================================================================== BUG: KCSAN: data-race in dd_insert_requests / ll_back_merge_fn write to 0xffff8881018f5c80 of 8 bytes by task 30470 on cpu 1: dd_insert_request block/mq-deadline.c:837 [inline] dd_insert_requests+0x4b1/0x670 block/mq-deadline.c:878 blk_mq_dispatch_plug_list block/blk-mq.c:2750 [inline] blk_mq_flush_plug_list+0x643/0xdc0 block/blk-mq.c:2800 __blk_flush_plug+0x210/0x260 block/blk-core.c:1142 blk_finish_plug+0x47/0x60 block/blk-core.c:1166 swap_cluster_readahead+0x416/0x4c0 mm/swap_state.c:669 swapin_readahead+0xe9/0x7f0 mm/swap_state.c:878 do_swap_page+0x4a0/0x1670 mm/memory.c:3883 handle_pte_fault mm/memory.c:5041 [inline] __handle_mm_fault mm/memory.c:5179 [inline] handle_mm_fault+0xa36/0x2dd0 mm/memory.c:5344 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x3ff/0x6c0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 read to 0xffff8881018f5c80 of 8 bytes by task 30481 on cpu 0: req_set_nomerge block/blk.h:351 [inline] ll_back_merge_fn+0x29c/0x4a0 block/blk-merge.c:647 bio_attempt_back_merge+0x58/0x500 block/blk-merge.c:982 blk_attempt_bio_merge+0x43d/0x480 block/blk-merge.c:1068 blk_attempt_plug_merge+0xb4/0xf0 block/blk-merge.c:1115 blk_mq_attempt_bio_merge block/blk-mq.c:2841 [inline] blk_mq_get_new_requests block/blk-mq.c:2861 [inline] blk_mq_submit_bio+0x3ab/0xd90 block/blk-mq.c:2970 __submit_bio+0x11c/0x350 block/blk-core.c:599 __submit_bio_noacct_mq block/blk-core.c:678 [inline] submit_bio_noacct_nocheck+0x449/0x5e0 block/blk-core.c:707 submit_bio_noacct+0x71c/0x8c0 block/blk-core.c:801 submit_bio+0xb7/0xc0 block/blk-core.c:834 swap_writepage_bdev_async mm/page_io.c:368 [inline] __swap_writepage+0x69d/0xdb0 mm/page_io.c:386 swap_writepage+0x6e/0x120 mm/page_io.c:204 shmem_writepage+0x7a6/0x970 mm/shmem.c:1500 pageout mm/vmscan.c:654 [inline] shrink_folio_list+0x1952/0x2540 mm/vmscan.c:1315 shrink_inactive_list mm/vmscan.c:1913 [inline] shrink_list mm/vmscan.c:2154 [inline] shrink_lruvec+0xd80/0x17a0 mm/vmscan.c:5626 shrink_node_memcgs mm/vmscan.c:5812 [inline] shrink_node+0xab3/0x15c0 mm/vmscan.c:5847 shrink_zones mm/vmscan.c:6086 [inline] do_try_to_free_pages+0x43d/0xce0 mm/vmscan.c:6148 try_to_free_mem_cgroup_pages+0x1e2/0x480 mm/vmscan.c:6463 try_charge_memcg+0x280/0xd30 mm/memcontrol.c:2742 obj_cgroup_charge_pages+0xab/0x130 mm/memcontrol.c:3255 __memcg_kmem_charge_page+0x9c/0x170 mm/memcontrol.c:3281 __alloc_pages+0x1bb/0x340 mm/page_alloc.c:4585 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+0x6d2/0xea0 mm/vmalloc.c:3320 kvmalloc_node+0x121/0x160 mm/util.c:642 kvmalloc include/linux/slab.h:738 [inline] xt_alloc_table_info+0x3d/0x80 net/netfilter/x_tables.c:1192 do_replace net/ipv4/netfilter/arp_tables.c:970 [inline] do_arpt_set_ctl+0x634/0x13b0 net/ipv4/netfilter/arp_tables.c:1421 nf_setsockopt+0x18d/0x1b0 net/netfilter/nf_sockopt.c:101 ip_setsockopt+0xe6/0x100 net/ipv4/ip_sockglue.c:1426 tcp_setsockopt+0x90/0xa0 net/ipv4/tcp.c:3704 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3711 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:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b value changed: 0x0000000000000000 -> 0xffff8881025fa280 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 30481 Comm: syz-executor.0 Not tainted 6.7.0-rc2-syzkaller-00195-g0f5cc96c367f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 ================================================================== syz-executor.0 (30481) used greatest stack depth: 8024 bytes left