bisecting fixing commit since dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0 building syzkaller on 214351e168def9426c79e1f65a93ddb112cee906 testing commit dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 808f6190460de665c9b72c8da851da189470fa0df29de273a17599a05d4796f4 run #0: basic kernel testing failed: BUG: program execution failed: executor NUM: exit status NUM run #1: crashed: BUG: corrupted list in usb_hcd_link_urb_to_ep run #2: crashed: WARNING in cm109_input_open/usb_submit_urb run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK reproducer seems to be flaky testing current HEAD 5c1ee569660d4a205dced9cb4d0306b907fb7599 testing commit 5c1ee569660d4a205dced9cb4d0306b907fb7599 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 1e7ba68b10ace744401e2356a7b2a72db4a07d8b676892b185916e17e6670245 run #0: OK 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 run #10: OK run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: crashed: BUG: corrupted list in usb_hcd_link_urb_to_ep Reproducer flagged being flaky revisions tested: 2, total time: 24m22.991333399s (build: 12m46.636383165s, test: 11m2.129555762s) the crash still happens on HEAD commit msg: Merge branch 'for-5.17-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup crash: BUG: corrupted list in usb_hcd_link_urb_to_ep cm109 6-1:0.0: invalid payload size 0, expected 4 input: CM109 USB driver as /devices/platform/dummy_hcd.5/usb6/6-1/6-1:0.0/input/input499 list_add double add: new=ffff8880135d3518, prev=ffff8880135d3518, next=ffff888011ba0070. ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:29! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.17.0-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:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 Code: da 39 3d fb 4c 89 e1 48 c7 c7 20 e1 40 89 e8 64 e4 f1 ff 0f 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 60 e2 40 89 e8 4d e4 f1 ff <0f> 0b 48 89 f1 48 c7 c7 e0 e1 40 89 4c 89 e6 e8 39 e4 f1 ff 0f 0b RSP: 0018:ffffc90000cc6e28 EFLAGS: 00010082 RAX: 0000000000000058 RBX: ffff8880135d3500 RCX: 0000000000000000 RDX: 0000000000000003 RSI: 0000000000000004 RDI: fffff52000198db8 RBP: ffff8880135d3518 R08: 0000000000000058 R09: ffff8880b9e27a2b R10: ffffed10173c4f45 R11: 000000000007c078 R12: ffff888011ba0070 R13: 0000000000000000 R14: ffff8880135d3518 R15: ffff888011ba0078 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdf26220130 CR3: 000000007e4b0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] usb_hcd_link_urb_to_ep+0x1c4/0x330 drivers/usb/core/hcd.c:1181 dummy_urb_enqueue+0x221/0x7a0 drivers/usb/gadget/udc/dummy_hcd.c:1284 usb_hcd_submit_urb+0x276/0x1f80 drivers/usb/core/hcd.c:1555 cm109_input_open+0x25b/0x340 drivers/input/misc/cm109.c:572 input_open_device+0x155/0x290 drivers/input/input.c:629 kbd_connect+0xd7/0x120 drivers/tty/vt/keyboard.c:1593 input_attach_handler+0xfb/0x150 drivers/input/input.c:1035 input_register_device.cold+0xb1/0x2a0 drivers/input/input.c:2341 cm109_usb_probe+0x114d/0x1820 drivers/input/misc/cm109.c:806 usb_probe_interface+0x274/0x6a0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:752 driver_probe_device+0x44/0x110 drivers/base/dd.c:782 __device_attach_driver+0x185/0x250 drivers/base/dd.c:899 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:970 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_set_configuration+0xa38/0x1920 drivers/usb/core/message.c:2170 usb_generic_driver_probe+0x74/0xa0 drivers/usb/core/generic.c:238 usb_probe_device+0x95/0x240 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:517 [inline] really_probe+0x1c2/0xb60 drivers/base/dd.c:596 __driver_probe_device+0x2a6/0x460 drivers/base/dd.c:752 driver_probe_device+0x44/0x110 drivers/base/dd.c:782 __device_attach_driver+0x185/0x250 drivers/base/dd.c:899 bus_for_each_drv+0x11e/0x1a0 drivers/base/bus.c:427 __device_attach+0x1db/0x410 drivers/base/dd.c:970 bus_probe_device+0x19d/0x250 drivers/base/bus.c:487 device_add+0x9ca/0x1b10 drivers/base/core.c:3405 usb_new_device.cold+0x585/0xe70 drivers/usb/core/hub.c:2566 hub_port_connect drivers/usb/core/hub.c:5358 [inline] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline] port_event drivers/usb/core/hub.c:5660 [inline] hub_event+0x1ba2/0x3930 drivers/usb/core/hub.c:5742 process_one_work+0x855/0x13e0 kernel/workqueue.c:2307 worker_thread+0x5a0/0xf60 kernel/workqueue.c:2454 kthread+0x299/0x340 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_add_valid.cold+0x26/0x3c lib/list_debug.c:29 Code: da 39 3d fb 4c 89 e1 48 c7 c7 20 e1 40 89 e8 64 e4 f1 ff 0f 0b 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 60 e2 40 89 e8 4d e4 f1 ff <0f> 0b 48 89 f1 48 c7 c7 e0 e1 40 89 4c 89 e6 e8 39 e4 f1 ff 0f 0b RSP: 0018:ffffc90000cc6e28 EFLAGS: 00010082 RAX: 0000000000000058 RBX: ffff8880135d3500 RCX: 0000000000000000 RDX: 0000000000000003 RSI: 0000000000000004 RDI: fffff52000198db8 RBP: ffff8880135d3518 R08: 0000000000000058 R09: ffff8880b9e27a2b R10: ffffed10173c4f45 R11: 000000000007c078 R12: ffff888011ba0070 R13: 0000000000000000 R14: ffff8880135d3518 R15: ffff888011ba0078 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdf26220130 CR3: 000000007e4b0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400