Race condition in kernel How to cause
How it looksNov 24 13:24:39 clondike2 kernel: BUG: unable to handle kernel NULL pointer dereference \ at 000000000000039f Nov 24 13:24:39 clondike2 kernel: IP: [] director_task_fork+0x19/0x70 Nov 24 13:24:39 clondike2 kernel: PGD 2b92e067 PUD 2b95d067 PMD 0 Nov 24 13:24:39 clondike2 kernel: Oops: 0000 [#2] SMP Nov 24 13:24:39 clondike2 kernel: Modules linked in: Nov 24 13:24:39 clondike2 kernel: CPU 0 Nov 24 13:24:39 clondike2 kernel: Pid: 3776, comm: 10_linux Tainted: G D W \ 3.6.11 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform Nov 24 13:24:39 clondike2 kernel: RIP: 0010:[] [] director_task_fork+0x19/0x70 Nov 24 13:24:39 clondike2 kernel: RSP: 0018:ffff88002b92de80 EFLAGS: 00010286 Nov 24 13:24:39 clondike2 kernel: RAX: fffffffffffffdff RBX: ffff88003cafb380 RCX: 0000000000000000 Nov 24 13:24:39 clondike2 kernel: RDX: 0000000000000000 RSI: fffffffffffffdff RDI: ffff88003cafb380 Nov 24 13:24:39 clondike2 kernel: RBP: fffffffffffffdff R08: 00007f3febe069d0 R09: ffffffff8109debf Nov 24 13:24:39 clondike2 kernel: R10: ffff88003fffefb8 R11: 00000000000153e0 R12: fffffffffffffdff Nov 24 13:24:39 clondike2 kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Nov 24 13:24:39 clondike2 kernel: FS: 00007f3febe06700(0000) GS:ffff88003fc00000(0000) \ knlGS:0000000000000000 Nov 24 13:24:39 clondike2 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Nov 24 13:24:39 clondike2 kernel: CR2: 000000000000039f CR3: 000000002b950000 CR4: 00000000000407b0 Nov 24 13:24:39 clondike2 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Nov 24 13:24:39 clondike2 kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Nov 24 13:24:39 clondike2 kernel: Process 10_linux (pid: 3776, threadinfo ffff88002b92c000, \ task ffff88003cafb380) Nov 24 13:24:39 clondike2 kernel: Stack: Nov 24 13:24:39 clondike2 kernel: 0000000000000000 fffffffffffffdff 0000000000000000 ffffffff8187cf86 Nov 24 13:24:39 clondike2 kernel: ffffffff8187cf40 fffffffffffffdff 0000000001200011 ffffffff8109f16a Nov 24 13:24:39 clondike2 kernel: 0000000000000000 0000000003761be4 0000000000000000 00007fff2b5fcbf0 Nov 24 13:24:39 clondike2 kernel: Call Trace: Nov 24 13:24:39 clondike2 kernel: [] ? tcmi_syscall_hooks_post_fork+0x46/0xb0 Nov 24 13:24:39 clondike2 kernel: [] ? tcmi_syscall_hooks_other_exit+0x30/0x30 Nov 24 13:24:39 clondike2 kernel: [] ? do_fork+0xea/0x3b0 Nov 24 13:24:39 clondike2 kernel: [] ? sys_newstat+0x31/0x50 Nov 24 13:24:39 clondike2 kernel: [] ? stub_clone+0x13/0x20 Nov 24 13:24:39 clondike2 kernel: [] ? system_call_fastpath+0x16/0x1b Nov 24 13:24:39 clondike2 kernel: Code: 00 00 48 83 ec 08 48 83 c4 08 e9 e3 16 00 00 0f 1f 00 48 \ 83 ec 18 48 85 f6 48 89 5c 24 08 48 89 6c 24 10 48 89 fb 48 89 f5 74 0a <8b> b6 a0 05 00 00 85 f6 \ 74 15 31 c0 48 8b 5c 24 08 48 8b 6c 24 Nov 24 13:24:39 clondike2 kernel: RIP [] director_task_fork+0x19/0x70 Nov 24 13:24:39 clondike2 kernel: RSP Nov 24 13:24:39 clondike2 kernel: CR2: 000000000000039f Nov 24 13:24:39 clondike2 kernel: ---[ end trace 6d005f3454fe936c ]--- |