================================================================== BUG: KASAN: use-after-free in kobject_get+0x113/0x120 lib/kobject.c:663 Read of size 1 at addr ffff8881045a283c by task syz.6.778/2442 CPU: 0 PID: 2442 Comm: syz.6.778 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x100/0x140 mm/kasan/report.c:452 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 kobject_get+0x113/0x120 lib/kobject.c:663 get_device drivers/base/core.c:3361 [inline] device_add+0x331/0xc00 drivers/base/core.c:3191 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1354 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9a749130d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9a7336c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9a74b9afa0 RCX: 00007f9a749130d9 RDX: 00000000000001ff RSI: 00002000000003c0 RDI: ffffffffffffff9c RBP: 00007f9a749aa024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9a74b9b038 R14: 00007f9a74b9afa0 R15: 00007fff2ad6f568 Allocated by task 2041: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x179/0x2e0 mm/slub.c:2979 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [inline] device_create_groups_vargs drivers/base/core.c:3942 [inline] device_create+0x13a/0x300 drivers/base/core.c:4002 android_device_create drivers/usb/gadget/configfs.c:1789 [inline] gadgets_make+0x816/0xa70 drivers/usb/gadget/configfs.c:1886 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1354 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff8881045a2800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 60 bytes inside of 1024-byte region [ffff8881045a2800, ffff8881045a2c00) The buggy address belongs to the page: page:ffffea0004116800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8881045a5800 pfn:0x1045a0 head:ffffea0004116800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 ffffea000497d200 0000000500000005 ffff888100042f00 raw: ffff8881045a5800 0000000080100006 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 279, ts 31743256997, free_ts 31732382070 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc_track_caller+0x1e4/0x310 mm/slub.c:4541 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xdc/0x520 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast+0x1a6/0x5a0 lib/kobject_uevent.c:412 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608 kobject_uevent+0x1d/0x30 lib/kobject_uevent.c:657 rx_queue_add_kobject net/core/net-sysfs.c:1029 [inline] net_rx_queue_update_kobjects+0x1e9/0x410 net/core/net-sysfs.c:1069 register_queue_kobjects net/core/net-sysfs.c:1750 [inline] netdev_register_kobject+0x23d/0x330 net/core/net-sysfs.c:2001 register_netdevice+0xdae/0x13a0 net/core/dev.c:10067 veth_newlink+0x696/0xb60 drivers/net/veth.c:1360 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xd8/0x390 mm/page_alloc.c:5454 __free_slab+0xcf/0x190 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab mm/slub.c:1920 [inline] unfreeze_partials+0x150/0x180 mm/slub.c:2415 put_cpu_partial+0xc1/0x180 mm/slub.c:2451 __slab_free+0x2c9/0x3a0 mm/slub.c:3100 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x10e/0x130 mm/slub.c:3215 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc_trace+0x155/0x2e0 mm/slub.c:2977 kmalloc include/linux/slab.h:555 [inline] syslog_print+0x127/0x720 kernel/printk/printk.c:1487 do_syslog+0x94c/0x9a0 kernel/printk/printk.c:1644 __do_sys_syslog kernel/printk/printk.c:1736 [inline] __se_sys_syslog kernel/printk/printk.c:1734 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1734 Memory state around the buggy address: ffff8881045a2700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881045a2780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8881045a2800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881045a2880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881045a2900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ kobject: '(null)' (ffff8881045a2800): is not initialized, yet kobject_get() is being called. WARNING: CPU: 0 PID: 2442 at lib/kobject.c:666 kobject_get+0x7c/0x120 lib/kobject.c:664 Modules linked in: CPU: 0 PID: 2442 Comm: syz.6.778 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:kobject_get+0x7c/0x120 lib/kobject.c:664 Code: 0a ff 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 96 30 45 ff 48 8b 33 48 c7 c7 00 9d 41 85 48 89 da e8 04 06 1f 02 <0f> 0b eb 0c e8 5b bb 0a ff eb 4c e8 54 bb 0a ff 4c 8d 73 38 4c 89 RSP: 0018:ffffc90000daf970 EFLAGS: 00010246 RAX: b422e125ac06fd00 RBX: ffff8881045a2800 RCX: 0000000000080000 RDX: ffffc9000aa60000 RSI: 0000000000057321 RDI: 0000000000057322 RBP: ffffc90000daf988 R08: ffffc90000daf307 R09: fffff520001b5e94 R10: dffffc0000000000 R11: fffff520001b5e61 R12: 0000000000000000 R13: ffff8881108c9068 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f9a7336c6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe4dc6bd000 CR3: 00000001045fe000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_device drivers/base/core.c:3361 [inline] device_add+0x331/0xc00 drivers/base/core.c:3191 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1354 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9a749130d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9a7336c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9a74b9afa0 RCX: 00007f9a749130d9 RDX: 00000000000001ff RSI: 00002000000003c0 RDI: ffffffffffffff9c RBP: 00007f9a749aa024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9a74b9b038 R14: 00007f9a74b9afa0 R15: 00007fff2ad6f568 ---[ end trace e5fa1af0834c947a ]--- ------------[ cut here ]------------ refcount_t: saturated; leaking memory. WARNING: CPU: 1 PID: 2442 at lib/refcount.c:22 refcount_warn_saturate+0x158/0x1a0 lib/refcount.c:22 Modules linked in: CPU: 1 PID: 2442 Comm: syz.6.778 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:refcount_warn_saturate+0x158/0x1a0 lib/refcount.c:22 Code: 04 01 48 c7 c7 a0 49 40 85 e8 64 d3 3a 02 0f 0b eb 8b e8 bb 88 26 ff c6 05 57 76 82 04 01 48 c7 c7 a0 49 40 85 e8 48 d3 3a 02 <0f> 0b e9 6c ff ff ff e8 9c 88 26 ff c6 05 3c 76 82 04 01 48 c7 c7 RSP: 0018:ffffc90000daf950 EFLAGS: 00010246 RAX: b422e125ac06fd00 RBX: 0000000000000001 RCX: 0000000000080000 RDX: ffffc9000aa60000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90000daf960 R08: ffff8881f7152fbf R09: 1ffff1103ee2a5f7 R10: dffffc0000000000 R11: ffffed103ee2a5f8 R12: 0000000000000000 R13: ffff8881108c9068 R14: 0000000000000001 R15: 00000000aaaaaaaa FS: 00007f9a7336c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe4dc6ba000 CR3: 00000001045fe000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_add include/linux/refcount.h:-1 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] kref_get include/linux/kref.h:45 [inline] kobject_get+0xfb/0x120 lib/kobject.c:667 get_device drivers/base/core.c:3361 [inline] device_add+0x331/0xc00 drivers/base/core.c:3191 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1354 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9a749130d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9a7336c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9a74b9afa0 RCX: 00007f9a749130d9 RDX: 00000000000001ff RSI: 00002000000003c0 RDI: ffffffffffffff9c RBP: 00007f9a749aa024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9a74b9b038 R14: 00007f9a74b9afa0 R15: 00007fff2ad6f568 ---[ end trace e5fa1af0834c947b ]--- ------------[ cut here ]------------ kobject: '|%u ' (ffff8881045a2800): is not initialized, yet kobject_get() is being called. WARNING: CPU: 0 PID: 2442 at lib/kobject.c:666 kobject_get lib/kobject.c:664 [inline] WARNING: CPU: 0 PID: 2442 at lib/kobject.c:666 kobject_add_internal+0x12e/0xde0 lib/kobject.c:248 Modules linked in: CPU: 0 PID: 2442 Comm: syz.6.778 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:kobject_get lib/kobject.c:664 [inline] RIP: 0010:kobject_add_internal+0x12e/0xde0 lib/kobject.c:248 Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 15 18 45 ff 49 8b 34 24 48 c7 c7 00 9d 41 85 4c 89 e2 e8 82 ed 1e 02 <0f> 0b e9 04 01 00 00 e8 d6 a2 0a ff b8 fe ff ff ff e9 b0 09 00 00 RSP: 0018:ffffc90000daf7d8 EFLAGS: 00010246 RAX: b422e125ac06fd00 RBX: ffff8881085fd400 RCX: 0000000000080000 RDX: ffffc9000aa60000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90000daf830 R08: ffff8881f7052fbf R09: 1ffff1103ee0a5f7 R10: dffffc0000000000 R11: ffffed103ee0a5f8 R12: ffff8881045a2800 R13: ffff8881085fd418 R14: 0000000000000000 R15: 1ffff110210bfa80 FS: 00007f9a7336c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8284ea52f8 CR3: 00000001045fe000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kobject_add_varg lib/kobject.c:398 [inline] kobject_add+0x165/0x230 lib/kobject.c:450 class_dir_create_and_add drivers/base/core.c:2825 [inline] get_device_parent+0x3a6/0x410 drivers/base/core.c:2880 device_add+0x349/0xc00 drivers/base/core.c:3192 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1354 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9a749130d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9a7336c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9a74b9afa0 RCX: 00007f9a749130d9 RDX: 00000000000001ff RSI: 00002000000003c0 RDI: ffffffffffffff9c RBP: 00007f9a749aa024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9a74b9b038 R14: 00007f9a74b9afa0 R15: 00007fff2ad6f568 ---[ end trace e5fa1af0834c947c ]--- general protection fault, probably for non-canonical address 0xe15551555555400e: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0x0aaaaaaaaaaa0070-0x0aaaaaaaaaaa0077] CPU: 0 PID: 2442 Comm: syz.6.778 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:kernfs_new_node+0x3f/0x260 fs/kernfs/dir.c:727 Code: 45 89 c5 89 4d d4 41 89 d7 48 89 75 c0 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 8c 79 9d ff 4c 8d 63 72 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 b8 01 00 00 45 0f b7 24 24 44 89 e6 81 RSP: 0018:ffffc90000daf688 EFLAGS: 00010202 RAX: 015555555555400e RBX: 0aaaaaaaaaaa0000 RCX: 0000000000080000 RDX: ffffc9000aa60000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90000daf6c8 R08: 0000000000000000 R09: 0000000000000001 R10: dffffc0000000000 R11: fffff520001b5eec R12: 0aaaaaaaaaaa0072 R13: 0000000000000000 R14: dffffc0000000000 R15: 00000000000041ed FS: 00007f9a7336c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe4dc6ba000 CR3: 00000001045fe000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kernfs_create_dir_ns+0x47/0x130 fs/kernfs/dir.c:1087 sysfs_create_dir_ns+0x128/0x290 fs/sysfs/dir.c:59 create_dir lib/kobject.c:89 [inline] kobject_add_internal+0x774/0xde0 lib/kobject.c:263 kobject_add_varg lib/kobject.c:398 [inline] kobject_add+0x165/0x230 lib/kobject.c:450 class_dir_create_and_add drivers/base/core.c:2825 [inline] get_device_parent+0x3a6/0x410 drivers/base/core.c:2880 device_add+0x349/0xc00 drivers/base/core.c:3192 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1354 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9a749130d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9a7336c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9a74b9afa0 RCX: 00007f9a749130d9 RDX: 00000000000001ff RSI: 00002000000003c0 RDI: ffffffffffffff9c RBP: 00007f9a749aa024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9a74b9b038 R14: 00007f9a74b9afa0 R15: 00007fff2ad6f568 Modules linked in: ---[ end trace e5fa1af0834c947d ]--- RIP: 0010:kernfs_new_node+0x3f/0x260 fs/kernfs/dir.c:727 Code: 45 89 c5 89 4d d4 41 89 d7 48 89 75 c0 48 89 fb 49 be 00 00 00 00 00 fc ff df e8 8c 79 9d ff 4c 8d 63 72 4c 89 e0 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 b8 01 00 00 45 0f b7 24 24 44 89 e6 81 RSP: 0018:ffffc90000daf688 EFLAGS: 00010202 RAX: 015555555555400e RBX: 0aaaaaaaaaaa0000 RCX: 0000000000080000 RDX: ffffc9000aa60000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc90000daf6c8 R08: 0000000000000000 R09: 0000000000000001 R10: dffffc0000000000 R11: fffff520001b5eec R12: 0aaaaaaaaaaa0072 R13: 0000000000000000 R14: dffffc0000000000 R15: 00000000000041ed FS: 00007f9a7336c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe4dc6ba000 CR3: 00000001045fe000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 45 89 c5 mov %r8d,%r13d 3: 89 4d d4 mov %ecx,-0x2c(%rbp) 6: 41 89 d7 mov %edx,%r15d 9: 48 89 75 c0 mov %rsi,-0x40(%rbp) d: 48 89 fb mov %rdi,%rbx 10: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 17: fc ff df 1a: e8 8c 79 9d ff call 0xff9d79ab 1f: 4c 8d 63 72 lea 0x72(%rbx),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 b8 01 00 00 jne 0x1ef 37: 45 0f b7 24 24 movzwl (%r12),%r12d 3c: 44 89 e6 mov %r12d,%esi 3f: 81 .byte 0x81