Re: [syzbot] Re: [syzbot] [maple-tree?] BUG: unable to handle kernel paging request in mas_walk

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Subject: Re: [syzbot] [maple-tree?] BUG: unable to handle kernel paging request in mas_walk
Author: liam.howlett@xxxxxxxxxx

* syzbot <syzbot+c67d06ab25a9bc4adf35@xxxxxxxxxxxxxxxxxxxxxxxxx> [240603 22:23]:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    4a4be1ad3a6e Revert "vfs: Delete the associated dentry whe..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=128638ba980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bd6024aedb15e15c
> dashboard link: https://syzkaller.appspot.com/bug?extid=c67d06ab25a9bc4adf35
> compiler:       aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=106f71aa980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16b4ffc6980000
> 
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-4a4be1ad.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/75957361122b/vmlinux-4a4be1ad.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/6c766b0ec377/Image-4a4be1ad.gz.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+c67d06ab25a9bc4adf35@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> Unable to handle kernel paging request at virtual address 00700000077b9b78

#syz test: git://git.infradead.org/users/jedix/linux-maple.git syz_20240603

> Mem abort info:
>   ESR = 0x0000000096000004
>   EC = 0x25: DABT (current EL), IL = 32 bits
>   SET = 0, FnV = 0
>   EA = 0, S1PTW = 0
>   FSC = 0x04: level 0 translation fault
> Data abort info:
>   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
>   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
>   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> [00700000077b9b78] address between user and kernel address ranges
> Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 1 PID: 3186 Comm: syz-executor162 Not tainted 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0
> Hardware name: linux,dummy-virt (DT)
> pstate: 81400009 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
> pc : ma_data_end lib/maple_tree.c:1419 [inline]
> pc : mtree_range_walk lib/maple_tree.c:2771 [inline]
> pc : mas_state_walk lib/maple_tree.c:3678 [inline]
> pc : mas_walk+0x194/0x328 lib/maple_tree.c:4909
> lr : lock_vma_under_rcu+0x58/0x134 mm/memory.c:5840
> sp : ffff800088cabd50
> x29: ffff800088cabd50 x28: f2f0000005e50000 x27: 0000000000000000
> x26: 0000000000000004 x25: f7f0000005c03900 x24: 0000000082000007
> x23: 0000ffff82687800 x22: 0000000000000354 x21: 0000ffff82687800
> x20: 0000ffff82687800 x19: ffff800088cabeb0 x18: ff7ffffffffffbff
> x17: 0000aaaadab2dc00 x16: 1e4e000000ef7371 x15: 0000000000000001
> x14: ffffffffffffffff x13: 0000000000000000 x12: ffff800081e3d1e8
> x11: 0000000000000001 x10: f2700000077b9b8c x9 : f2700000077b9b00
> x8 : 0000ffff82687800 x7 : 0000000000000001 x6 : 000000000000000e
> x5 : 0000000000000001 x4 : ffff800088cabd78 x3 : 0000aaaadab2dc00
> x2 : 000000000000000e x1 : 000000000000000f x0 : f2700000077b9b08
> Call trace:
>  ma_data_end lib/maple_tree.c:1418 [inline]
>  mtree_range_walk lib/maple_tree.c:2771 [inline]
>  mas_state_walk lib/maple_tree.c:3678 [inline]
>  mas_walk+0x194/0x328 lib/maple_tree.c:4909
>  do_page_fault+0xd4/0x480 arch/arm64/mm/fault.c:567
>  do_translation_fault+0xac/0xbc arch/arm64/mm/fault.c:690
>  do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:826
>  el0_ia+0xa4/0x118 arch/arm64/kernel/entry-common.c:598
>  el0t_64_sync_handler+0xd0/0x12c arch/arm64/kernel/entry-common.c:736
>  el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598
> Code: 91002120 51000426 92401cc2 12001cc6 (f8627802) 
> ---[ end trace 0000000000000000 ]---
> ----------------
> Code disassembly (best guess):
>    0:	91002120 	add	x0, x9, #0x8
>    4:	51000426 	sub	w6, w1, #0x1
>    8:	92401cc2 	and	x2, x6, #0xff
>    c:	12001cc6 	and	w6, w6, #0xff
> * 10:	f8627802 	ldr	x2, [x0, x2, lsl #3] <-- trapping instruction
> 
> 
> ---
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