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Date: Sat, 18 Feb 2017 00:16:08 +0100 From: Gabriel C <nix.or.die@...il.com> To: Cong Wang <xiyou.wangcong@...il.com> Cc: lkml <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, "David S. Miller" <davem@...emloft.net>, "Peter Zijlstra (Intel)" <peterz@...radead.org> Subject: Re: e1000_netpoll() , BUG: sleeping function called from invalid context On 17.02.2017 23:38, Cong Wang wrote: > On Fri, Feb 17, 2017 at 1:20 PM, Gabriel C <nix.or.die@...il.com> wrote: >> Hi all, >> >> while poking at a different issue I found the following on my logs : >> >> [85362.132770] BUG: sleeping function called from invalid context at >> kernel/irq/manage.c:110 >> [85362.132771] in_atomic(): 1, irqs_disabled(): 1, pid: 1153, name: >> systemd-journal >> [85362.132772] no locks held by systemd-journal/1153. >> [85362.132772] irq event stamp: 60088359 >> [85362.132777] hardirqs last enabled at (60088359): [<ffffffff810d07c2>] >> vprintk_emit+0x432/0x470 >> [85362.132779] hardirqs last disabled at (60088358): [<ffffffff810d03ec>] >> vprintk_emit+0x5c/0x470 >> [85362.132782] softirqs last enabled at (60088258): [<ffffffff810688fd>] >> __do_softirq+0x22d/0x290 >> [85362.132784] softirqs last disabled at (60088233): [<ffffffff81068c0a>] >> irq_exit+0x6a/0xd0 >> [85362.132784] Preemption disabled at: >> [85362.132787] [<ffffffff815203de>] write_msg+0x4e/0xf0 >> [85362.132790] CPU: 0 PID: 1153 Comm: systemd-journal Tainted: G I >> 4.10.0-rc8-debug-00001-ga1015e374d94-dirty #5 >> [85362.132791] Hardware name: FUJITSU PRIMERGY >> TX200 S5 /D2709, BIOS 6.00 Rev. 1.14.2709 >> 02/04/2013 >> [85362.132792] Call Trace: >> [85362.132796] dump_stack+0x86/0xc1 >> [85362.132799] ___might_sleep+0x213/0x230 >> [85362.132801] __might_sleep+0x6b/0x80 >> [85362.132803] synchronize_irq+0x33/0x90 >> [85362.132805] ? __irq_put_desc_unlock+0x19/0x40 >> [85362.132807] ? __disable_irq_nosync+0x4e/0x60 >> [85362.132808] disable_irq+0x17/0x20 > > > Hmm, your kernel base version is 4.10.0-rc8 but the symbols here > look like prior to my commit, because with my commit here should > be disable_hardirq() calling synchronize_hardirq(). > > Did you revert it or make any local changes? The kernel is -rc8 with reverted d966564fcdc19e13eb6ba1fbe6b8101070339c3d + http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=202461e2f3c15dbfb05825d29ace0d20cdf55fa4 + an debug patch from Thomas to find these goldfish issues. ( http://ftp.frugalware.org/pub/other/people/crazy/kernel/t/goldfish-debug.patch ) No other changes.. > > >> [85362.132810] e1000_netpoll+0x3d/0x110 >> [85362.132813] netpoll_poll_dev+0xa0/0x170 >> [85362.132814] netpoll_send_skb_on_dev+0x1ab/0x2b0 >> [85362.132816] netpoll_send_udp+0x417/0x450 >> [85362.132817] write_msg+0xdb/0xf0 >> [85362.132819] console_unlock+0x2e5/0x430 >> [85362.132821] ? __down_trylock_console_sem+0x41/0x60 >> [85362.132822] vprintk_emit+0x456/0x470 >> [85362.132825] printk_emit+0x2e/0x36 >> [85362.132827] ? simple_strtoull+0x2c/0x50 >> [85362.132829] devkmsg_write+0x115/0x160 >> [85362.132831] do_iter_readv_writev+0xd8/0x100 >> [85362.132833] do_readv_writev+0xdf/0x220 >> [85362.132835] ? __might_fault+0x37/0x90 >> [85362.132838] ? entry_SYSCALL_64_fastpath+0x5/0xc2 >> [85362.132839] vfs_writev+0x3a/0x50 >> [85362.132841] do_writev+0x4c/0xd0 >> [85362.132842] SyS_writev+0xb/0x10 >> [85362.132843] entry_SYSCALL_64_fastpath+0x1f/0xc2 >> [85362.132845] RIP: 0033:0x7fc6d305c46d >> [85362.132846] RSP: 002b:00007ffca94161e0 EFLAGS: 00000293 ORIG_RAX: >> 0000000000000014 >> [85362.132847] RAX: ffffffffffffffda RBX: ffffffff813afad3 RCX: >> 00007fc6d305c46d >> [85362.132848] RDX: 0000000000000005 RSI: 00007ffca94162f0 RDI: >> 0000000000000006 >> [85362.132849] RBP: ffffc9000d4c3f88 R08: 0000000000000000 R09: >> 0000000000000008 >> [85362.132850] R10: 0000000000000069 R11: 0000000000000293 R12: >> 00007ffca94162f0 >> [85362.132851] R13: 000055768b19c920 R14: 00007ffca9416330 R15: >> 00007ffca94163c0 >> [85362.132853] ? __this_cpu_preempt_check+0x13/0x20 >> >> >> Seems to be introduced by : >> >> commit 311191297125156319be8f86d546ea1c569f7e95 >> Author: WANG Cong <xiyou.wangcong@...il.com> >> Date: Sat Dec 10 14:22:42 2016 -0800 >> >> e1000: use disable_hardirq() for e1000_netpoll() >> >> ... >> >> The used config can be found there: >> >> http://ftp.frugalware.org/pub/other/people/crazy/kernel/t/config-rcx >> >> >> Regards, >> >> Gabriel C
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