linux-kernel - [syzbot] [mm?] KCSAN: data-race in compact_zone / isolate_migratepages

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Message-ID: <000000000000300fca061e4ca372@google.com>
Date: Sun, 28 Jul 2024 03:59:24 -0700
From: syzbot <syzbot+763baa6ce76de5853e63@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [mm?] KCSAN: data-race in compact_zone / isolate_migratepages_block
 (4)

Hello,

syzbot found the following issue on:

HEAD commit:    2f8c4f506285 Merge tag 'auxdisplay-for-v6.11-tag1' of git:..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14b56f19980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7398409c79c30d03
dashboard link: https://syzkaller.appspot.com/bug?extid=763baa6ce76de5853e63
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6165da49b7f1/disk-2f8c4f50.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/74fed2ebd154/vmlinux-2f8c4f50.xz
kernel image: https://storage.googleapis.com/syzbot-assets/32a1190d3a94/bzImage-2f8c4f50.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+763baa6ce76de5853e63@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in compact_zone / isolate_migratepages_block

read to 0xffff88823fffab98 of 8 bytes by task 32 on cpu 0:
 update_cached_migrate mm/compaction.c:506 [inline]
 isolate_migratepages_block+0x24e7/0x2740 mm/compaction.c:1358
 isolate_migratepages mm/compaction.c:2194 [inline]
 compact_zone+0x1e1e/0x2930 mm/compaction.c:2641
 kcompactd_do_work mm/compaction.c:3112 [inline]
 kcompactd+0x4e0/0xd40 mm/compaction.c:3211
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

write to 0xffff88823fffab98 of 8 bytes by task 15939 on cpu 1:
 compact_zone+0x23a6/0x2930 mm/compaction.c:2649
 compact_zone_order mm/compaction.c:2806 [inline]
 try_to_compact_pages+0x388/0x920 mm/compaction.c:2862
 __alloc_pages_direct_compact+0x6f/0x1e0 mm/page_alloc.c:3651
 __alloc_pages_slowpath+0x236/0xd70 mm/page_alloc.c:4246
 __alloc_pages_noprof+0x26d/0x360 mm/page_alloc.c:4709
 alloc_pages_mpol_noprof+0xb1/0x1e0 mm/mempolicy.c:2263
 alloc_pages_noprof+0xe1/0x100 mm/mempolicy.c:2343
 vm_area_alloc_pages mm/vmalloc.c:3584 [inline]
 __vmalloc_area_node mm/vmalloc.c:3660 [inline]
 __vmalloc_node_range_noprof+0x719/0xef0 mm/vmalloc.c:3841
 __kvmalloc_node_noprof+0x121/0x170 mm/util.c:675
 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:256
 hash_netiface_create+0x273/0x730 net/netfilter/ipset/ip_set_hash_gen.h:1568
 ip_set_create+0x359/0x8a0 net/netfilter/ipset/ip_set_core.c:1104
 nfnetlink_rcv_msg+0x4a9/0x570 net/netfilter/nfnetlink.c:302
 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2550
 nfnetlink_rcv+0x16c/0x15b0 net/netfilter/nfnetlink.c:664
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x593/0x670 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:745
 ____sys_sendmsg+0x312/0x410 net/socket.c:2597
 ___sys_sendmsg net/socket.c:2651 [inline]
 __sys_sendmsg+0x1e9/0x280 net/socket.c:2680
 __do_sys_sendmsg net/socket.c:2689 [inline]
 __se_sys_sendmsg net/socket.c:2687 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2687
 x64_sys_call+0x26f8/0x2e00 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000001c0c00 -> 0x00000000001c1c00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 15939 Comm: syz.1.2769 Not tainted 6.10.0-syzkaller-12708-g2f8c4f506285 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
==================================================================


---
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