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

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Message-ID: <67820c66.050a0220.d0267.003e.GAE@google.com>
Date: Fri, 10 Jan 2025 22:15:02 -0800
From: syzbot <syzbot+c0673e1f1f054fac28c2@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, david@...hat.com, hdanton@...a.com, 
	liam.howlett@...cle.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)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in __folio_rmap_sanity_checks

 do_truncate fs/open.c:65 [inline]
 do_ftruncate+0x462/0x580 fs/open.c:181
 do_sys_ftruncate fs/open.c:196 [inline]
 __do_sys_ftruncate fs/open.c:201 [inline]
 __se_sys_ftruncate fs/open.c:199 [inline]
 __x64_sys_ftruncate+0x94/0xf0 fs/open.c:199
 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: 1 PID: 10938 at ./include/linux/rmap.h:216 __folio_rmap_sanity_checks+0x33f/0x590 include/linux/rmap.h:216
Modules linked in:
CPU: 1 UID: 0 PID: 10938 Comm: syz.0.314 Not tainted 6.13.0-rc6-syzkaller-g0703fa3785f1 #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 0e c3 ab ff 48 ff cb e9 f8 fd ff ff e8 01 c3 ab ff 4c 89 e7 48 c7 c6 80 9f 15 8c e8 f2 95 f5 ff 90 <0f> 0b 90 e9 e9 fd ff ff e8 e4 c2 ab ff 48 ff cb e9 34 fe ff ff e8
RSP: 0018:ffffc9000cdff098 EFLAGS: 00010246
RAX: fddae3826e06a400 RBX: ffffea0001450100 RCX: ffffc9000cdfec03
RDX: 0000000000000005 RSI: ffffffff8c0aa1e0 RDI: ffffffff8c5fb3a0
RBP: 000000000001318a R08: ffffffff901988f7 R09: 1ffffffff203311e
R10: dffffc0000000000 R11: fffffbfff203311f R12: ffffea0001438000
R13: ffffea0001450100 R14: 0000000000000000 R15: 0000000000000003
FS:  00007f40ae2076c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558cd15608 CR3: 0000000029cd0000 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:5134
 filemap_map_folio_range mm/filemap.c:3620 [inline]
 filemap_map_pages+0xfbb/0x1900 mm/filemap.c:3729
 do_fault_around mm/memory.c:5349 [inline]
 do_read_fault mm/memory.c:5382 [inline]
 do_fault mm/memory.c:5525 [inline]
 do_pte_missing mm/memory.c:4046 [inline]
 handle_pte_fault mm/memory.c:5870 [inline]
 __handle_mm_fault+0x3f4e/0x6ee0 mm/memory.c:6013
 handle_mm_fault+0x3e2/0x8c0 mm/memory.c:6182
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0x1a8f/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:3470 [inline]
 vm_mmap_pgoff+0x303/0x430 mm/util.c:580
 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: 0033:0x7f40ad385d29
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:00007f40ae207038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f40ad576080 RCX: 00007f40ad385d29
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f40ad401b08 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f40ad576080 R15: 00007ffe9513a848
 </TASK>


Tested on:

commit:         0703fa37 mm: remove PageTransTail()
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm mm-unstable
console output: https://syzkaller.appspot.com/x/log.txt?x=11a391df980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9a23460a3770d89c
dashboard link: https://syzkaller.appspot.com/bug?extid=c0673e1f1f054fac28c2
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.