bisecting cause commit starting from c28e58ee9dadc99f79cf16ca805221feddd432ad building syzkaller on 917afeaa705dfdebeebcd674db3bcba279241d5e testing commit c28e58ee9dadc99f79cf16ca805221feddd432ad with gcc (GCC) 8.1.0 kernel signature: 6dc78f338947d04ae02e8010aa86d3d305ee13219e99bb2cde3b540889682664 all runs: crashed: INFO: task hung in synchronize_rcu testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: cfc0ef515e1016e763ffbed90f7e1028b06a3094c80eca02c6affad5ac8f53f9 all runs: crashed: INFO: task hung in synchronize_rcu testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: ae42c90576d4f4ec3954279cbb09539663f69cfcf534bc4151f7214201af7e51 all runs: OK # git bisect start 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 7111951b8d4973bda27ff663f2cf18b663d15b48 Bisecting: 7542 revisions left to test after this (roughly 13 steps) [50a5de895dbe5df947b3a695777db5b2c313e065] Merge tag 'for-linus-hmm' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma testing commit 50a5de895dbe5df947b3a695777db5b2c313e065 with gcc (GCC) 8.1.0 kernel signature: f94b676757f6756a3162e00017b58e49c9081c0d8ddfdadfd8c1caa85e475f0e all runs: crashed: INFO: task hung in synchronize_rcu # git bisect bad 50a5de895dbe5df947b3a695777db5b2c313e065 Bisecting: 4204 revisions left to test after this (roughly 12 steps) [56a451b780676bc1cdac011735fe2869fa2e9abf] Merge tag 'ntb-5.7' of git://github.com/jonmason/ntb testing commit 56a451b780676bc1cdac011735fe2869fa2e9abf with gcc (GCC) 8.1.0 kernel signature: 85d4abe62908cd5ecde757d6618cee7701fd743c3ae82fe4cb45acad3c996a2f all runs: crashed: INFO: task hung in synchronize_rcu # git bisect bad 56a451b780676bc1cdac011735fe2869fa2e9abf Bisecting: 1643 revisions left to test after this (roughly 11 steps) [49835c15a55225e9b3ff9cc9317135b334ea2d49] Merge tag 'pm-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm testing commit 49835c15a55225e9b3ff9cc9317135b334ea2d49 with gcc (GCC) 8.1.0 kernel signature: 7c1518f770887e7cf8f573e8e1eab1c46cf40b0631c321c7a8fae5d9c242061d all runs: crashed: INFO: task hung in synchronize_rcu # git bisect bad 49835c15a55225e9b3ff9cc9317135b334ea2d49 Bisecting: 934 revisions left to test after this (roughly 10 steps) [063d1942247668eb0bb800aef5afbbef337344be] Merge tag 'media/v5.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media testing commit 063d1942247668eb0bb800aef5afbbef337344be with gcc (GCC) 8.1.0 kernel signature: 739c44dd301aaabc589ce0e42de279b2e2769571824765611216055975a9b34c all runs: OK # git bisect good 063d1942247668eb0bb800aef5afbbef337344be Bisecting: 516 revisions left to test after this (roughly 9 steps) [e681bb287f40e7a9dbcb04cef80fd87a2511ab86] staging: vt6656: Use DIV_ROUND_UP macro instead of specific code testing commit e681bb287f40e7a9dbcb04cef80fd87a2511ab86 with gcc (GCC) 8.1.0 kernel signature: 421e2d9fe9c86c2328c86e856938c6a62b344cefe500f46fa06707eba48f189c all runs: OK # git bisect good e681bb287f40e7a9dbcb04cef80fd87a2511ab86 Bisecting: 266 revisions left to test after this (roughly 8 steps) [db34c5ffee649e2c4c870d1031a996398a187cf5] Merge tag 'usb-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb testing commit db34c5ffee649e2c4c870d1031a996398a187cf5 with gcc (GCC) 8.1.0 kernel signature: 08626590f893f896aa7b5b22f1b5ea67c457734c8b2727952c999c856fa8c828 all runs: crashed: INFO: task hung in synchronize_rcu # git bisect bad db34c5ffee649e2c4c870d1031a996398a187cf5 Bisecting: 121 revisions left to test after this (roughly 7 steps) [a8ab3e76297ea85d92f4ee0833bd469816a13ccf] Merge tag 'usb-for-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb into usb-next testing commit a8ab3e76297ea85d92f4ee0833bd469816a13ccf with gcc (GCC) 8.1.0 kernel signature: a170aa36eca2a4f796b70176a70ce5a20f9fef1a8a0d41c4d03e32f170a114be run #0: crashed: INFO: task hung in synchronize_rcu run #1: crashed: INFO: task hung in synchronize_rcu run #2: crashed: INFO: task hung in synchronize_rcu run #3: crashed: INFO: task hung in synchronize_rcu run #4: crashed: INFO: task hung in synchronize_rcu run #5: crashed: INFO: task hung in synchronize_rcu run #6: crashed: INFO: task hung in synchronize_rcu run #7: crashed: INFO: task hung in synchronize_rcu run #8: boot failed: can't ssh into the instance run #9: boot failed: can't ssh into the instance # git bisect bad a8ab3e76297ea85d92f4ee0833bd469816a13ccf Bisecting: 63 revisions left to test after this (roughly 6 steps) [d1c6a769cdf466053ae211789f2b0671c8a72331] usb: typec: mux: Allow the mux handles to be requested with fwnode testing commit d1c6a769cdf466053ae211789f2b0671c8a72331 with gcc (GCC) 8.1.0 kernel signature: 9ce2aa746c666c9181bae0a25ba3d818e6c04a7af95fc2f7c22fedfd14314ca4 run #0: boot failed: can't ssh into the instance run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect good d1c6a769cdf466053ae211789f2b0671c8a72331 Bisecting: 31 revisions left to test after this (roughly 5 steps) [eeead847487f726fa177d0f4060c4f0816ad9cd9] usb: gadget: amd5536udc: fix spelling mistake "reserverd" -> "reserved" testing commit eeead847487f726fa177d0f4060c4f0816ad9cd9 with gcc (GCC) 8.1.0 kernel signature: 0d90275c2e737bf459b254c7aad62d51ed8d86d01b14c79e28c898b0070f75e5 all runs: crashed: INFO: task hung in synchronize_rcu # git bisect bad eeead847487f726fa177d0f4060c4f0816ad9cd9 Bisecting: 15 revisions left to test after this (roughly 4 steps) [3d157c28d2289edf0439e8308e8de3a06acaaf0e] doc: dt: bindings: usb: dwc3: Update entries for disabling SS instances in park mode testing commit 3d157c28d2289edf0439e8308e8de3a06acaaf0e with gcc (GCC) 8.1.0 kernel signature: 781b6aa12cf80d3ee7dfb9f6fb7822f8a45d0528be368803976363271fa46646 all runs: OK # git bisect good 3d157c28d2289edf0439e8308e8de3a06acaaf0e Bisecting: 7 revisions left to test after this (roughly 3 steps) [0227cc84c44417a29c8102e41db8ec2c11ebc6b2] usb: dwc3: core: don't do suspend for device mode if already suspended testing commit 0227cc84c44417a29c8102e41db8ec2c11ebc6b2 with gcc (GCC) 8.1.0 kernel signature: 64cce858efa7b819b455981edeae5dd849915f9fe4f5b42196f8ab2e6ffd07d5 all runs: OK # git bisect good 0227cc84c44417a29c8102e41db8ec2c11ebc6b2 Bisecting: 3 revisions left to test after this (roughly 2 steps) [95b18f28979e12539cc02f6ec4e2c776e8551f39] dt-bindings: usb: dwc2: add compatible property for rk3328 usb testing commit 95b18f28979e12539cc02f6ec4e2c776e8551f39 with gcc (GCC) 8.1.0 kernel signature: 3dcea9fe41566965ce4b00e93c1f2511d628c258a55d0939e0d0541fd196f8a5 all runs: crashed: INFO: task hung in synchronize_rcu # git bisect bad 95b18f28979e12539cc02f6ec4e2c776e8551f39 Bisecting: 1 revision left to test after this (roughly 1 step) [1a0808cb9e417170ed6ab97254cf319dc3e3c310] usb: dwc2: Implement set_selfpowered() testing commit 1a0808cb9e417170ed6ab97254cf319dc3e3c310 with gcc (GCC) 8.1.0 kernel signature: 3ea7e845dd25846befac624f02ef2750e6fc37bb4f59c1da4fe616c152b22c78 all runs: OK # git bisect good 1a0808cb9e417170ed6ab97254cf319dc3e3c310 Bisecting: 0 revisions left to test after this (roughly 0 steps) [f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10] usb: gadget: add raw-gadget interface testing commit f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10 with gcc (GCC) 8.1.0 kernel signature: 8efb67c8cd700d0b46faf2e576675fb5213b577283a3e6bee15bc0615ab80908 all runs: crashed: INFO: task hung in synchronize_rcu # git bisect bad f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10 f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10 is the first bad commit commit f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10 Author: Andrey Konovalov Date: Mon Feb 24 17:13:03 2020 +0100 usb: gadget: add raw-gadget interface USB Raw Gadget is a kernel module that provides a userspace interface for the USB Gadget subsystem. Essentially it allows to emulate USB devices from userspace. Enabled with CONFIG_USB_RAW_GADGET. Raw Gadget is currently a strictly debugging feature and shouldn't be used in production. Raw Gadget is similar to GadgetFS, but provides a more low-level and direct access to the USB Gadget layer for the userspace. The key differences are: 1. Every USB request is passed to the userspace to get a response, while GadgetFS responds to some USB requests internally based on the provided descriptors. However note, that the UDC driver might respond to some requests on its own and never forward them to the Gadget layer. 2. GadgetFS performs some sanity checks on the provided USB descriptors, while Raw Gadget allows you to provide arbitrary data as responses to USB requests. 3. Raw Gadget provides a way to select a UDC device/driver to bind to, while GadgetFS currently binds to the first available UDC. 4. Raw Gadget uses predictable endpoint names (handles) across different UDCs (as long as UDCs have enough endpoints of each required transfer type). 5. Raw Gadget has ioctl-based interface instead of a filesystem-based one. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Andrey Konovalov Signed-off-by: Felipe Balbi Documentation/usb/index.rst | 1 + Documentation/usb/raw-gadget.rst | 61 ++ drivers/usb/gadget/legacy/Kconfig | 11 + drivers/usb/gadget/legacy/Makefile | 1 + drivers/usb/gadget/legacy/raw_gadget.c | 1078 ++++++++++++++++++++++++++++++++ include/uapi/linux/usb/raw_gadget.h | 167 +++++ 6 files changed, 1319 insertions(+) create mode 100644 Documentation/usb/raw-gadget.rst create mode 100644 drivers/usb/gadget/legacy/raw_gadget.c create mode 100644 include/uapi/linux/usb/raw_gadget.h culprit signature: 8efb67c8cd700d0b46faf2e576675fb5213b577283a3e6bee15bc0615ab80908 parent signature: 3ea7e845dd25846befac624f02ef2750e6fc37bb4f59c1da4fe616c152b22c78 revisions tested: 17, total time: 4h15m9.708785109s (build: 1h47m54.310686948s, test: 2h24m48.14576166s) first bad commit: f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10 usb: gadget: add raw-gadget interface cc: ["andreyknvl@google.com" "balbi@kernel.org" "gregkh@linuxfoundation.org"] crash: INFO: task hung in synchronize_rcu INFO: task kworker/u4:4:189 blocked for more than 143 seconds. Not tainted 5.6.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:4 D28088 189 2 0x80004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: schedule+0xc4/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x56c/0x970 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x25f/0x3c0 kernel/sched/completion.c:136 __synchronize_srcu+0x18e/0x240 kernel/rcu/srcutree.c:922 fsnotify_connector_destroy_workfn+0x40/0xa0 fs/notify/mark.c:164 process_one_work+0x903/0x15c0 kernel/workqueue.c:2264 worker_thread+0x82/0xb50 kernel/workqueue.c:2410 kthread+0x31d/0x3e0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task kworker/u4:6:435 blocked for more than 143 seconds. Not tainted 5.6.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:6 D28232 435 2 0x80004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: schedule+0xc4/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x56c/0x970 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x25f/0x3c0 kernel/sched/completion.c:136 __synchronize_srcu+0x18e/0x240 kernel/rcu/srcutree.c:922 fsnotify_mark_destroy_workfn+0xea/0x330 fs/notify/mark.c:832 process_one_work+0x903/0x15c0 kernel/workqueue.c:2264 worker_thread+0x82/0xb50 kernel/workqueue.c:2410 kthread+0x31d/0x3e0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Showing all locks held in the system: 2 locks held by kworker/u4:4/189: #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: process_one_work+0x80f/0x15c0 kernel/workqueue.c:2235 #1: ffffc90000fc7e00 (connector_reaper_work){+.+.}, at: process_one_work+0x844/0x15c0 kernel/workqueue.c:2239 2 locks held by kworker/u4:5/239: #0: ffff8880ae837558 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #0: ffff8880ae837558 (&rq->lock){-.-.}, at: __schedule+0x23c/0x1970 kernel/sched/core.c:4028 #1: ffffc90001aa7e00 ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}, at: process_one_work+0x844/0x15c0 kernel/workqueue.c:2239 2 locks held by kworker/u4:6/435: #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa433928 ((wq_completion)events_unbound){+.+.}, at: process_one_work+0x80f/0x15c0 kernel/workqueue.c:2235 #1: ffffc90002647e00 ((reaper_work).work){+.+.}, at: process_one_work+0x844/0x15c0 kernel/workqueue.c:2239 1 lock held by khungtaskd/1120: #0: ffffffff88ba63c0 (rcu_read_lock){....}, at: debug_show_all_locks+0x52/0x28d kernel/locking/lockdep.c:5331 6 locks held by kworker/1:25/2753: 6 locks held by kworker/0:58/2940: 1 lock held by in:imklog/6735: #0: ffff8880a31730e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x96/0xb0 fs/file.c:821 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1120 Comm: khungtaskd Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x128/0x182 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.7+0x4b/0x83 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x183/0x1ac lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x629/0xc70 kernel/hung_task.c:289 kthread+0x31d/0x3e0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2940 Comm: kworker/0:58 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:hid_apply_multiplier drivers/hid/hid-core.c:1106 [inline] RIP: 0010:hid_setup_resolution_multiplier+0x339/0xc80 drivers/hid/hid-core.c:1163 Code: 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 e9 05 00 00 41 83 7f 04 02 74 31 48 c1 e5 04 4d 8d 3c 2c 4c 89 f8 48 c1 e8 03 <42> 0f b6 14 08 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 RSP: 0018:ffffc90009046c70 EFLAGS: 00000a02 RAX: 1ffff110115f0180 RBX: ffff888079f00000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88808af80c04 RBP: 0000000000000000 R08: ffff888089a40000 R09: dffffc0000000000 R10: 0000000000001323 R11: ffffc900041410db R12: ffff88808af80c00 R13: ffff888089a40000 R14: ffffc90004126000 R15: ffff88808af80c00 FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fce84c8e010 CR3: 00000000964dc000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: hid_open_report+0x3b3/0x5d0 drivers/hid/hid-core.c:1274 hid_parse include/linux/hid.h:1017 [inline] ms_probe+0xeb/0x460 drivers/hid/hid-microsoft.c:388 hid_device_probe+0x260/0x350 drivers/hid/hid-core.c:2263 really_probe+0x1f9/0x5e0 drivers/base/dd.c:551 driver_probe_device+0xc9/0x1b0 drivers/base/dd.c:724 bus_for_each_drv+0x117/0x1a0 drivers/base/bus.c:431 __device_attach+0x1be/0x2c0 drivers/base/dd.c:897 bus_probe_device+0x19e/0x250 drivers/base/bus.c:491 device_add+0x10d0/0x1900 drivers/base/core.c:2500 hid_add_device+0x2da/0x8b0 drivers/hid/hid-core.c:2419 usbhid_probe+0x9b5/0xe40 drivers/hid/usbhid/hid-core.c:1386 usb_probe_interface+0x268/0x6c0 drivers/usb/core/driver.c:361 really_probe+0x1f9/0x5e0 drivers/base/dd.c:551 driver_probe_device+0xc9/0x1b0 drivers/base/dd.c:724 bus_for_each_drv+0x117/0x1a0 drivers/base/bus.c:431 __device_attach+0x1be/0x2c0 drivers/base/dd.c:897 bus_probe_device+0x19e/0x250 drivers/base/bus.c:491 device_add+0x10d0/0x1900 drivers/base/core.c:2500 usb_set_configuration+0xc02/0x1560 drivers/usb/core/message.c:2023 generic_probe+0x61/0x8a drivers/usb/core/generic.c:210 really_probe+0x1f9/0x5e0 drivers/base/dd.c:551 driver_probe_device+0xc9/0x1b0 drivers/base/dd.c:724 bus_for_each_drv+0x117/0x1a0 drivers/base/bus.c:431 __device_attach+0x1be/0x2c0 drivers/base/dd.c:897 bus_probe_device+0x19e/0x250 drivers/base/bus.c:491 device_add+0x10d0/0x1900 drivers/base/core.c:2500 usb_new_device.cold.66+0x679/0xe85 drivers/usb/core/hub.c:2548 hub_port_connect drivers/usb/core/hub.c:5195 [inline] hub_port_connect_change drivers/usb/core/hub.c:5335 [inline] port_event drivers/usb/core/hub.c:5481 [inline] hub_event+0x15fe/0x2d60 drivers/usb/core/hub.c:5563 process_one_work+0x903/0x15c0 kernel/workqueue.c:2264 worker_thread+0x82/0xb50 kernel/workqueue.c:2410 kthread+0x31d/0x3e0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352