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Message-ID: <alpine.LFD.2.00.1004272053130.2951@localhost.localdomain> Date: Tue, 27 Apr 2010 20:56:05 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Xianghua Xiao <xiaoxianghua@...il.com> cc: LKML <linux-kernel@...r.kernel.org>, John Stultz <johnstul@...ibm.com> Subject: Re: 2.6.33.3-rt16 Oops caused by umount On Tue, 27 Apr 2010, Xianghua Xiao wrote: cc'ed John > 2.6.33.2-rt13 worked fine, however on 2.6.33.3-rt16, when I do reboot, it oops: > > # reboot > # Oops: Kernel access of bad area, sig: 11 [#1] > PREEMPT 83xx Sys > Modules linked in: > NIP: c00efc68 LR: c00efc38 CTR: 00000000 > REGS: ce6e3dc0 TRAP: 0300 Not tainted (2.6.33.3-rt16) > MSR: 00009032 <EE,ME,IR,DR> CR: 24000448 XER: 00000000 > DAR: 00000038, DSISR: 20000000 > TASK = cd89ccc0[1613] 'umount' THREAD: ce6e2000 > GPR00: 00000000 ce6e3e70 cd89ccc0 ce6e3ddc 22222222 00000000 ce6e3e24 ce6e3e04 > GPR08: 00008000 00000010 cdfa2130 cdfa26e0 44000442 100bbc1c 0fffd000 ffffffff > GPR16: 00000001 00000000 007fff00 00000000 00000000 00000001 ce6e3eb8 00000021 > GPR24: 00000060 00000000 00000000 ceb94c40 00000000 ceb94cc0 c065781c ce6e3e70 > NIP [c00efc68] fs_may_remount_ro+0x6c/0xd8 > LR [c00efc38] fs_may_remount_ro+0x3c/0xd8 > Call Trace: > [ce6e3e70] [c00efc38] fs_may_remount_ro+0x3c/0xd8 (unreliable) > [ce6e3e90] [c00f1198] do_remount_sb+0x11c/0x164 > [ce6e3eb0] [c0113a3c] do_mount+0x538/0x86c > [ce6e3f10] [c0113e30] sys_mount+0xc0/0x120 > [ce6e3f40] [c00178d8] ret_from_syscall+0x0/0x38 > --- Exception: c01 at 0xfe5f8c4 > LR = 0x10051b88 > Instruction dump: > 38000000 817d00c0 3bbd00c0 60088000 814b0000 2f8a0000 419e0008 7c00522c > 7f8be800 419e004c 812b000c 81290040 <80090028> 2f800000 419e0028 a009006e > ---[ end trace 17c711f9d369c3a3 ]--- > ------------[ cut here ]------------ > Kernel BUG at c045eeac [verbose debug info unavailable] > Oops: Exception in kernel mode, sig: 5 [#2] > PREEMPT 83xx Sys > Modules linked in: > NIP: c045eeac LR: c045ee84 CTR: 00000000 > REGS: ce6e3a80 TRAP: 0700 Tainted: G D (2.6.33.3-rt16) > MSR: 00021032 <ME,CE,IR,DR> CR: 44004428 XER: 00000000 > TASK = cd89ccc0[1613] 'umount' THREAD: ce6e2000 > GPR00: 00000001 ce6e3b30 cd89ccc0 c068f6b4 c045fc68 00000000 ce6e3b84 ce6e3b64 > GPR08: ce6e3b5c c0690000 cd89ccc0 ce6e3b30 24004422 100bbc1c 0fffd000 ffffffff > GPR16: 00000001 00000000 007fff00 00000000 00000000 c0657824 ce6e3eb8 ce6e3b3c > GPR24: cf028ea0 cec84d1c c065781c cec86a60 00009032 c065781c c065781c ce6e3b30 > NIP [c045eeac] rt_spin_lock_slowlock+0xa8/0x394 > LR [c045ee84] rt_spin_lock_slowlock+0x80/0x394 > Call Trace: > [ce6e3b30] [c045ee84] rt_spin_lock_slowlock+0x80/0x394 (unreliable) > [ce6e3bc0] [c045fc68] rt_spin_lock+0x58/0x90 > [ce6e3bd0] [c00efbbc] file_sb_list_del+0x48/0x88 > [ce6e3bf0] [c00f03ac] __fput+0x168/0x274 > [ce6e3c20] [c00f04f8] fput+0x40/0x58 > [ce6e3c30] [c00d3f74] remove_vma+0x78/0xd8 > [ce6e3c50] [c00d4150] exit_mmap+0x17c/0x1e4 > [ce6e3cc0] [c00318c0] mmput+0x6c/0x144 > [ce6e3ce0] [c003712c] exit_mm+0x15c/0x190 > [ce6e3d10] [c00391e8] do_exit+0xf0/0x670 > [ce6e3d60] [c0014c9c] die+0x1cc/0x1d4 > [ce6e3d90] [c001cdb8] bad_page_fault+0x98/0xf0 > [ce6e3db0] [c0017d8c] handle_page_fault+0x7c/0x80 > --- Exception: 300 at fs_may_remount_ro+0x6c/0xd8 > LR = fs_may_remount_ro+0x3c/0xd8 > [ce6e3e90] [c00f1198] do_remount_sb+0x11c/0x164 > [ce6e3eb0] [c0113a3c] do_mount+0x538/0x86c > [ce6e3f10] [c0113e30] sys_mount+0xc0/0x120 > [ce6e3f40] [c00178d8] ret_from_syscall+0x0/0x38 > --- Exception: c01 at 0xfe5f8c4 > LR = 0x10051b88 > Instruction dump: > 38600001 4bbc95d1 801a0004 3aba0008 2f800000 419e0264 801a0018 7c4a1378 > 5400003a 7c400278 7c000034 5400d97e <0f000000> 83a20000 39200002 2f9d0002 > ---[ end trace 17c711f9d369c3a4 ]--- > Fixing recursive fault but reboot is needed! > BUG: scheduling while atomic: umount/0x00000001/1613, CPU#0 > Modules linked in: > Call Trace: > [ce6e3800] [c000b6a0] show_stack+0xe8/0x244 (unreliable) > [ce6e3850] [c04608c0] dump_stack+0x2c/0x44 > [ce6e3860] [c00282b0] __schedule_bug+0x9c/0xc4 > [ce6e3880] [c045cfe8] __schedule+0x488/0x5a4 > [ce6e38b0] [c045d2e0] schedule+0x40/0xa8 > [ce6e38c0] [c003973c] do_exit+0x644/0x670 > [ce6e3910] [c0014c9c] die+0x1cc/0x1d4 > [ce6e3940] [c0014fd0] _exception+0x130/0x170 > [ce6e3a30] [c00151d0] program_check_exception+0xd0/0x634 > [ce6e3a70] [c0017f38] ret_from_except_full+0x0/0x4c > --- Exception: 700 at rt_spin_lock_slowlock+0xa8/0x394 > LR = rt_spin_lock_slowlock+0x80/0x394 > [ce6e3bc0] [c045fc68] rt_spin_lock+0x58/0x90 > [ce6e3bd0] [c00efbbc] file_sb_list_del+0x48/0x88 > [ce6e3bf0] [c00f03ac] __fput+0x168/0x274 > [ce6e3c20] [c00f04f8] fput+0x40/0x58 > [ce6e3c30] [c00d3f74] remove_vma+0x78/0xd8 > [ce6e3c50] [c00d4150] exit_mmap+0x17c/0x1e4 > [ce6e3cc0] [c00318c0] mmput+0x6c/0x144 > [ce6e3ce0] [c003712c] exit_mm+0x15c/0x190 > [ce6e3d10] [c00391e8] do_exit+0xf0/0x670 > [ce6e3d60] [c0014c9c] die+0x1cc/0x1d4 > [ce6e3d90] [c001cdb8] bad_page_fault+0x98/0xf0 > [ce6e3db0] [c0017d8c] handle_page_fault+0x7c/0x80 > --- Exception: 300 at fs_may_remount_ro+0x6c/0xd8 > LR = fs_may_remount_ro+0x3c/0xd8 > [ce6e3e90] [c00f1198] do_remount_sb+0x11c/0x164 > [ce6e3eb0] [c0113a3c] do_mount+0x538/0x86c > [ce6e3f10] [c0113e30] sys_mount+0xc0/0x120 > [ce6e3f40] [c00178d8] ret_from_syscall+0x0/0x38 > --- Exception: c01 at 0xfe5f8c4 > LR = 0x10051b88 > -- 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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