witness: lock order reversal: 1st 0xfffffd807d9c1638 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80728b1700 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(fffffd80728b1700,9,0) at witness_checkorder+0x108b rw_enter(fffffd80728b16f0,1) at rw_enter+0xd4 rrw_enter(fffffd80728b16f0,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8069815140,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8069815140,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8069815140,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800021278540,fffffd8069815140,fffffd807f7d8900,ffff8000212ad530,ffff8000212ad510) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021278540,ffffffff823bc3dc,ffff8000212ad618,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021278540,ffffffff823bc3dc,ffff8000212ad618,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800021278540,ffff8000212ad688,ffff8000212ad6d0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000212ad750) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212ad750) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x91a2b91d880, count: -12 ddb{0}> show registers rdi 0xffff8000212b6000 rsi 0x156da acpi_pdirpa+0x1542 rbp 0xffff8000212ad140 rbx 0x3 rdx 0xffff8000212b6000 rcx 0x156d9 acpi_pdirpa+0x1541 rax 0xffffffff815b7917 db_enter+0x17 r8 0xffffffff811906c1 witness_checkorder+0x1061 r9 0x5 r10 0xe12da269cc91f02d r11 0x47779d9a9dcf1e7b r12 0 r13 0xfffffd80728b1700 r14 0 r15 0xfffffd8002cfc740 rip 0xffffffff815b7918 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212ad130 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=369658 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021278fc0,0xffff800021278010 process=0xffff8000212272b0 user=0xffff8000212a8000, vmspace=0xfffffd80084da2e0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94743 319854 3208 0 7 0 syz-executor.1 78273 73713 98621 0 2 0 syz-executor.0 *78273 369658 98621 0 7 0x4000001 syz-executor.0 3208 249738 49101 0 3 0x82 nanoslp syz-executor.1 98621 490106 49101 0 3 0x82 nanoslp syz-executor.0 49101 331697 23810 0 3 0x82 thrsleep syz-fuzzer 49101 87205 23810 0 3 0x4000082 nanoslp syz-fuzzer 49101 158421 23810 0 3 0x4000082 kqread syz-fuzzer 49101 371962 23810 0 3 0x4000082 thrsleep syz-fuzzer 49101 392723 23810 0 3 0x4000082 nanoslp syz-fuzzer 49101 488049 23810 0 3 0x4000082 thrsleep syz-fuzzer 49101 430008 23810 0 3 0x4000082 thrsleep syz-fuzzer 23810 35405 34134 0 3 0x10008a sigsusp ksh 34134 313406 37523 0 3 0x92 select sshd 78017 382789 1 0 3 0x100083 ttyin getty 37523 156643 1 0 3 0x80 select sshd 27034 219436 60374 74 3 0x100092 bpf pflogd 60374 29633 1 0 3 0x80 netio pflogd 86827 102476 16396 73 3 0x100090 kqread syslogd 16396 4483 1 0 3 0x100082 netio syslogd 27246 372155 1 77 3 0x100090 poll dhclient 46729 118190 1 0 3 0x80 poll dhclient 84403 398077 0 0 3 0x14200 bored smr 76433 38089 0 0 2 0x14200 zerothread 9913 357540 0 0 3 0x14200 aiodoned aiodoned 18492 338665 0 0 3 0x14200 syncer update 12376 206715 0 0 3 0x14200 cleaner cleaner 34031 232592 0 0 3 0x14200 reaper reaper 77868 332310 0 0 3 0x14200 pgdaemon pagedaemon 48892 445916 0 0 3 0x14200 bored crynlk 64785 334769 0 0 3 0x14200 bored crypto 91809 9187 0 0 3 0x14200 bored viomb 46628 411146 0 0 3 0x40014200 acpi0 acpi0 2845 524077 0 0 3 0x40014200 idle1 51856 204840 0 0 3 0x14200 bored softnet 49218 382889 0 0 3 0x14200 bored systqmp 71315 93453 0 0 3 0x14200 bored systq 76961 340859 0 0 3 0x40014200 bored softclock 91044 366043 0 0 3 0x40014200 idle0 1 65862 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 78273 (syz-executor.0) thread 0xffff800021278540 (369658) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828bbff8) #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 (0xfffffd807d9c1638) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10120 6480K 6933K 78643K 11503 0 pcb 13 8K 8K 78643K 29 0 rtable 105 3K 3K 78643K 235 0 ifaddr 44 10K 11K 78643K 74 0 counters 44 34K 34K 78643K 58 0 ioctlops 0 0K 4K 78643K 1491 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1220 77K 77K 78643K 1317 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 8 0K 1K 78643K 14 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 6 17K 25K 78643K 291 0 sigio 0 0K 0K 78643K 9 0 proc 59 63K 83K 78643K 437 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 34 0 in_multi 33 2K 2K 78643K 48 0 ether_multi 1 0K 0K 78643K 1 0 mrt 0 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 2K 78643K 361 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 174 24K 24K 78643K 4816 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 17 0 temp 66 3971K 4035K 78643K 2631 0 kqueue 3 4K 8K 78643K 18 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 35 0 33 1 0 1 1 0 8 0 rtentry 112 49 0 5 2 0 2 2 0 8 0 unpcb 120 40 0 28 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 111 0 111 1 1 0 1 0 8 0 tcpcb 736 15 0 11 1 0 1 1 0 8 0 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 110 0 104 1 0 1 1 0 8 0 rttmr 72 4 0 4 1 0 1 1 0 8 1 nd6 48 6 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 ppxss 1128 7 0 7 1 1 0 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 15 0 0 1 0 1 1 0 8 0 pfstkey 112 15 0 0 1 0 1 1 0 8 0 pfstate 320 15 0 0 2 0 2 2 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 48 0 8 1 0 1 1 0 8 0 semupl 112 5 0 5 1 0 1 1 0 8 1 semapl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1749 0 337 89 0 89 89 0 8 0 ffsino 272 1749 0 337 95 0 95 95 0 8 0 nchpl 144 2238 0 629 60 0 60 60 0 8 0 uvmvnodes 72 1852 0 0 34 0 34 34 0 8 0 vnodes 224 1852 0 0 109 0 109 109 0 8 0 namei 1024 5606 0 5606 1 0 1 1 0 8 1 percpumem 16 40 0 7 1 0 1 1 0 8 0 scxspl 216 6432 0 6432 2 1 1 2 0 8 1 plimitpl 152 20 0 12 1 0 1 1 0 8 0 sigapl 424 506 0 473 4 0 4 4 0 8 0 futexpl 56 1488 0 1488 1 0 1 1 0 8 1 knotepl 112 78 0 58 1 0 1 1 0 8 0 kqueuepl 168 95 0 93 1 0 1 1 0 8 0 pipepl 336 81 0 70 2 0 2 2 0 8 1 fdescpl 496 490 0 473 3 0 3 3 0 8 0 filepl 152 1722 0 1619 5 0 5 5 0 8 1 lockfpl 104 44 0 43 1 0 1 1 0 8 0 lockfspl 48 21 0 20 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 77 0 68 1 0 1 1 0 8 0 zombiepl 144 473 0 473 1 0 1 1 0 8 1 processpl 1080 506 0 473 3 0 3 3 0 8 0 procpl 672 822 0 782 4 0 4 4 0 8 0 sockpl 480 185 0 165 3 0 3 3 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 167 0 0 20 0 20 20 0 8 0 mtagpl 96 16 0 0 1 0 1 1 0 8 0 mbufpl 256 260 0 0 16 0 16 16 0 8 0 bufpl 280 3668 0 155 251 0 251 251 0 8 0 anonpl 24 103862 0 95980 49 0 49 49 0 186 0 amapchunkpl 152 11010 0 10597 20 3 17 19 0 158 0 amappl16 200 721 0 515 11 0 11 11 0 8 0 amappl15 192 317 0 309 1 0 1 1 0 8 0 amappl14 184 2 0 2 1 1 0 1 0 8 0 amappl13 176 27 0 26 1 0 1 1 0 8 0 amappl12 168 33 0 27 1 0 1 1 0 8 0 amappl11 160 54 0 41 1 0 1 1 0 8 0 amappl10 152 22 0 16 1 0 1 1 0 8 0 amappl9 144 296 0 293 1 0 1 1 0 8 0 amappl8 136 312 0 283 2 1 1 2 0 8 0 amappl7 128 57 0 45 1 0 1 1 0 8 0 amappl6 120 105 0 91 1 0 1 1 0 8 0 amappl5 112 384 0 372 1 0 1 1 0 8 0 amappl4 104 517 0 488 1 0 1 1 0 8 0 amappl3 96 39 0 35 1 0 1 1 0 8 0 amappl2 88 424 0 376 2 0 2 2 0 8 0 amappl1 80 11305 0 10883 13 3 10 12 0 8 1 amappl 88 4549 0 4419 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 24 490 0 473 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 490 0 473 1 0 1 1 0 8 0 vmmpekpl 168 6771 0 6746 2 0 2 2 0 8 0 vmmpepl 168 52312 0 50803 70 1 69 70 0 357 3 vmsppl 368 489 0 473 2 0 2 2 0 8 0 rwobjpl 56 11583 0 10715 16 3 13 14 0 8 0 pdppl 4096 987 0 946 57 13 44 45 0 8 3 pvpl 32 273806 0 262622 128 2 126 128 0 265 34 pmappl 232 489 0 473 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 306 0 16 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(fffffd80728b1700,9,0) at witness_checkorder+0x108b rw_enter(fffffd80728b16f0,1) at rw_enter+0xd4 rrw_enter(fffffd80728b16f0,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8069815140,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8069815140,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8069815140,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800021278540,fffffd8069815140,fffffd807f7d8900,ffff8000212ad530,ffff8000212ad510) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021278540,ffffffff823bc3dc,ffff8000212ad618,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021278540,ffffffff823bc3dc,ffff8000212ad618,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800021278540,ffff8000212ad688,ffff8000212ad6d0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000212ad750) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212ad750) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x91a2b91d880, 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 __mp_lock(ffffffff828bbdf0) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828bbdf0) at __mp_lock+0x129 sys/kern/kern_lock.c:147 syscall(ffff8000222bbb60) at syscall+0x439 mi_syscall sys/sys/syscall_mi.h:93 [inline] syscall(ffff8000222bbb60) at syscall+0x439 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff0ec0, count: -6