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Message-ID: <CACqU3MWPEBe1yFA=zBJos++VQhCnMSbEmnRP9X7O-DyzUKWtnw@mail.gmail.com> Date: Thu, 25 Aug 2011 02:05:20 -0400 From: Arnaud Lacombe <lacombar@...il.com> To: Ingo Molnar <mingo@...e.hu> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org>, Andy Lutomirski <luto@....edu> Subject: Re: [GIT PULL] x86/vdso changes for v3.1 Hi, On Thu, Aug 25, 2011 at 1:58 AM, Arnaud Lacombe <lacombar@...il.com> wrote: > Hi, > > On Fri, Jul 22, 2011 at 11:42 AM, Ingo Molnar <mingo@...e.hu> wrote: >> Linus, >> >> Please pull the latest x86-vdso-for-linus git tree from: >> >> git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-vdso-for-linus >> >> >> out-of-topic modifications in x86-vdso-for-linus: >> ------------------------------------------------- >> arch/ia64/Kconfig # ae7bd11: clocksource: Change __ARCH_HAS_CL >> arch/ia64/include/asm/clocksource.h# ae7bd11: clocksource: Change __ARCH_HAS_CL >> # 574c44f: ia64: Replace clocksource.fsys_mm >> arch/ia64/kernel/cyclone.c # 574c44f: ia64: Replace clocksource.fsys_mm >> arch/ia64/kernel/time.c # 574c44f: ia64: Replace clocksource.fsys_mm >> arch/ia64/sn/kernel/sn2/timer.c # 574c44f: ia64: Replace clocksource.fsys_mm >> drivers/char/hpet.c # 574c44f: ia64: Replace clocksource.fsys_mm >> include/linux/clocksource.h # ae7bd11: clocksource: Change __ARCH_HAS_CL >> # 574c44f: ia64: Replace clocksource.fsys_mm >> # 433bd80: clocksource: Replace vread with g >> include/linux/seccomp.h # 5cec93c: x86-64: Emulate legacy vsyscalls >> >> Thanks, >> >> Ingo >> >> ------------------> >> Andy Lutomirski (17): >> x86-64: Fix alignment of jiffies variable >> x86-64: Document some of entry_64.S >> x86-64: Give vvars their own page >> x86-64: Remove kernel.vsyscall64 sysctl >> x86-64: Map the HPET NX >> x86-64: Remove vsyscall number 3 (venosys) >> x86-64: Fill unused parts of the vsyscall page with 0xcc >> x86-64: Emulate legacy vsyscalls >> x86-64: Improve vsyscall emulation CS and RIP handling >> x86: Make alternative instruction pointers relative > > Bisecting this BUG: > > CPU: Intel QEMU Virtual CPU version 0.13.0 stepping 03 > BUG: unable to handle kernel paging request at 8277e54c > IP: [<c13765fb>] apply_alternatives+0xc3/0x18a > *pde = 00000000 > Oops: 0000 [#1] DEBUG_PAGEALLOC > > Pid: 0, comm: swapper Not tainted 3.1.0-rc3 #20 Bochs Bochs > EIP: 0060:[<c13765fb>] EFLAGS: 00000286 CPU: 0 > EIP is at apply_alternatives+0xc3/0x18a > EAX: ffffffff EBX: c13bee40 ECX: 00000005 EDX: 8277e54c > ESI: 8277e54c EDI: c1349e9e EBP: c1349fa8 ESP: c1349e70 > DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 > Process swapper (pid: 0, ti=c1348000 task=c134e340 task.ti=c1348000) > Stack: > 00000002 c135d7c0 c11418a0 00000db8 c1349e9e 82655b12 00000005 8277e54c > c13bf6ec c1349e05 05000086 f6890046 00f69000 c1349eb0 00000086 00000000 > 00000046 c1349ec0 00000046 00000000 c1349edc c101f29c 00000dc5 00000000 > Call Trace: > [<c11418a0>] ? serial8250_start_tx+0xe0/0xe0 > [<c101f29c>] ? console_unlock+0x10c/0x150 > [<c10039c3>] ? do_IRQ+0x43/0xa0 > [<c12975a9>] ? common_interrupt+0x29/0x30 > [<c1294d59>] ? printk+0x18/0x1f > [<c139070b>] ? print_cpu_info+0x93/0x11f > [<c13766d9>] alternative_instructions+0x17/0x32 > [<c1377552>] check_bugs+0x91/0x93 > [<c13716b6>] start_kernel+0x289/0x294 > [<c13711b7>] ? loglevel+0x1a/0x1a > [<c13710b3>] i386_start_kernel+0xb3/0xbb > Code: ec fe ff ff 8d 0c 0b 89 8d dc fe ff ff 8d 54 13 04 8b bd d8 fe > ff ff 89 95 e4 fe ff ff 89 b5 e0 fe ff ff 8b 8d e0 fe ff ff 89 d6 <f3> > a4 80 bd f6 fe ff ff e8 75 17 80 bd ec fe ff ff 05 75 0e 89 > EIP: [<c13765fb>] apply_alternatives+0xc3/0x18a SS:ESP 0068:c1349e70 > CR2: 000000008277e54c > ---[ end trace 4eaa2a86a8e2da22 ]--- > Kernel panic - not syncing: Attempted to kill the idle task! > Pid: 0, comm: swapper Tainted: G D 3.1.0-rc3 #20 > Call Trace: > [<c1294d59>] ? printk+0x18/0x1f > [<c1294c4a>] panic+0x57/0x14e > [<c10221a1>] do_exit+0x201/0x290 > [<c1004ace>] oops_end+0x6e/0x90 > [<c1294d59>] ? printk+0x18/0x1f > [<c1013efc>] no_context+0xbc/0x150 > [<c1013fc0>] __bad_area_nosemaphore+0x30/0x170 > [<c1014450>] ? vmalloc_sync_all+0xf0/0xf0 > [<c1014112>] bad_area_nosemaphore+0x12/0x20 > [<c101466f>] do_page_fault+0x21f/0x360 > [<c105c070>] ? get_page_from_freelist+0x110/0x300 > [<c1023b24>] ? irq_exit+0x54/0x90 > [<c10039c3>] ? do_IRQ+0x43/0xa0 > [<c1140e31>] ? wait_for_xmitr+0x31/0x90 > [<c1014450>] ? vmalloc_sync_all+0xf0/0xf0 > [<c1296df8>] error_code+0x58/0x60 > [<c1014450>] ? vmalloc_sync_all+0xf0/0xf0 > [<c13765fb>] ? apply_alternatives+0xc3/0x18a > [<c11418a0>] ? serial8250_start_tx+0xe0/0xe0 > [<c101f29c>] ? console_unlock+0x10c/0x150 > [<c10039c3>] ? do_IRQ+0x43/0xa0 > [<c12975a9>] ? common_interrupt+0x29/0x30 > [<c1294d59>] ? printk+0x18/0x1f > [<c139070b>] ? print_cpu_info+0x93/0x11f > [<c13766d9>] alternative_instructions+0x17/0x32 > [<c1377552>] check_bugs+0x91/0x93 > [<c13716b6>] start_kernel+0x289/0x294 > [<c13711b7>] ? loglevel+0x1a/0x1a > [<c13710b3>] i386_start_kernel+0xb3/0xbb > QEMU: Terminated > > lead me to that commit: > > commit 59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93 > Author: Andy Lutomirski <luto@....edu> > Date: Wed Jul 13 09:24:10 2011 -0400 > > x86: Make alternative instruction pointers relative > > This save a few bytes on x86-64 and means that future patches can > apply alternatives to unrelocated code. > > Signed-off-by: Andy Lutomirski <luto@....edu> > Link: http://lkml.kernel.org/r/ff64a6b9a1a3860ca4a7b8b6dc7b4754f9491cd7.1310563276.git.luto@mit.edu > Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com> > > > Here is the bisection log: > > > % git bisect log > git bisect start > # bad: [3ef706459b940b49e37a62c8ec720728c7260b49] acpi/acpi_drivers.h: > fix warnings when ACPI_DOCK is not enabled > this first step is an un-merged local change from next-20110824. > > git bisect bad 3ef706459b940b49e37a62c8ec720728c7260b49 > # bad: [fcb8ce5cfe30ca9ca5c9a79cdfe26d1993e65e0c] Linux 3.1-rc3 > git bisect bad fcb8ce5cfe30ca9ca5c9a79cdfe26d1993e65e0c > # good: [02f8c6aee8df3cdc935e9bdd4f2d020306035dbe] Linux 3.0 > git bisect good 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe > # bad: [d272281c390eb6c3f1e70ed0337c9e619d99cd9c] [SCSI] fcoe: cleanup > cpu selection for incoming requests > git bisect bad d272281c390eb6c3f1e70ed0337c9e619d99cd9c > # good: [f9035cd498486d5a82ad8ae9bcfdb91b3e57ec9d] Merge branch > 'for-davem' of ssh://master.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 > git bisect good f9035cd498486d5a82ad8ae9bcfdb91b3e57ec9d > # bad: [c61264f98c1a974ee6f545f61a4ab33b141d6bda] Merge branch > 'upstream/xen-tracing2' of > git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen > git bisect bad c61264f98c1a974ee6f545f61a4ab33b141d6bda > # bad: [9d1c02135516866cbbb2f80e20cfb65c63a3ce40] Merge branch > 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs > git bisect bad 9d1c02135516866cbbb2f80e20cfb65c63a3ce40 > # good: [112ec469663e09ffc815761254b52f3ca787ce83] Merge branch > 'timers-core-for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip > git bisect good 112ec469663e09ffc815761254b52f3ca787ce83 > # good: [5a9a43646cf709312d71eca71cef90ad802f28f9] vfs: use ERR_CAST > for err-ptr tossing in lookup_instantiate_filp > git bisect good 5a9a43646cf709312d71eca71cef90ad802f28f9 > # good: [805120795947008612ef64618bba8a6aa30cf88b] Merge branch > 'x86-signal-for-linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip > git bisect good 805120795947008612ef64618bba8a6aa30cf88b > # bad: [e660a828f017991468ce322742586e8ebb047ae6] 9p: clean up packet dump code > git bisect bad e660a828f017991468ce322742586e8ebb047ae6 > # bad: [8c400f6ce068366bc3517f1036bb99169cfec9cd] x86, vdso: Drop now > wrong comment > git bisect bad 8c400f6ce068366bc3517f1036bb99169cfec9cd > # good: [5cec93c216db77c45f7ce970d46283bcb1933884] x86-64: Emulate > legacy vsyscalls > git bisect good 5cec93c216db77c45f7ce970d46283bcb1933884 > # bad: [7f79ad15f33cf4968cafb0e3d2beba427de01d3a] x86-64: Add > --no-undefined to vDSO build > git bisect bad 7f79ad15f33cf4968cafb0e3d2beba427de01d3a > # bad: [59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93] x86: Make > alternative instruction pointers relative > git bisect bad 59e97e4d6fbcd5b74a94cb48bcbfc6f8478a5e93 > # good: [c9712944b2a12373cb6ff8059afcfb7e826a6c54] x86-64: Improve > vsyscall emulation CS and RIP handling > git bisect good c9712944b2a12373cb6ff8059afcfb7e826a6c54 > > I'm trying a kernel with 59e97e4d6fb reverted on top of -rc3 to check. > Revert triggered a single conflict in `arch/x86/kernel/alternative.c'. > After the revert, -rc3 boots successfully: # uname -a Linux OpenWrt 3.1.0-rc3+ #21 Thu Aug 25 01:57:26 EDT 2011 i686 GNU/Linux That's one bug for the night, now 'got to catch a mouse hiding in my kitchen. - Arnaud -- 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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