witness: thread exiting with locks held

witness: thread exiting with locks held
Status: closed as dup on 2019/02/21 21:47
Reported-by: syzbot+9938f8e87064d4a6b361@syzkaller.appspotmail.com
First crash: 147d, last: 1h53m

Duplicate of (1):
Title	Repro	Bisected	Count	Last	Reported
witness: userret: returning with the following locks held:	C		202	8h00m	147d

duplicates (2):
Title	Repro	Bisected	Count	Last	Reported	Patched	Status
panic: thread ADDR cannotW ARexNiIt NGw:h ilSPeL h oNlOTdi nLgO WsElReEepD lOoNck sSY			1	144d	144d	0/3	closed as dup on 2019/02/01 06:52
panic: thread ADDR cannot exit while holding sleeplocks	syz		22	119d	148d	0/3	closed as dup on 2019/01/28 21:07

Sample crash report:

login: witness: thread 0xffff800020be5078 exiting with the following locks held:
exclusive rrwlock inode r = 0 (0xfffffd806d38f0a8) locked @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547
panic: thread 0xffff800020be5078 cannot exit while holding sleeplocks
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 269727  25430     73    0x100010          0    0  syslogd
* 26549  44126      0     0x14000      0x200    1  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(c47ebb29993326db) 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{1}> 
ddb{1}> set $lines = 0
ddb{1}> show panic
thread 0xffff800020be5078 cannot exit while holding sleeplocks
ddb{1}> 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(c47ebb29993326db) 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{1}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800020b674f0
rbx               0xffff800020b67590
rdx               0xffffffff81f33250    cy_pio_rec+0x41b4
rcx                            0x201
rax                              0x1
r8                0xffffffff81df7814    kprintf+0x174
r9                               0x1
r10               0x85db9422cdeed693
r11               0xb911823ec3742b12
r12                     0x3000000008
r13               0xffff800020b67500
r14                            0x100
r15                              0x1
rip               0xffffffff8100c2e8    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800020b674e0
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{1}>

All crashes (523):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro
ci-openbsd-multicore	2019/01/29 01:11	openbsd	fabafa7b	aa432daf	.config	log	report	syz
ci-openbsd-multicore	2019/03/05 13:53	openbsd	da8fceb2	3419571c	.config	log	report	syz
ci-openbsd-multicore	2019/02/01 04:50	openbsd	dc36d2c7	aa432daf	.config	log	report	syz
ci-openbsd-setuid	2019/01/30 00:47	openbsd	906b732f	aa432daf	.config	log	report	syz
ci-openbsd-setuid	2019/01/29 21:54	openbsd	81059776	aa432daf	.config	log	report	syz
ci-openbsd-multicore	2019/01/29 20:15	openbsd	81059776	aa432daf	.config	log	report	syz
ci-openbsd-multicore	2019/01/29 18:37	openbsd	81059776	aa432daf	.config	log	report	syz
ci-openbsd-multicore	2019/01/29 13:00	openbsd	81059776	aa432daf	.config	log	report	syz
ci-openbsd-multicore	2019/01/29 11:04	openbsd	81059776	aa432daf	.config	log	report	syz
ci-openbsd-setuid	2019/01/29 08:04	openbsd	fabafa7b	aa432daf	.config	log	report	syz
ci-openbsd-setuid	2019/01/29 07:32	openbsd	fabafa7b	aa432daf	.config	log	report	syz
ci-openbsd-setuid	2019/01/29 01:58	openbsd	fabafa7b	aa432daf	.config	log	report	syz
ci-openbsd-setuid	2019/01/28 21:03	openbsd	fabafa7b	aa432daf	.config	log	report
ci-openbsd-setuid	2019/06/25 16:52	openbsd	d18aa00c	0a8d1a96	.config	log	report
ci-openbsd-multicore	2019/06/25 08:03	openbsd	63bed618	82c13b6b	.config	log	report
ci-openbsd-setuid	2019/06/25 06:25	openbsd	63bed618	82c13b6b	.config	log	report
ci-openbsd-setuid	2019/06/24 08:50	openbsd	23f101f3	472f0082	.config	log	report
ci-openbsd-setuid	2019/06/24 04:47	openbsd	23f101f3	472f0082	.config	log	report
ci-openbsd-setuid	2019/06/24 03:38	openbsd	23f101f3	472f0082	.config	log	report
ci-openbsd-setuid	2019/06/23 21:24	openbsd	50b584e5	3efccdd2	.config	log	report
ci-openbsd-setuid	2019/06/23 10:47	openbsd	50b584e5	34bf9440	.config	log	report
ci-openbsd-setuid	2019/06/22 04:44	openbsd	dcaa94fa	34bf9440	.config	log	report
ci-openbsd-setuid	2019/06/21 20:42	openbsd	25a61275	34bf9440	.config	log	report
ci-openbsd-multicore	2019/06/21 14:45	openbsd	37aad195	34bf9440	.config	log	report
ci-openbsd-multicore	2019/06/21 01:34	openbsd	e8150bce	34bf9440	.config	log	report
ci-openbsd-setuid	2019/06/20 20:55	openbsd	e8150bce	34bf9440	.config	log	report
ci-openbsd-setuid	2019/06/20 14:33	openbsd	e8150bce	34bf9440	.config	log	report
ci-openbsd-setuid	2019/06/20 10:38	openbsd	5b199efb	34bf9440	.config	log	report
ci-openbsd-setuid	2019/06/19 20:01	openbsd	515622fa	34bf9440	.config	log	report
ci-openbsd-setuid	2019/06/19 18:34	openbsd	515622fa	34bf9440	.config	log	report
ci-openbsd-multicore	2019/06/19 10:33	openbsd	515622fa	34bf9440	.config	log	report
ci-openbsd-multicore	2019/06/18 18:54	openbsd	fde7aa10	e3f76baa	.config	log	report
ci-openbsd-setuid	2019/06/18 09:11	openbsd	fde7aa10	e3f76baa	.config	log	report
ci-openbsd-multicore	2019/06/18 03:36	openbsd	ebca5146	442206d7	.config	log	report
ci-openbsd-setuid	2019/06/17 20:29	openbsd	c4e5d4f5	442206d7	.config	log	report
ci-openbsd-setuid	2019/06/17 03:50	openbsd	e327fa4e	442206d7	.config	log	report
ci-openbsd-setuid	2019/06/17 01:05	openbsd	e327fa4e	442206d7	.config	log	report
ci-openbsd-setuid	2019/06/16 15:40	openbsd	b077324a	442206d7	.config	log	report
ci-openbsd-setuid	2019/06/16 11:52	openbsd	b077324a	442206d7	.config	log	report
ci-openbsd-setuid	2019/06/16 00:14	openbsd	6205d5a7	442206d7	.config	log	report
ci-openbsd-setuid	2019/06/15 16:02	openbsd	345f6e55	442206d7	.config	log	report
ci-openbsd-multicore	2019/06/15 00:40	openbsd	513dea04	442206d7	.config	log	report
ci-openbsd-setuid	2019/06/13 22:45	openbsd	55a9f8fc	d25bb7ad	.config	log	report
ci-openbsd-setuid	2019/06/13 18:43	openbsd	55a9f8fc	d25bb7ad	.config	log	report
ci-openbsd-setuid	2019/06/13 06:40	openbsd	9ac7cdfd	3f4e812b	.config	log	report
ci-openbsd-multicore	2019/06/12 11:50	openbsd	56a89001	794a1ad7	.config	log	report
ci-openbsd-setuid	2019/06/12 03:39	openbsd	614db50e	ea2f4006	.config	log	report
ci-openbsd-setuid	2019/06/12 02:36	openbsd	614db50e	ea2f4006	.config	log	report
ci-openbsd-setuid	2019/06/11 11:59	openbsd	2762bfbc	5b5826d0	.config	log	report
ci-openbsd-setuid	2019/06/11 08:53	openbsd	2762bfbc	0159583c	.config	log	report
ci-openbsd-setuid	2019/06/10 23:22	openbsd	85c5a5c1	0159583c	.config	log	report
ci-openbsd-setuid	2019/06/10 09:07	openbsd	806c0a15	0159583c	.config	log	report
ci-openbsd-setuid	2019/06/09 11:03	openbsd	9748e0d2	0159583c	.config	log	report
ci-openbsd-setuid	2019/06/08 09:01	openbsd	432eaf59	cf9c3a50	.config	log	report
ci-openbsd-multicore	2019/06/07 07:20	openbsd	b77fe90e	698773cb	.config	log	report
ci-openbsd-setuid	2019/06/07 06:33	openbsd	b77fe90e	698773cb	.config	log	report
ci-openbsd-multicore	2019/06/06 14:19	openbsd	5304b409	73a7d55b	.config	log	report
ci-openbsd-pf	2019/03/05 12:50	openbsd	da8fceb2	3419571c	.config	log	report