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Fri, 21 Apr 2023 07:33:50 -0700 (PDT) Date: Fri, 21 Apr 2023 07:33:50 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b9915d05f9d98bdd@google.com> Subject: [syzbot] [ext4?] [mm?] KCSAN: data-race in strscpy / strscpy (3) From: syzbot To: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, nathan@kernel.org, ndesaulniers@google.com, syzkaller-bugs@googlegroups.com, trix@redhat.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: CD88B2001B X-Stat-Signature: uog1ftp7nu7g69g1x4jf9crj9s87t9dj X-HE-Tag: 1682087631-597641 X-HE-Meta: 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 XzA4L2bm 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 1HnZTGfA gTEdtT+2XpMD+FvGEI4asR5v+/58mLvqA14vKQibBFaP8cUaJZaqjuMOyZc/DmiBEfzrGMYz7bmLhgzHOmPkwODu21rGEYhMlqDbFSLRfGwYXQ8DaRkzOHbDr/BLvFa39an2rtJdj8fg5rr4Tny8/0lUW02BwmuhsTG/1WwxYS840Ojzlsc8clYejRobvmDvLmrzIaVMjJRYvBqxLXgu447HTRGiW+HErmgCx7vJpvuzSUSj0E4wbiOkpFOdXY0wwp8jZ5FIiwr/T0qjEEP/ALWO84DKEA/FXa6BjoEGD1izd8W2xJWLsHoFDPjbS4wg 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: Hello, syzbot found the following issue on: HEAD commit: 76f598ba7d8e Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=133bfbedc80000 kernel config: https://syzkaller.appspot.com/x/.config?x=9c5d44636e91081b dashboard link: https://syzkaller.appspot.com/bug?extid=c2de99a72baaa06d31f3 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a3654f5f77b9/disk-76f598ba.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/abfb4aaa5772/vmlinux-76f598ba.xz kernel image: https://storage.googleapis.com/syzbot-assets/789fb5546551/bzImage-76f598ba.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c2de99a72baaa06d31f3@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in strscpy / strscpy write to 0xffff88812ed8b730 of 8 bytes by task 16157 on cpu 1: strscpy+0xa9/0x170 lib/string.c:165 strscpy_pad+0x27/0x80 lib/string_helpers.c:835 __set_task_comm+0x46/0x140 fs/exec.c:1232 set_task_comm include/linux/sched.h:1984 [inline] __kthread_create_on_node+0x2b2/0x320 kernel/kthread.c:474 kthread_create_on_node+0x8a/0xb0 kernel/kthread.c:512 ext4_run_lazyinit_thread fs/ext4/super.c:3848 [inline] ext4_register_li_request+0x407/0x650 fs/ext4/super.c:3983 __ext4_fill_super fs/ext4/super.c:5480 [inline] ext4_fill_super+0x3f4a/0x43f0 fs/ext4/super.c:5637 get_tree_bdev+0x2b1/0x3a0 fs/super.c:1303 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5668 vfs_get_tree+0x51/0x190 fs/super.c:1510 do_new_mount+0x200/0x650 fs/namespace.c:3042 path_mount+0x498/0xb40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3571 __x64_sys_mount+0x67/0x80 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff88812ed8b733 of 1 bytes by task 16161 on cpu 0: strscpy+0xde/0x170 lib/string.c:174 ____bpf_get_current_comm kernel/bpf/helpers.c:260 [inline] bpf_get_current_comm+0x45/0x70 kernel/bpf/helpers.c:252 ___bpf_prog_run+0x281/0x3050 kernel/bpf/core.c:1822 __bpf_prog_run32+0x74/0xa0 kernel/bpf/core.c:2043 bpf_dispatcher_nop_func include/linux/bpf.h:1124 [inline] __bpf_prog_run include/linux/filter.h:601 [inline] bpf_prog_run include/linux/filter.h:608 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2263 [inline] bpf_trace_run4+0x9f/0x140 kernel/trace/bpf_trace.c:2304 __traceiter_sched_switch+0x3a/0x50 include/trace/events/sched.h:222 trace_sched_switch include/trace/events/sched.h:222 [inline] __schedule+0x7e7/0x8e0 kernel/sched/core.c:6622 schedule+0x51/0x80 kernel/sched/core.c:6701 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:6760 kthread+0x11c/0x1e0 kernel/kthread.c:369 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 value changed: 0x72 -> 0x34 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 16161 Comm: ext4lazyinit Not tainted 6.3.0-rc5-syzkaller-00022-g76f598ba7d8e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 ================================================================== --- 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.