linux-kernel - [syzbot] [mm?] KCSAN: data-race in __delete_from_swap_cache / folio

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Message-ID: <0000000000000b8cf30610500bf9@google.com>
Date: Thu, 01 Feb 2024 03:10:28 -0800
From: syzbot <syzbot+cf119d1637f0bd53608c@...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 __delete_from_swap_cache /
 folio_mapping (2)

Hello,

syzbot found the following issue on:

HEAD commit:    1bbb19b6eb1b Merge tag 'erofs-for-6.8-rc3-fixes' of git://..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16f1c72fe80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4aab723d3dfffc44
dashboard link: https://syzkaller.appspot.com/bug?extid=cf119d1637f0bd53608c
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/8f79e8ff3cf7/disk-1bbb19b6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ca27972976b4/vmlinux-1bbb19b6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dce27549b82b/bzImage-1bbb19b6.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cf119d1637f0bd53608c@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in __delete_from_swap_cache / folio_mapping

write to 0xffffea0004e7c468 of 8 bytes by task 24368 on cpu 1:
 __delete_from_swap_cache+0x1f2/0x290 mm/swap_state.c:160
 delete_from_swap_cache+0x72/0xd0 mm/swap_state.c:240
 folio_free_swap+0x19f/0x1c0 mm/swapfile.c:1590
 do_swap_page+0xaf3/0x1530 mm/memory.c:4052
 handle_pte_fault mm/memory.c:5147 [inline]
 __handle_mm_fault mm/memory.c:5285 [inline]
 handle_mm_fault+0x7f6/0x27c0 mm/memory.c:5450
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x401/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

read to 0xffffea0004e7c468 of 8 bytes by task 24369 on cpu 0:
 folio_mapping+0xca/0x110 mm/util.c:780
 folio_evictable mm/internal.h:162 [inline]
 move_folios_to_lru+0x132/0x690 mm/vmscan.c:1801
 shrink_active_list+0x580/0x820 mm/vmscan.c:2069
 shrink_list mm/vmscan.c:2149 [inline]
 shrink_lruvec+0x993/0x17a0 mm/vmscan.c:5681
 shrink_node_memcgs mm/vmscan.c:5867 [inline]
 shrink_node+0xac3/0x15d0 mm/vmscan.c:5902
 shrink_zones mm/vmscan.c:6141 [inline]
 do_try_to_free_pages+0x43d/0xce0 mm/vmscan.c:6203
 try_to_free_mem_cgroup_pages+0x1e2/0x480 mm/vmscan.c:6518
 try_charge_memcg+0x280/0xd20 mm/memcontrol.c:2777
 obj_cgroup_charge_pages+0xbd/0x1c0 mm/memcontrol.c:3296
 __memcg_kmem_charge_page+0x9c/0x170 mm/memcontrol.c:3322
 __alloc_pages+0x1bb/0x340 mm/page_alloc.c:4584
 alloc_pages_mpol+0xb1/0x1d0 mm/mempolicy.c:2133
 alloc_pages+0xe0/0x100 mm/mempolicy.c:2204
 vm_area_alloc_pages mm/vmalloc.c:3063 [inline]
 __vmalloc_area_node mm/vmalloc.c:3139 [inline]
 __vmalloc_node_range+0x6ee/0xec0 mm/vmalloc.c:3320
 kvmalloc_node+0x121/0x170 mm/util.c:642
 kvmalloc include/linux/slab.h:728 [inline]
 xt_alloc_table_info+0x3d/0x80 net/netfilter/x_tables.c:1192
 do_replace net/ipv6/netfilter/ip6_tables.c:1139 [inline]
 do_ip6t_set_ctl+0x633/0x1800 net/ipv6/netfilter/ip6_tables.c:1636
 nf_setsockopt+0x18d/0x1b0 net/netfilter/nf_sockopt.c:101
 ipv6_setsockopt+0x11c/0x130 net/ipv6/ipv6_sockglue.c:997
 tcp_setsockopt+0x90/0xa0 net/ipv4/tcp.c:3724
 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3716
 do_sock_setsockopt net/socket.c:2311 [inline]
 __sys_setsockopt+0x1d4/0x240 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0x66/0x80 net/socket.c:2340
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0000000000001805 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 24369 Comm: syz-executor.4 Not tainted 6.8.0-rc2-syzkaller-00047-g1bbb19b6eb1b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
==================================================================


---
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