general protection fault in __queue

general protection fault in __queue_work (2)
Status: upstream: reported C repro on 2020/03/07 03:55
Reported-by: syzbot+889cc963ed79ee90f74f@syzkaller.appspotmail.com
First crash: 88d, last: 60d

Cause bisection: introduced by (bisect log):

commit 29dab2122492f6dbc0b895ca5bd047e166684d1a
Author: Dan Schatzberg <schatzberg.dan@gmail.com>
Date: Tue Feb 25 04:14:07 2020 +0000

loop: use worker per cgroup instead of kworker

Crash: general protection fault in __loop_clr_fd (log)
Repro: C syz .config

similar bugs (1):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	general protection fault in __queue_work			3	454d	453d	0/17	auto-closed as invalid on 2019/09/02 09:35

Sample crash report:

general protection fault, probably for non-canonical address 0xdffffc0000000030: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000180-0x0000000000000187]
CPU: 1 PID: 10611 Comm: blkid Not tainted 5.6.0-rc3-next-20200228-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__queue_work+0xe8/0x1280 kernel/workqueue.c:1409
Code: c6 00 bf 97 89 4c 89 e7 e8 15 14 48 02 49 8d 86 80 01 00 00 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 94 0e 00 00 41 8b 9e 80 01 00
RSP: 0018:ffffc900036d7078 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000040 R08: ffff888093d4e600 R09: fffffbfff18fc846
R10: fffffbfff18fc845 R11: ffffffff8c7e422b R12: ffff88809e869918
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040
FS:  00007f7a68940740(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a682bef44 CR3: 00000000a89b1000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 queue_work_on+0x18b/0x200 kernel/workqueue.c:1515
 queue_work include/linux/workqueue.h:507 [inline]
 loop_queue_work drivers/block/loop.c:984 [inline]
 loop_queue_rq+0x5ac/0x1050 drivers/block/loop.c:2038
 blk_mq_dispatch_rq_list+0x997/0x17f0 block/blk-mq.c:1246
 blk_mq_do_dispatch_sched+0x188/0x3f0 block/blk-mq-sched.c:115
 blk_mq_sched_dispatch_requests+0x3cd/0x650 block/blk-mq-sched.c:211
 __blk_mq_run_hw_queue+0x1b8/0x2c0 block/blk-mq.c:1382
 __blk_mq_delay_run_hw_queue+0x522/0x5e0 block/blk-mq.c:1459
 blk_mq_run_hw_queue+0x16c/0x2f0 block/blk-mq.c:1512
 blk_mq_sched_insert_requests+0x2d4/0x5f0 block/blk-mq-sched.c:444
 blk_mq_flush_plug_list+0x452/0x880 block/blk-mq.c:1758
 blk_flush_plug_list+0x2ff/0x460 block/blk-core.c:1772
 blk_finish_plug block/blk-core.c:1789 [inline]
 blk_finish_plug+0x50/0x97 block/blk-core.c:1785
 read_pages+0x125/0x610 mm/readahead.c:142
 __do_page_cache_readahead+0x47c/0x570 mm/readahead.c:212
 force_page_cache_readahead+0x1dc/0x320 mm/readahead.c:243
 page_cache_sync_readahead mm/readahead.c:522 [inline]
 page_cache_sync_readahead+0x4b8/0x520 mm/readahead.c:509
 generic_file_buffered_read mm/filemap.c:2029 [inline]
 generic_file_read_iter+0x1650/0x2a40 mm/filemap.c:2302
 blkdev_read_iter+0x11b/0x180 fs/block_dev.c:2039
 call_read_iter include/linux/fs.h:1895 [inline]
 new_sync_read+0x4a2/0x790 fs/read_write.c:414
 __vfs_read+0xc9/0x100 fs/read_write.c:427
 vfs_read+0x1ea/0x430 fs/read_write.c:461
 ksys_read+0x127/0x250 fs/read_write.c:587
 do_syscall_64+0xf6/0x790 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f7a68248310
Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24
RSP: 002b:00007ffec73d2ee8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000080f0000 RCX: 00007f7a68248310
RDX: 0000000000000040 RSI: 00000000012dac58 RDI: 0000000000000003
RBP: 00000000012dac30 R08: 0000000000000068 R09: 0101010101010101
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000012da030
R13: 0000000000000040 R14: 00000000012da080 R15: 00000000012dac48
Modules linked in:
---[ end trace 90916a316701b8ae ]---
RIP: 0010:__queue_work+0xe8/0x1280 kernel/workqueue.c:1409
Code: c6 00 bf 97 89 4c 89 e7 e8 15 14 48 02 49 8d 86 80 01 00 00 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 94 0e 00 00 41 8b 9e 80 01 00
RSP: 0018:ffffc900036d7078 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000040 R08: ffff888093d4e600 R09: fffffbfff18fc846
R10: fffffbfff18fc845 R11: ffffffff8c7e422b R12: ffff88809e869918
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000040
FS:  00007f7a68940740(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7a682bef44 CR3: 00000000a89b1000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (6702):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-linux-next-kasan-gce-root	2020/04/02 06:24	linux-next	770fbb32	a34e2c33	.config	log	report	syz	C	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/28 14:49	linux-next	770fbb32	f1ebdfba	.config	log	report	syz	C	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/21 19:33	linux-next	770fbb32	4288d95e	.config	log	report	syz	C	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/20 18:23	linux-next	770fbb32	2c31c529	.config	log	report	syz	C	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/19 05:17	linux-next	770fbb32	0a96a13c	.config	log	report	syz	C	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/15 12:12	linux-next	770fbb32	749688d2	.config	log	report	syz	C	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/09 07:44	linux-next	770fbb32	2e9971bb	.config	log	report	syz	C	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/07 03:54	linux-next	770fbb32	fd2a5f28	.config	log	report	syz	C	axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/26 16:22	linux-next	770fbb32	6d25c5a0	.config	log	report	syz		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/16 07:08	linux-next	770fbb32	749688d2	.config	log	report	syz		axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/04 00:43	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 23:55	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 22:54	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 22:06	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 20:58	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 20:47	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 19:16	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 18:24	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 17:22	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 17:07	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 16:00	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 14:59	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 13:51	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 12:31	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 12:06	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 11:04	linux-next	770fbb32	5ed396e6	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 10:04	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 09:58	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 08:53	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 08:45	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 07:39	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 07:16	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 06:16	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 05:59	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 04:57	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 03:57	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 03:50	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 02:49	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 02:03	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 01:02	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 01:02	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/03 00:00	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 23:04	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 22:38	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 21:37	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 21:22	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 20:15	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 19:20	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 18:21	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 17:26	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/04/02 16:26	linux-next	770fbb32	a34e2c33	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/06 22:31	linux-next	770fbb32	fd2a5f28	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/03/06 21:16	linux-next	770fbb32	c88c7b75	.config	log	report			axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org