kernel: protection fault trap, code=0 Stopped at lf_advlock+0x227: 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(ffff800000cf8620,0,fffffd80661c4690,8,ffff8000212754f8,30) at lf_advlock+0x227 ls_ref sys/kern/vfs_lockf.c:138 [inline] lf_advlock(ffff800000cf8620,0,fffffd80661c4690,8,ffff8000212754f8,30) at lf_advlock+0x227 sys/kern/vfs_lockf.c:278 VOP_ADVLOCK(fffffd805a7047e8,fffffd80661c4690,8,ffff8000212754f8,30) at VOP_ADVLOCK+0x75 sys/kern/vfs_vops.c:612 sys_flock(ffff800021268608,ffff800021275570,ffff8000212755c0) at sys_flock+0x1d1 syscall(ffff800021275640) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021275640) at syscall+0x606 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x566d3760f70, count: -5 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800021275440 rbx 0xdeadbeefdeadbeef rdx 0 rcx 0x5 rax 0xffff800021268608 r8 0xffff8000212754f8 r9 0x30 r10 0 r11 0xad0b54061db4ecc r12 0xffff800000cf8620 r13 0x8 r14 0xffff8000212754f8 r15 0 rip 0xffffffff81e8dc07 lf_advlock+0x227 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000212753a0 ss 0x10 lf_advlock+0x227: addl $0x1,0x28(%rbx) ddb{0}> show proc PROC (syz-executor.1) pid=163078 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800021269bc8,0xffffffff82d78d38 process=0xffff80002959ee28 user=0xffff800021270000, vmspace=0xfffffd80089fe570 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 22968 84047 65006 32767 3 0x90 nanoslp syz-executor.1 22968 477906 65006 32767 3 0x4000090 fsleep syz-executor.1 *22968 163078 65006 32767 7 0x4000010 syz-executor.1 65006 69246 36988 32767 3 0x90 nanoslp syz-executor.1 36988 273967 76435 0 3 0x82 wait syz-executor.1 41845 267705 76627 32767 7 0x10 syz-executor.0 76627 41216 76435 0 3 0x82 wait syz-executor.0 74397 335996 32489 32767 3 0x10 biowait syz-executor.2 32489 70248 76435 0 3 0x82 wait syz-executor.2 11416 321679 30018 32767 3 0x10 biowait syz-executor.3 30018 371173 76435 0 3 0x82 wait syz-executor.3 50059 419458 52831 32767 3 0x90 piperd syz-executor.6 52831 182243 76435 0 3 0x82 wait syz-executor.6 52418 417951 0 0 3 0x14200 bored sosplice 80449 222204 57811 32767 3 0x90 piperd syz-executor.7 57811 451605 76435 0 3 0x82 wait syz-executor.7 24346 236725 34416 32767 2 0x10 syz-executor.5 34416 494380 76435 0 3 0x82 wait syz-executor.5 23607 422582 98247 32767 3 0x90 piperd syz-executor.4 98247 384611 76435 0 3 0x82 wait syz-executor.4 76435 462833 1232 0 3 0x82 wait syz-fuzzer 76435 178366 1232 0 3 0x4000082 nanoslp syz-fuzzer 76435 464777 1232 0 3 0x4000082 wait syz-fuzzer 76435 47079 1232 0 3 0x4000082 wait syz-fuzzer 76435 514318 1232 0 3 0x4000082 thrsleep syz-fuzzer 76435 426309 1232 0 3 0x4000082 thrsleep syz-fuzzer 76435 130370 1232 0 3 0x4000082 thrsleep syz-fuzzer 76435 159877 1232 0 3 0x4000082 thrsleep syz-fuzzer 76435 7912 1232 0 3 0x4000082 wait syz-fuzzer 76435 444777 1232 0 3 0x4000082 thrsleep syz-fuzzer 76435 119335 1232 0 3 0x4000082 thrsleep syz-fuzzer 76435 253690 1232 0 2 0x4000082 syz-fuzzer 76435 17480 1232 0 3 0x4000082 wait syz-fuzzer 76435 168307 1232 0 3 0x4000082 wait syz-fuzzer 76435 165087 1232 0 3 0x4000082 wait syz-fuzzer 76435 41488 1232 0 3 0x4000082 wait syz-fuzzer 1232 144911 86009 0 3 0x10008a sigsusp ksh 86009 388371 75928 0 3 0x9a kqread sshd 90640 356896 1 0 3 0x100083 ttyin getty 75928 384173 1 0 3 0x88 kqread sshd 86785 335311 76647 73 3 0x1100090 kqread syslogd 76647 416563 1 0 3 0x100082 netio syslogd 88418 413692 1 0 3 0x100080 kqread resolvd 46760 65563 62174 77 3 0x100092 kqread dhcpleased 66222 50458 62174 77 3 0x100092 kqread dhcpleased 62174 158921 1 0 3 0x80 kqread dhcpleased 64596 233530 0 0 3 0x14200 bored smr 87230 342311 0 0 3 0x14200 pgzero zerothread 86503 83131 0 0 3 0x14200 aiodoned aiodoned 39615 424375 0 0 3 0x14200 syncer update 46005 291756 0 0 3 0x14200 cleaner cleaner 70282 386318 0 0 3 0x14200 reaper reaper 36510 194736 0 0 3 0x14200 pgdaemon pagedaemon 53010 175788 0 0 3 0x14200 bored viomb 97349 471219 0 0 3 0x40014200 acpi0 acpi0 43881 343035 0 0 3 0x40014200 idle1 56394 396119 0 0 3 0x14200 bored softnet3 93519 84476 0 0 3 0x14200 bored softnet2 88217 202597 0 0 3 0x14200 bored softnet1 19872 281334 0 0 3 0x14200 bored softnet0 7729 521958 0 0 3 0x14200 bored systqmp 52761 90464 0 0 3 0x14200 bored systq 88234 523658 0 0 2 0x40014200 softclock 28265 141138 0 0 3 0x40014200 idle0 1 260822 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 22968 (syz-executor.1) thread 0xffff800021268608 (163078) exclusive rwlock lockflk r = 0 (0xffffffff82bec7a0) #0 witness_lock+0x44d #1 lf_advlock+0x199 sys/kern/vfs_lockf.c:260 #2 VOP_ADVLOCK+0x75 sys/kern/vfs_vops.c:612 #3 sys_flock+0x1d1 #4 syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] #4 syscall+0x606 sys/arch/amd64/amd64/trap.c:632 #5 Xsyscall+0x128 Process 74397 (syz-executor.2) thread 0xffff800021288860 (335996) exclusive rrwlock inode r = 0 (0xfffffd8064f331b0) #0 witness_lock+0x44d #1 rw_enter+0x3e5 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8f sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1324 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6f5 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1848 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:632 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e4ee2c0) #0 witness_lock+0x44d #1 rw_enter+0x3e5 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8f sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1848 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:632 #9 Xsyscall+0x128 Process 11416 (syz-executor.3) thread 0xffff80002126f338 (321679) exclusive rrwlock inode r = 0 (0xfffffd8064f332c0) #0 witness_lock+0x44d #1 rw_enter+0x3e5 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8f sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x200 sys/kern/vfs_subr.c:676 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1324 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6f5 sys/kern/vfs_lookup.c:566 #11 namei+0x55a sys/kern/vfs_lookup.c:250 #12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1848 #13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:632 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8065ece3c8) #0 witness_lock+0x44d #1 rw_enter+0x3e5 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8f sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418 #6 namei+0x55a sys/kern/vfs_lookup.c:250 #7 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1848 #8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline] #8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:632 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10201 6410K 6419K 78643K 11319 0 pcb 13 12K 14K 78643K 17 0 rtable 242 6K 7K 78643K 1431 0 ifaddr 73 24K 24K 78643K 131 0 sysctl 3 1K 3K 78643K 9 0 counters 60 35K 35K 78643K 78 0 ioctlops 0 0K 2K 78643K 70 0 iov 0 0K 44K 78643K 1819 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1279 80K 80K 78643K 3936 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 165 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 2695 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 19 69K 121K 78643K 12221 0 sigio 0 0K 0K 78643K 423 0 proc 56 78K 103K 78643K 1547 0 subproc 104 6K 6K 78643K 221 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1810 0 in_multi 99 6K 7K 78643K 789 0 ether_multi 1 0K 0K 78643K 26 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 199 890K 890K 78643K 199 0 exec 0 0K 1K 78643K 2033 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 418 93K 539K 78643K 123161 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 239 0 NDP 11 0K 2K 78643K 54 0 temp 124 5866K 5994K 78643K 32045 0 kqueue 12 18K 28K 78643K 1196 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 1170 0 1167 18 17 1 5 0 8 0 rtentry 112 229 0 115 4 0 4 4 0 8 0 unpcb 144 24279 0 24266 106 100 6 10 0 8 5 syncache 296 120 0 120 24 23 1 1 0 8 1 tcpqe 32 110 0 110 19 19 0 1 0 8 0 tcpcb 776 4917 0 4911 149 140 9 15 0 8 8 arp 120 39 0 20 1 0 1 1 0 8 0 ipq 40 19 0 18 7 6 1 1 0 8 0 ipqe 40 199 0 198 7 6 1 1 0 8 0 inpcb 368 11222 0 11210 169 159 10 19 0 8 8 ip6q 72 10 0 10 4 4 0 1 0 8 0 ip6af 40 25 0 25 4 4 0 1 0 8 0 nd6 136 67 0 40 2 1 1 2 0 8 0 kcovpl 48 17 0 9 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 921 0 459 30 0 30 30 0 8 1 art_table 32 922 0 459 4 0 4 4 0 8 0 art_node 16 228 0 124 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 2692 0 2682 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 17809 0 16351 92 0 92 92 0 8 0 ffsino 272 17809 0 16351 98 0 98 98 0 8 0 nchpl 144 33799 0 32163 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 116466 0 116466 5 4 1 2 0 8 1 percpumem 16 52 0 9 1 0 1 1 0 8 0 kstatmem 264 40 0 18 2 0 2 2 0 8 0 scxspl 216 101051 0 101049 30 27 3 8 0 8 2 plimitpl 152 2301 0 2278 20 19 1 2 0 8 0 sigapl 424 12488 0 12439 7 0 7 7 0 8 0 futexpl 64 110092 0 110091 4 3 1 1 0 8 0 knotepl 120 517 0 0 7 1 6 7 0 8 0 kqueuepl 216 4076 0 4068 61 56 5 5 0 8 4 pipepl 320 3547 0 3518 87 79 8 17 0 8 5 fdescpl 496 12470 0 12440 7 2 5 6 0 8 0 filepl 152 95390 0 95150 150 135 15 26 0 8 5 lockfpl 104 1281 0 1279 3 2 1 2 0 8 0 lockfspl 48 318 0 316 1 0 1 1 0 8 0 sessionpl 144 32 0 16 1 0 1 1 0 8 0 pgrppl 48 461 0 445 1 0 1 1 0 8 0 ucredpl 104 15297 0 15279 1 0 1 1 0 8 0 zombiepl 144 12440 0 12439 1 0 1 1 0 8 0 processpl 1072 12488 0 12439 5 1 4 5 0 8 0 procpl 696 34890 0 34824 25 16 9 9 0 8 1 sosppl 168 207 0 207 19 18 1 1 0 8 1 sockpl 488 36980 0 36955 622 602 20 35 0 8 16 mcl64k 65536 30 0 0 3 0 3 3 0 8 0 mcl16k 16384 33 0 0 5 2 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 26 0 0 3 0 3 3 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 9 0 0 1 0 1 1 0 8 0 mcl2k 2048 389 0 0 37 12 25 37 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 6837 0 0 423 0 423 423 0 8 0 bufpl 288 21946 0 15634 453 1 452 452 0 8 0 anonpl 24 1346400 0 1333797 232 126 106 113 0 186 8 amapchunkpl 152 589675 0 588849 2320 2280 40 2233 0 158 1 amappl16 200 30636 0 30285 202 175 27 32 0 8 8 amappl15 192 13 0 12 1 0 1 1 0 8 0 amappl14 184 177 0 162 2 1 1 2 0 8 0 amappl13 176 19 0 19 3 3 0 1 0 8 0 amappl12 168 13215 0 13183 2 0 2 2 0 8 0 amappl11 160 58 0 47 1 0 1 1 0 8 0 amappl10 152 42 0 32 1 0 1 1 0 8 0 amappl9 144 280 0 280 15 15 0 2 0 8 0 amappl8 136 702 0 544 6 0 6 6 0 8 0 amappl7 128 182 0 162 1 0 1 1 0 8 0 amappl6 120 434 0 414 2 1 1 2 0 8 0 amappl5 112 422 0 415 1 0 1 1 0 8 0 amappl4 104 1023 0 979 3 1 2 3 0 8 0 amappl3 96 76004 0 75928 11 8 3 4 0 8 0 amappl2 88 13345 0 13274 4 2 2 3 0 8 0 amappl1 80 51574 0 51064 22 9 13 22 0 8 0 amappl 88 122151 0 121923 7 0 7 7 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 12470 0 12440 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 12470 0 12440 1 0 1 1 0 8 0 vmmpekpl 168 103630 0 103570 3 0 3 3 0 8 0 vmmpepl 168 735580 0 733250 247 115 132 132 0 357 17 vmsppl 464 12469 0 12440 7 2 5 6 0 8 0 rwobjpl 56 190831 0 183342 132 22 110 110 0 8 0 pdppl 4096 24948 0 24880 402 320 82 94 0 8 14 pvpl 32 3711622 0 3693261 525 327 198 354 0 265 24 pmappl 248 12469 0 12440 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1730 0 500 36 0 36 36 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace lf_advlock(ffff800000cf8620,0,fffffd80661c4690,8,ffff8000212754f8,30) at lf_advlock+0x227 ls_ref sys/kern/vfs_lockf.c:138 [inline] lf_advlock(ffff800000cf8620,0,fffffd80661c4690,8,ffff8000212754f8,30) at lf_advlock+0x227 sys/kern/vfs_lockf.c:278 VOP_ADVLOCK(fffffd805a7047e8,fffffd80661c4690,8,ffff8000212754f8,30) at VOP_ADVLOCK+0x75 sys/kern/vfs_vops.c:612 sys_flock(ffff800021268608,ffff800021275570,ffff8000212755c0) at sys_flock+0x1d1 syscall(ffff800021275640) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline] syscall(ffff800021275640) at syscall+0x606 sys/arch/amd64/amd64/trap.c:632 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x566d3760f70, count: -5 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 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+0xf sys/dev/kcov.c:144 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7afc65d9f330, count: -5