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Date: Thu, 10 Apr 2014 00:44:43 +0800 From: Jet Chen <jet.chen@...el.com> To: Fengguang Wu <fengguang.wu@...el.com>, Alessandro Rubini <rubini@...dd.com> CC: gregkh@...uxfoundation.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [FMC] BUG: scheduling while atomic: swapper/1/0x10000002 On 04/09/2014 01:28 PM, Fengguang Wu wrote: > On Wed, Apr 09, 2014 at 07:08:43AM +0200, Alessandro Rubini wrote: >> Hello. >> Thank you for the report. >> >> I'm at a conference and I fear I won't be able to test myself in the >> next days, but I think this is already fixed (it is part of >> the "misc_register" call path, so it's the same problem). >> >> The fix is commit v3.11-rc2-11-g783c2fb >> >> 783c2fb FMC: fix locking in sample chardev driver >> >> This commit, however, is not part of v3.11 and I think this is why you >> are finding the problem in the v3.10..v3.11 interval. > > Alessandro, you are right. There are no more "scheduling while > atomic" bugs in v3.12 and v3.13. > > Our bisect log shows > > git bisect bad 38dbfb59d1175ef458d006556061adeaa8751b72 # 10:03 0- 345 Linus 3.14-rc1 > > However that happen to be caused by an independent "scheduling while > atomic" bug: Alessandro, Fengguang & I confirmed that this below dmesg is also caused by over locking in fc_probe(). Not a new introduced bug. > > [ 20.038125] Fixing recursive fault but reboot is needed! > [ 20.038125] BUG: scheduling while atomic: kworker/0:1H/77/0x00000005 > [ 20.038125] INFO: lockdep is turned off. > [ 20.038125] irq event stamp: 758 > [ 20.038125] hardirqs last enabled at (757): [<c1c31683>] _raw_spin_unlock_irq+0x22/0x30 > [ 20.038125] hardirqs last disabled at (758): [<c1c31523>] _raw_spin_lock_irq+0x14/0x73 > [ 20.038125] softirqs last enabled at (302): [<c1032d4d>] __do_softirq+0x186/0x1d2 > [ 20.038125] softirqs last disabled at (295): [<c1002f99>] do_softirq_own_stack+0x2f/0x35 > [ 20.038125] CPU: 0 PID: 77 Comm: kworker/0:1H Tainted: G D W 3.14.0-rc1 #1 > [ 20.038125] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 > [ 20.038125] c0420610 c0420610 c0449a38 c1c1f562 c0449a54 c1c1b59c c1f91661 c0420938 > [ 20.038125] 0000004d 00000005 c0420610 c0449acc c1c2e4e2 c105fff8 01449a7c 000004af > [ 20.038125] c0420610 0000002c 00000001 c0449a7c c0420610 c0449ab4 c106001c 00000000 > [ 20.038125] Call Trace: > [ 20.038125] [<c1c1f562>] dump_stack+0x16/0x18 > [ 20.038125] [<c1c1b59c>] __schedule_bug+0x5d/0x6f > [ 20.038125] [<c1c2e4e2>] __schedule+0x45/0x55f > [ 20.038125] [<c105fff8>] ? vprintk_emit+0x367/0x3a4 > [ 20.038125] [<c106001c>] ? vprintk_emit+0x38b/0x3a4 > [ 20.038125] [<c105876b>] ? trace_hardirqs_off+0xb/0xd > [ 20.038125] [<c1c1c185>] ? printk+0x38/0x3a > [ 20.038125] [<c1c2ea59>] schedule+0x5d/0x5f > [ 20.038125] [<c10314b8>] do_exit+0xcc/0x75d > [ 20.038125] [<c1060e7b>] ? kmsg_dump+0x184/0x191 > [ 20.038125] [<c1060d13>] ? kmsg_dump+0x1c/0x191 > [ 20.038125] [<c1003d54>] oops_end+0x7e/0x83 > [ 20.038125] [<c1c1ae82>] no_context+0x1ba/0x1c2 > [ 20.038125] [<c1c1afc1>] __bad_area_nosemaphore+0x137/0x13f > [ 20.038125] [<c1c1a82d>] ? pte_offset_kernel+0x13/0x2a > [ 20.038125] [<c1c1aa5f>] ? spurious_fault+0x75/0xd5 > [ 20.038125] [<c1c1afdb>] bad_area_nosemaphore+0x12/0x14 > > Thanks, > Fengguang > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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