witness: lock order reversal: 1st 0xfffffd807703e448 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806e5eee78 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(fffffd806e5eee78,9,0) at witness_checkorder+0x108b rw_enter(fffffd806e5eee68,1) at rw_enter+0xd4 rrw_enter(fffffd806e5eee68,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80677fc248,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80677fc248,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd80677fc248,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff80002126a000,fffffd80677fc248,fffffd807f7d8960,ffff800022311650,ffff800022311630) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff80002126a000,ffffffff823bb89d,ffff800022311738,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff80002126a000,ffffffff823bb89d,ffff800022311738,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff80002126a000,ffff8000223117a8,ffff8000223117f0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff800022311870) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022311870) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd111e534030, count: -12 ddb{0}> show registers rdi 0xffff80002129e000 rsi 0xc71b __ALIGN_SIZE+0xb71b rbp 0xffff800022311260 rbx 0x3 rdx 0xffff80002129e000 rcx 0xc71a __ALIGN_SIZE+0xb71a rax 0xffffffff820a9a87 db_enter+0x17 r8 0xffffffff81e64181 witness_checkorder+0x1061 r9 0x5 r10 0x4fb2f1c30e06f28c r11 0xb43764b40718eb17 r12 0 r13 0xfffffd806e5eee78 r14 0 r15 0xfffffd8002cf7740 rip 0xffffffff820a9a88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022311250 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=444149 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff80002126b500,0xffffffff828758c0 process=0xffff800021226608 user=0xffff80002230c000, vmspace=0xfffffd806992b188 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 5201 323210 95046 0 7 0x1 syz-executor.0 * 5201 444149 95046 0 7 0x4000001 syz-executor.0 68284 92391 36772 0 2 0 syz-executor.1 68284 253955 36772 0 3 0x4000080 fsleep syz-executor.1 36772 210688 36346 0 3 0x82 nanoslp syz-executor.1 62013 24368 0 0 3 0x14200 bored sosplice 95046 343568 36346 0 3 0x82 nanoslp syz-executor.0 36346 176741 81682 0 3 0x82 thrsleep syz-fuzzer 36346 21063 81682 0 3 0x4000082 nanoslp syz-fuzzer 36346 97601 81682 0 3 0x4000082 thrsleep syz-fuzzer 36346 133908 81682 0 3 0x4000082 thrsleep syz-fuzzer 36346 4126 81682 0 3 0x4000082 kqread syz-fuzzer 36346 398788 81682 0 3 0x4000082 thrsleep syz-fuzzer 36346 370567 81682 0 3 0x4000082 thrsleep syz-fuzzer 36346 168001 81682 0 3 0x4000082 nanoslp syz-fuzzer 81682 201287 61095 0 3 0x10008a sigsusp ksh 61095 472720 74847 0 3 0x92 select sshd 57452 457299 1 0 3 0x100083 ttyin getty 74847 143838 1 0 3 0x80 select sshd 14747 430822 76110 74 3 0x100092 bpf pflogd 76110 392160 1 0 3 0x80 netio pflogd 5797 513698 72712 73 3 0x100090 kqread syslogd 72712 462073 1 0 3 0x100082 netio syslogd 96260 192181 1 77 3 0x100090 poll dhclient 40397 265924 1 0 3 0x80 poll dhclient 20064 347261 0 0 3 0x14200 bored smr 39123 147101 0 0 2 0x14200 zerothread 95334 100075 0 0 3 0x14200 aiodoned aiodoned 68895 309751 0 0 3 0x14200 syncer update 97629 10199 0 0 3 0x14200 cleaner cleaner 49115 418044 0 0 3 0x14200 reaper reaper 55529 16284 0 0 3 0x14200 pgdaemon pagedaemon 41656 482205 0 0 3 0x14200 bored crynlk 74428 164277 0 0 3 0x14200 bored crypto 7815 69152 0 0 3 0x14200 bored viomb 84102 46466 0 0 3 0x40014200 acpi0 acpi0 53825 114442 0 0 3 0x40014200 idle1 27143 258973 0 0 3 0x14200 bored softnet 94867 104867 0 0 3 0x14200 bored systqmp 28019 102540 0 0 3 0x14200 bored systq 13522 172987 0 0 3 0x40014200 bored softclock 17541 38328 0 0 3 0x40014200 idle0 1 396387 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 5201 (syz-executor.0) thread 0xffff80002126a000 (444149) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8287a8e8) #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 (0xfffffd807703e448) #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 10153 6569K 7283K 78643K 18672 0 pcb 13 8K 8K 78643K 317 0 rtable 92 4K 4K 78643K 843 0 ifaddr 54 11K 13K 78643K 155 0 counters 44 34K 34K 78643K 76 0 ioctlops 0 0K 4K 78643K 1685 0 iov 0 0K 24K 78643K 114 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1225 77K 78K 78643K 3670 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 33 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 522 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 6 17K 25K 78643K 6878 0 sigio 0 0K 0K 78643K 82 0 proc 62 63K 95K 78643K 867 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 361 0 in_multi 22 1K 2K 78643K 375 0 ether_multi 1 0K 0K 78643K 94 0 mrt 1 0K 0K 78643K 50 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 497 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 279 289K 289K 78643K 83611 0 UVM aobj 31 7K 7K 78643K 31 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 1K 78643K 277 0 NDP 9 0K 0K 78643K 44 0 temp 120 3986K 16378K 78643K 19897 0 kqueue 3 4K 12K 78643K 348 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 120 203 0 201 1 0 1 1 0 8 0 rtentry 112 175 0 141 2 0 2 2 0 8 0 unpcb 120 1225 0 1205 2 1 1 2 0 8 0 syncache 296 16 0 16 3 3 0 1 0 8 0 tcpqe 32 57 0 57 4 4 0 1 0 8 0 tcpcb 736 814 0 810 18 16 2 5 0 8 1 arp 120 24 0 19 1 0 1 1 0 8 0 inpcb 304 2288 0 2282 4 3 1 2 0 8 0 rttmr 72 8 0 8 2 2 0 1 0 8 0 nd6 48 22 0 19 1 0 1 1 0 8 0 pkpcb 40 81 0 81 11 11 0 1 0 8 0 kcovpl 48 3 0 1 1 0 1 1 0 8 0 ppxss 1128 11 0 11 2 2 0 1 0 8 0 pffrag 232 5 0 5 1 1 0 1 0 482 0 pffrnode 88 5 0 5 1 1 0 1 0 8 0 pffrent 40 10 0 10 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 pfrktable 1344 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 104 0 81 1 0 1 1 0 8 0 pfstkey 112 104 0 81 2 0 2 2 0 8 0 pfstate 320 104 0 81 5 2 3 4 0 8 1 pfrule 1360 69 0 57 3 1 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 784 0 635 16 6 10 13 0 8 0 art_table 32 785 0 635 2 0 2 2 0 8 0 art_node 16 174 0 143 1 0 1 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 515 0 505 1 0 1 1 0 8 0 shmpl 112 28 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 9782 0 8368 90 1 89 89 0 8 0 ffsino 272 9782 0 8368 95 0 95 95 0 8 0 nchpl 144 17585 0 16001 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 42534 0 42534 1 0 1 1 0 8 1 percpumem 16 49 0 16 1 0 1 1 0 8 0 vcpupl 1984 20 0 0 3 0 3 3 0 8 0 vmpool 560 33 0 13 3 1 2 2 0 8 0 scsiplug 72 7 0 7 1 1 0 1 0 8 0 scxspl 216 50612 0 50612 9 8 1 8 0 8 1 plimitpl 152 126 0 118 1 0 1 1 0 8 0 sigapl 424 7091 0 7057 4 0 4 4 0 8 0 futexpl 56 42770 0 42769 1 0 1 1 0 8 0 knotepl 112 515 0 495 1 0 1 1 0 8 0 kqueuepl 168 3134 0 3131 1 0 1 1 0 8 0 pipepl 336 241 0 230 11 9 2 2 0 8 1 fdescpl 496 7074 0 7057 3 0 3 3 0 8 0 filepl 152 21199 0 21094 6 1 5 6 0 8 0 lockfpl 104 800 0 798 1 0 1 1 0 8 0 lockfspl 48 236 0 234 1 0 1 1 0 8 0 sessionpl 144 19 0 8 1 0 1 1 0 8 0 pgrppl 48 57 0 46 1 0 1 1 0 8 0 ucredpl 96 2535 0 2526 1 0 1 1 0 8 0 zombiepl 144 7057 0 7057 1 0 1 1 0 8 1 processpl 1080 7091 0 7057 3 0 3 3 0 8 0 procpl 672 15313 0 15270 4 0 4 4 0 8 0 sosppl 168 81 0 81 9 9 0 1 0 8 0 sockpl 480 3810 0 3782 7 2 5 6 0 8 0 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 10 0 0 1 0 1 1 0 8 0 mcl8k 8192 15 0 0 2 0 2 2 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k 2048 276 0 0 15 0 15 15 0 8 0 mtagpl 96 293 0 0 7 0 7 7 0 8 0 mbufpl 256 887 0 0 48 0 48 48 0 8 0 bufpl 280 11095 0 4829 448 0 448 448 0 8 0 anonpl 24 1879769 0 1870825 147 64 83 96 0 186 27 amapchunkpl 152 199971 0 199551 44 27 17 29 0 158 0 amappl16 200 17763 0 17477 71 55 16 37 0 8 0 amappl15 192 1690 0 1683 1 0 1 1 0 8 0 amappl14 184 2 0 1 1 0 1 1 0 8 0 amappl13 176 5250 0 5244 1 0 1 1 0 8 0 amappl12 168 35 0 26 1 0 1 1 0 8 0 amappl11 160 46 0 34 1 0 1 1 0 8 0 amappl10 152 21 0 14 1 0 1 1 0 8 0 amappl9 144 14 0 13 2 1 1 1 0 8 0 amappl8 136 463 0 381 3 0 3 3 0 8 0 amappl7 128 61 0 52 1 0 1 1 0 8 0 amappl6 120 114 0 99 1 0 1 1 0 8 0 amappl5 112 5746 0 5734 1 0 1 1 0 8 0 amappl4 104 597 0 567 1 0 1 1 0 8 0 amappl3 96 7156 0 7146 1 0 1 1 0 8 0 amappl2 88 556 0 511 2 0 2 2 0 8 0 amappl1 80 120850 0 120421 13 3 10 12 0 8 0 amappl 88 82992 0 82843 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 30 0 0 1 0 1 1 0 8 0 uaddrrnd 24 7107 0 7070 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7107 0 7070 1 0 1 1 0 8 0 vmmpekpl 168 37205 0 37175 2 0 2 2 0 8 0 vmmpepl 168 790805 0 789113 114 35 79 92 0 357 5 vmsppl 368 7106 0 7070 4 0 4 4 0 8 0 rwobjpl 56 138409 0 137376 33 18 15 21 0 8 0 pdppl 4096 14221 0 14160 79 18 61 61 0 8 0 pvpl 32 3930079 0 3917465 284 131 153 166 0 265 48 pmappl 232 7106 0 7070 5 2 3 3 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 394 0 53 10 0 10 10 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(fffffd806e5eee78,9,0) at witness_checkorder+0x108b rw_enter(fffffd806e5eee68,1) at rw_enter+0xd4 rrw_enter(fffffd806e5eee68,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80677fc248,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80677fc248,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd80677fc248,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff80002126a000,fffffd80677fc248,fffffd807f7d8960,ffff800022311650,ffff800022311630) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff80002126a000,ffffffff823bb89d,ffff800022311738,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff80002126a000,ffffffff823bb89d,ffff800022311738,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff80002126a000,ffff8000223117a8,ffff8000223117f0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff800022311870) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022311870) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd111e534030, 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(ffffffff8287a6e0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8287a6e0) at __mp_lock+0x122 sys/kern/kern_lock.c:147 ktrstruct(ffff80002126b500,ffffffff823cb0dd,ffff80002230b5e8,10) at ktrstruct+0xee sys_clock_gettime(ffff80002126b500,ffff80002230b650,ffff80002230b6a0) at sys_clock_gettime+0xfb sys/kern/kern_time.c:171 syscall(ffff80002230b720) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002230b720) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeac30, count: -8