linux-kernel - [syzbot] [mm?] KCSAN: data-race in __reset_isolation_suitable / compact

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Message-ID: <000000000000d27fe1062030a2b5@google.com>
Date: Wed, 21 Aug 2024 05:25:22 -0700
From: syzbot <syzbot+6e54fc669e2c440731fd@...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 __reset_isolation_suitable /
 compact_zone (2)

Hello,

syzbot found the following issue on:

HEAD commit:    b311c1b497e5 Merge tag '6.11-rc4-server-fixes' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=140ca7c5980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3aa0f597417bf8c7
dashboard link: https://syzkaller.appspot.com/bug?extid=6e54fc669e2c440731fd
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/806c87e93e26/disk-b311c1b4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/73951ff34e6d/vmlinux-b311c1b4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f4b7546a486d/bzImage-b311c1b4.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6e54fc669e2c440731fd@...kaller.appspotmail.com

EXT4-fs (loop2): stripe (7) is not aligned with cluster size (16), stripe is disabled
EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
==================================================================
BUG: KCSAN: data-race in __reset_isolation_suitable / compact_zone

write to 0xffff88823fffab90 of 8 bytes by task 77 on cpu 0:
 __reset_isolation_suitable+0x149/0x2b0 mm/compaction.c:438
 reset_isolation_suitable+0xb2/0x100 mm/compaction.c:469
 kswapd_try_to_sleep mm/vmscan.c:7084 [inline]
 kswapd+0x296/0x1820 mm/vmscan.c:7193
 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 0xffff88823fffab90 of 8 bytes by task 28833 on cpu 1:
 update_cached_migrate mm/compaction.c:504 [inline]
 isolate_migratepages mm/compaction.c:2189 [inline]
 compact_zone+0x1293/0x2930 mm/compaction.c:2641
 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:3650
 __alloc_pages_slowpath+0x236/0xd70 mm/page_alloc.c:4245
 __alloc_pages_noprof+0x26d/0x360 mm/page_alloc.c:4708
 alloc_pages_preferred_many mm/mempolicy.c:2204 [inline]
 alloc_pages_mpol_noprof+0xec/0x1e0 mm/mempolicy.c:2228
 alloc_pages_noprof+0xe1/0x100 mm/mempolicy.c:2343
 vm_area_alloc_pages mm/vmalloc.c:3584 [inline]
 __vmalloc_area_node mm/vmalloc.c:3653 [inline]
 __vmalloc_node_range_noprof+0x736/0xec0 mm/vmalloc.c:3834
 __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/0x15e0 net/netfilter/nfnetlink.c:667
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x599/0x670 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+0x2689/0x2d60 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: 0x0000000000196e00 -> 0x0000000000105a00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 28833 Comm: syz.2.8522 Not tainted 6.11.0-rc4-syzkaller-00019-gb311c1b497e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.


---
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