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: 4467 Comm: syz.0.220 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:4496
pc : [<819ae208>]    lr : [<802bd9c4>]    psr: 60000013
sp : dfb19e38  ip : dfb19d78  fp : dfb19e5c
r10: 0000001a  r9 : 84898c00  r8 : 84898050
r7 : dde9c560  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 84898c00  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 851019c0  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 84898c00 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 84898000 pointer offset 80 size 3072
Register r9 information: slab task_struct start 84898c00 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfb18000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2787
Register r12 information: 2-page vmalloc region starting at 0xdfb18000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2787
Process syz.0.220 (pid: 4467, stack limit = 0xdfb18000)
Stack: (0xdfb19e38 to 0xdfb1a000)
9e20:                                                       8205dadc 8202f5a0
9e40: 820449b4 00000050 00000074 84898c00 dfb19e8c dfb19e60 804d1bc8 819ae17c
9e60: 00000074 dfb19e70 802147a0 84898050 00000074 00000000 848980c4 dde9c560
9e80: dfb19ec4 dfb19e90 80510994 804d1afc 00000074 00000000 dfb19eb4 84898050
9ea0: 00000074 00000000 00000000 200003c0 84898c00 0000001a dfb19ef4 dfb19ec8
9ec0: 80209d90 80510718 84898000 ddde4340 dfb19ef4 dfb19ee0 819d34cc 200003c0
9ee0: 0000000c 00000000 dfb19f6c dfb19ef8 8020a444 80209d0c 00000000 200003c0
9f00: dfb19f1c dfb19f10 819d3398 8027c5a8 dfb19f6c dfb19f20 8028127c 819d3374
9f20: 802530bc 00000000 84898c00 60000013 dfb19f5c dfb19f40 819caab8 0f246f89
9f40: 84898000 84898000 0000000f 0f246f89 84898000 0000000f 00000000 00000000
9f60: dfb19fa4 dfb19f70 80252e9c 8020a11c 80202cc0 0f246f89 dfb19fac 00000000
9f80: 00000000 002862f4 0000001a 8020029c 84898c00 0000001a 00000000 dfb19fa8
9fa0: 80200060 80252c70 00000000 00000000 0000000f 000000df 00000000 200003c0
9fc0: 00000000 00000000 002862f4 0000001a 00000000 00006364 003d0f00 76b150bc
9fe0: 76b14ec0 76b14eb0 00018af0 00133450 60000010 0000000f 00000000 00000000
Call trace: 
[<819ae170>] (usercopy_abort) from [<804d1bc8>] (__check_heap_object+0xd8/0xf4 mm/slub.c:5651)
[<804d1af0>] (__check_heap_object) from [<80510994>] (check_heap_object mm/usercopy.c:196 [inline])
[<804d1af0>] (__check_heap_object) from [<80510994>] (__check_object_size mm/usercopy.c:251 [inline])
[<804d1af0>] (__check_heap_object) from [<80510994>] (__check_object_size+0x288/0x304 mm/usercopy.c:213)
 r8:dde9c560 r7:848980c4 r6:00000000 r5:00000074 r4:84898050
[<8051070c>] (__check_object_size) from [<80209d90>] (check_object_size include/linux/thread_info.h:228 [inline])
[<8051070c>] (__check_object_size) from [<80209d90>] (__copy_from_user include/linux/uaccess.h:110 [inline])
[<8051070c>] (__check_object_size) from [<80209d90>] (user_regset_copyin include/linux/regset.h:268 [inline])
[<8051070c>] (__check_object_size) from [<80209d90>] (fpa_set+0x90/0x118 arch/arm/kernel/ptrace.c:587)
 r10:0000001a r9:84898c00 r8:200003c0 r7:00000000 r6:00000000 r5:00000074
 r4:84898050
[<80209d00>] (fpa_set) from [<8020a444>] (copy_regset_from_user include/linux/regset.h:337 [inline])
[<80209d00>] (fpa_set) from [<8020a444>] (arch_ptrace+0x334/0x424 arch/arm/kernel/ptrace.c:762)
 r6:00000000 r5:0000000c r4:200003c0
[<8020a110>] (arch_ptrace) from [<80252e9c>] (__do_sys_ptrace kernel/ptrace.c:1285 [inline])
[<8020a110>] (arch_ptrace) from [<80252e9c>] (sys_ptrace+0x238/0x4dc kernel/ptrace.c:1258)
 r7:00000000 r6:00000000 r5:0000000f r4:84898000
[<80252c64>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfb19fa8 to 0xdfb19ff0)
9fa0:                   00000000 00000000 0000000f 000000df 00000000 200003c0
9fc0: 00000000 00000000 002862f4 0000001a 00000000 00006364 003d0f00 76b150bc
9fe0: 76b14ec0 76b14eb0 00018af0 00133450
 r10:0000001a r9:84898c00 r8:8020029c r7:0000001a r6:002862f4 r5:00000000
 r4:00000000
Code: e30d0ae0 e3480205 e58dc000 ebfff273 (e7f001f2) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e30d0ae0 	movw	r0, #56032	@ 0xdae0
   4:	e3480205 	movt	r0, #33285	@ 0x8205
   8:	e58dc000 	str	ip, [sp]
   c:	ebfff273 	bl	0xffffc9e0
* 10:	e7f001f2 	udf	#18 <-- trapping instruction