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Tue, 29 Oct 2019 01:43:38 -0700 (PDT) MIME-Version: 1.0 References: <0000000000001c46d5059608892f@google.com> In-Reply-To: <0000000000001c46d5059608892f@google.com> From: Dmitry Vyukov Date: Tue, 29 Oct 2019 09:43:27 +0100 Message-ID: Subject: Re: general protection fault in process_one_work To: syzbot , Jiri Pirko Cc: Alexei Starovoitov , bpf , Daniel Borkmann , David Miller , Jakub Kicinski , Martin KaFai Lau , LKML , netdev , Song Liu , syzkaller-bugs , Yonghong Song Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 29, 2019 at 9:38 AM syzbot wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 38207291 bpf: Prepare btf_ctx_access for non raw_tp use c= ase > git tree: bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=3D14173c0f60000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D41648156aa09b= e10 > dashboard link: https://syzkaller.appspot.com/bug?extid=3D9ed8f68ab30761f= 3678e > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit= : > Reported-by: syzbot+9ed8f68ab30761f3678e@syzkaller.appspotmail.com +Ji=C5=99=C3=AD P=C3=ADrko, this seems to be related to netdevsim. > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 9149 Comm: kworker/1:3 Not tainted 5.4.0-rc1+ #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: events nsim_dev_trap_report_work > RIP: 0010:nsim_dev_trap_report_work+0xc4/0xaf0 > drivers/net/netdevsim/dev.c:409 > Code: 89 45 d0 0f 84 8b 07 00 00 49 bc 00 00 00 00 00 fc ff df e8 3e ae e= f > fc 48 8b 45 d0 48 05 68 01 00 00 48 89 45 90 48 c1 e8 03 <42> 80 3c 20 00 > 0f 85 b1 09 00 00 48 8b 45 d0 48 8b 98 68 01 00 00 > RSP: 0018:ffff88806c98fc90 EFLAGS: 00010a06 > RAX: 1bd5a0000000004d RBX: 0000000000000000 RCX: ffffffff84836e22 > RDX: 0000000000000000 RSI: ffffffff84836db2 RDI: 0000000000000001 > RBP: ffff88806c98fd30 R08: ffff88806c9863c0 R09: ffffed100d75f3d9 > R10: ffffed100d75f3d8 R11: ffff88806baf9ec7 R12: dffffc0000000000 > R13: ffff88806baf9ec0 R14: ffff8880a9a13900 R15: ffff8880ae934500 > FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007efdd0c9e000 CR3: 000000009cc1b000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 > worker_thread+0x98/0xe40 kernel/workqueue.c:2415 > kthread+0x361/0x430 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > Modules linked in: > ---[ end trace ba29cd1c27f63d86 ]--- > RIP: 0010:nsim_dev_trap_report_work+0xc4/0xaf0 > drivers/net/netdevsim/dev.c:409 > Code: 89 45 d0 0f 84 8b 07 00 00 49 bc 00 00 00 00 00 fc ff df e8 3e ae e= f > fc 48 8b 45 d0 48 05 68 01 00 00 48 89 45 90 48 c1 e8 03 <42> 80 3c 20 00 > 0f 85 b1 09 00 00 48 8b 45 d0 48 8b 98 68 01 00 00 > RSP: 0018:ffff88806c98fc90 EFLAGS: 00010a06 > RAX: 1bd5a0000000004d RBX: 0000000000000000 RCX: ffffffff84836e22 > RDX: 0000000000000000 RSI: ffffffff84836db2 RDI: 0000000000000001 > RBP: ffff88806c98fd30 R08: ffff88806c9863c0 R09: ffffed100d75f3d9 > R10: ffffed100d75f3d8 R11: ffff88806baf9ec7 R12: dffffc0000000000 > R13: ffff88806baf9ec0 R14: ffff8880a9a13900 R15: ffff8880ae934500 > FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007efdd0c9e000 CR3: 000000009cc1b000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > This bug 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 bug report. 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/msgi= d/syzkaller-bugs/0000000000001c46d5059608892f%40google.com.