Warning: Permanently added '10.128.0.226' (ECDSA) to the list of known hosts. 2019/01/24 22:09:39 parsed 1 programs 2019/01/24 22:09:44 executed programs: 0 userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd80789783d8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *119753 37049 0 0 0x4000000 0 syz-executor1 209962 85747 73 0x100010 0 1 syslogd db_enter() at db_enter+0x18 panic() at panic+0x16c witness_warn(cadb98f1c91e21ba,0,ffff800020b74968) at witness_warn+0x6e0 userret(3c21a35af6489f9a) at userret+0x361 syscall(fd2ab0acf5460585) at syscall+0x680 Xsyscall(6,5,c,0,3,e2e9a1ef010) at Xsyscall+0x128 end of kernel end trace frame: 0xe317334d4f0, count: 9 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 witness_warn ddb{0}> trace db_enter() at db_enter+0x18 panic() at panic+0x16c witness_warn(cadb98f1c91e21ba,0,ffff800020b74968) at witness_warn+0x6e0 userret(3c21a35af6489f9a) at userret+0x361 syscall(fd2ab0acf5460585) at syscall+0x680 Xsyscall(6,5,c,0,3,e2e9a1ef010) at Xsyscall+0x128 end of kernel end trace frame: 0xe317334d4f0, count: -6 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020c76e20 rbx 0xffff800020c76ec0 rdx 0xffffffff81f2ec1b cy_pio_rec+0x1a98 rcx 0x201 rax 0x1 r8 0xffffffff817cef24 kprintf+0x174 r9 0x1 r10 0x25bea980596ebfc4 r11 0xc3de5ca57750275a r12 0x3000000008 r13 0xffff800020c76e30 r14 0x100 r15 0x1 rip 0xffffffff81a668f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020c76e10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor1) pid=119753 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff800020b74bc0,0xffff800020be5088 process=0xffff800020b94010 user=0xffff800020c72000, vmspace=0xfffffd807f00d9d8 estcpu=4, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 88854 429231 91071 0 2 0 syz-executor0 88854 243520 91071 0 3 0x4000000 inode syz-executor0 88854 306899 91071 0 3 0x4000000 inode syz-executor0 37049 350866 75241 0 2 0 syz-executor1 *37049 119753 75241 0 7 0x4000000 syz-executor1 37049 186758 75241 0 2 0x4000000 syz-executor1 37049 264204 75241 0 2 0x4000000 syz-executor1 75241 458076 72987 0 2 0x2 syz-executor1 91071 372853 72987 0 3 0x82 nanosleep syz-executor0 72987 120312 33718 0 3 0x82 kqread syz-execprog 72987 496301 33718 0 3 0x4000082 thrsleep syz-execprog 72987 117081 33718 0 3 0x4000082 thrsleep syz-execprog 72987 448942 33718 0 3 0x4000082 thrsleep syz-execprog 72987 45731 33718 0 3 0x4000082 thrsleep syz-execprog 72987 107379 33718 0 3 0x4000082 thrsleep syz-execprog 72987 498958 33718 0 3 0x4000082 thrsleep syz-execprog 72987 419071 33718 0 3 0x4000082 thrsleep syz-execprog 72987 91398 33718 0 3 0x4000082 thrsleep syz-execprog 33718 73431 55525 0 3 0x10008a pause ksh 55525 26560 76739 0 3 0x92 select sshd 33487 267572 1 0 3 0x100083 ttyin getty 76739 32717 1 0 3 0x80 select sshd 85747 209962 99289 73 7 0x100010 syslogd 99289 352259 1 0 3 0x100082 netio syslogd 97760 520754 1 77 3 0x100090 poll dhclient 41528 53924 1 0 3 0x80 poll dhclient 68149 98149 0 0 2 0x14200 zerothread 19277 67817 0 0 3 0x14200 aiodoned aiodoned 39234 168189 0 0 3 0x14200 syncer update 86563 171594 0 0 3 0x14200 cleaner cleaner 68833 515081 0 0 3 0x14200 reaper reaper 106 239641 0 0 3 0x14200 pgdaemon pagedaemon 48372 393196 0 0 3 0x14200 bored crynlk 93557 461996 0 0 3 0x14200 bored crypto 95528 64795 0 0 3 0x40014200 acpi0 acpi0 31345 314364 0 0 3 0x40014200 idle1 69104 461438 0 0 3 0x14200 bored softnet 76318 428710 0 0 3 0x14200 bored systqmp 86898 363916 0 0 3 0x14200 bored systq 13346 199465 0 0 2 0x40014200 softclock 99791 69668 0 0 3 0x40014200 idle0 1 155162 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}>