Hello, syzbot found the following issue on: HEAD commit: 39cd87c4eb2b Linux 6.9-rc2 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=129de21d180000 kernel config: https://syzkaller.appspot.com/x/.config?x=d024e89f7bb376ce dashboard link: https://syzkaller.appspot.com/bug?extid=58fc2a881f3b3df5e336 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/b9b2dcffd7d5/disk-39cd87c4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5f4981fa60e6/vmlinux-39cd87c4.xz kernel image: https://storage.googleapis.com/syzbot-assets/691f671f70ad/bzImage-39cd87c4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+58fc2a881f3b3df5e336@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in __delete_from_swap_cache / folio_mapping write to 0xffffea0004798fa8 of 8 bytes by task 29 on cpu 0: __delete_from_swap_cache+0x1f2/0x290 mm/swap_state.c:161 delete_from_swap_cache+0x72/0xe0 mm/swap_state.c:241 folio_free_swap+0x19f/0x1c0 mm/swapfile.c:1600 free_swap_cache mm/swap_state.c:290 [inline] free_pages_and_swap_cache+0x1d9/0x400 mm/swap_state.c:322 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x2cf/0x440 mm/mmu_gather.c:373 tlb_finish_mmu+0x8c/0x100 mm/mmu_gather.c:465 __oom_reap_task_mm+0x231/0x2e0 mm/oom_kill.c:553 oom_reap_task_mm mm/oom_kill.c:589 [inline] oom_reap_task mm/oom_kill.c:613 [inline] oom_reaper+0x264/0x850 mm/oom_kill.c:654 kthread+0x1d1/0x210 kernel/kthread.c:388 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 read to 0xffffea0004798fa8 of 8 bytes by task 14567 on cpu 1: folio_mapping+0xd2/0x110 mm/util.c:797 folio_evictable mm/internal.h:256 [inline] move_folios_to_lru+0x137/0x690 mm/vmscan.c:1808 shrink_inactive_list mm/vmscan.c:1929 [inline] shrink_list mm/vmscan.c:2163 [inline] shrink_lruvec+0xbd8/0x1640 mm/vmscan.c:5687 shrink_node_memcgs mm/vmscan.c:5873 [inline] shrink_node+0xa78/0x15a0 mm/vmscan.c:5908 shrink_zones mm/vmscan.c:6152 [inline] do_try_to_free_pages+0x3cc/0xca0 mm/vmscan.c:6214 try_to_free_mem_cgroup_pages+0x1eb/0x4e0 mm/vmscan.c:6529 try_charge_memcg+0x279/0xd10 mm/memcontrol.c:2783 try_charge mm/memcontrol.c:2931 [inline] charge_memcg mm/memcontrol.c:7284 [inline] mem_cgroup_swapin_charge_folio+0x107/0x1a0 mm/memcontrol.c:7369 __read_swap_cache_async+0x2b9/0x520 mm/swap_state.c:514 swap_cluster_readahead+0x276/0x3f0 mm/swap_state.c:678 swapin_readahead+0xe2/0x7a0 mm/swap_state.c:904 do_swap_page+0x3bb/0x15f0 mm/memory.c:4048 handle_pte_fault mm/memory.c:5303 [inline] __handle_mm_fault mm/memory.c:5441 [inline] handle_mm_fault+0x7fa/0x27e0 mm/memory.c:5606 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2f5/0x6d0 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 __get_user_8+0x11/0x20 arch/x86/lib/getuser.S:85 rseq_get_rseq_cs kernel/rseq.c:161 [inline] rseq_ip_fixup kernel/rseq.c:281 [inline] __rseq_handle_notify_resume+0xc8/0xc00 kernel/rseq.c:329 rseq_handle_notify_resume include/linux/rseq.h:38 [inline] resume_user_mode_work include/linux/resume_user_mode.h:62 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x90/0x130 kernel/entry/common.c:218 do_syscall_64+0xe2/0x1d0 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x72/0x7a value changed: 0x0000000000001198 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 14567 Comm: syz-executor.1 Tainted: G W 6.9.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 ================================================================== --- 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
