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Subjectusbip_vudc: BUG kmalloc-2048 (Not tainted): Poison overwritten
Date
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 ........
[ 169.057864] Object 000000002a22de42: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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[ 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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[ 169.104621] Object 0000000003061746: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.104621] Object 00000000fece59fa: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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[ 169.104623] Object 000000001447295a: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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[ 169.104627] Object 00000000e1089c01: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.146281] Object 000000003a17619c: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.146282] Object 000000001fd6e01f: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.146285] Object 00000000cdbc09b5: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.151290] Object 0000000040280d7d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.151291] Object 000000007b278838: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.151292] Object 0000000018198f71: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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[ 169.169637] Object 0000000018c2988d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.169638] Object 000000006b495021: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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[ 169.176311] Object 0000000052a667f6: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.176312] Object 00000000a20cc3af: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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[ 169.176315] Object 00000000cc2bf73f: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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[ 169.176323] Object 00000000b9408868: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
[ 169.176324] Object 000000007d80fb7d: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk
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[ 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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