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: 0 UID: 0 PID: 3912 Comm: syz.1.40 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 : dfb39e38  ip : dfb39d78  fp : dfb39e5c
r10: 0000001a  r9 : 8437d400  r8 : 8437b050
r7 : dde90ce0  r6 : 00000000  r5 : 00000074  r4 : 00000050
r3 : 8437d400  r2 : 00000000  r1 : 00000000  r0 : 00000066
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 851e3900  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 8437d400 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 8437b000 pointer offset 80 size 3072
Register r9 information: slab task_struct start 8437d400 pointer offset 0 size 3072
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfb38000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2787
Register r12 information: 2-page vmalloc region starting at 0xdfb38000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2787
Process syz.1.40 (pid: 3912, stack limit = 0xdfb38000)
Stack: (0xdfb39e38 to 0xdfb3a000)
9e20:                                                       8205f678 82030fcc
9e40: 820464dc 00000050 00000074 8437d400 dfb39e8c dfb39e60 804d5d54 819be4f4
9e60: 00000074 dfb39e70 80214800 8437b050 00000074 00000000 8437b0c4 dde90ce0
9e80: dfb39ec4 dfb39e90 80514b34 804d5c88 00000074 00000000 dfb39eb4 8437b050
9ea0: 00000074 00000000 00000000 00000000 8437d400 0000001a dfb39ef4 dfb39ec8
9ec0: 80209db4 805148b8 80200c04 819db038 80000002 00000000 00000000 00000000
9ee0: 0000000c 00000000 dfb39f6c dfb39ef8 8020a468 80209d30 00000000 00000000
9f00: dfb39f10 dfb39f20 819e36b0 802812d0 40000013 ffffffff 802813ec b5403587
9f20: dfb39f54 00000000 8027e354 60000013 81990410 819a7694 dfb39f54 72e30e64
9f40: 0000000f 8437b000 0000000f 72e30e64 8437b000 0000000f 00000000 00000000
9f60: dfb39fa4 dfb39f70 80252fdc 8020a140 80202cc0 72e30e64 dfb39fac 00000000
9f80: 00000000 002862f4 0000001a 8020029c 8437d400 0000001a 00000000 dfb39fa8
9fa0: 80200060 80252db0 00000000 00000000 0000000f 00000040 00000000 00000000
9fc0: 00000000 00000000 002862f4 0000001a 00000000 00006364 003d0f00 76b4e0bc
9fe0: 76b4dec0 76b4deb0 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:dde90ce0 r7:8437b0c4 r6:00000000 r5:00000074 r4:8437b050
[<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 r9:8437d400 r8:00000000 r7:00000000 r6:00000000 r5:00000074
 r4:8437b050
[<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 r4:00000000
[<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 r4:8437b000
[<80252da4>] (sys_ptrace) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfb39fa8 to 0xdfb39ff0)
9fa0:                   00000000 00000000 0000000f 00000040 00000000 00000000
9fc0: 00000000 00000000 002862f4 0000001a 00000000 00006364 003d0f00 76b4e0bc
9fe0: 76b4dec0 76b4deb0 00018af0 00133450
 r10:0000001a r9:8437d400 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