linux-kernel - Re: [syzbot] [mm?] kernel BUG in resv_map

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Message-ID: <ZzNI0ikhneaXRCgY@localhost.localdomain>
Date: Tue, 12 Nov 2024 13:23:46 +0100
From: Oscar Salvador <osalvador@...e.de>
To: syzbot <syzbot+f525fd79634858f478e7@...kaller.appspotmail.com>
Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, muchun.song@...ux.dev,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] kernel BUG in resv_map_release (3)

On Mon, Nov 11, 2024 at 09:16:26PM -0800, syzbot wrote:
> Hello,
... 
> ------------[ cut here ]------------
> kernel BUG at mm/hugetlb.c:1131!
> Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
> CPU: 0 UID: 0 PID: 16399 Comm: syz-executor416 Not tainted 6.12.0-rc6-syzkaller-00169-g906bd684e4b1 #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> RIP: 0010:resv_map_release mm/hugetlb.c:1131 [inline]
> RIP: 0010:resv_map_release+0x1f3/0x290 mm/hugetlb.c:1116
> Code: a4 ff 48 85 db 75 1d e8 ab 1b a4 ff 48 8b 7c 24 08 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 e3 ea fa ff e8 8e 1b a4 ff 90 <0f> 0b 4c 89 ef e8 83 a6 05 00 e9 3d ff ff ff 48 89 ef e8 86 a5 05
> RSP: 0018:ffffc9002634f900 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81e95f9b
> RDX: ffff888020d6c880 RSI: ffffffff81e95fc2 RDI: 0000000000000007
> RBP: ffff88802b289860 R08: 0000000000000007 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802b289860
> R13: ffff88802b289860 R14: ffff888033f4ed88 R15: dead000000000100
> FS:  0000000000000000(0000) GS:ffff88806a600000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fc9bfa142b8 CR3: 000000000df7c000 CR4: 0000000000352ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  kref_put include/linux/kref.h:65 [inline]
>  hugetlb_vm_op_close+0x4a7/0x5b0 mm/hugetlb.c:5075
>  remove_vma+0xa8/0x1a0 mm/vma.c:330
>  exit_mmap+0x4e0/0xb30 mm/mmap.c:1937
>  __mmput+0x12a/0x480 kernel/fork.c:1348
>  mmput+0x62/0x70 kernel/fork.c:1370
>  exit_mm kernel/exit.c:571 [inline]
>  do_exit+0x9bf/0x2d70 kernel/exit.c:926
>  do_group_exit+0xd3/0x2a0 kernel/exit.c:1088
>  get_signal+0x25fb/0x2770 kernel/signal.c:2917
>  arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
>  exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
>  exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
>  __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
>  syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
>  do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7fc9bf9be159
> Code: Unable to access opcode bytes at 0x7fc9bf9be12f.
> RSP: 002b:00007fc9bf957178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
> RAX: fffffffffffffe00 RBX: 00007fc9bfa48338 RCX: 00007fc9bf9be159
> RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc9bfa48338
> RBP: 00007fc9bfa48330 R08: 00007fc9bf9576c0 R09: 00007fc9bf9576c0
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc9bfa4833c
> R13: 000000000000000b R14: 00007ffda7c51e30 R15: 00007ffda7c51f18
>  </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:resv_map_release mm/hugetlb.c:1131 [inline]
> RIP: 0010:resv_map_release+0x1f3/0x290 mm/hugetlb.c:1116
> Code: a4 ff 48 85 db 75 1d e8 ab 1b a4 ff 48 8b 7c 24 08 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f e9 e3 ea fa ff e8 8e 1b a4 ff 90 <0f> 0b 4c 89 ef e8 83 a6 05 00 e9 3d ff ff ff 48 89 ef e8 86 a5 05
> RSP: 0018:ffffc9002634f900 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81e95f9b
> RDX: ffff888020d6c880 RSI: ffffffff81e95fc2 RDI: 0000000000000007
> RBP: ffff88802b289860 R08: 0000000000000007 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802b289860
> R13: ffff88802b289860 R14: ffff888033f4ed88 R15: dead000000000100
> FS:  0000000000000000(0000) GS:ffff88806a700000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007ffda7c52014 CR3: 00000000325ae000 CR4: 0000000000352ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

I can reproduce it locally.

I am having a look right now.


-- 
Oscar Salvador
SUSE Labs