linux-kernel - Re: [syzbot] [mm?] WARNING in __folio_rmap_sanity

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Message-ID: <676f84f5.050a0220.2f3838.0493.GAE@google.com>
Date: Fri, 27 Dec 2024 20:56:21 -0800
From: syzbot <syzbot+c0673e1f1f054fac28c2@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, david@...hat.com, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, syzkaller-bugs@...glegroups.com, willy@...radead.org
Subject: Re: [syzbot] [mm?] WARNING in __folio_rmap_sanity_checks (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    8155b4ef3466 Add linux-next specific files for 20241220
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15248af8580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9c90bb7161a56c88
dashboard link: https://syzkaller.appspot.com/bug?extid=c0673e1f1f054fac28c2
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1652fadf980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/98a974fc662d/disk-8155b4ef.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2dea9b72f624/vmlinux-8155b4ef.xz
kernel image: https://storage.googleapis.com/syzbot-assets/593a42b9eb34/bzImage-8155b4ef.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/07bcc698db35/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c0673e1f1f054fac28c2@...kaller.appspotmail.com

 do_ftruncate+0x4a1/0x540 fs/open.c:192
 do_sys_ftruncate fs/open.c:207 [inline]
 __do_sys_ftruncate fs/open.c:212 [inline]
 __se_sys_ftruncate fs/open.c:210 [inline]
 __x64_sys_ftruncate+0x94/0xf0 fs/open.c:210
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
------------[ cut here ]------------
WARNING: CPU: 0 PID: 7889 at ./include/linux/rmap.h:216 __folio_rmap_sanity_checks+0x33f/0x590 include/linux/rmap.h:216
Modules linked in:
CPU: 0 UID: 0 PID: 7889 Comm: syz.0.163 Not tainted 6.13.0-rc3-next-20241220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__folio_rmap_sanity_checks+0x33f/0x590 include/linux/rmap.h:216
Code: 0f 0b 90 e9 b7 fd ff ff e8 8e cb ab ff 48 ff cb e9 f8 fd ff ff e8 81 cb ab ff 4c 89 e7 48 c7 c6 00 a7 15 8c e8 32 a4 f5 ff 90 <0f> 0b 90 e9 e9 fd ff ff e8 64 cb ab ff 48 ff cb e9 34 fe ff ff e8
RSP: 0018:ffffc90002f26fd8 EFLAGS: 00010246
RAX: 2a0e9269706cf300 RBX: ffffea00014280c0 RCX: ffffc90002f26b03
RDX: 0000000000000005 RSI: ffffffff8c0aaba0 RDI: ffffffff8c5fed00
RBP: 00000000000131bb R08: ffffffff901ab1f7 R09: 1ffffffff203563e
R10: dffffc0000000000 R11: fffffbfff203563f R12: ffffea0001420000
R13: ffffea00014280c0 R14: 0000000000000000 R15: 00000000000001fc
FS:  00007f75ef9f16c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020a56000 CR3: 00000000642f0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __folio_add_rmap mm/rmap.c:1170 [inline]
 __folio_add_file_rmap mm/rmap.c:1489 [inline]
 folio_add_file_rmap_ptes+0x82/0x380 mm/rmap.c:1511
 set_pte_range+0x30c/0x750 mm/memory.c:5136
 filemap_map_folio_range mm/filemap.c:3639 [inline]
 filemap_map_pages+0xfbe/0x1900 mm/filemap.c:3748
 do_fault_around mm/memory.c:5351 [inline]
 do_read_fault mm/memory.c:5384 [inline]
 do_fault mm/memory.c:5527 [inline]
 do_pte_missing mm/memory.c:4048 [inline]
 handle_pte_fault+0x3888/0x5ee0 mm/memory.c:5890
 __handle_mm_fault mm/memory.c:6033 [inline]
 handle_mm_fault+0x11f5/0x1d50 mm/memory.c:6202
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0x1a92/0x4140 mm/gup.c:1491
 populate_vma_page_range+0x264/0x330 mm/gup.c:1929
 __mm_populate+0x27a/0x460 mm/gup.c:2032
 mm_populate include/linux/mm.h:3400 [inline]
 vm_mmap_pgoff+0x303/0x430 mm/util.c:585
 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:607
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f75eeb85d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f75ef9f1038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f75eed76080 RCX: 00007f75eeb85d29
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f75eec01b08 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f75eed76080 R15: 00007ffd2129f438
 </TASK>


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.