Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. 2019/01/28 19:45:36 parsed 1 programs 2019/01/28 19:45:41 executed programs: 0 2019/01/28 19:45:46 executed programs: 95 witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd807aafe4e8) locked @ /syzkaller/managers/setuid/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 * 6943 48503 32767 0x1010 0x4080000 1 syz-executor0 db_enter() at db_enter+0x18 panic() at panic+0x16c witness_warn(b08633fb97c7142b,0,ffff800020b92bd0) at witness_warn+0x700 userret(66bf01255f9546af) at userret+0x361 syscall(36f531b916307af0) at syscall+0x680 Xsyscall(6,0,ffffffffffffffb9,0,3,a8036c89010) at Xsyscall+0x128 end of kernel end trace frame: 0xa82d3dedcb0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> show panic witness_warn ddb{1}> trace db_enter() at db_enter+0x18 panic() at panic+0x16c witness_warn(b08633fb97c7142b,0,ffff800020b92bd0) at witness_warn+0x700 userret(66bf01255f9546af) at userret+0x361 syscall(36f531b916307af0) at syscall+0x680 Xsyscall(6,0,ffffffffffffffb9,0,3,a8036c89010) at Xsyscall+0x128 end of kernel end trace frame: 0xa82d3dedcb0, count: -6 ddb{1}>