Hello, syzbot found the following issue on: HEAD commit: 256abd8e550c Linux 6.10-rc7 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=106f73b9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d41a21b8562873d8 dashboard link: https://syzkaller.appspot.com/bug?extid=da25887cc13da6bf3b8c 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/eb12c934492f/disk-256abd8e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a25b9e666500/vmlinux-256abd8e.xz kernel image: https://storage.googleapis.com/syzbot-assets/ef2e7d0332d0/bzImage-256abd8e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+da25887cc13da6bf3b8c@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in __swap_writepage / scan_swap_map_slots read-write to 0xffff888103c5ee10 of 8 bytes by task 12496 on cpu 0: scan_swap_map_slots+0x51/0x10e0 mm/swapfile.c:868 get_swap_pages+0x30b/0x480 mm/swapfile.c:1115 folio_alloc_swap+0x3b7/0x490 mm/swap_slots.c:346 shmem_writepage+0x43e/0x970 mm/shmem.c:1493 pageout mm/vmscan.c:660 [inline] shrink_folio_list+0x194f/0x2560 mm/vmscan.c:1341 shrink_inactive_list mm/vmscan.c:1944 [inline] shrink_list mm/vmscan.c:2179 [inline] shrink_lruvec+0xbd9/0x15f0 mm/vmscan.c:5703 shrink_node_memcgs mm/vmscan.c:5889 [inline] shrink_node+0x9d1/0x13c0 mm/vmscan.c:5924 shrink_zones mm/vmscan.c:6168 [inline] do_try_to_free_pages+0x3c6/0xc50 mm/vmscan.c:6230 try_to_free_mem_cgroup_pages+0x1eb/0x4e0 mm/vmscan.c:6545 try_charge_memcg+0x27a/0xcd0 mm/memcontrol.c:2944 try_charge mm/memcontrol.c:3092 [inline] charge_memcg mm/memcontrol.c:7495 [inline] __mem_cgroup_charge+0x63/0x100 mm/memcontrol.c:7510 mem_cgroup_charge include/linux/memcontrol.h:691 [inline] shmem_alloc_and_add_folio mm/shmem.c:1677 [inline] shmem_get_folio_gfp+0x480/0xb70 mm/shmem.c:2055 shmem_get_folio mm/shmem.c:2160 [inline] shmem_write_begin+0xa0/0x1c0 mm/shmem.c:2743 generic_perform_write+0x1d5/0x410 mm/filemap.c:4015 shmem_file_write_iter+0xc8/0xf0 mm/shmem.c:2919 __kernel_write_iter+0x24f/0x4e0 fs/read_write.c:523 dump_emit_page fs/coredump.c:893 [inline] dump_user_range+0x3a7/0x550 fs/coredump.c:954 elf_core_dump+0x1aeb/0x1c30 fs/binfmt_elf.c:2083 do_coredump+0xff6/0x1860 fs/coredump.c:767 get_signal+0xdc1/0x1080 kernel/signal.c:2894 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x94/0x130 kernel/entry/common.c:231 irqentry_exit+0x12/0x50 kernel/entry/common.c:334 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 read to 0xffff888103c5ee10 of 8 bytes by task 12516 on cpu 1: __swap_writepage+0x88/0xc50 mm/page_io.c:387 swap_writepage+0xa9/0x160 mm/page_io.c:209 shmem_writepage+0x7be/0x970 mm/shmem.c:1518 pageout mm/vmscan.c:660 [inline] shrink_folio_list+0x194f/0x2560 mm/vmscan.c:1341 shrink_inactive_list mm/vmscan.c:1944 [inline] shrink_list mm/vmscan.c:2179 [inline] shrink_lruvec+0xbd9/0x15f0 mm/vmscan.c:5703 shrink_node_memcgs mm/vmscan.c:5889 [inline] shrink_node+0x9d1/0x13c0 mm/vmscan.c:5924 shrink_zones mm/vmscan.c:6168 [inline] do_try_to_free_pages+0x3c6/0xc50 mm/vmscan.c:6230 try_to_free_mem_cgroup_pages+0x1eb/0x4e0 mm/vmscan.c:6545 try_charge_memcg+0x27a/0xcd0 mm/memcontrol.c:2944 try_charge mm/memcontrol.c:3092 [inline] charge_memcg mm/memcontrol.c:7495 [inline] __mem_cgroup_charge+0x63/0x100 mm/memcontrol.c:7510 mem_cgroup_charge include/linux/memcontrol.h:691 [inline] shmem_alloc_and_add_folio mm/shmem.c:1677 [inline] shmem_get_folio_gfp+0x480/0xb70 mm/shmem.c:2055 shmem_get_folio mm/shmem.c:2160 [inline] shmem_write_begin+0xa0/0x1c0 mm/shmem.c:2743 generic_perform_write+0x1d5/0x410 mm/filemap.c:4015 shmem_file_write_iter+0xc8/0xf0 mm/shmem.c:2919 __kernel_write_iter+0x24f/0x4e0 fs/read_write.c:523 dump_emit_page fs/coredump.c:893 [inline] dump_user_range+0x3a7/0x550 fs/coredump.c:954 elf_core_dump+0x1aeb/0x1c30 fs/binfmt_elf.c:2083 do_coredump+0xff6/0x1860 fs/coredump.c:767 get_signal+0xdc1/0x1080 kernel/signal.c:2894 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x94/0x130 kernel/entry/common.c:231 irqentry_exit+0x12/0x50 kernel/entry/common.c:334 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 value changed: 0x0000000000004083 -> 0x0000000000008083 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 12516 Comm: syz.2.2868 Not tainted 6.10.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
