kernel: protection fault trap, code=0 Stopped at lf_advlock+0x223: addl $0x1,0x28(%rbx) ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace lf_advlock(ffff800000d0e0e0,0,fffffd8066e421e0,8,ffff80002b013898,30) at lf_advlock+0x223 ls_ref sys/kern/vfs_lockf.c:138 [inline] lf_advlock(ffff800000d0e0e0,0,fffffd8066e421e0,8,ffff80002b013898,30) at lf_advlock+0x223 sys/kern/vfs_lockf.c:278 VOP_ADVLOCK(fffffd807d3ff3c0,fffffd8066e421e0,8,ffff80002b013898,30) at VOP_ADVLOCK+0x71 sys/kern/vfs_vops.c:612 sys_flock(ffff800021200848,ffff80002b013918,ffff80002b013960) at sys_flock+0x1cd syscall(ffff80002b0139e0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002b0139e0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x37b22f90f00, count: -5 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002b0137e0 rbx 0xdead4110dead4110 rdx 0 rcx 0x5 rax 0xffff800021200848 r8 0xffff80002b013898 r9 0x30 r10 0 r11 0x3e8243246b60e55d r12 0xffff800000d0e0e0 r13 0x8 r14 0xffff80002b013898 r15 0 rip 0xffffffff825c94e3 lf_advlock+0x223 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002b013740 ss 0x10 lf_advlock+0x223: addl $0x1,0x28(%rbx) ddb{0}> show proc PROC (syz-executor.5) pid=297787 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80002121d330,0xffff8000212005a0 process=0xffff80002afdae30 user=0xffff80002b00e000, vmspace=0xfffffd8065516540 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21591 513130 21741 32767 7 0x10 syz-executor.4 15369 418782 77836 32767 2 0x10 syz-executor.3 15369 376108 77836 32767 2 0x4000010 syz-executor.3 9704 2036 50872 32767 2 0x10 syz-executor.1 9704 174028 50872 32767 3 0x4000090 fsleep syz-executor.1 49136 513703 23090 32767 2 0x10 syz-executor.7 49136 181851 23090 32767 3 0x4000090 fsleep syz-executor.7 49837 329417 24247 32767 2 0x10 syz-executor.2 49837 408023 24247 32767 3 0x4000090 fsleep syz-executor.2 49837 160795 24247 32767 3 0x4000090 fsleep syz-executor.2 54554 210168 12729 32767 2 0x10 syz-executor.0 54554 416050 12729 32767 2 0x4000010 syz-executor.0 41144 225301 19096 32767 2 0x10 syz-executor.5 41144 307547 19096 32767 3 0x4000010 lockflk syz-executor.5 *41144 297787 19096 32767 7 0x4000010 syz-executor.5 16532 382051 43967 32767 2 0x10 syz-executor.6 16532 404698 43967 32767 3 0x4000090 fsleep syz-executor.6 23090 205008 77956 32767 3 0x90 nanoslp syz-executor.7 77956 376200 13101 0 3 0x82 wait syz-executor.7 24247 80623 60162 32767 3 0x90 nanoslp syz-executor.2 60162 486982 13101 0 3 0x82 wait syz-executor.2 77836 89711 24693 32767 3 0x90 nanoslp syz-executor.3 24693 57344 13101 0 3 0x82 wait syz-executor.3 50872 478490 76403 32767 3 0x90 nanoslp syz-executor.1 76403 311137 13101 0 3 0x82 wait syz-executor.1 21741 98576 57979 32767 3 0x90 nanoslp syz-executor.4 57979 316388 13101 0 3 0x82 wait syz-executor.4 3349 273081 0 0 3 0x14200 bored sosplice 43967 83719 85354 32767 3 0x90 nanoslp syz-executor.6 85354 120815 13101 0 3 0x82 wait syz-executor.6 19096 152971 53105 32767 3 0x90 nanoslp syz-executor.5 53105 500647 13101 0 3 0x82 wait syz-executor.5 12729 494476 58881 32767 3 0x90 nanoslp syz-executor.0 58881 375412 13101 0 3 0x82 wait syz-executor.0 13101 110822 92958 0 3 0x82 thrsleep syz-fuzzer 13101 474362 92958 0 3 0x4000082 thrsleep syz-fuzzer 13101 481196 92958 0 3 0x4000082 wait syz-fuzzer 13101 477425 92958 0 3 0x4000082 thrsleep syz-fuzzer 13101 435331 92958 0 3 0x4000082 wait syz-fuzzer 13101 31475 92958 0 3 0x4000082 wait syz-fuzzer 13101 127248 92958 0 3 0x4000082 wait syz-fuzzer 13101 413583 92958 0 3 0x4000082 thrsleep syz-fuzzer 13101 395848 92958 0 3 0x4000082 thrsleep syz-fuzzer 13101 244205 92958 0 3 0x4000082 kqread syz-fuzzer 13101 93855 92958 0 3 0x4000082 thrsleep syz-fuzzer 13101 35334 92958 0 3 0x4000082 wait syz-fuzzer 13101 504840 92958 0 3 0x4000082 wait syz-fuzzer 13101 393849 92958 0 3 0x4000082 wait syz-fuzzer 13101 353920 92958 0 3 0x4000082 wait syz-fuzzer 13101 448672 92958 0 3 0x4000082 thrsleep syz-fuzzer 92958 297739 21527 0 3 0x10008a sigsusp ksh 21527 218033 86694 0 3 0x9a kqread sshd 6655 169011 1 0 3 0x100083 ttyin getty 86694 494268 1 0 3 0x88 kqread sshd 35061 2039 16010 73 3 0x1100090 kqread syslogd 16010 375133 1 0 3 0x100082 netio syslogd 73499 113482 1 0 3 0x100080 kqread resolvd 93024 478817 93433 77 3 0x100092 kqread dhcpleased 15426 10339 93433 77 3 0x100092 kqread dhcpleased 93433 320940 1 0 3 0x80 kqread dhcpleased 44414 89559 0 0 3 0x14200 bored smr 70010 119823 0 0 2 0x14200 zerothread 10573 344071 0 0 3 0x14200 aiodoned aiodoned 20441 209772 0 0 3 0x14200 syncer update 74885 234262 0 0 3 0x14200 cleaner cleaner 55536 18304 0 0 3 0x14200 reaper reaper 40095 501089 0 0 3 0x14200 pgdaemon pagedaemon 40548 161954 0 0 3 0x14200 bored viomb 37443 507924 0 0 3 0x40014200 acpi0 acpi0 42770 197767 0 0 3 0x40014200 idle1 27059 12775 0 0 3 0x14200 bored softnet 19783 44694 0 0 3 0x14200 bored softnet 76974 197939 0 0 3 0x14200 bored softnet 29680 522759 0 0 3 0x14200 bored softnet 43778 184815 0 0 3 0x14200 bored systqmp 51645 35248 0 0 3 0x14200 bored systq 69795 4684 0 0 2 0x40014200 softclock 69958 251085 0 0 3 0x40014200 idle0 1 189886 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 21591 (syz-executor.4) thread 0xffff800021229930 (513130) exclusive rwlock kmmaplk r = 0 (0xffffffff82dca4c8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5376 #3 uvm_map+0x353 sys/uvm/uvm_map.c:1027 #4 uvm_km_kmemalloc_pla+0x10e sys/uvm/uvm_km.c:348 #5 uvm_uarea_alloc+0x4a sys/uvm/uvm_glue.c:275 #6 thread_fork+0xd6 sys/kern/kern_fork.c:526 #7 sys___tfork+0x13b sys/kern/kern_fork.c:136 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:625 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82c2ca98) #0 witness_lock+0x44d #1 syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline] #1 syscall+0x5cd sys/arch/amd64/amd64/trap.c:625 #2 Xsyscall+0x128 Process 41144 (syz-executor.5) thread 0xffff800021200848 (297787) exclusive rwlock lockflk r = 0 (0xffffffff82bef250) #0 witness_lock+0x44d #1 lf_advlock+0x195 sys/kern/vfs_lockf.c:260 #2 VOP_ADVLOCK+0x71 sys/kern/vfs_vops.c:612 #3 sys_flock+0x1cd #4 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #4 syscall+0x606 sys/arch/amd64/amd64/trap.c:625 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10227 6413K 6421K 78643K 11358 0 pcb 13 16K 18K 78643K 19 0 rtable 248 7K 7K 78643K 2019 0 ifaddr 73 24K 24K 78643K 155 0 sysctl 3 1K 3K 78643K 138 0 counters 60 35K 35K 78643K 86 0 ioctlops 0 0K 2K 78643K 160 0 iov 0 0K 28K 78643K 3265 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1272 80K 80K 78643K 3773 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 241 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 6156 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 26 97K 125K 78643K 14227 0 sigio 0 0K 0K 78643K 1650 0 proc 56 78K 115K 78643K 1610 0 subproc 104 6K 6K 78643K 273 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 966 0 in_multi 99 6K 7K 78643K 458 0 ether_multi 1 0K 0K 78643K 55 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 235 1049K 1049K 78643K 235 0 exec 0 0K 1K 78643K 3012 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 460 95K 538K 78643K 101755 0 UVM aobj 131 4K 5K 78643K 140 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 450 0 NDP 11 0K 2K 78643K 66 0 temp 124 5778K 5906K 78643K 37390 0 kqueue 12 18K 30K 78643K 2661 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 22 0 0 1 0 1 1 0 8 0 rtpcb 120 1500 0 1497 19 16 3 3 0 8 2 rtentry 112 274 0 157 4 0 4 4 0 8 0 unpcb 144 15793 0 15649 117 111 6 10 0 8 0 syncache 296 198 0 198 35 34 1 1 0 8 1 tcpqe 32 110 0 110 28 27 1 1 0 8 1 tcpcb 776 6919 0 6912 172 167 5 14 0 8 3 arp 120 46 0 28 1 0 1 1 0 8 0 ipq 40 125 0 125 10 10 0 1 0 8 0 ipqe 40 436 0 436 10 10 0 1 0 8 0 inpcb 368 24703 0 24693 272 266 6 20 0 8 4 nd6 48 81 0 50 1 0 1 1 0 8 0 kcovpl 48 21 0 13 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1078 0 610 33 3 30 30 0 8 0 art_table 32 1079 0 610 4 0 4 4 0 8 0 art_node 16 273 0 166 1 0 1 1 0 8 0 sysvmsgpl 40 32 0 21 1 0 1 1 0 8 0 semapl 112 6154 0 6144 1 0 1 1 0 8 0 shmpl 112 137 0 9 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 20140 0 18690 92 0 92 92 0 8 0 ffsino 272 20140 0 18690 98 0 98 98 0 8 0 nchpl 144 38654 0 37018 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 134180 0 134180 3 2 1 2 0 8 1 percpumem 16 56 0 13 1 0 1 1 0 8 0 kstatmem 264 48 0 26 2 0 2 2 0 8 0 scxspl 216 118831 0 118831 47 45 2 8 0 8 2 plimitpl 152 3610 0 3587 30 28 2 2 0 8 1 sigapl 424 14496 0 14441 7 0 7 7 0 8 0 futexpl 64 160670 0 160665 2 1 1 1 0 8 0 knotepl 120 863 0 0 11 0 11 11 0 8 0 kqueuepl 216 5389 0 5381 69 64 5 8 0 8 4 pipepl 320 2864 0 2836 73 70 3 11 0 8 0 fdescpl 496 14478 0 14441 7 2 5 6 0 8 0 filepl 152 109759 0 109389 203 186 17 23 0 8 2 lockfpl 104 1783 0 1781 2 1 1 2 0 8 0 lockfspl 48 406 0 404 1 0 1 1 0 8 0 sessionpl 144 36 0 20 1 0 1 1 0 8 0 pgrppl 48 497 0 481 1 0 1 1 0 8 0 ucredpl 104 17331 0 17313 1 0 1 1 0 8 0 zombiepl 144 14441 0 14441 1 0 1 1 0 8 1 processpl 1072 14496 0 14441 5 0 5 5 0 8 0 procpl 696 41810 0 41731 27 18 9 9 0 8 1 sosppl 168 1800 0 1800 8 7 1 1 0 8 1 sockpl 488 43015 0 42856 788 768 20 42 0 8 0 mcl64k 65536 51 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 3 0 3 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 26 0 0 2 0 2 2 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 33 0 0 3 0 3 3 0 8 0 mcl2k2 2112 11 0 0 1 0 1 1 0 8 0 mcl2k 2048 561 0 0 55 26 29 55 0 8 1 mtagpl 96 22 0 0 1 0 1 1 0 8 0 mbufpl 256 4205 0 0 220 0 220 220 0 8 0 bufpl 288 27506 0 21182 453 0 453 453 0 8 0 anonpl 24 3148524 0 3133657 267 155 112 118 0 186 0 amapchunkpl 152 487599 0 486796 2404 2367 37 2227 0 158 5 amappl16 200 38527 0 38107 273 250 23 36 0 8 0 amappl15 192 8 0 8 2 2 0 1 0 8 0 amappl14 184 197 0 184 2 1 1 2 0 8 0 amappl13 176 24 0 23 1 0 1 1 0 8 0 amappl12 168 578 0 574 1 0 1 1 0 8 0 amappl11 160 59 0 47 1 0 1 1 0 8 0 amappl10 152 56 0 44 1 0 1 1 0 8 0 amappl9 144 1105 0 1105 22 21 1 1 0 8 1 amappl8 136 794 0 626 6 0 6 6 0 8 0 amappl7 128 251 0 227 2 0 2 2 0 8 0 amappl6 120 431 0 413 2 1 1 2 0 8 0 amappl5 112 482 0 475 1 0 1 1 0 8 0 amappl4 104 1997 0 1962 2 1 1 2 0 8 0 amappl3 96 44651 0 44583 2 0 2 2 0 8 0 amappl2 88 15629 0 15544 3 1 2 3 0 8 0 amappl1 80 333206 0 332369 27 9 18 26 0 8 0 amappl 88 100445 0 100206 6 0 6 6 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 72 139 0 9 3 0 3 3 0 8 0 uaddrrnd 24 14478 0 14441 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 14478 0 14441 1 0 1 1 0 8 0 vmmpekpl 168 118271 0 118212 4 0 4 4 0 8 0 vmmpepl 168 1346518 0 1343230 349 204 145 155 0 357 2 vmsppl 440 14477 0 14441 5 0 5 5 0 8 0 rwobjpl 56 371787 0 364005 137 25 112 114 0 8 0 pdppl 4096 28963 0 28882 431 350 81 95 0 8 0 pvpl 32 5931133 0 5909612 648 453 195 362 0 265 0 pmappl 248 14477 0 14441 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1676 0 649 30 0 30 30 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace lf_advlock(ffff800000d0e0e0,0,fffffd8066e421e0,8,ffff80002b013898,30) at lf_advlock+0x223 ls_ref sys/kern/vfs_lockf.c:138 [inline] lf_advlock(ffff800000d0e0e0,0,fffffd8066e421e0,8,ffff80002b013898,30) at lf_advlock+0x223 sys/kern/vfs_lockf.c:278 VOP_ADVLOCK(fffffd807d3ff3c0,fffffd8066e421e0,8,ffff80002b013898,30) at VOP_ADVLOCK+0x71 sys/kern/vfs_vops.c:612 sys_flock(ffff800021200848,ffff80002b013918,ffff80002b013960) at sys_flock+0x1cd syscall(ffff80002b0139e0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff80002b0139e0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x37b22f90f00, count: -5 ddb{0}> machine ddbcpu 1