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

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Message-ID: <676fecf2.050a0220.226966.00ad.GAE@google.com>
Date: Sat, 28 Dec 2024 04:20:02 -0800
From: syzbot <syzbot+c0673e1f1f054fac28c2@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
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_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: 8512 at ./include/linux/rmap.h:222 __folio_rmap_sanity_checks+0x52a/0xb30 include/linux/rmap.h:222
Modules linked in:
CPU: 0 UID: 0 PID: 8512 Comm: syz.4.115 Not tainted 6.13.0-rc3-next-20241220-syzkaller-05236-g8155b4ef3466-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:__folio_rmap_sanity_checks+0x52a/0xb30 include/linux/rmap.h:222
Code: 49 ff cd e9 29 fd ff ff e8 e3 c3 ab ff 48 ff cd e9 6b fd ff ff e8 d6 c3 ab ff 4c 89 e7 48 c7 c6 60 aa 15 8c e8 87 9c f5 ff 90 <0f> 0b 90 e9 66 fd ff ff e8 b9 c3 ab ff 48 ff cd e9 a6 fd ff ff e8
RSP: 0018:ffffc9000d986fb8 EFLAGS: 00010246
RAX: 9579638a77c65000 RBX: 00000000000001f8 RCX: ffffc9000d986b03
RDX: 0000000000000005 RSI: ffffffff8c0aac20 RDI: ffffffff8c5ff180
RBP: ffffea00014d8200 R08: ffffffff901ab2f7 R09: 1ffffffff203565e
R10: dffffc0000000000 R11: fffffbfff203565f R12: ffffea00014d0000
R13: ffffea00014d8200 R14: dffffc0000000000 R15: ffffea00014d8200
FS:  00007f399ed686c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555898e7808 CR3: 00000000776f0000 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: 0033:0x7f399df85d29
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:00007f399ed68038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f399e175fa0 RCX: 00007f399df85d29
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f399e001b08 R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f399e175fa0 R15: 00007fff8d381608
 </TASK>


Tested on:

commit:         8155b4ef Add linux-next specific files for 20241220
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12d84818580000
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=12c850b0580000