usbip_vudc: BUG kmalloc-2048 (Not tainted): Poison overwritten

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Kernel 4.19-rc7, on x86_64:

Load usbip_vudc module, then unload (rmmod) it.
Load it again:


[  169.042156] calling  init+0x0/0x1000 [usbip_vudc] @ 1697
[  169.042396] =============================================================================
[  169.043678] probe of usbip-vudc.0 returned 1 after 350 usecs
[  169.044508] BUG kmalloc-2048 (Not tainted): Poison overwritten
[  169.044509] -----------------------------------------------------------------------------
[  169.044509] 
[  169.044510] Disabling lock debugging due to kernel taint
[  169.044512] INFO: 0x0000000012a0ffa1-0x0000000012a0ffa1. First byte 0x6a instead of 0x6b
[  169.044517] INFO: Allocated in platform_device_alloc+0x20/0x70 age=10318 cpu=0 pid=1686
[  169.044521] 	__kmalloc+0x16e/0x1e0
[  169.044524] 	platform_device_alloc+0x20/0x70
[  169.045588] initcall init+0x0/0x1000 [usbip_vudc] returned 0 after 2439 usecs
[  169.046607] 	0xffffffffc0c2e987
[  169.046610] 	init+0x75/0x1000 [usbip_vudc]
[  169.046613] 	do_one_initcall+0x47/0x19a
[  169.046616] 	do_init_module+0x51/0x1da
[  169.046621] 	load_module+0x1707/0x1d40
[  169.057841] 	__do_sys_finit_module+0xbd/0xe0
[  169.057843] 	do_syscall_64+0x60/0x180
[  169.057846] 	entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  169.057849] INFO: Freed in device_release+0x2b/0x80 age=4223 cpu=3 pid=1693
[  169.057852] 	kobject_put+0x86/0x1b0
[  169.057853] 	0xffffffffc0c30a96
[  169.057855] 	__x64_sys_delete_module+0x157/0x240
[  169.057856] 	do_syscall_64+0x60/0x180
[  169.057858] 	entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  169.057859] INFO: Slab 0x000000004c31e13a objects=13 used=13 fp=0x          (null) flags=0x17ffffc0008100
[  169.057861] INFO: Object 0x000000002a22de42 @offset=4776 fp=0x          (null)
[  169.057861] 
[  169.057863] Redzone 0000000002f46029: bb bb bb bb bb bb bb bb                          ........
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[  169.104613] Object 000000005abc0694: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
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[  169.104616] Object 00000000a1ed433a: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
[  169.104617] Object 00000000a6b0353d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
[  169.104618] Object 000000004dbcc646: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
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[  169.176322] Object 0000000026874b83: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
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[  169.251361] Object 00000000793ab8ee: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
[  169.251362] Object 000000006232fdcf: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
[  169.251364] Object 0000000057b14dfc: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
[  169.278021] Object 0000000037afcc32: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
[  169.278022] Object 0000000092cffac1: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
[  169.278024] Object 00000000328b4b28: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5  kkkkkkkkkkkkkkk.
[  169.283029] Redzone 000000001a0e0da2: bb bb bb bb bb bb bb bb                          ........
[  169.283030] Padding 00000000a8cbcf3e: 5a 5a 5a 5a 5a 5a 5a 5a                          ZZZZZZZZ
[  169.283033] CPU: 0 PID: 170 Comm: systemd-udevd Tainted: G    B             4.19.0-rc7mod #2
[  169.283034] Hardware name: TOSHIBA PORTEGE R835/Portable PC, BIOS Version 4.10   01/08/2013
[  169.283035] Call Trace:
[  169.289493]  dump_stack+0x5c/0x7b
[  169.289495]  check_bytes_and_report+0xbd/0x100
[  169.290828]  check_object+0x218/0x260
[  169.290832]  ? sk_prot_alloc+0x77/0x120
[  169.290834]  alloc_debug_processing+0xf9/0x1a0
[  169.290836]  ___slab_alloc+0x576/0x600
[  169.290839]  ? sk_prot_alloc+0x77/0x120
[  169.290842]  ? __lock_acquire.isra.32+0x169/0x850
[  169.290845]  ? sk_prot_alloc+0x77/0x120
[  169.290847]  ? __slab_alloc.isra.88+0x22/0x40
[  169.290850]  __slab_alloc.isra.88+0x22/0x40
[  169.297190]  __kmalloc+0x16e/0x1e0
[  169.297194]  sk_prot_alloc+0x77/0x120
[  169.298398]  sk_alloc+0x31/0x390
[  169.298402]  __netlink_create+0x2d/0xe0
[  169.298405]  netlink_create+0x10e/0x230
[  169.300272]  __sock_create+0x185/0x260
[  169.300276]  __sys_socket+0x40/0xb0
[  169.301481]  __x64_sys_socket+0x11/0x20
[  169.301483]  do_syscall_64+0x60/0x180
[  169.301485]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  169.301487] RIP: 0033:0x7f6fb97c3c17
[  169.301489] Code: 73 01 c3 48 8b 0d 81 a2 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 a2 2b 00 f7 d8 64 89 01 48
[  169.301490] RSP: 002b:00007fff8baa7e88 EFLAGS: 00000286 ORIG_RAX: 0000000000000029
[  169.301492] RAX: ffffffffffffffda RBX: 000055c6530c3ed0 RCX: 00007f6fb97c3c17
[  169.301494] RDX: 000000000000000f RSI: 0000000000080803 RDI: 0000000000000010
[  169.301495] RBP: 000055c6530b7d40 R08: 000055c6530c3ed0 R09: 0000000000000021
[  169.301496] R10: 000055c6530b29e0 R11: 0000000000000286 R12: 00000000ffffffff
[  169.301497] R13: 0000000000000000 R14: 000055c6530f83b0 R15: 000055c6530b7c70
[  169.301502] FIX kmalloc-2048: Restoring 0x0000000012a0ffa1-0x0000000012a0ffa1=0x6b
[  169.301502] 
[  169.301503] FIX kmalloc-2048: Marking all objects used


-- 
~Randy



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