[moderation] [mm?] general protection fault in lru_gen_test_recent

Hello,

syzbot found the following issue on:

HEAD commit: e72e9e693307 Merge tag 'net-6.15-rc4' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16c5a1b3980000
kernel config: https://syzkaller.appspot.com/x/.config?x=f65c1740d8e72188
dashboard link: https://syzkaller.appspot.com/bug?extid=28e82dfd6e6399c0e620
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
CC: [[email protected] [email protected] [email protected]]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/46efbef938af/disk-e72e9e69.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3e955a323fc7/vmlinux-e72e9e69.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ccb0e9c1e9d6/bzImage-e72e9e69.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]

Oops: general protection fault, probably for non-canonical address 0xdffffc00000009c0: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x0000000000004e00-0x0000000000004e07]
CPU: 0 UID: 0 PID: 9140 Comm: syz.3.743 Tainted: G U 6.15.0-rc3-syzkaller-00076-ge72e9e693307 #0 PREEMPT(full)
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:699 [inline]
RIP: 0010:lru_gen_test_recent+0xee/0x320 mm/workingset.c:275
Code: f8 89 b8 ff 48 85 db 0f 84 79 01 00 00 e8 ea 89 b8 ff 49 8d bd 00 4e 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e a3 01 00 00 4d 63 b5 00 4e 00
RSP: 0018:ffffc90017e07878 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8881412cc000 RCX: ffffc9000d89e000
RDX: 00000000000009c0 RSI: ffffffff82022006 RDI: 0000000000004e00
RBP: ffffc90017e07918 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90017e07938
R13: 0000000000000000 R14: ffffc90017e07908 R15: 00000000000000c8
FS: 00007f6aa07866c0(0000) GS:ffff8881249bf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30cfaff8 CR3: 00000000678ac000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
lru_gen_refault mm/workingset.c:296 [inline]
workingset_refault+0x24f/0xee0 mm/workingset.c:546
filemap_add_folio+0x1ae/0x220 mm/filemap.c:984
do_read_cache_folio+0x239/0x5c0 mm/filemap.c:3852
freader_get_folio+0x337/0x8e0 lib/buildid.c:77
freader_fetch+0xc2/0x5e0 lib/buildid.c:120
__build_id_parse.isra.0+0xec/0x7a0 lib/buildid.c:305
do_procmap_query+0xd96/0x1090 fs/proc/task_mmu.c:534
procfs_procmap_ioctl+0x7d/0xb0 fs/proc/task_mmu.c:613
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl fs/ioctl.c:892 [inline]
__x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6a9f98e969
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:00007f6aa0786038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6a9fbb6080 RCX: 00007f6a9f98e969
RDX: 0000200000000080 RSI: 00000000c0686611 RDI: 0000000000000006
RBP: 00007f6a9fa10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6a9fbb6080 R15: 00007ffdc3aa8be8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:699 [inline]
RIP: 0010:lru_gen_test_recent+0xee/0x320 mm/workingset.c:275
Code: f8 89 b8 ff 48 85 db 0f 84 79 01 00 00 e8 ea 89 b8 ff 49 8d bd 00 4e 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e a3 01 00 00 4d 63 b5 00 4e 00
RSP: 0018:ffffc90017e07878 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff8881412cc000 RCX: ffffc9000d89e000
RDX: 00000000000009c0 RSI: ffffffff82022006 RDI: 0000000000004e00
RBP: ffffc90017e07918 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffc90017e07938
R13: 0000000000000000 R14: ffffc90017e07908 R15: 00000000000000c8
FS: 00007f6aa07866c0(0000) GS:ffff888124abf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a9fb84538 CR3: 00000000678ac000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: f8 clc
1: 89 b8 ff 48 85 db mov %edi,-0x247ab701(%rax)
7: 0f 84 79 01 00 00 je 0x186
d: e8 ea 89 b8 ff call 0xffb889fc
12: 49 8d bd 00 4e 00 00 lea 0x4e00(%r13),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction
2e: 84 c0 test %al,%al
30: 74 08 je 0x3a
32: 3c 03 cmp $0x3,%al
34: 0f 8e a3 01 00 00 jle 0x1dd
3a: 4d rex.WRB
3b: 63 .byte 0x63
3c: b5 00 mov $0x0,%ch
3e: 4e rex.WRX


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