login: panic: vputonfreelist: lock count is not zero Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 195858 20127 0 0 0 1 syz-executor8348 * 73242 45679 0 0 0x4000000 0K syz-executor8348 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8226d206) at panic+0x15c sys/kern/subr_prf.c:207 vputonfreelist(fffffd8079c16840) at vputonfreelist+0x139 sys/kern/vfs_subr.c:711 vn_closefile(fffffd806dbb5d20,ffff800020ae7ae8) at vn_closefile+0xe2 sys/kern/vfs_vnops.c:615 fdrop(fffffd806dbb5d20,ffff800020ae7ae8) at fdrop+0xc2 sys/kern/kern_descrip.c:1276 sys_ftruncate(ffff800020ae7ae8,ffff800020b75018,ffff800020b75060) at sys_ftruncate+0x21f sys/kern/vfs_syscalls.c:2860 syscall(ffff800020b750e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020b750e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd463dd4a710, count: 7 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic vputonfreelist: lock count is not zero ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8226d206) at panic+0x15c sys/kern/subr_prf.c:207 vputonfreelist(fffffd8079c16840) at vputonfreelist+0x139 sys/kern/vfs_subr.c:711 vn_closefile(fffffd806dbb5d20,ffff800020ae7ae8) at vn_closefile+0xe2 sys/kern/vfs_vnops.c:615 fdrop(fffffd806dbb5d20,ffff800020ae7ae8) at fdrop+0xc2 sys/kern/kern_descrip.c:1276 sys_ftruncate(ffff800020ae7ae8,ffff800020b75018,ffff800020b75060) at sys_ftruncate+0x21f sys/kern/vfs_syscalls.c:2860 syscall(ffff800020b750e0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020b750e0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd463dd4a710, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020b74d80 rbx 0xffff800020b74e30 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81fb607f kprintf+0x16f r9 0x1 r10 0xbe2ecbc765fae2bb r11 0xbaa3ab3fcc213999 r12 0x3000000008 r13 0xffff800020b74d90 r14 0x100 r15 0x1 rip 0xffffffff8219a9e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b74d70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor8348) pid=73242 stat=onproc flags process=0 proc=4000000 pri=17, usrpri=60, nice=20 forw=0xffffffffffffffff, list=0xffff800020ae6768,0xffff800020ae6298 process=0xffff800020a9d2e0 user=0xffff800020b70000, vmspace=0xfffffd807f000cf0 estcpu=10, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20127 195858 90740 0 7 0 syz-executor8348 20127 207563 90740 0 3 0x4000080 poll syz-executor8348 45679 485053 91033 0 3 0x80 nanosleep syz-executor8348 45679 355269 91033 0 2 0x4000000 syz-executor8348 45679 153576 91033 0 3 0x4000080 poll syz-executor8348 *45679 73242 91033 0 7 0x4000000 syz-executor8348 45679 239103 91033 0 3 0x4000080 fsleep syz-executor8348 91033 476555 56905 0 3 0x80 nanosleep syz-executor8348 90740 473515 56905 0 3 0x80 nanosleep syz-executor8348 56905 433568 3835 0 3 0x82 nanosleep syz-executor8348 3835 46644 48727 0 3 0x10008a pause ksh 48727 417836 60741 0 3 0x92 select sshd 94830 169206 1 0 3 0x100083 ttyin getty 60741 120297 1 0 3 0x80 select sshd 21999 357243 35443 74 3 0x100092 bpf pflogd 35443 207008 1 0 3 0x80 netio pflogd 68076 381186 10922 73 3 0x100090 kqread syslogd 10922 321445 1 0 3 0x100082 netio syslogd 206 213009 1 77 3 0x100090 poll dhclient 97635 351294 1 0 3 0x80 poll dhclient 18033 156044 0 0 3 0x14200 bored smr 26697 344571 0 0 3 0x14200 pgzero zerothread 50004 325788 0 0 3 0x14200 aiodoned aiodoned 16888 42834 0 0 3 0x14200 syncer update 49430 449639 0 0 3 0x14200 cleaner cleaner 1157 487162 0 0 3 0x14200 reaper reaper 99249 435812 0 0 3 0x14200 pgdaemon pagedaemon 21773 474466 0 0 3 0x14200 bored crynlk 33474 499476 0 0 3 0x14200 bored crypto 30713 511756 0 0 3 0x40014200 acpi0 acpi0 99636 390416 0 0 3 0x40014200 idle1 20609 262663 0 0 3 0x14200 bored softnet 33589 377415 0 0 3 0x14200 bored systqmp 10141 160496 0 0 3 0x14200 bored systq 89076 196263 0 0 3 0x40014200 bored softclock 99376 465301 0 0 3 0x40014200 idle0 1 99157 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 45679 (syz-executor8348) thread 0xffff800020ae7ae8 (73242) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82641eb8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:435 #3 sleep_finish+0x113 sys/kern/kern_synch.c:415 #4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:444 [inline] #4 sleep_finish_all+0x32 sys/kern/kern_synch.c:206 #5 tsleep+0x1cc sys/kern/kern_synch.c:155 #6 biowait+0xa6 sys/kern/vfs_bio.c:1255 #7 bwrite+0x1e4 sys/kern/vfs_bio.c:765 #8 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #9 ffs_truncate+0x285 #10 ufs_setattr+0x6b0 sys/ufs/ufs/ufs_vnops.c:408 #11 VOP_SETATTR+0xc6 sys/kern/vfs_vops.c:229 #12 sys_ftruncate+0x1e0 sys/kern/vfs_syscalls.c:2856 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #14 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9462 6393K 6394K 78643K 10553 0 pcb 13 8K 8K 78643K 13 0 rtable 61 2K 2K 78643K 127 0 ifaddr 29 8K 8K 78643K 30 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1467 0 iov 0 0K 12K 78643K 686 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 1 0K 0K 78643K 1 0 proc 59 63K 71K 78643K 358 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 177 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 70 3K 12K 78643K 2636 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 4 0K 0K 78643K 4 0 temp 24 3009K 3073K 78643K 1666 0 kqueue 2 2K 2K 78643K 2 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 arp 64 2 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 2 2 0 1 0 8 0 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 29 0 23 1 0 1 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 9 0 7 1 0 1 1 0 8 0 pfstkey 112 9 0 7 1 0 1 1 0 8 0 pfstate 328 9 0 7 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 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1402 0 16 45 0 45 45 0 8 0 ffsino 272 1402 0 16 93 0 93 93 0 8 0 nchpl 144 1577 0 34 58 0 58 58 0 8 0 uvmvnodes 72 1412 0 0 26 0 26 26 0 8 0 vnodes 208 1412 0 0 75 0 75 75 0 8 0 namei 1024 4429 0 4429 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4332 0 4331 11 10 1 7 0 8 0 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 424 566 0 534 4 0 4 4 0 8 0 futexpl 56 3113 0 3112 1 0 1 1 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 144 1 0 0 1 0 1 1 0 8 0 pipelkpl 48 751 0 744 2 1 1 1 0 8 0 pipepl 120 1502 0 1490 2 1 1 1 0 8 0 fdescpl 496 551 0 534 3 0 3 3 0 8 0 filepl 152 3022 0 2968 3 0 3 3 0 8 0 lockfpl 104 1377 0 1376 1 0 1 1 0 8 0 lockfspl 48 522 0 521 1 0 1 1 0 8 0 sessionpl 112 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 53 0 44 1 0 1 1 0 8 0 zombiepl 144 534 0 534 2 1 1 1 0 8 1 processpl 960 566 0 534 5 0 5 5 0 8 0 procpl 624 1712 0 1675 4 0 4 4 0 8 0 sockpl 400 73 0 55 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 82 0 0 11 0 11 11 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 119 0 0 7 0 7 7 0 8 0 bufpl 280 2870 0 79 200 0 200 200 0 8 0 anonpl 16 40411 0 39086 13 7 6 11 0 124 0 amapchunkpl 152 3178 0 3126 3 0 3 3 0 158 0 amappl16 192 1170 0 1166 4 3 1 4 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 1 0 1 1 1 0 1 0 8 0 amappl13 168 14 0 13 2 1 1 1 0 8 0 amappl12 160 1 0 1 1 1 0 1 0 8 0 amappl11 152 73 0 55 1 0 1 1 0 8 0 amappl10 144 10 0 8 1 0 1 1 0 8 0 amappl9 136 236 0 235 1 0 1 1 0 8 0 amappl8 128 580 0 574 1 0 1 1 0 8 0 amappl7 120 91 0 83 1 0 1 1 0 8 0 amappl6 112 15 0 15 2 2 0 1 0 8 0 amappl5 104 132 0 118 1 0 1 1 0 8 0 amappl4 96 481 0 455 1 0 1 1 0 8 0 amappl3 88 99 0 93 1 0 1 1 0 8 0 amappl2 80 3907 0 3838 3 1 2 2 0 8 0 amappl1 72 22995 0 22540 16 6 10 16 0 8 0 amappl 80 1902 0 1872 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 551 0 534 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 551 0 534 1 0 1 1 0 8 0 vmmpekpl 168 12462 0 12435 2 0 2 2 0 8 0 vmmpepl 168 57554 0 56570 62 17 45 51 0 357 2 vmsppl 368 550 0 534 2 0 2 2 0 8 0 pdppl 4096 1109 0 1068 6 0 6 6 0 8 0 pvpl 32 121409 0 118244 43 15 28 36 0 265 1 pmappl 232 550 0 534 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 143 0 4 4 0 4 4 0 8 0