Hello, syzbot found the following issue on: HEAD commit: fffe3ae0 Merge tag 'for-linus-hmm' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12b22fda900000 kernel config: https://syzkaller.appspot.com/x/.config?x=226c7a97d80bec54 dashboard link: https://syzkaller.appspot.com/bug?extid=bb9cb5f2cd814f87212a compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bb9cb5f2cd814f87212a@xxxxxxxxxxxxxxxxxxxxxxxxx xpad 3-1:0.65: xpad_irq_in - usb_submit_urb failed with result -19 xpad 3-1:0.65: xpad_irq_out - usb_submit_urb failed with result -19 ================================================================== BUG: KASAN: use-after-free in register_lock_class+0x12a8/0x1520 kernel/locking/lockdep.c:1250 Read of size 2 at addr ffff8880a1f5c092 by task systemd-udevd/1571 CPU: 0 PID: 1571 Comm: systemd-udevd Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 register_lock_class+0x12a8/0x1520 kernel/locking/lockdep.c:1250 __lock_acquire+0xfa/0x2ab0 kernel/locking/lockdep.c:4305 lock_acquire+0x160/0x730 kernel/locking/lockdep.c:5005 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x9e/0xc0 kernel/locking/spinlock.c:159 __wake_up_common_lock kernel/sched/wait.c:122 [inline] __wake_up+0xb8/0x150 kernel/sched/wait.c:142 __usb_hcd_giveback_urb+0x340/0x4b0 drivers/usb/core/hcd.c:1653 dummy_timer+0x71b/0x3e10 drivers/usb/gadget/udc/dummy_hcd.c:1967 call_timer_fn+0x91/0x160 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers+0x65e/0x830 kernel/time/timer.c:1755 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1768 __do_softirq+0x236/0x66c kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 </IRQ> __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x91/0xe0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu+0x1e1/0x1f0 kernel/softirq.c:423 irq_exit_rcu+0x5/0x10 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0xd5/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:do_inode_permission fs/namei.c:396 [inline] RIP: 0010:inode_permission+0x53/0x4a0 fs/namei.c:463 Code: 00 00 00 00 fc ff df 83 e3 02 48 89 1c 24 0f 85 b4 00 00 00 e8 7e 87 b4 ff 4d 8d 7e 02 4c 89 fb 48 c1 eb 03 49 89 ed 8a 04 2b <84> c0 0f 85 23 03 00 00 41 0f b7 2f 83 e5 01 31 ff 89 ee e8 c5 8a RSP: 0018:ffffc90017927c20 EFLAGS: 00000a06 RAX: ffffffff81c05000 RBX: 1ffff110145e86b8 RCX: ffff88801bc50380 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff81c05013 R09: fffff52002f24fb6 R10: fffff52002f24fb6 R11: 0000000000000000 R12: 0000000000000001 R13: dffffc0000000000 R14: ffff8880a2f435c0 R15: ffff8880a2f435c2 may_lookup fs/namei.c:1575 [inline] link_path_walk+0x20e/0xba0 fs/namei.c:2125 path_lookupat+0xab/0x960 fs/namei.c:2332 filename_lookup+0x1ab/0x5d0 fs/namei.c:2366 user_path_at include/linux/namei.h:59 [inline] do_faccessat+0x3a0/0x870 fs/open.c:423 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f25ea32d9c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffc5e5cb2f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000558966534980 RCX: 00007f25ea32d9c7 RDX: 00746e657665752f RSI: 0000000000000000 RDI: 00007ffc5e5cb300 RBP: 00007ffc5e5cb370 R08: 0000000000000122 R09: 0000000000001010 R10: 00007f25ea5ebb58 R11: 0000000000000246 R12: 0000558965bff856 R13: 000055896653ac10 R14: 00007ffc5e5cb300 R15: 000055896653a268 Allocated by task 472: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] xpad_probe+0x389/0x1a10 drivers/input/joystick/xpad.c:1729 usb_probe_interface+0x614/0xac0 drivers/usb/core/driver.c:374 really_probe+0x753/0x1110 drivers/base/dd.c:557 driver_probe_device+0x106/0x1a0 drivers/base/dd.c:738 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x262/0x3f0 drivers/base/dd.c:912 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1630/0x19b0 drivers/base/core.c:2930 usb_set_configuration+0x19d2/0x1f20 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0x82/0x140 drivers/usb/core/generic.c:239 usb_probe_device+0x12d/0x1d0 drivers/usb/core/driver.c:272 really_probe+0x753/0x1110 drivers/base/dd.c:557 driver_probe_device+0x106/0x1a0 drivers/base/dd.c:738 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431 __device_attach+0x262/0x3f0 drivers/base/dd.c:912 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491 device_add+0x1630/0x19b0 drivers/base/core.c:2930 usb_new_device+0xcc3/0x1650 drivers/usb/core/hub.c:2554 hub_port_connect drivers/usb/core/hub.c:5208 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x2823/0x4cb0 drivers/usb/core/hub.c:5576 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Freed by task 22084: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 xpad_disconnect+0x2ec/0x3f0 drivers/input/joystick/xpad.c:1877 usb_unbind_interface+0x1d2/0x840 drivers/usb/core/driver.c:436 __device_release_driver drivers/base/dd.c:1153 [inline] device_release_driver_internal+0x516/0x7b0 drivers/base/dd.c:1184 bus_remove_device+0x2eb/0x360 drivers/base/bus.c:533 device_del+0x7b9/0x1280 drivers/base/core.c:3107 usb_disable_device+0x3ee/0xc80 drivers/usb/core/message.c:1245 usb_disconnect+0x346/0x880 drivers/usb/core/hub.c:2217 hub_port_connect drivers/usb/core/hub.c:5059 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x1c18/0x4cb0 drivers/usb/core/hub.c:5576 process_one_work+0x789/0xfc0 kernel/workqueue.c:2269 worker_thread+0xaa4/0x1460 kernel/workqueue.c:2415 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff8880a1f5c000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 146 bytes inside of 1024-byte region [ffff8880a1f5c000, ffff8880a1f5c400) The buggy address belongs to the page: page:ffffea000287d700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002448208 ffffea000260c7c8 ffff8880aa400c40 raw: 0000000000000000 ffff8880a1f5c000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a1f5bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a1f5c000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a1f5c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a1f5c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a1f5c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. 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