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s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=jHeA6QTWcn7D3dgO+zTnrL0IC8nyerOMBAJ1Lhr8b7g=; b=qoAknkTi/w46MAPf/LPjcfkNgvJ3LpROuYssmLb1OJPQVudTbknEAjaSVlPslS03RY GEzvjorbb0gO5GVjXcFHs14gQmRnC5HCH6t/05hOOxImP9hNuEOwizg2UQVIBBAjxZA5 gVB2qblO2Yx2u2AbbDRv1m4N1TEJdsf9V3Z+q4bbhUxzcRt5liBgkgLhG3U3OR5ANJe/ X0x1Y9h6Yi3parSQpha3w/svRao4elEslG+E8e3YuLWpFVovT1Galb1bK3vPoFQGUW5V lf2AXHxXfCAbcFm2BYZ21FpkdKtOXFU+WRbYDbQH6h13eoqvqqjDDhBAiBl0M48zOtOx dRkA== X-Gm-Message-State: AOAM530nNbVo7CxpQkttsbl0xuSe6TPEaH0ZNfBcTRR79TNbo9yMzDVG DcjysLjjRbdVu/7NB5WPLCG8kloBaXFI6gDIr8hJ4A== X-Google-Smtp-Source: ABdhPJzwKLN5P2q2/qVy3FdobO1ML+WHP2ivraiBmoQqc1rKhBql0O2Lry8got3eyGC6p0brIwjpCcEpivwP2arHX9A= X-Received: by 2002:a05:620a:2095:: with SMTP id e21mr8476293qka.265.1616147699834; Fri, 19 Mar 2021 02:54:59 -0700 (PDT) MIME-Version: 1.0 References: <0000000000004f14c105bde08f75@google.com> In-Reply-To: <0000000000004f14c105bde08f75@google.com> From: Dmitry Vyukov Date: Fri, 19 Mar 2021 10:54:48 +0100 Message-ID: Subject: Re: [syzbot] upstream boot error: WARNING in __context_tracking_enter To: syzbot , Mark Rutland , Russell King - ARM Linux , Arnd Bergmann , Linux ARM Cc: Alexandre Chartre , LKML , Masami Hiramatsu , Peter Zijlstra , syzkaller-bugs , Thomas Gleixner X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210319_095503_184683_B8C1740A X-CRM114-Status: GOOD ( 23.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org .On Fri, Mar 19, 2021 at 10:44 AM syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 8b12a62a Merge tag 'drm-fixes-2021-03-19' of git://anongit.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17e815aed00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cfeed364fc353c32 > dashboard link: https://syzkaller.appspot.com/bug?extid=f09a12b2c77bfbbf51bd > userspace arch: arm > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+f09a12b2c77bfbbf51bd@syzkaller.appspotmail.com +Mark, arm It did not get far with CONFIG_CONTEXT_TRACKING_FORCE (kernel doesn't boot). > Run /sbin/init as init process > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 1 at include/linux/seqlock.h:271 __seqprop_assert include/linux/seqlock.h:271 [inline] > WARNING: CPU: 0 PID: 1 at include/linux/seqlock.h:271 __seqprop_assert.constprop.0+0xf0/0x11c include/linux/seqlock.h:269 > Modules linked in: > Kernel panic - not syncing: panic_on_warn set ... > CPU: 0 PID: 1 Comm: init Not tainted 5.12.0-rc3-syzkaller #0 > Hardware name: ARM-Versatile Express > Backtrace: > [<81804310>] (dump_backtrace) from [<81804584>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) > r7:00000080 r6:60000193 r5:00000000 r4:82b58444 > [<8180456c>] (show_stack) from [<8180bc58>] (__dump_stack lib/dump_stack.c:79 [inline]) > [<8180456c>] (show_stack) from [<8180bc58>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) > [<8180bba0>] (dump_stack) from [<81805118>] (panic+0x130/0x378 kernel/panic.c:231) > r7:81f487d4 r6:82a390e4 r5:00000000 r4:82c6b0d8 > [<81804fe8>] (panic) from [<802447b4>] (__warn+0xb0/0x164 kernel/panic.c:605) > r3:82a2248c r2:00000000 r1:5b71e000 r0:81f487d4 > r7:0000010f > [<80244704>] (__warn) from [<818053c8>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628) > r7:8028c4b4 r6:0000010f r5:81f40c30 r4:00000000 > [<81805364>] (warn_slowpath_fmt) from [<8028c4b4>] (__seqprop_assert include/linux/seqlock.h:271 [inline]) > [<81805364>] (warn_slowpath_fmt) from [<8028c4b4>] (__seqprop_assert.constprop.0+0xf0/0x11c include/linux/seqlock.h:269) > r8:00000000 r7:82a22498 r6:828ac940 r5:8181fbb0 r4:00000001 > [<8028c3c4>] (__seqprop_assert.constprop.0) from [<8028ea54>] (vtime_user_enter+0x1c/0x90 kernel/sched/cputime.c:709) > r5:8181fbb0 r4:834f0000 > [<8028ea38>] (vtime_user_enter) from [<8181fbb0>] (__context_tracking_enter+0x148/0x334 kernel/context_tracking.c:82) > r7:82a22498 r6:828ac940 r5:ffffe000 r4:00000001 > [<8181fa68>] (__context_tracking_enter) from [<80417170>] (context_tracking_enter kernel/context_tracking.c:122 [inline]) > [<8181fa68>] (__context_tracking_enter) from [<80417170>] (context_tracking_enter+0x54/0x84 kernel/context_tracking.c:106) > r7:00000000 r6:00000000 r5:60000193 r4:00000001 > [<8041711c>] (context_tracking_enter) from [<804171bc>] (user_enter include/linux/context_tracking.h:28 [inline]) > [<8041711c>] (context_tracking_enter) from [<804171bc>] (context_tracking_user_enter+0x1c/0x20 kernel/context_tracking.c:130) > r5:81820218 r4:00000000 > [<804171a0>] (context_tracking_user_enter) from [<802000d4>] (no_work_pending+0x8/0x38) > Exception stack(0x834dffb0 to 0x834dfff8) > ffa0: 00000000 00000000 00000000 00000000 > ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > ffe0: 00000000 7ec68ef0 00000000 76ee5a00 00000010 00000000 > Rebooting in 86400 seconds.. > > > --- > 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. > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000004f14c105bde08f75%40google.com. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel