possible deadlock in i2c_transfer

From: syzbot
Date: Fri Nov 29 2019 - 16:05:19 EST

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Hello,

syzbot found the following crash on:

HEAD commit: 32b5e2b2 usb: gadget: add raw-gadget interface
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=117c767ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=d88612251f7691bd
dashboard link: https://syzkaller.appspot.com/bug?extid=136e62496b7564bb81cf
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d808a6e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1652d82ae00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+136e62496b7564bb81cf@xxxxxxxxxxxxxxxxxxxxxxxxx

usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
============================================
WARNING: possible recursive locking detected
5.4.0-syzkaller #0 Not tainted
--------------------------------------------
kworker/1:1/78 is trying to acquire lock:
ffff8881c5c58208 (i2c_register_adapter){+.+.}, at: i2c_lock_bus include/linux/i2c.h:755 [inline]
ffff8881c5c58208 (i2c_register_adapter){+.+.}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline]
ffff8881c5c58208 (i2c_register_adapter){+.+.}, at: i2c_transfer+0x1d3/0x3b0 drivers/i2c/i2c-core-base.c:2041

but task is already holding lock:
ffff8881d51925c0 (i2c_register_adapter){+.+.}, at: i2c_lock_bus include/linux/i2c.h:755 [inline]
ffff8881d51925c0 (i2c_register_adapter){+.+.}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline]
ffff8881d51925c0 (i2c_register_adapter){+.+.}, at: i2c_transfer+0x1d3/0x3b0 drivers/i2c/i2c-core-base.c:2041

other info that might help us debug this:
Possible unsafe locking scenario:

CPU0
----
lock(i2c_register_adapter);
lock(i2c_register_adapter);

*** DEADLOCK ***

May be due to missing lock nesting notation

7 locks held by kworker/1:1/78:
#0: ffff8881d8836528 ((wq_completion)usb_hub_wq){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline]
#0: ffff8881d8836528 ((wq_completion)usb_hub_wq){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff8881d8836528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline]
#0: ffff8881d8836528 ((wq_completion)usb_hub_wq){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline]
#0: ffff8881d8836528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline]
#0: ffff8881d8836528 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline]
#0: ffff8881d8836528 ((wq_completion)usb_hub_wq){+.+.}, at: process_one_work+0x827/0x1530 kernel/workqueue.c:2235
#1: ffff8881d8ec7dd0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x85b/0x1530 kernel/workqueue.c:2239
#2: ffff8881d51c7200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
#2: ffff8881d51c7200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3860 drivers/usb/core/hub.c:5498
#3: ffff8881cf9eb200 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
#3: ffff8881cf9eb200 (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:871
#4: ffff8881cf9ec190 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
#4: ffff8881cf9ec190 (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:871
#5: ffff8881d5123180 (&dev->mutex){....}, at: device_lock include/linux/device.h:1493 [inline]
#5: ffff8881d5123180 (&dev->mutex){....}, at: __device_attach+0x7b/0x360 drivers/base/dd.c:871
#6: ffff8881d51925c0 (i2c_register_adapter){+.+.}, at: i2c_lock_bus include/linux/i2c.h:755 [inline]
#6: ffff8881d51925c0 (i2c_register_adapter){+.+.}, at: __i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline]
#6: ffff8881d51925c0 (i2c_register_adapter){+.+.}, at: i2c_transfer+0x1d3/0x3b0 drivers/i2c/i2c-core-base.c:2041

stack backtrace:
CPU: 1 PID: 78 Comm: kworker/1:1 Not tainted 5.4.0-syzkaller #0
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+0xef/0x16e lib/dump_stack.c:118
print_deadlock_bug kernel/locking/lockdep.c:2371 [inline]
check_deadlock kernel/locking/lockdep.c:2412 [inline]
validate_chain kernel/locking/lockdep.c:2955 [inline]
__lock_acquire.cold+0x114/0x288 kernel/locking/lockdep.c:3955
lock_acquire+0x127/0x320 kernel/locking/lockdep.c:4485
__rt_mutex_lock kernel/locking/rtmutex.c:1471 [inline]
rt_mutex_lock_nested+0x3e/0x60 kernel/locking/rtmutex.c:1484
i2c_lock_bus include/linux/i2c.h:755 [inline]
__i2c_lock_bus_helper drivers/i2c/i2c-core.h:44 [inline]
i2c_transfer+0x1d3/0x3b0 drivers/i2c/i2c-core-base.c:2041
tc90522_master_xfer.part.0+0x65c/0xbf0 drivers/media/dvb-frontends/tc90522.c:708
tc90522_master_xfer+0x35/0x4e drivers/media/dvb-frontends/tc90522.c:643
__i2c_transfer drivers/i2c/i2c-core-base.c:1984 [inline]
__i2c_transfer+0x49d/0x1620 drivers/i2c/i2c-core-base.c:1949
i2c_transfer drivers/i2c/i2c-core-base.c:2045 [inline]
i2c_transfer+0x1e6/0x3b0 drivers/i2c/i2c-core-base.c:2016
dvb_pll_attach+0x228/0x850 drivers/media/dvb-frontends/dvb-pll.c:816
dvb_pll_probe+0xfe/0x174 drivers/media/dvb-frontends/dvb-pll.c:884
i2c_device_probe+0x74e/0xa40 drivers/i2c/i2c-core-base.c:389
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x104/0x210 drivers/base/dd.c:721
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x360 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1480/0x1c20 drivers/base/core.c:2487
i2c_new_client_device+0x57f/0x9b0 drivers/i2c/i2c-core-base.c:777
i2c_new_device+0x19/0x50 drivers/i2c/i2c-core-base.c:820
dvb_module_probe+0xf9/0x220 drivers/media/dvb-core/dvbdev.c:986
friio_tuner_attach+0x12b/0x1d0 drivers/media/usb/dvb-usb-v2/gl861.c:457
dvb_usbv2_adapter_frontend_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:676 [inline]
dvb_usbv2_adapter_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:805 [inline]
dvb_usbv2_init drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:866 [inline]
dvb_usbv2_probe.cold+0x2550/0x25d7 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:981
usb_probe_interface+0x305/0x7a0 drivers/usb/core/driver.c:361
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x104/0x210 drivers/base/dd.c:721
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x360 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1480/0x1c20 drivers/base/core.c:2487
usb_set_configuration+0xe67/0x1740 drivers/usb/core/message.c:2023
generic_probe+0x9d/0xd5 drivers/usb/core/generic.c:210
usb_probe_device+0x99/0x100 drivers/usb/core/driver.c:266
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x104/0x210 drivers/base/dd.c:721
__device_attach_driver+0x1c2/0x220 drivers/base/dd.c:828
bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:430
__device_attach+0x217/0x360 drivers/base/dd.c:894
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:490
device_add+0x1480/0x1c20 drivers/base/core.c:2487
usb_new_device.cold+0x6a4/0xe79 drivers/usb/core/hub.c:2537
hub_port_connect drivers/usb/core/hub.c:5184 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
port_event drivers/usb/core/hub.c:5470 [inline]
hub_event+0x1e59/0x3860 drivers/usb/core/hub.c:5552
process_one_work+0x92b/0x1530 kernel/workqueue.c:2264
worker_thread+0x96/0xe20 kernel/workqueue.c:2410
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 2
usb 1-1: new high-speed USB device number 3 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 3
usb 1-1: new high-speed USB device number 4 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 4
usb 1-1: new high-speed USB device number 5 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 5
usb 1-1: new high-speed USB device number 6 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 6
usb 1-1: new high-speed USB device number 7 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 7
usb 1-1: new high-speed USB device number 8 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 8
usb 1-1: new high-speed USB device number 9 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 9
usb 1-1: new high-speed USB device number 10 using dummy_hcd
usb 1-1: Using ep0 maxpacket: 8
usb 1-1: New USB device found, idVendor=7a69, idProduct=0001, bcdDevice=19.36
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
usb 1-1: dvb_usb_v2: found a '774 Friio White ISDB-T USB2.0' in warm state
usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer
dvbdev: DVB: registering new adapter (774 Friio White ISDB-T USB2.0)
usb 1-1: media controller created
dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered.
tc90522 0-0018: Toshiba TC90522 attached.
usb 1-1: DVB: registering adapter 0 frontend 0 (Toshiba TC90522 ISDB-T module)...
dvbdev: dvb_create_media_entity: media entity 'Toshiba TC90522 ISDB-T module' registered.
dvb_pll: probe of 1-0060 failed with error -12
usb 1-1: USB disconnect, device number 10

---
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