| TITLE: witness: thread exiting with locks held |
| |
| witness: thread 0xffff800020bba4c8 exiting with the following locks held: |
| exclusive rrwlock inode r = 0 (0xfffffd806747bc48) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547 |
| panic: Thread 0xffff800020b92720 cannot exit while holding sleeplocks |
| |
| Stopped at db_enter+0x18: addq $0x8,%rsp |
| TID PID UID PRFLAGS PFLAGS CPU COMMAND |
| 333692 13365 73 0x100010 0 1K syslogd |
| *482899 71 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(11493cd476f78d7c) 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 0xffff800020b92720 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(11493cd476f78d7c) 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 0xffff800020b67ad0 |
| rbx 0xffff800020b67b70 |
| rdx 0xffffffff81ec577a cmd0646_9_tim_udma+0x16395 |
| rcx 0 |
| rax 0 |
| r8 0xffffffff81788154 kprintf+0x174 |
| r9 0x1 |
| r10 0x6f534a22035bc4ca |
| r11 0x6db44f275a450c3a |
| r12 0x3000000008 |
| r13 0xffff800020b67ae0 |
| r14 0x100 |
| r15 0x1 |
| rip 0xffffffff81107618 db_enter+0x18 |
| cs 0x8 |
| rflags 0x246 |
| rsp 0xffff800020b67ac0 |
| ss 0x10 |
| db_enter+0x18: addq $0x8,%rsp |
| ddb{0}> show proc |
| PROC (reaper) pid=482899 stat=onproc |
| flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM> |
| pri=4, usrpri=51, nice=20 |
| forw=0xffffffffffffffff, list=0xffff800020b20e10,0xffff800020b21c30 |
| process=0xffff800020b5b070 user=0xffff800020b62000, vmspace=0xffffffff822fc8c0 |
| estcpu=1, cpticks=3, pctcpu=0.15 |
| user=0, sys=3, intr=0 |
| ddb{0}> ps |
| PID TID PPID UID S FLAGS WAIT COMMAND |
| 95915 250426 7524 32767 2 0x490 syz-executor1 |
| 7524 125781 33554 0 3 0x82 wait syz-executor1 |
| 81310 477266 28796 32767 2 0x490 syz-executor0 |
| 28796 145672 33554 0 3 0x82 wait syz-executor0 |
| 53135 361876 0 0 3 0x14200 bored sosplice |
| 33554 404063 25047 0 3 0x82 thrsleep syz-fuzzer |
| 33554 88446 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 460070 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 345337 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 149986 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 42230 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 60955 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 38186 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 513288 25047 0 3 0x4000082 kqread syz-fuzzer |
| 33554 493206 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 517119 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 33554 347325 25047 0 3 0x4000082 thrsleep syz-fuzzer |
| 25047 172199 97313 0 3 0x10008a pause ksh |
| 97313 470341 49628 0 3 0x92 select sshd |
| 26148 337889 1 0 3 0x100083 ttyin getty |
| 49628 220902 1 0 3 0x80 select sshd |
| 13365 333692 4722 73 7 0x100010 syslogd |
| 4722 364223 1 0 3 0x100082 netio syslogd |
| 8296 330563 1 77 3 0x100090 poll dhclient |
| 95260 270278 1 0 3 0x80 poll dhclient |
| 89557 94184 0 0 3 0x14200 pgzero zerothread |
| 64715 61906 0 0 3 0x14200 aiodoned aiodoned |
| 25392 229747 0 0 3 0x14200 syncer update |
| 63748 85883 0 0 3 0x14200 cleaner cleaner |
| * 71 482899 0 0 7 0x14200 reaper |
| 56311 139753 0 0 3 0x14200 pgdaemon pagedaemon |
| 83328 272899 0 0 3 0x14200 bored crynlk |
| 2399 230600 0 0 3 0x14200 bored crypto |
| 36220 506735 0 0 3 0x40014200 acpi0 acpi0 |
| 717 437876 0 0 3 0x40014200 idle1 |
| 87882 394549 0 0 3 0x14200 bored softnet |
| 92791 451998 0 0 3 0x14200 bored systqmp |
| 43113 79354 0 0 3 0x14200 bored systq |
| 30693 248390 0 0 2 0x40014200 softclock |
| 29249 207353 0 0 3 0x40014200 idle0 |
| 1 427078 0 0 3 0x82 wait init |
| 0 0 -1 0 3 0x10200 scheduler swapper |
