usercopy: Kernel memory overwrite attempt detected to SLUB object 'task_struct' (offset 80, size 116)!
------------[ cut here ]------------
kernel BUG at mm/usercopy.c:102!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 3939 Comm: syz-executor.0 Not tainted 6.9.0-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:3926
pc : [<818d1418>]    lr : [<802bb78c>]    psr: 60000013
sp : dfc31e40  ip : dfc31d88  fp : dfc31e64
r10: 0000001a  r9 : 8378b000  r8 : 8378d450
r7 : dde75f20  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 8378b000  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 846d18c0  DAC: fffffffd
Register r0 information: non-paged memory
Register r1 information: NULL pointer
Register r2 information: NULL pointer
Register r3 information: slab task_struct start 8378b000 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 8378d400 pointer offset 80 size 3072
Register r9 information: slab task_struct start 8378b000 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfc30000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2797
Register r12 information: 2-page vmalloc region starting at 0xdfc30000 allocated at kernel_clone+0xac/0x3c8 kernel/fork.c:2797
Process syz-executor.0 (pid: 3939, stack limit = 0xdfc30000)
Stack: (0xdfc31e40 to 0xdfc32000)
1e40: 820000c4 81fd28a4 81fe70d0 00000050 00000074 8378b000 dfc31e94 dfc31e68
1e60: 804bce1c 818d138c 00000074 dfc31e78 80215d90 8378d450 00000074 00000000
1e80: 8378d4c4 dde75f20 dfc31ecc dfc31e98 804f3ee0 804bcd50 00000074 00000000
1ea0: dfc31ebc 8378d450 00000074 00000000 00000000 00000000 8378b000 0000001a
1ec0: dfc31ef4 dfc31ed0 80209c80 804f3d00 dfc31ef4 dfc31ee0 818f5bd8 8027daec
1ee0: 00000000 0000000c dfc31f6c dfc31ef8 8020a2bc 80209bfc 00000000 00000000
1f00: dfc31f1c dfc31f10 818f5aa4 8027c158 dfc31f6c dfc31f20 80281f9c 818f5a80
1f20: 80253a34 00000000 8378b000 60000013 dfc31f5c dfc31f40 818ed60c 4760af04
1f40: 0000000f 0000000f 8378d400 4760af04 0000000f 8378d400 00000000 00000000
1f60: dfc31fa4 dfc31f70 80253810 80209fd4 80202bfc 4760af04 dfc31fac 00000000
1f80: 00000000 0014c2c4 0000001a 80200288 8378b000 0000001a 00000000 dfc31fa8
1fa0: 80200060 802535e4 00000000 00000000 0000000f 00000004 00000000 00000000
1fc0: 00000000 00000000 0014c2c4 0000001a 7ee4832e 7ee4832f 003d0f00 76bde0fc
1fe0: 76bddf08 76bddef8 00016680 000509d0 60000010 0000000f 00000000 00000000
Call trace: 
[<818d1380>] (usercopy_abort) from [<804bce1c>] (__check_heap_object+0xd8/0xf4 mm/slub.c:5440)
[<804bcd44>] (__check_heap_object) from [<804f3ee0>] (check_heap_object mm/usercopy.c:196 [inline])
[<804bcd44>] (__check_heap_object) from [<804f3ee0>] (__check_object_size mm/usercopy.c:251 [inline])
[<804bcd44>] (__check_heap_object) from [<804f3ee0>] (__check_object_size+0x1ec/0x30c mm/usercopy.c:213)
 r8:dde75f20 r7:8378d4c4 r6:00000000 r5:00000074 r4:8378d450
[<804f3cf4>] (__check_object_size) from [<80209c80>] (check_object_size include/linux/thread_info.h:215 [inline])
[<804f3cf4>] (__check_object_size) from [<80209c80>] (__copy_from_user include/linux/uaccess.h:101 [inline])
[<804f3cf4>] (__check_object_size) from [<80209c80>] (user_regset_copyin include/linux/regset.h:268 [inline])
[<804f3cf4>] (__check_object_size) from [<80209c80>] (fpa_set+0x90/0xfc arch/arm/kernel/ptrace.c:587)
 r10:0000001a r9:8378b000 r8:00000000 r7:00000000 r6:00000000 r5:00000074
 r4:8378d450
[<80209bf0>] (fpa_set) from [<8020a2bc>] (copy_regset_from_user include/linux/regset.h:337 [inline])
[<80209bf0>] (fpa_set) from [<8020a2bc>] (arch_ptrace+0x2f4/0x3e4 arch/arm/kernel/ptrace.c:762)
 r5:0000000c r4:00000000
[<80209fc8>] (arch_ptrace) from [<80253810>] (__do_sys_ptrace kernel/ptrace.c:1285 [inline])
[<80209fc8>] (arch_ptrace) from [<80253810>] (sys_ptrace+0x238/0x4e0 kernel/ptrace.c:1258)
 r7:00000000 r6:00000000 r5:8378d400 r4:0000000f
[<802535d8>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xdfc31fa8 to 0xdfc31ff0)
1fa0:                   00000000 00000000 0000000f 00000004 00000000 00000000
1fc0: 00000000 00000000 0014c2c4 0000001a 7ee4832e 7ee4832f 003d0f00 76bde0fc
1fe0: 76bddf08 76bddef8 00016680 000509d0
 r10:0000001a r9:8378b000 r8:80200288 r7:0000001a r6:0014c2c4 r5:00000000
 r4:00000000
Code: e30000c8 e3480200 e58dc000 ebfff359 (e7f001f2) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e30000c8 	movw	r0, #200	@ 0xc8
   4:	e3480200 	movt	r0, #33280	@ 0x8200
   8:	e58dc000 	str	ip, [sp]
   c:	ebfff359 	bl	0xffffcd78
* 10:	e7f001f2 	udf	#18 <-- trapping instruction