================================================================== BUG: KCSAN: data-race in relay_switch_subbuf / relay_switch_subbuf write to 0xffff88813ab8ae38 of 8 bytes by task 2952 on cpu 0: relay_switch_subbuf+0x399/0x3a0 kernel/relay.c:708 relay_reserve include/linux/relay.h:248 [inline] __blk_add_trace+0x665/0x720 kernel/trace/blktrace.c:276 blk_add_trace_bio_remap+0x161/0x170 kernel/trace/blktrace.c:1021 trace_block_bio_remap include/trace/events/block.h:507 [inline] blk_partition_remap block/blk-core.c:559 [inline] submit_bio_noacct+0x85e/0x8c0 block/blk-core.c:750 submit_bio+0xb7/0xc0 block/blk-core.c:842 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:1517 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:5656 shrink_node_memcgs mm/vmscan.c:5842 [inline] shrink_node+0xab3/0x15c0 mm/vmscan.c:5877 shrink_zones mm/vmscan.c:6116 [inline] do_try_to_free_pages+0x43d/0xce0 mm/vmscan.c:6178 try_to_free_mem_cgroup_pages+0x1e2/0x480 mm/vmscan.c:6493 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:3724 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3719 do_sock_setsockopt net/socket.c:2313 [inline] __sys_setsockopt+0x1d4/0x240 net/socket.c:2336 __do_sys_setsockopt net/socket.c:2345 [inline] __se_sys_setsockopt net/socket.c:2342 [inline] __x64_sys_setsockopt+0x66/0x80 net/socket.c:2342 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b write to 0xffff88813ab8ae38 of 8 bytes by task 2975 on cpu 1: relay_switch_subbuf+0x399/0x3a0 kernel/relay.c:708 relay_reserve include/linux/relay.h:248 [inline] __blk_add_trace+0x665/0x720 kernel/trace/blktrace.c:276 blk_add_trace_bio kernel/trace/blktrace.c:903 [inline] blk_add_trace_bio_queue+0x12c/0x140 kernel/trace/blktrace.c:935 trace_block_bio_queue include/trace/events/block.h:383 [inline] submit_bio_noacct_nocheck+0x57d/0x5e0 block/blk-core.c:698 submit_bio_noacct+0x70c/0x8c0 block/blk-core.c:809 submit_bio+0xb7/0xc0 block/blk-core.c:842 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:1517 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:5656 shrink_node_memcgs mm/vmscan.c:5842 [inline] shrink_node+0xab3/0x15c0 mm/vmscan.c:5877 shrink_zones mm/vmscan.c:6116 [inline] do_try_to_free_pages+0x43d/0xce0 mm/vmscan.c:6178 try_to_free_mem_cgroup_pages+0x1e2/0x480 mm/vmscan.c:6493 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:3724 sock_common_setsockopt+0x61/0x70 net/core/sock.c:3719 do_sock_setsockopt net/socket.c:2313 [inline] __sys_setsockopt+0x1d4/0x240 net/socket.c:2336 __do_sys_setsockopt net/socket.c:2345 [inline] __se_sys_setsockopt net/socket.c:2342 [inline] __x64_sys_setsockopt+0x66/0x80 net/socket.c:2342 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b value changed: 0x0000000000000040 -> 0x0000000000000030 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2975 Comm: syz-executor.1 Tainted: G W 6.7.0-rc8-syzkaller-00159-ga4ab2706bb12 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 ================================================================== syz-executor.1 (2975) used greatest stack depth: 8192 bytes left