* omap4: 3.8: IPV6 + PREEMPT_VOLUNTARY + !DEBUG_[SPINLOCK|MUTEXES] = BUG() @ 2013-02-21 9:48 Paolo Pisati 2013-02-22 12:36 ` Russell King - ARM Linux 0 siblings, 1 reply; 5+ messages in thread From: Paolo Pisati @ 2013-02-21 9:48 UTC (permalink / raw) To: linux-arm-kernel I keep getting this BUG() when there's IPV6 traffic in in my lan on a panda board with these configs: -start from a vanilla omap config (make ARCH=arm omap2plus_defconfig) -enable IPV6 and PREEMPT_VOLUNTARY -turn off CONFIG_DEBUG_SPINLOCK CONFIG_DEBUG_MUTEXES CONFIG_DEBUG_LOCK_ALLOC CONFIG_PROVE_LOCKING CONFIG_LOCKDEP CONFIG_TRACE_IRQFLAGS (or apply this patch fragment: http://people.canonical.com/~ppisati/panda_ipv6/config_lock_off.patch) -enable some useful options (like EHCI for my usb disk, etcetc) -finish off the build make ARCH=arm olddefconfig make ARCH=arm zImage -boot the board, wait for some ipv6 traffic: IP6 fe80::213:20ff:fefb:6364.mdns > ff02::fb.mdns: 0 PTR (QM)? _mumble._tcp.local. (36) and enjoy: [Thu Feb 21 10:23:07 2013] BUG: scheduling while atomic: swapper/0/0/0x40000100 [Thu Feb 21 10:23:07 2013] Modules linked in: [Thu Feb 21 10:23:07 2013] [<c001b1c4>] (unwind_backtrace+0x0/0xf0) from [<c0503c5c>] (__schedule_bug+0x48/0x5c) [Thu Feb 21 10:23:07 2013] [<c0503c5c>] (__schedule_bug+0x48/0x5c) from [<c0508608>] (__schedule+0x700/0x740) [Thu Feb 21 10:23:07 2013] [<c0508608>] (__schedule+0x700/0x740) from [<c007007c>] (__cond_resched+0x24/0x34) [Thu Feb 21 10:23:07 2013] [<c007007c>] (__cond_resched+0x24/0x34) from [<c05086dc>] (_cond_resched+0x3c/0x44) [Thu Feb 21 10:23:07 2013] [<c05086dc>] (_cond_resched+0x3c/0x44) from [<c0021f6c>] (do_alignment+0x178/0x78c) [Thu Feb 21 10:23:07 2013] [<c0021f6c>] (do_alignment+0x178/0x78c) from [<c00083e0>] (do_DataAbort+0x34/0x98) [Thu Feb 21 10:23:07 2013] [<c00083e0>] (do_DataAbort+0x34/0x98) from [<c0509a60>] (__dabt_svc+0x40/0x60) [Thu Feb 21 10:23:07 2013] Exception stack(0xc0763d70 to 0xc0763db8) [Thu Feb 21 10:23:07 2013] 3d60: e97e805e e97e806e 2c000000 11000000 [Thu Feb 21 10:23:07 2013] 3d80: ea86bb00 0000002c 00000011 e97e807e c076d2a8 e97e805e e97e806e 0000002c [Thu Feb 21 10:23:07 2013] 3da0: 3d000000 c0763dbc c04b98fc c02a8490 00000113 ffffffff [Thu Feb 21 10:23:07 2013] [<c0509a60>] (__dabt_svc+0x40/0x60) from [<c02a8490>] (__csum_ipv6_magic+0x8/0xc8) here you can find a .config for a 3.8 kernel showing this problem: http://people.canonical.com/~ppisati/panda_ipv6/config and a precompiled zImage: http://people.canonical.com/~ppisati/panda_ipv6/zImage any idea how can i debug this? -- bye, p. ^ permalink raw reply [flat|nested] 5+ messages in thread
* omap4: 3.8: IPV6 + PREEMPT_VOLUNTARY + !DEBUG_[SPINLOCK|MUTEXES] = BUG() 2013-02-21 9:48 omap4: 3.8: IPV6 + PREEMPT_VOLUNTARY + !DEBUG_[SPINLOCK|MUTEXES] = BUG() Paolo Pisati @ 2013-02-22 12:36 ` Russell King - ARM Linux 2013-02-25 14:20 ` Paolo Pisati 0 siblings, 1 reply; 5+ messages in thread From: Russell King - ARM Linux @ 2013-02-22 12:36 UTC (permalink / raw) To: linux-arm-kernel On Thu, Feb 21, 2013 at 10:48:19AM +0100, Paolo Pisati wrote: > any idea how can i debug this? Please try this patch, and report back whether it solves your problem. Thanks. arch/arm/mm/alignment.c | 11 ++++------- 1 files changed, 4 insertions(+), 7 deletions(-) diff --git a/arch/arm/mm/alignment.c b/arch/arm/mm/alignment.c index b820eda..db26e2e 100644 --- a/arch/arm/mm/alignment.c +++ b/arch/arm/mm/alignment.c @@ -749,7 +749,6 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs) unsigned long instr = 0, instrptr; int (*handler)(unsigned long addr, unsigned long instr, struct pt_regs *regs); unsigned int type; - mm_segment_t fs; unsigned int fault; u16 tinstr = 0; int isize = 4; @@ -760,16 +759,15 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs) instrptr = instruction_pointer(regs); - fs = get_fs(); - set_fs(KERNEL_DS); if (thumb_mode(regs)) { - fault = __get_user(tinstr, (u16 *)(instrptr & ~1)); + u16 *ptr = (u16 *)(instrptr & ~1); + fault = probe_kernel_address(ptr, tinstr); if (!fault) { if (cpu_architecture() >= CPU_ARCH_ARMv7 && IS_T32(tinstr)) { /* Thumb-2 32-bit */ u16 tinst2 = 0; - fault = __get_user(tinst2, (u16 *)(instrptr+2)); + fault = probe_kernel_address(ptr + 1, tinst2); instr = (tinstr << 16) | tinst2; thumb2_32b = 1; } else { @@ -778,8 +776,7 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs) } } } else - fault = __get_user(instr, (u32 *)instrptr); - set_fs(fs); + fault = probe_kernel_address(instrptr, instr); if (fault) { type = TYPE_FAULT; ^ permalink raw reply related [flat|nested] 5+ messages in thread
* omap4: 3.8: IPV6 + PREEMPT_VOLUNTARY + !DEBUG_[SPINLOCK|MUTEXES] = BUG() 2013-02-22 12:36 ` Russell King - ARM Linux @ 2013-02-25 14:20 ` Paolo Pisati 2013-02-25 16:14 ` Russell King - ARM Linux 0 siblings, 1 reply; 5+ messages in thread From: Paolo Pisati @ 2013-02-25 14:20 UTC (permalink / raw) To: linux-arm-kernel On Fri, Feb 22, 2013 at 12:36:37PM +0000, Russell King - ARM Linux wrote: > On Thu, Feb 21, 2013 at 10:48:19AM +0100, Paolo Pisati wrote: > > any idea how can i debug this? > > Please try this patch, and report back whether it solves your problem. > Thanks. yes, it solves my problem: any chance we can see it in 3.9 or 3.8.x? -- bye, p. ^ permalink raw reply [flat|nested] 5+ messages in thread
* omap4: 3.8: IPV6 + PREEMPT_VOLUNTARY + !DEBUG_[SPINLOCK|MUTEXES] = BUG() 2013-02-25 14:20 ` Paolo Pisati @ 2013-02-25 16:14 ` Russell King - ARM Linux 2013-02-26 9:40 ` Paolo Pisati 0 siblings, 1 reply; 5+ messages in thread From: Russell King - ARM Linux @ 2013-02-25 16:14 UTC (permalink / raw) To: linux-arm-kernel On Mon, Feb 25, 2013 at 03:20:48PM +0100, Paolo Pisati wrote: > On Fri, Feb 22, 2013 at 12:36:37PM +0000, Russell King - ARM Linux wrote: > > On Thu, Feb 21, 2013 at 10:48:19AM +0100, Paolo Pisati wrote: > > > any idea how can i debug this? > > > > Please try this patch, and report back whether it solves your problem. > > Thanks. > > yes, it solves my problem: any chance we can see it in 3.9 or 3.8.x? I was just looking to send a chase for this, because I'm about to remerge my tree and I wanted this patch committed. Can I use your name and email address in the commit for the Reported-by and Tested-by tags (which will be published in the kernel repository) please? Thanks. ^ permalink raw reply [flat|nested] 5+ messages in thread
* omap4: 3.8: IPV6 + PREEMPT_VOLUNTARY + !DEBUG_[SPINLOCK|MUTEXES] = BUG() 2013-02-25 16:14 ` Russell King - ARM Linux @ 2013-02-26 9:40 ` Paolo Pisati 0 siblings, 0 replies; 5+ messages in thread From: Paolo Pisati @ 2013-02-26 9:40 UTC (permalink / raw) To: linux-arm-kernel On Mon, Feb 25, 2013 at 04:14:01PM +0000, Russell King - ARM Linux wrote: > > I was just looking to send a chase for this, because I'm about to > remerge my tree and I wanted this patch committed. > > Can I use your name and email address in the commit for the Reported-by > and Tested-by tags (which will be published in the kernel repository) > please? Thanks. absolutely: Reported-by: Paolo Pisati <p.pisati@gmail.com> Tested-by: Paolo Pisati <p.pisati@gmail.com> -- bye, p. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-02-26 9:40 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2013-02-21 9:48 omap4: 3.8: IPV6 + PREEMPT_VOLUNTARY + !DEBUG_[SPINLOCK|MUTEXES] = BUG() Paolo Pisati 2013-02-22 12:36 ` Russell King - ARM Linux 2013-02-25 14:20 ` Paolo Pisati 2013-02-25 16:14 ` Russell King - ARM Linux 2013-02-26 9:40 ` Paolo Pisati
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).