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Date: Mon, 15 Dec 2014 11:21:01 +0800 From: Huang Ying <ying.huang@...el.com> To: "Eric W. Biederman" <ebiederm@...ssion.com> Cc: LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org> Subject: [LKP] [userns] BUG: unable to handle kernel NULL pointer dereference at (null) FYI, we noticed the below changes on git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-testing commit bbea5f5532501fdd67f46442ba7b1122d7ff3123 ("userns: Add a knob to disable setgroups on a per user namespace basis") +------------------------------------------+------------+------------+ | | f0d62aec93 | bbea5f5532 | +------------------------------------------+------------+------------+ | boot_successes | 24 | 11 | | boot_failures | 1 | 27 | | BUG:kernel_boot_hang | 1 | 8 | | BUG:unable_to_handle_kernel | 0 | 19 | | Oops | 0 | 19 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 19 | | backtrace:do_sys_open | 0 | 19 | | backtrace:SyS_open | 0 | 19 | +------------------------------------------+------------+------------+ [ 4.182286] init: Failed to create pty - disabling logging for job [ 4.185260] init: Failed to create pty - disabling logging for job [ 4.187855] init: Failed to create pty - disabling logging for job [ 14.400216] BUG: unable to handle kernel NULL pointer dereference at (null) [ 14.401009] IP: [< (null)>] (null) [ 14.401009] PGD 15db4067 PUD 15852067 PMD 0 [ 14.401009] Oops: 0010 [#1] SMP [ 14.401009] Modules linked in: [ 14.401009] CPU: 1 PID: 311 Comm: trinity-main Not tainted 3.18.0-00702-g696484a #3 [ 14.401009] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 14.401009] task: ffff88001581d8b0 ti: ffff8800158c0000 task.ti: ffff8800158c0000 [ 14.401009] RIP: 0010:[<0000000000000000>] [< (null)>] (null) [ 14.401009] RSP: 0018:ffff8800158c3d80 EFLAGS: 00010246 [ 14.401009] RAX: ffffffff818ebc00 RBX: ffff8800158c3e38 RCX: ffff880014b44f00 [ 14.401009] RDX: 0000000000000000 RSI: ffff8800158c3e38 RDI: ffff880014b44f00 [ 14.401009] RBP: ffff8800158c3e28 R08: 0000000000000000 R09: 0000000000000000 [ 14.401009] R10: 0000000000000000 R11: ffff880014b44f00 R12: ffff880014cbd800 [ 14.401009] R13: ffff8800158c3de8 R14: 0000000000000000 R15: 0000000000000041 [ 14.401009] FS: 00007ff618590700(0000) GS:ffff880013700000(0000) knlGS:0000000000000000 [ 14.401009] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 14.401009] CR2: 0000000000000000 CR3: 0000000015e83000 CR4: 00000000000006e0 [ 14.401009] Stack: [ 14.401009] ffffffff811f2398 ffff880015e59000 ffff88001581d8b0 ffff88001581d8b0 [ 14.401009] ffff880014b44f00 ffff8800158c3f24 ffff880015e59000 ffff88001581d8b0 [ 14.401009] ffff88001581d8b0 00000000df9a5ea7 0000000000000000 ffff8800132adb60 [ 14.401009] Call Trace: [ 14.401009] [<ffffffff811f2398>] ? path_openat+0x538/0x680 [ 14.401009] [<ffffffff811f449a>] do_filp_open+0x3a/0xb0 [ 14.401009] [<ffffffff81201717>] ? __alloc_fd+0xa7/0x130 [ 14.401009] [<ffffffff811e13bc>] do_sys_open+0x12c/0x220 [ 14.401009] [<ffffffff811e14ce>] SyS_open+0x1e/0x20 [ 14.401009] [<ffffffff8189f829>] system_call_fastpath+0x12/0x17 [ 14.401009] Code: Bad RIP value. [ 14.401009] RIP [< (null)>] (null) [ 14.401009] RSP <ffff8800158c3d80> [ 14.401009] CR2: 0000000000000000 [ 14.428875] ---[ end trace cd2f260044a49852 ]--- [ 14.429656] Kernel panic - not syncing: Fatal exception Thanks, Fengguang View attachment "config-3.18.0-rc6-00015-gbbea5f5" of type "text/plain" (126510 bytes) View attachment ".dmesg" of type "text/plain" (36049 bytes) _______________________________________________ LKP mailing list LKP@...ux.intel.com
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