 3 0x100082 netio syslogd 252 293541 1 77 3 0x100090 poll dhclient 70694 184440 1 0 3 0x80 poll dhclient 92144 96926 0 0 3 0x14200 bored smr 15270 131784 0 0 3 0x14200 pgzero zerothread 45699 279548 0 0 3 0x14200 aiodoned aiodoned 33616 173107 0 0 3 0x14200 syncer update 53334 56447 0 0 3 0x14200 cleaner cleaner 57668 262589 0 0 3 0x14200 reaper reaper 49108 321350 0 0 3 0x14200 pgdaemon pagedaemon 49256 287786 0 0 3 0x14200 bored crynlk 9484 495465 0 0 3 0x14200 bored crypto 59185 132008 0 0 3 0x14200 bored viomb 63599 28361 0 0 3 0x40014200 acpi0 acpi0 139 139525 0 0 3 0x40014200 idle1 47137 523574 0 0 3 0x14200 bored softnet 71517 437827 0 0 3 0x14200 bored systqmp 11830 22753 0 0 3 0x14200 bored systq 98910 24118 0 0 3 0x40014200 bored softclock 59287 284315 0 0 3 0x40014200 idle0 1 123940 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 55489 (syz-executor.1) thread 0xffff80002122ca80 (128873) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff827a2c08) #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:585 #4 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd807515b068) #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:585 #3 Xsyscall+0x128 Process 3319 (syz-executor.0) thread 0xffff80002122d7a0 (365861) exclusive rrwlock inode r = 0 (0xfffffd806a180e70) #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+0x416 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:461 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x135 sys/ufs/ffs/ffs_vfsops.c:1350 #5 ffs_inode_alloc+0x1e1 sys/ufs/ffs/ffs_alloc.c:394 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:457 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3075 #9 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806abdba28) #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+0x416 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x88 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+0xe6 sys/kern/vfs_lookup.c:413 #6 namei+0x58a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3060 #8 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10127 6501K 6513K 78643K 15192 0 pcb 13 8K 8K 78643K 706 0 rtable 105 3K 3K 78643K 195 0 ifaddr 44 10K 10K 78643K 45 0 counters 44 34K 34K 78643K 44 0 ioctlops 0 0K 4K 78643K 1989 0 iov 0 0K 12K 78643K 322 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1222 77K 77K 78643K 5620 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 694 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 895 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 35246 0 proc 60 63K 95K 78643K 5904 0 subproc 32 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 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 1162 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 244 29K 37K 78643K 423133 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 10 0 temp 106 3981K 4045K 78643K 77239 0 kqueue 3 4K 4K 78643K 3 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 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 30234 0 30222 16 15 1 2 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpcb 736 87 0 83 4 3 1 2 0 8 0 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 1368 0 1362 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 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 12 0 10 1 0 1 1 0 8 0 pfstkey 112 12 0 10 1 0 1 1 0 8 0 pfstate 320 12 0 10 1 0 1 1 0 8 0 pfrule 1360 21 0 16 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 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 64 0 64 3 3 0 1 0 8 0 semapl 112 893 0 883 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 43221 0 41753 94 2 92 92 0 8 0 ffsino 272 43221 0 41753 98 0 98 98 0 8 0 nchpl 144 92308 0 90698 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 221200 0 221199 1 0 1 1 0 8 0 percpumem 16 33 0 0 1 0 1 1 0 8 0 scxspl 216 234889 0 234887 9 8 1 8 0 8 0 plimitpl 152 623 0 615 1 0 1 1 0 8 0 sigapl 424 35462 0 35429 4 0 4 4 0 8 0 futexpl 56 148566 0 148566 1 0 1 1 0 8 1 knotepl 112 62 0 42 1 0 1 1 0 8 0 kqueuepl 168 2 0 0 1 0 1 1 0 8 0 pipepl 336 1336 0 1325 31 29 2 2 0 8 1 fdescpl 496 35445 0 35429 3 0 3 3 0 8 0 filepl 152 108017 0 107913 27 22 5 6 0 8 1 lockfpl 104 2757 0 2755 1 0 1 1 0 8 0 lockfspl 48 1111 0 1109 1 0 1 1 0 8 0 sessionpl 144 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 8959 0 8950 1 0 1 1 0 8 0 zombiepl 144 35429 0 35429 1 0 1 1 0 8 1 processpl 1080 35462 0 35429 3 0 3 3 0 8 0 procpl 672 78396 0 78354 7 3 4 5 0 8 0 sockpl 480 31621 0 31601 77 73 4 6 0 8 1 mcl64k 65536 13 0 0 2 0 2 2 0 8 0 mcl16k 16384 16 0 0 2 0 2 2 0 8 0 mcl12k 12288 32 0 0 2 0 2 2 0 8 0 mcl9k 9216 58 0 0 2 0 2 2 0 8 0 mcl8k 8192 41 0 0 4 1 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 101 0 0 11 0 11 11 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1103 0 0 17 1 16 16 0 8 0 bufpl 280 40426 0 34160 448 0 448 448 0 8 0 anonpl 24 9096738 0 9090328 71 28 43 53 0 186 0 amapchunkpl 152 1008186 0 1007814 45 29 16 21 0 158 0 amappl16 200 67343 0 67194 10 2 8 9 0 8 0 amappl15 192 63 0 57 1 0 1 1 0 8 0 amappl14 184 8 0 4 1 0 1 1 0 8 0 amappl13 176 17435 0 17433 1 0 1 1 0 8 0 amappl12 168 42 0 33 1 0 1 1 0 8 0 amappl11 160 50 0 37 1 0 1 1 0 8 0 amappl10 152 32 0 23 1 0 1 1 0 8 0 amappl9 144 299 0 298 2 1 1 1 0 8 0 amappl8 136 36465 0 36344 5 0 5 5 0 8 0 amappl7 128 57 0 46 1 0 1 1 0 8 0 amappl6 120 108 0 96 1 0 1 1 0 8 0 amappl5 112 35492 0 35481 1 0 1 1 0 8 0 amappl4 104 902 0 875 1 0 1 1 0 8 0 amappl3 96 19926 0 19921 1 0 1 1 0 8 0 amappl2 88 2202 0 2156 2 0 2 2 0 8 0 amappl1 80 588001 0 587595 12 3 9 12 0 8 0 amappl 88 422298 0 422181 5 1 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 64 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 35445 0 35429 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 35445 0 35429 1 0 1 1 0 8 0 vmmpekpl 168 194323 0 194301 2 0 2 2 0 8 0 vmmpepl 168 3880796 0 3879345 89 20 69 69 0 357 1 vmsppl 368 35444 0 35429 2 0 2 2 0 8 0 rwobjpl 56 665366 0 664475 24 11 13 14 0 8 0 pdppl 4096 70897 0 70858 57 16 41 45 0 8 2 pvpl 32 15156534 0 15146821 253 169 84 129 0 265 1 pmappl 232 35444 0 35429 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 347 0 55 10 1 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(fffffd806a033810,9,0) at witness_checkorder+0x108b rw_enter(fffffd806a033800,1) at rw_enter+0xd4 rrw_enter(fffffd806a033800,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8074c4b890,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8074c4b890,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8074c4b890,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff80002122ca80,fffffd8074c4b890,fffffd807f7d8540,ffff8000212b71c0,ffff8000212b71a0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff80002122ca80,ffffffff823b8e5c,ffff8000212b72a8,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff80002122ca80,ffffffff823b8e5c,ffff8000212b72a8,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff80002122ca80,ffff8000212b7318,ffff8000212b7360) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000212b73e0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212b73e0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x48ed7b17e70, 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x48 sys/dev/kcov.c:149 ktrstruct(ffff80002122cfc0,ffffffff823c639b,ffff800021208608,10) at ktrstruct+0xee sys_clock_gettime(ffff80002122cfc0,ffff800021208670,ffff8000212086c0) at sys_clock_gettime+0xfb sys/kern/kern_time.c:171 syscall(ffff800021208740) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021208740) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe6920, count: -8