This is another kconfig, produced a bit different call trace, however also related to sysfs_read_file(). [ 14.619411] warning: process `trinity-child0' used the deprecated sysctl system call with [ 32.792672] trinity-child0 (129): Using mlock ulimits for SHM_HUGETLB is deprecated [ 55.093218] BUG: unable to handle kernel paging request at 00007f4fa44392a0 [ 55.093948] IP: [] strnlen+0x23/0x80 [ 55.093948] PGD 0 [ 55.093948] Oops: 0000 [#1] [ 55.093948] CPU 0 [ 55.093948] Pid: 145, comm: trinity-child0 Not tainted 3.5.0-rc1+ #4 Bochs Bochs [ 55.093948] RIP: 0010:[] [] strnlen+0x23/0x80 [ 55.093948] RSP: 0018:ffff88000ed65d38 EFLAGS: 00010206 [ 55.093948] RAX: ffff88000ed65e38 RBX: ffff88000edb2000 RCX: 000000000000c0e4 [ 55.093948] RDX: 00007f4fa44392a0 RSI: ffffffffffffffff RDI: 00007f4fa44392a0 [ 55.093948] RBP: ffff88000ed65d38 R08: 000000000000ffff R09: 000000000000ffff [ 55.093948] R10: 0000000000000000 R11: ffff88000ed58560 R12: 00007f4fa44392a0 [ 55.093948] R13: ffff88008edb1fff R14: 000000000000ffff R15: 0000000000000000 [ 55.093948] FS: 00007ffb40b54700(0000) GS:ffffffff821b7000(0000) knlGS:0000000000000000 [ 55.093948] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 55.093948] CR2: 00007f4fa44392a0 CR3: 000000000ed59000 CR4: 00000000000006b0 [ 55.093948] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 55.093948] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 55.093948] Process trinity-child0 (pid: 145, threadinfo ffff88000ed64000, task ffff88000ed58000) [ 55.093948] Stack: [ 55.093948] ffff88000ed65d78 ffffffff814587fc ffffffff821e9960 ffffffff82142ce5 [ 55.093948] ffff88008edb1fff ffff88000ed65e10 ffffffff82142ce5 ffff88000edb2000 [ 55.093948] ffff88000ed65df8 ffffffff81459763 ffff88000ed65da8 ffff88000ed58000 [ 55.093948] Call Trace: [ 55.093948] [] string.isra.4+0x4c/0x120 [ 55.093948] [] vsnprintf+0x313/0x890 [ 55.093948] [] ? param_attr_show+0x3a/0xb0 [ 55.093948] [] sprintf+0x48/0x50 [ 55.093948] [] param_get_charp+0x21/0x30 [ 55.093948] [] param_attr_show+0x50/0xb0 [ 55.093948] [] module_attr_show+0x28/0x40 [ 55.093948] [] sysfs_read_file+0x120/0x280 [ 55.093948] [] vfs_read+0xff/0x210 [ 55.093948] [] sys_read+0x5d/0xc0 [ 55.093948] [] system_call_fastpath+0x16/0x1b [ 55.093948] Code: 5d c3 66 0f 1f 44 00 00 55 48 83 05 b7 ea b2 01 01 48 85 f6 48 89 e5 74 58 48 8b 0d b0 ea b2 01 48 83 c1 01 48 89 0d a5 ea b2 01 <80> 3f 00 74 41 48 8b 05 a1 ea b2 01 48 8d 50 01 48 01 c6 48 89 [ 55.093948] RIP [] strnlen+0x23/0x80 [ 55.093948] RSP [ 55.093948] CR2: 00007f4fa44392a0 Thanks, Fengguang