Hello, syzbot found the following issue on: HEAD commit: c3f2d783a459 Merge tag 'mm-hotfixes-stable-2024-08-17-19-3.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16475bd3980000 kernel config: https://syzkaller.appspot.com/x/.config?x=77bd8f74037eecb dashboard link: https://syzkaller.appspot.com/bug?extid=55b80301d2f1b98738ce 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/7d33f08b7d45/disk-c3f2d783.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/06f0ae9609a1/vmlinux-c3f2d783.xz kernel image: https://storage.googleapis.com/syzbot-assets/e319fa11563c/bzImage-c3f2d783.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+55b80301d2f1b98738ce@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in do_sync_mmap_readahead / do_sync_mmap_readahead write to 0xffff88810f822480 of 4 bytes by task 4192 on cpu 0: do_sync_mmap_readahead+0x236/0x2a0 mm/filemap.c:3172 filemap_fault+0x331/0xa60 mm/filemap.c:3314 __do_fault+0xb6/0x200 mm/memory.c:4655 do_shared_fault mm/memory.c:5121 [inline] do_fault mm/memory.c:5195 [inline] do_pte_missing mm/memory.c:3947 [inline] handle_pte_fault mm/memory.c:5521 [inline] __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0xc0a/0x2940 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:57 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline] _inline_copy_to_user include/linux/uaccess.h:181 [inline] _copy_to_user+0x77/0xa0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:209 [inline] put_timespec64+0x64/0xb0 kernel/time/time.c:910 __do_sys_clock_gettime kernel/time/posix-timers.c:1144 [inline] __se_sys_clock_gettime kernel/time/posix-timers.c:1132 [inline] __x64_sys_clock_gettime+0x138/0x180 kernel/time/posix-timers.c:1132 x64_sys_call+0x27b5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:229 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff88810f822480 of 4 bytes by task 4191 on cpu 1: do_sync_mmap_readahead+0x236/0x2a0 mm/filemap.c:3172 filemap_fault+0x331/0xa60 mm/filemap.c:3314 __do_fault+0xb6/0x200 mm/memory.c:4655 do_shared_fault mm/memory.c:5121 [inline] do_fault mm/memory.c:5195 [inline] do_pte_missing mm/memory.c:3947 [inline] handle_pte_fault mm/memory.c:5521 [inline] __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0xc0a/0x2940 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x296/0x650 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:57 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline] _inline_copy_to_user include/linux/uaccess.h:181 [inline] _copy_to_user+0x77/0xa0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:209 [inline] put_timespec64+0x64/0xb0 kernel/time/time.c:910 __do_sys_clock_gettime kernel/time/posix-timers.c:1144 [inline] __se_sys_clock_gettime kernel/time/posix-timers.c:1132 [inline] __x64_sys_clock_gettime+0x138/0x180 kernel/time/posix-timers.c:1132 x64_sys_call+0x27b5/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:229 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000 -> 0x00000020 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 4191 Comm: syz.0.141 Not tainted 6.11.0-rc3-syzkaller-00338-gc3f2d783a459 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 ================================================================== --- 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
