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: 86d, last: 21h26m

Duplicate of (1):
Title	Repro	Bisected	Count	Last	Reported
witness: userret: returning with the following locks held:	C		128	3h44m	86d

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	83d	83d	0/3	closed as dup on 2019/02/01 06:52
panic: thread ADDR cannot exit while holding sleeplocks	syz		22	58d	87d	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 (411):
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	2019/04/24 17:38	openbsd	40247284	8e3c52b1	.config	log	report
ci-openbsd-setuid	2019/04/24 11:20	openbsd	61b6b4dc	0766ce61	.config	log	report
ci-openbsd-setuid	2019/04/24 05:22	openbsd	61b6b4dc	0766ce61	.config	log	report
ci-openbsd-setuid	2019/04/23 22:43	openbsd	83c38845	2398edea	.config	log	report
ci-openbsd-multicore	2019/04/23 20:04	openbsd	83c38845	2398edea	.config	log	report
ci-openbsd-multicore	2019/04/23 04:29	openbsd	4ef5c25b	53199d6e	.config	log	report
ci-openbsd-setuid	2019/04/22 15:59	openbsd	1afff35c	0a77c33c	.config	log	report
ci-openbsd-multicore	2019/04/21 23:10	openbsd	00740c5d	b0e8efcb	.config	log	report
ci-openbsd-setuid	2019/04/20 22:15	openbsd	e2502dba	b0e8efcb	.config	log	report
ci-openbsd-setuid	2019/04/19 17:15	openbsd	288b7a5c	b0e8efcb	.config	log	report
ci-openbsd-setuid	2019/04/19 12:31	openbsd	288b7a5c	b0e8efcb	.config	log	report
ci-openbsd-multicore	2019/04/18 21:42	openbsd	04c37fad	b0e8efcb	.config	log	report
ci-openbsd-multicore	2019/04/18 17:17	openbsd	04c37fad	b0e8efcb	.config	log	report
ci-openbsd-setuid	2019/04/18 02:58	openbsd	e317cf7e	b0e8efcb	.config	log	report
ci-openbsd-setuid	2019/04/17 15:58	openbsd	e317cf7e	b0e8efcb	.config	log	report
ci-openbsd-setuid	2019/04/16 17:23	openbsd	f356787b	505ab413	.config	log	report
ci-openbsd-setuid	2019/04/16 01:36	openbsd	22f3d038	505ab413	.config	log	report
ci-openbsd-setuid	2019/04/15 21:52	openbsd	c87f73dd	505ab413	.config	log	report
ci-openbsd-setuid	2019/04/15 15:58	openbsd	c87f73dd	505ab413	.config	log	report
ci-openbsd-setuid	2019/04/15 02:17	openbsd	62444805	505ab413	.config	log	report
ci-openbsd-setuid	2019/04/14 22:22	openbsd	62444805	505ab413	.config	log	report
ci-openbsd-multicore	2019/04/14 19:07	openbsd	62302bca	505ab413	.config	log	report
ci-openbsd-setuid	2019/04/14 17:56	openbsd	62302bca	505ab413	.config	log	report
ci-openbsd-setuid	2019/04/11 11:08	openbsd	f3736a26	e955ac50	.config	log	report
ci-openbsd-setuid	2019/04/11 08:57	openbsd	f3736a26	e955ac50	.config	log	report
ci-openbsd-multicore	2019/04/11 05:34	openbsd	f3736a26	e955ac50	.config	log	report
ci-openbsd-multicore	2019/04/10 07:06	openbsd	41dd9580	65b612b7	.config	log	report
ci-openbsd-setuid	2019/04/08 09:54	openbsd	e4c7564c	c34fde03	.config	log	report
ci-openbsd-setuid	2019/04/07 13:58	openbsd	bb051d67	c34fde03	.config	log	report
ci-openbsd-setuid	2019/04/07 12:31	openbsd	bb051d67	c34fde03	.config	log	report
ci-openbsd-setuid	2019/04/07 09:25	openbsd	bb051d67	c34fde03	.config	log	report
ci-openbsd-multicore	2019/04/06 13:07	openbsd	724ae923	c34fde03	.config	log	report
ci-openbsd-multicore	2019/04/04 21:05	openbsd	ce5323be	6a475fff	.config	log	report
ci-openbsd-setuid	2019/04/04 09:40	openbsd	1c3d4160	6a475fff	.config	log	report
ci-openbsd-setuid	2019/04/04 04:29	openbsd	5bc82f07	d6fc4177	.config	log	report
ci-openbsd-setuid	2019/04/03 16:16	openbsd	5bc82f07	dfd3394d	.config	log	report
ci-openbsd-setuid	2019/04/02 14:14	openbsd	5bc82f07	dfd3394d	.config	log	report
ci-openbsd-setuid	2019/04/02 08:39	openbsd	e8e42339	a9ca43d4	.config	log	report
ci-openbsd-setuid	2019/04/02 03:17	openbsd	e8e42339	a9ca43d4	.config	log	report
ci-openbsd-setuid	2019/04/01 16:05	openbsd	4abb65b9	36b433b7	.config	log	report
ci-openbsd-setuid	2019/04/01 13:55	openbsd	4abb65b9	36b433b7	.config	log	report
ci-openbsd-setuid	2019/03/31 20:05	openbsd	de3d60f8	0c624d4d	.config	log	report
ci-openbsd-pf	2019/03/05 12:50	openbsd	da8fceb2	3419571c	.config	log	report