[moderation] [mm?] KCSAN: data-race in try_to_unmap_one / try_to_unmap_one (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3ce9925823c7 Merge tag 'mm-hotfixes-stable-2025-05-10-14-2..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10caf4d4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6154604431d9aaf9
dashboard link: https://syzkaller.appspot.com/bug?extid=5894b4ec1862c09c250a
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
CC: [Liam.H...@oracle.com ak...@linux-foundation.org da...@redhat.com harr...@oracle.com linux-...@vger.kernel.org linu...@kvack.org lorenzo...@oracle.com ri...@surriel.com vba...@suse.cz]

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/afdc6302fc05/disk-3ce99258.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fc7f98d3c420/vmlinux-3ce99258.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ea7ca2da2258/bzImage-3ce99258.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5894b4...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in try_to_unmap_one / try_to_unmap_one

read to 0xffff88810a533800 of 8 bytes by task 9869 on cpu 1:
update_hiwater_rss include/linux/mm.h:2770 [inline]
try_to_unmap_one+0xea2/0x20e0 mm/rmap.c:2061
rmap_walk_anon+0x27d/0x430 mm/rmap.c:2834
rmap_walk mm/rmap.c:2939 [inline]
try_to_unmap+0x13d/0x1e0 mm/rmap.c:2263
shrink_folio_list+0x121a/0x2670 mm/vmscan.c:1373
evict_folios+0x2888/0x33d0 mm/vmscan.c:4698
try_to_shrink_lruvec+0x45a/0x7e0 mm/vmscan.c:4859
lru_gen_shrink_lruvec mm/vmscan.c:5008 [inline]
shrink_lruvec+0x22e/0x1a40 mm/vmscan.c:5753
shrink_node_memcgs mm/vmscan.c:5989 [inline]
shrink_node+0x686/0x2110 mm/vmscan.c:6030
shrink_zones mm/vmscan.c:6274 [inline]
do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6336
try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6664
try_charge_memcg+0x3ab/0x870 mm/memcontrol.c:2304
try_charge mm/memcontrol.c:2446 [inline]
charge_memcg+0x51/0xc0 mm/memcontrol.c:4592
__mem_cgroup_charge+0x28/0xb0 mm/memcontrol.c:4609
mem_cgroup_charge include/linux/memcontrol.h:642 [inline]
shmem_alloc_and_add_folio mm/shmem.c:1903 [inline]
shmem_get_folio_gfp+0x470/0xd40 mm/shmem.c:2533
shmem_fault+0xf6/0x250 mm/shmem.c:2734
__do_fault+0xb9/0x200 mm/memory.c:5098
do_read_fault mm/memory.c:5518 [inline]
do_fault mm/memory.c:5652 [inline]
do_pte_missing mm/memory.c:4160 [inline]
handle_pte_fault mm/memory.c:5997 [inline]
__handle_mm_fault mm/memory.c:6140 [inline]
handle_mm_fault+0x110c/0x2ae0 mm/memory.c:6309
faultin_page mm/gup.c:1193 [inline]
__get_user_pages+0xde2/0x1d20 mm/gup.c:1491
populate_vma_page_range mm/gup.c:1929 [inline]
__mm_populate+0x243/0x3a0 mm/gup.c:2032
mm_populate include/linux/mm.h:3487 [inline]
vm_mmap_pgoff+0x232/0x2e0 mm/util.c:584
ksys_mmap_pgoff+0xc2/0x310 mm/mmap.c:607
x64_sys_call+0x1602/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:10
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff88810a533800 of 8 bytes by task 9863 on cpu 0:
update_hiwater_rss include/linux/mm.h:2771 [inline]
try_to_unmap_one+0xec2/0x20e0 mm/rmap.c:2061
rmap_walk_anon+0x27d/0x430 mm/rmap.c:2834
rmap_walk mm/rmap.c:2939 [inline]
try_to_unmap+0x13d/0x1e0 mm/rmap.c:2263
shrink_folio_list+0x121a/0x2670 mm/vmscan.c:1373
evict_folios+0x2888/0x33d0 mm/vmscan.c:4698
try_to_shrink_lruvec+0x45a/0x7e0 mm/vmscan.c:4859
lru_gen_shrink_lruvec mm/vmscan.c:5008 [inline]
shrink_lruvec+0x22e/0x1a40 mm/vmscan.c:5753
shrink_node_memcgs mm/vmscan.c:5989 [inline]
shrink_node+0x686/0x2110 mm/vmscan.c:6030
shrink_zones mm/vmscan.c:6274 [inline]
do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6336
try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6664
try_charge_memcg+0x3ab/0x870 mm/memcontrol.c:2304
obj_cgroup_charge_pages+0xb7/0x1a0 mm/memcontrol.c:2695
__memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2739
__alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:4987
alloc_pages_mpol+0xb3/0x250 mm/mempolicy.c:2301
alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline]
alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2392
vm_area_alloc_pages mm/vmalloc.c:3592 [inline]
__vmalloc_area_node mm/vmalloc.c:3670 [inline]
__vmalloc_node_range_noprof+0x6a4/0xdf0 mm/vmalloc.c:3845
__kvmalloc_node_noprof+0x2f3/0x4d0 mm/slub.c:5034
ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261
hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568
ip_set_create+0x3c9/0x960 net/netfilter/ipset/ip_set_core.c:1109
nfnetlink_rcv_msg+0x4c3/0x590 net/netfilter/nfnetlink.c:302
netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2534
nfnetlink_rcv+0x16b/0x1690 net/netfilter/nfnetlink.c:667
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x59e/0x670 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x142/0x180 net/socket.c:727
____sys_sendmsg+0x31e/0x4e0 net/socket.c:2566
___sys_sendmsg+0x17b/0x1d0 net/socket.c:2620
__sys_sendmsg net/socket.c:2652 [inline]
__do_sys_sendmsg net/socket.c:2657 [inline]
__se_sys_sendmsg net/socket.c:2655 [inline]
__x64_sys_sendmsg+0xd4/0x160 net/socket.c:2655
x64_sys_call+0x2999/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:47
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd0/0x1a0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000001cb4 -> 0x0000000000001e54

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9863 Comm: syz.1.2163 Not tainted 6.15.0-rc5-syzkaller-00300-g3ce9925823c7 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
==================================================================
syz.1.2163 (9863) used greatest stack depth: 4848 bytes left


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.