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charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 93717cde744f Add linux-next specific files for 20210830 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15ef5ba9300000 kernel config: https://syzkaller.appspot.com/x/.config?x=c643ef5289990dd1 dashboard link: https://syzkaller.appspot.com/bug?extid=ac4f41effb32ce6491c0 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17bde2f5300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15d11625300000 Bisection is inconclusive: the first bad commit could be any of: 0ee50b47532a namei: change filename_parentat() calling conventions 584d3226d665 namei: make do_mkdirat() take struct filename bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=129f0125300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ac4f41effb32ce6491c0@syzkaller.appspotmail.com INFO: task syz-executor702:6954 can't die for more than 143 seconds. task:syz-executor702 state:R running task stack:24344 pid: 6954 ppid: 6540 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6302 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0000:0xffffc900034bf728 RSP: 34bf748:0000000000000000 EFLAGS: 00000046 ORIG_RAX: ffffffff89400c02 ================================================================== BUG: KASAN: stack-out-of-bounds in __show_regs.cold+0x2b/0x481 arch/x86/kernel/process_64.c:81 Read of size 8 at addr ffffc900034bf6c0 by task khungtaskd/27 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-next-20210830-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xf/0x309 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 __show_regs.cold+0x2b/0x481 arch/x86/kernel/process_64.c:81 show_trace_log_lvl+0x25b/0x2ba arch/x86/kernel/dumpstack.c:298 sched_show_task kernel/sched/core.c:8560 [inline] sched_show_task+0x433/0x5b0 kernel/sched/core.c:8534 check_killed_task kernel/hung_task.c:184 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:242 [inline] watchdog.cold+0x74/0x1de kernel/hung_task.c:339 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffffc900034bf580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900034bf600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900034bf680: 00 00 00 f1 f1 f1 f1 00 00 f3 f3 00 00 00 00 00 ^ ffffc900034bf700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc900034bf780: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 f2 ================================================================== --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches