panic: thread 0xffff800020b759d0 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 346893 84386 73 0x100010 0 1 syslogd *522596 77371 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x16c sys/kern/subr_prf.c:208 witness_thread_exit(e5f8091e053da05c) at witness_thread_exit+0x244 sys/kern/subr_witness.c:1377 reaper(0) at reaper+0x14f sys/kern/kern_exit.c:412 end trace frame: 0x0, count: 11 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}> show panic thread 0xffff800020b759d0 cannot exit while holding sleeplocks ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399 panic() at panic+0x16c sys/kern/subr_prf.c:208 witness_thread_exit(e5f8091e053da05c) at witness_thread_exit+0x244 sys/kern/subr_witness.c:1377 reaper(0) at reaper+0x14f sys/kern/kern_exit.c:412 end trace frame: 0x0, count: -4 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020b67c60 rbx 0xffff800020b67d00 rdx 0xffffffff81ec88ae cmd0646_9_tim_udma+0x18cbf rcx 0x201 rax 0x1 r8 0xffffffff81aa9b64 kprintf+0x174 r9 0x1 r10 0xbf778cca3a7ab8a8 r11 0x50911d88dae8b4f5 r12 0x3000000008 r13 0xffff800020b67c70 r14 0x100 r15 0x1 rip 0xffffffff819d4fa8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b67c50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (reaper) pid=522596 stat=onproc flags process=14000 proc=200 pri=4, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020b21068,0xffff800020b21c30 process=0xffff800020b5a698 user=0xffff800020b62000, vmspace=0xffffffff822dc6f0 estcpu=1, cpticks=3, pctcpu=0.3 user=0, sys=3, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27461 70570 42669 0 2 0x482 syz-executor0 42669 346025 46585 0 3 0x82 thrsleep syz-execprog 42669 276252 46585 0 3 0x4000082 thrsleep syz-execprog 42669 435798 46585 0 3 0x4000082 thrsleep syz-execprog 42669 332551 46585 0 3 0x4000082 thrsleep syz-execprog 42669 437179 46585 0 3 0x4000082 thrsleep syz-execprog 42669 498371 46585 0 3 0x4000082 thrsleep syz-execprog 42669 118956 46585 0 3 0x4000082 thrsleep syz-execprog 42669 8352 46585 0 3 0x4000082 kqread syz-execprog 42669 251700 46585 0 3 0x4000082 thrsleep syz-execprog 46585 266924 83373 0 3 0x10008a pause ksh 83373 315645 64076 0 3 0x92 select sshd 70483 129533 1 0 3 0x100083 ttyin getty 64076 340238 1 0 3 0x80 select sshd 84386 346893 91604 73 7 0x100010 syslogd 91604 509982 1 0 3 0x100082 netio syslogd 43692 49539 1 77 3 0x100090 poll dhclient 9217 332811 1 0 3 0x80 poll dhclient 12573 199396 0 0 3 0x14200 pgzero zerothread 50204 378933 0 0 3 0x14200 aiodoned aiodoned 89383 168651 0 0 3 0x14200 syncer update 22487 116197 0 0 3 0x14200 cleaner cleaner *77371 522596 0 0 7 0x14200 reaper 81706 375142 0 0 3 0x14200 pgdaemon pagedaemon 12748 258197 0 0 3 0x14200 bored crynlk 38754 89253 0 0 3 0x14200 bored crypto 69424 310246 0 0 3 0x40014200 acpi0 acpi0 48536 48143 0 0 3 0x40014200 idle1 8304 22015 0 0 3 0x14200 bored softnet 47265 430164 0 0 3 0x14200 bored systqmp 99193 417296 0 0 3 0x14200 bored systq 30538 177099 0 0 3 0x40014200 bored softclock 34091 167531 0 0 3 0x40014200 idle0 1 233531 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 84386 (syslogd) thread 0xffff800020be5780 (346893) exclusive rrwlock inode r = 0 (0xfffffd806eb9a098) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9449 6318K 6318K 78643K 10536 0 0 pcb 23 9K 9K 78643K 55 0 0 rtable 79 2K 2K 78643K 141 0 0 ifaddr 28 8K 8K 78643K 28 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 14 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1166 73K 73K 78643K 1174 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0