KMSAN: uninit-value in _mix_pool

KMSAN: uninit-value in _mix_pool_bytes
Status: upstream: reported C repro on 2019/11/08 13:14
Reported-by: syzbot+8a8d1324f5b614ad3c8c@syzkaller.appspotmail.com
First crash: 942d, last: 816d

Patch testing requests:
Created	Duration	User	Patch	Repo	Result
2020/09/19 20:57	18m	anant.thazhemadam@gmail.com		https://github.com/google/kmsan.git master	OK

Sample crash report:

usb 1-1: config 0 has no interface number 0
usb 1-1: New USB device found, idVendor=0bda, idProduct=8150, bcdDevice=31.ce
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
==================================================================
BUG: KMSAN: uninit-value in _mix_pool_bytes+0x7de/0x960 drivers/char/random.c:621
CPU: 1 PID: 3089 Comm: kworker/1:2 Not tainted 5.2.0-rc4+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan.c:611
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:304
 _mix_pool_bytes+0x7de/0x960 drivers/char/random.c:621
 add_device_randomness+0x776/0xfa0 drivers/char/random.c:1189
 register_netdevice+0x1eab/0x2690 net/core/dev.c:8724
 register_netdev+0x93/0xd0 net/core/dev.c:8823
 rtl8150_probe+0x11f8/0x1550 drivers/net/usb/rtl8150.c:920
 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
 really_probe+0x1344/0x1d90 drivers/base/dd.c:513
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
 __device_attach+0x489/0x750 drivers/base/dd.c:843
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
 bus_probe_device+0x131/0x390 drivers/base/bus.c:514
 device_add+0x25b5/0x2df0 drivers/base/core.c:2111
 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027
 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210
 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266
 really_probe+0x1344/0x1d90 drivers/base/dd.c:513
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
 __device_attach+0x489/0x750 drivers/base/dd.c:843
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
 bus_probe_device+0x131/0x390 drivers/base/bus.c:514
 device_add+0x25b5/0x2df0 drivers/base/core.c:2111
 usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2534
 hub_port_connect drivers/usb/core/hub.c:5089 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x5853/0x7320 drivers/usb/core/hub.c:5432
 process_one_work+0x1572/0x1f00 kernel/workqueue.c:2269
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:201 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:213 [inline]
 kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:414
 kmsan_memcpy_memmove_metadata+0x9f9/0xe00 mm/kmsan/kmsan.c:297
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:317
 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:139
 set_ethernet_addr drivers/net/usb/rtl8150.c:285 [inline]
 rtl8150_probe+0x114c/0x1550 drivers/net/usb/rtl8150.c:916
 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
 really_probe+0x1344/0x1d90 drivers/base/dd.c:513
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
 __device_attach+0x489/0x750 drivers/base/dd.c:843
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
 bus_probe_device+0x131/0x390 drivers/base/bus.c:514
 device_add+0x25b5/0x2df0 drivers/base/core.c:2111
 usb_set_configuration+0x309f/0x3710 drivers/usb/core/message.c:2027
 generic_probe+0xe7/0x280 drivers/usb/core/generic.c:210
 usb_probe_device+0x146/0x200 drivers/usb/core/driver.c:266
 really_probe+0x1344/0x1d90 drivers/base/dd.c:513
 driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
 __device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
 bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
 __device_attach+0x489/0x750 drivers/base/dd.c:843
 device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
 bus_probe_device+0x131/0x390 drivers/base/bus.c:514
 device_add+0x25b5/0x2df0 drivers/base/core.c:2111
 usb_new_device+0x23e5/0x2fb0 drivers/usb/core/hub.c:2534
 hub_port_connect drivers/usb/core/hub.c:5089 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
 port_event drivers/usb/core/hub.c:5350 [inline]
 hub_event+0x5853/0x7320 drivers/usb/core/hub.c:5432
 process_one_work+0x1572/0x1f00 kernel/workqueue.c:2269
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Local variable description: ----node_id.i@rtl8150_probe
Variable was created at:
 get_registers drivers/net/usb/rtl8150.c:915 [inline]
 set_ethernet_addr drivers/net/usb/rtl8150.c:284 [inline]
 rtl8150_probe+0xdce/0x1550 drivers/net/usb/rtl8150.c:916
 usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
==================================================================

Crashes (42):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kmsan-gce	2019/07/01 10:44	https://github.com/google/kmsan.git master	41550654dedf	699d6448	.config	log	report	syz	C
ci-upstream-kmsan-gce	2019/11/04 05:22	https://github.com/google/kmsan.git master	6f88939b3fa3	b35fad31	.config	log	report
ci-upstream-kmsan-gce	2019/10/29 20:19	https://github.com/google/kmsan.git master	96c6c3194b1b	5ea87a66	.config	log	report
ci-upstream-kmsan-gce	2019/10/28 04:59	https://github.com/google/kmsan.git master	d86c15562d02	25bb509e	.config	log	report
ci-upstream-kmsan-gce	2019/10/25 18:03	https://github.com/google/kmsan.git master	d86c15562d02	c2e837da	.config	log	report
ci-upstream-kmsan-gce	2019/10/24 00:44	https://github.com/google/kmsan.git master	ba606e9df216	b602d64b	.config	log	report
ci-upstream-kmsan-gce	2019/10/23 18:14	https://github.com/google/kmsan.git master	3c8ca70889aa	b602d64b	.config	log	report
ci-upstream-kmsan-gce	2019/10/22 19:05	https://github.com/google/kmsan.git master	3c8ca70889aa	5681358a	.config	log	report
ci-upstream-kmsan-gce	2019/10/22 18:19	https://github.com/google/kmsan.git master	3c8ca70889aa	5681358a	.config	log	report
ci-upstream-kmsan-gce	2019/10/16 22:24	https://github.com/google/kmsan.git master	c24534505750	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/16 20:15	https://github.com/google/kmsan.git master	c24534505750	8c88c9c1	.config	log	report
ci-upstream-kmsan-gce	2019/10/16 17:20	https://github.com/google/kmsan.git master	c24534505750	d4ea592f	.config	log	report
ci-upstream-kmsan-gce	2019/10/16 07:46	https://github.com/google/kmsan.git master	c24534505750	d4ea592f	.config	log	report
ci-upstream-kmsan-gce	2019/10/08 18:01	https://github.com/google/kmsan.git master	cebb918b7474	b1ebbfef	.config	log	report
ci-upstream-kmsan-gce	2019/10/08 17:59	https://github.com/google/kmsan.git master	cebb918b7474	b1ebbfef	.config	log	report
ci-upstream-kmsan-gce	2019/10/06 16:16	https://github.com/google/kmsan.git master	1e76a3e537c3	f3f7d9c8	.config	log	report
ci-upstream-kmsan-gce	2019/10/05 02:23	https://github.com/google/kmsan.git master	1e76a3e537c3	f3f7d9c8	.config	log	report
ci-upstream-kmsan-gce	2019/10/04 13:45	https://github.com/google/kmsan.git master	1e76a3e537c3	b2f369e5	.config	log	report
ci-upstream-kmsan-gce	2019/10/02 16:57	https://github.com/google/kmsan.git master	1e76a3e537c3	2e29b534	.config	log	report
ci-upstream-kmsan-gce	2019/10/01 20:43	https://github.com/google/kmsan.git master	f5f9d3ce4686	b7a87a83	.config	log	report
ci-upstream-kmsan-gce	2019/10/01 20:42	https://github.com/google/kmsan.git master	f5f9d3ce4686	b7a87a83	.config	log	report
ci-upstream-kmsan-gce	2019/10/01 20:38	https://github.com/google/kmsan.git master	f5f9d3ce4686	b7a87a83	.config	log	report
ci-upstream-kmsan-gce	2019/09/29 09:56	https://github.com/google/kmsan.git master	124037e07586	c1ad5441	.config	log	report
ci-upstream-kmsan-gce	2019/09/26 03:05	https://github.com/google/kmsan.git master	cebbfdbcf2b7	a3355dba	.config	log	report
ci-upstream-kmsan-gce	2019/09/24 21:37	https://github.com/google/kmsan.git master	cebbfdbcf2b7	0942eab8	.config	log	report
ci-upstream-kmsan-gce	2019/09/20 00:45	https://github.com/google/kmsan.git master	cebbfdbcf2b7	4d3ae0b7	.config	log	report
ci-upstream-kmsan-gce	2019/09/19 18:32	https://github.com/google/kmsan.git master	cebbfdbcf2b7	eb940044	.config	log	report
ci-upstream-kmsan-gce	2019/09/02 07:22	https://github.com/google/kmsan.git master	e88bfb817dca	db7c31ca	.config	log	report
ci-upstream-kmsan-gce	2019/08/07 19:21	https://github.com/google/kmsan.git master	61ccdad1fcdf	e6ebef88	.config	log	report
ci-upstream-kmsan-gce	2019/08/07 19:18	https://github.com/google/kmsan.git master	61ccdad1fcdf	e6ebef88	.config	log	report
ci-upstream-kmsan-gce	2019/08/02 04:20	https://github.com/google/kmsan.git master	beaab8a31e0d	835dffe7	.config	log	report
ci-upstream-kmsan-gce	2019/07/30 17:01	https://github.com/google/kmsan.git master	beaab8a31e0d	f28bf2a5	.config	log	report
ci-upstream-kmsan-gce	2019/07/29 14:14	https://github.com/google/kmsan.git master	beaab8a31e0d	c85e1c5b	.config	log	report
ci-upstream-kmsan-gce	2019/07/29 14:06	https://github.com/google/kmsan.git master	beaab8a31e0d	c85e1c5b	.config	log	report
ci-upstream-kmsan-gce	2019/07/26 03:57	https://github.com/google/kmsan.git master	beaab8a31e0d	732bc5a0	.config	log	report
ci-upstream-kmsan-gce	2019/07/26 03:48	https://github.com/google/kmsan.git master	beaab8a31e0d	732bc5a0	.config	log	report
ci-upstream-kmsan-gce	2019/07/24 18:18	https://github.com/google/kmsan.git master	beaab8a31e0d	32329ceb	.config	log	report
ci-upstream-kmsan-gce	2019/07/24 11:48	https://github.com/google/kmsan.git master	beaab8a31e0d	32329ceb	.config	log	report
ci-upstream-kmsan-gce	2019/07/18 00:24	https://github.com/google/kmsan.git master	beaab8a31e0d	f613a7c4	.config	log	report
ci-upstream-kmsan-gce	2019/07/11 18:36	https://github.com/google/kmsan.git master	7280182c67ba	186a30b9	.config	log	report
ci-upstream-kmsan-gce	2019/07/01 17:30	https://github.com/google/kmsan.git master	41550654dedf	907bf746	.config	log	report
ci-upstream-kmsan-gce	2019/07/01 05:04	https://github.com/google/kmsan.git master	41550654dedf	699d6448	.config	log	report