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Fri, 06 Sep 2024 03:46:27 -0700 (PDT) Date: Fri, 06 Sep 2024 03:46:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008b6aa30621711e8f@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in do_sync_mmap_readahead / do_sync_mmap_readahead (7) From: syzbot To: jstultz@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, sboyd@kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Stat-Signature: deqgog7frtqkmroqixoc5fazhmuz35iw X-Rspamd-Queue-Id: B464B120023 X-Rspamd-Server: rspam02 X-HE-Tag: 1725619588-981992 X-HE-Meta: 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 Ygp2kexb 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 yKySXu1+ T0yoBLd+x0cfEGaN1pDnUjYnFAClsjVVJKwzyUSEmZ3TEpc0PO9otJ02TnAuZJMYhPlMyyd0kWgN9HaRtsAe6e737yJxYm1oS2GyIV3HKnpgtw2B3CxGJaFd8dskkxa3KTLLHVeGyEsSx183NLls0fO1WkPkZJQikSDN64x4y+UHf0XG0++r/qKmIeEZJ4w/Nfegrv6+N3o31AMvpCUlP8uKKVdSdGzDPv2zZZ8UcJaNXCcDwU5lrFBkNC3g4BviYUlcEbBCkcI8vubdFUBqZfIN/7vL3fjxylaN8MPP7EVCofdoFy2kwYm9zIgw+tfaHhuUt6h+K6CmaWa4+HM2Ou6hh2YzXsbJlZWySHri2Q5ZwmEk3kuNw6BWW34/VfSQMMCdFR5T2TbQoHbQq7D0ixOVvEz4iEBSOegPmnHi+8YP6T+Br+o+BpVGqkryF2Xe X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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@syzkaller.appspotmail.com ================================================================== 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@googlegroups.com. 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