Hi! While playing with user namespaces my kernel crashed under heavy load. Kernel is 3.9.0 plus some trivial patches. [35355.882105] BUG: unable to handle kernel NULL pointer dereference at 00000000000001a8 [35355.883056] IP: [<ffffffff811297d9>] mem_cgroup_page_lruvec+0x79/0x90 [35355.883056] PGD 0 [35355.883056] Oops: 0000 [#1] SMP [35355.883056] CPU 3 [35355.883056] Pid: 477, comm: kswapd0 Not tainted 3.9.0+ #12 Bochs Bochs [35355.883056] RIP: 0010:[<ffffffff811297d9>] [<ffffffff811297d9>] mem_cgroup_page_lruvec+0x79/0x90 [35355.883056] RSP: 0000:ffff88003d523aa8 EFLAGS: 00010002 [35355.883056] RAX: 0000000000000138 RBX: ffff88003fffa600 RCX: ffff88003e04a800 [35355.883056] RDX: 0000000000000020 RSI: 0000000000000000 RDI: 0000000000028500 [35355.883056] RBP: ffff88003d523ab8 R08: 0000000000000000 R09: 0000000000000000 [35355.883056] R10: 0000000000000000 R11: dead000000100100 R12: ffffea0000a14000 [35355.883056] R13: ffff88003e04b138 R14: ffff88003d523bb8 R15: ffffea0000a14020 [35355.883056] FS: 0000000000000000(0000) GS:ffff88003fd80000(0000) knlGS:0000000000000000 [35355.883056] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [35355.883056] CR2: 00000000000001a8 CR3: 0000000001a0b000 CR4: 00000000000006e0 [35355.883056] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [35355.883056] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [35355.883056] Process kswapd0 (pid: 477, threadinfo ffff88003d522000, task ffff88003db6dc40) [35355.883056] Stack: [35355.883056] 0000000000000014 ffffea0000a14000 ffff88003d523b28 ffffffff810ea4c5 [35355.883056] ffff88003d523b90 ffff88003fffa9c0 ffff88003d523b98 0000000000000020 [35355.883056] ffff88003fffa600 0000000200000003 ffff88003fffa600 ffff88003d523b98 [35355.883056] Call Trace: [35355.883056] [<ffffffff810ea4c5>] move_active_pages_to_lru+0x65/0x190 [35355.883056] [<ffffffff810ec4e7>] shrink_active_list+0x297/0x380 [35355.883056] [<ffffffff810ebff6>] ? shrink_inactive_list+0x1a6/0x400 [35355.883056] [<ffffffff810ec815>] shrink_lruvec+0x245/0x4b0 [35355.883056] [<ffffffff810ecae6>] shrink_zone+0x66/0x180 [35355.883056] [<ffffffff810edcb4>] balance_pgdat+0x474/0x5b0 [35355.883056] [<ffffffff810edf58>] kswapd+0x168/0x440 [35355.883056] [<ffffffff8105d310>] ? abort_exclusive_wait+0xb0/0xb0 [35355.883056] [<ffffffff810eddf0>] ? balance_pgdat+0x5b0/0x5b0 [35355.883056] [<ffffffff8105c5fb>] kthread+0xbb/0xc0 [35355.883056] [<ffffffff8105c540>] ? __kthread_unpark+0x50/0x50 [35355.883056] [<ffffffff81748eac>] ret_from_fork+0x7c/0xb0 [35355.883056] [<ffffffff8105c540>] ? __kthread_unpark+0x50/0x50 [35355.883056] Code: 89 50 08 48 89 d1 0f 1f 40 00 49 8b 04 24 48 89 c2 48 c1 e8 38 83 e0 03 48 c1 ea 3a 48 69 c0 38 01 00 00 48 03 84 d1 e0 02 00 00 <48> 3b 58 70 75 0a 48 8b 5d f0 4c 8b 65 f8 c9 c3 48 89 58 70 eb [35355.883056] RIP [<ffffffff811297d9>] mem_cgroup_page_lruvec+0x79/0x90 [35355.883056] RSP <ffff88003d523aa8> [35355.883056] CR2: 00000000000001a8 [35355.883056] ---[ end trace 2c9b8eec517f960d ]--- -- Thanks, //richard -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>