On Wed, Sep 16, 2015 at 8:29 PM, kernel test robot <[email protected]> wrote: > FYI, we noticed the below changes on > > https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git > x86/entry_compat > commit d47479d0345d4031e660c59bfe92a2dd317c8eaf ("x86/entry/64/compat: > Migrate the body of the syscall entry to C") >
That was a cute bug. I reproduced it, fixed it, and updated my branch. Thanks! (Grr, assembly code. On the bright side, the diffstat is even better now, since I fixed it by deleting even more asm!) --Andy > > +------------------------------------------------------+------------+------------+ > | | 87475de25f | > d47479d034 | > +------------------------------------------------------+------------+------------+ > | boot_successes | 189 | 13 > | > | boot_failures | 11 | 210 > | > | BUG:kernel_test_crashed | 10 | > | > | WARNING:at_mm/page_alloc.c:#__alloc_pages_nodemask() | 1 | > | > | backtrace:packet_setsockopt | 1 | > | > | backtrace:compat_SyS_socketcall | 1 | > | > | kernel_BUG_at_arch/x86/kernel/traps.c | 0 | 47 > | > | invalid_opcode | 0 | 47 > | > | RIP:fixup_bad_iret | 0 | 47 > | > | Kernel_panic-not_syncing:Fatal_exception | 0 | 47 > | > | BUG:kernel_boot_hang | 0 | 163 > | > +------------------------------------------------------+------------+------------+ > > > [ 3.456532] ------------[ cut here ]------------ > [ 3.457007] kernel BUG at arch/x86/kernel/traps.c:568! > [ 3.457007] invalid opcode: 0000 [#1] SMP > [ 3.457007] Modules linked in: > [ 3.457007] CPU: 0 PID: 82 Comm: rcS Not tainted 4.2.0-rc7-00104-gd47479d > #1 > [ 3.457007] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > 1.7.5-20140531_083030-gandalf 04/01/2014 > [ 3.457007] task: ffff880013a1c000 ti: ffff880013a9c000 task.ti: > ffff880013a9c000 > [ 3.457007] RIP: 0010:[<ffffffff810151de>] [<ffffffff810151de>] > fixup_bad_iret+0x5e/0x60 > [ 3.457007] RSP: 0000:ffff880013a9fee8 EFLAGS: 00010046 > [ 3.457007] RAX: ffff880013a9ff50 RBX: ffff880013a9ff50 RCX: > ffffffff81893957 > [ 3.457007] RDX: 0000000000000008 RSI: ffff880013a9ff10 RDI: > ffff880013a9ff50 > [ 3.457007] RBP: ffff880013a9ff00 R08: 0000000000000000 R09: > 0000000000000000 > [ 3.457007] R10: ffffffff81894f92 R11: ffffffff81894f92 R12: > ffff880013aa0000 > [ 3.457007] R13: ffff880013a9ff10 R14: 0000000000000000 R15: > 0000000000000000 > [ 3.457007] FS: 0000000000000000(0000) GS:ffff880012200000(0000) > knlGS:0000000000000000 > [ 3.457007] CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b > [ 3.457007] CR2: 00000000ffaeafa0 CR3: 0000000013aa4000 CR4: > 00000000000006f0 > [ 3.457007] Stack: > [ 3.457007] 0000000000000001 0000000000000000 0000000000000000 > 0000000000000000 > [ 3.457007] ffffffff81895219 ffffffff81894f92 0000000000000000 > 0000000000000000 > [ 3.457007] 0000000000000000 0000000000000000 0000000000000000 > 0000000000000000 > [ 3.457007] Call Trace: > [ 3.457007] [<ffffffff81895219>] error_entry+0xa9/0xb0 > [ 3.457007] [<ffffffff81894f92>] ? general_protection+0x12/0x30 > [ 3.457007] [<ffffffff81894f92>] ? general_protection+0x12/0x30 > [ 3.457007] Code: 88 00 00 00 e8 e4 ab 3e 00 ba 88 00 00 00 4c 89 ee 48 89 > df e8 d4 ab 3e 00 41 f6 44 24 e0 03 74 0a 48 89 d8 5b 41 5c 41 5d 5d c3 <0f> > 0b 66 66 66 66 90 55 48 89 e5 eb 13 66 66 90 0f 0b bf 7d 00 > [ 3.457007] RIP [<ffffffff810151de>] fixup_bad_iret+0x5e/0x60 > [ 3.457007] RSP <ffff880013a9fee8> > [ 3.457007] ---[ end trace 7cb2870a2255142c ]--- > [ 3.457007] Kernel panic - not syncing: Fatal exception > [ 3.457007] Kernel Offset: disabled > > > Thanks, > Ying Huang -- Andy Lutomirski AMA Capital Management, LLC -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
