usercopy: Kernel memory overwrite attempt detected to SLUB object 'task_struct' (offset 80, size 116)!
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kernel BUG at mm/usercopy.c:102!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 UID: 0 PID: 6858 Comm: syz.4.349 Not tainted 6.12.0-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at usercopy_abort+0x98/0x9c mm/usercopy.c:102
LR is at __wake_up_klogd.part.0+0x7c/0xac kernel/printk/printk.c:4525
pc : [<819be580>]    lr : [<802be434>]    psr: 60000013
sp : dfc11e38  ip : dfc11d78  fp : dfc11e5c
r10: 0000001a  r9 : 84c78c00  r8 : 84c7b050
r7 : ddea50e0  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 84c78c00  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 85221500  DAC: 00000000
Register r0 information: non-paged memory
Register r1 information: NULL pointer
Register r2 information: NULL pointer
Register r3 information: slab task_struct start 84c78c00 pointer offset 0 size 3072
Register r4 information: non-paged memory
Register r5 information: non-paged memory
Register r6 information: NULL pointer
Register r7 information: non-slab/vmalloc memory
Register r8 information: slab task_struct start 84c7b000 pointer offset 80 size 3072
Register r9 information: slab task_struct start 84c78c00 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfc10000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2787
Register r12 information: 2-page vmalloc region starting at 0xdfc10000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2787
Process syz.4.349 (pid: 6858, stack limit = 0xdfc10000)
Stack: (0xdfc11e38 to 0xdfc12000)
1e20:                                                       8205f678 82030fcc
1e40: 820464dc 00000050 00000074 84c78c00 dfc11e8c dfc11e60 804d5d54 819be4f4
1e60: 00000074 dfc11e70 80214800 84c7b050 00000074 00000000 84c7b0c4 ddea50e0
1e80: dfc11ec4 dfc11e90 80514b34 804d5c88 00000074 00000000 dfc11eb4 84c7b050
1ea0: 00000074 00000000 00000000 200003c0 84c78c00 0000001a dfc11ef4 dfc11ec8
1ec0: 80209db4 805148b8 84c7b000 ddde4180 dfc11ef4 dfc11ee0 819e37e4 200003c0
1ee0: 0000000c 00000000 dfc11f6c dfc11ef8 8020a468 80209d30 00000000 200003c0
1f00: dfc11f1c dfc11f10 819e36b0 8027c778 dfc11f6c dfc11f20 802813ec 819e368c
1f20: dfc11f54 00000000 8027e354 60000013 81990410 819a7694 dfc11f54 2e608bfa
1f40: 0000000f 84c7b000 0000000f 2e608bfa 84c7b000 0000000f 00000000 00000000
1f60: dfc11fa4 dfc11f70 80252fdc 8020a140 80202cc0 2e608bfa dfc11fac 00000000
1f80: 00000000 002862f4 0000001a 8020029c 84c78c00 0000001a 00000000 dfc11fa8
1fa0: 80200060 80252db0 00000000 00000000 0000000f 000000ae 00000000 200003c0
1fc0: 00000000 00000000 002862f4 0000001a 00000000 00006364 003d0f00 76bff0bc
1fe0: 76bfeec0 76bfeeb0 00018af0 00133450 60000010 0000000f 00000000 00000000
Call trace: 
[<819be4e8>] (usercopy_abort) from [<804d5d54>] (__check_heap_object+0xd8/0xf4 mm/slub.c:5651)
[<804d5c7c>] (__check_heap_object) from [<80514b34>] (check_heap_object mm/usercopy.c:196 [inline])
[<804d5c7c>] (__check_heap_object) from [<80514b34>] (__check_object_size mm/usercopy.c:251 [inline])
[<804d5c7c>] (__check_heap_object) from [<80514b34>] (__check_object_size+0x288/0x304 mm/usercopy.c:213)
 r8:ddea50e0 r7:84c7b0c4 r6:00000000 r5:00000074 r4:84c7b050
[<805148ac>] (__check_object_size) from [<80209db4>] (check_object_size include/linux/thread_info.h:228 [inline])
[<805148ac>] (__check_object_size) from [<80209db4>] (__copy_from_user include/linux/uaccess.h:110 [inline])
[<805148ac>] (__check_object_size) from [<80209db4>] (user_regset_copyin include/linux/regset.h:268 [inline])
[<805148ac>] (__check_object_size) from [<80209db4>] (fpa_set+0x90/0x118 arch/arm/kernel/ptrace.c:587)
 r10:0000001a r9:84c78c00 r8:200003c0 r7:00000000 r6:00000000 r5:00000074
 r4:84c7b050
[<80209d24>] (fpa_set) from [<8020a468>] (copy_regset_from_user include/linux/regset.h:337 [inline])
[<80209d24>] (fpa_set) from [<8020a468>] (arch_ptrace+0x334/0x424 arch/arm/kernel/ptrace.c:762)
 r6:00000000 r5:0000000c r4:200003c0
[<8020a134>] (arch_ptrace) from [<80252fdc>] (__do_sys_ptrace kernel/ptrace.c:1285 [inline])
[<8020a134>] (arch_ptrace) from [<80252fdc>] (sys_ptrace+0x238/0x4dc kernel/ptrace.c:1258)
 r7:00000000 r6:00000000 r5:0000000f r4:84c7b000
[<80252da4>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfc11fa8 to 0xdfc11ff0)
1fa0:                   00000000 00000000 0000000f 000000ae 00000000 200003c0
1fc0: 00000000 00000000 002862f4 0000001a 00000000 00006364 003d0f00 76bff0bc
1fe0: 76bfeec0 76bfeeb0 00018af0 00133450
 r10:0000001a r9:84c78c00 r8:8020029c r7:0000001a r6:002862f4 r5:00000000
 r4:00000000
Code: e30f067c e3480205 e58dc000 ebfff265 (e7f001f2) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e30f067c 	movw	r0, #63100	@ 0xf67c
   4:	e3480205 	movt	r0, #33285	@ 0x8205
   8:	e58dc000 	str	ip, [sp]
   c:	ebfff265 	bl	0xffffc9a8
* 10:	e7f001f2 	udf	#18 <-- trapping instruction