On Thu, Jan 04, 2018 at 11:38:25AM -0500, Pavel Tatashin wrote: > I am getting the following panic when trying to boot 4.4.110rc1 on > Intel(R) Xeon(R) CPU E5-2630: > > [ 5.923489] BUG: unable to handle kernel NULL pointer dereference > at 000000000000000d > [ 5.932259] IP: [<ffffffff810e70d2>] dyntick_save_progress_counter+0x12/0x50 > [ 5.940142] PGD 0 > [ 5.942400] Oops: 0002 [#1] SMP > [ 5.946023] Modules linked in: > [ 5.949448] CPU: 5 PID: 8 Comm: rcu_sched Not tainted > 4.4.110-rc1_pt_linux-4.4.110rc1 #1 > [ 5.958484] Hardware name: Oracle Corporation ORACLE SERVER > X6-2/ASM,MOTHERBOARD,1U, BIOS 38050100 08/30/2016 > [ 5.969552] task: ffff881ff2f1ab00 ti: ffff881ff2f24000 task.ti: > ffff881ff2f24000 > [ 5.977905] RIP: 0010:[<ffffffff810e70d2>] [<ffffffff810e70d2>] > dyntick_save_progress_counter+0x12/0x50 > [ 5.988505] RSP: 0000:ffff881ff2f27dc0 EFLAGS: 00010046 > [ 5.994434] RAX: 0000000000000001 RBX: ffffffff81b02140 RCX: ffff883fec768000 > [ 6.002403] RDX: 0000000000000000 RSI: ffff881ff2f27e5f RDI: ffff88407e958140 > [ 6.010368] RBP: ffff881ff2f27dc0 R08: ffff881ff2f27e78 R09: 000000016110f359 > [ 6.018333] R10: 0000000000000b10 R11: 0000000000000000 R12: ffffffff81b02140 > [ 6.026297] R13: 00000000ffffffdf R14: 0000000000000021 R15: 0000000200000000 > [ 6.034262] FS: 0000000000000000(0000) GS:ffff881fff940000(0000) > knlGS:0000000000000000 > [ 6.043293] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 6.049707] CR2: 000000000000000d CR3: 0000000001aa6000 CR4: 0000000000360670 > [ 6.057672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 6.065638] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 6.073603] Stack: > [ 6.075847] ffff881ff2f27e18 ffffffff810e8fac 0000000000000202 > ffff881ff2f27e60 > [ 6.084158] ffff881ff2f27e5f ffffffff810e70c0 ffffffff81b02140 > ffffffff81b127a0 > [ 6.092465] 0000000000000001 0000000000000000 0000000000000003 > ffff881ff2f27eb8 > [ 6.100768] Call Trace: > [ 6.103501] [<ffffffff810e8fac>] force_qs_rnp+0xdc/0x150 > [ 6.109527] [<ffffffff810e70c0>] ? rcu_start_gp+0x70/0x70 > [ 6.115654] [<ffffffff810ea118>] rcu_gp_kthread+0x468/0x9b0 > [ 6.121976] [<ffffffff810c9190>] ? prepare_to_wait_event+0xf0/0xf0 > [ 6.128973] [<ffffffff810e9cb0>] ? rcu_process_callbacks+0x5f0/0x5f0 > [ 6.136167] [<ffffffff810a4a25>] kthread+0xe5/0x100 > [ 6.141710] [<ffffffff810a4940>] ? kthread_park+0x60/0x60 > [ 6.147840] [<ffffffff81714e8f>] ret_from_fork+0x3f/0x70 > [ 6.153868] [<ffffffff810a4940>] ? kthread_park+0x60/0x60 > > I tried to bisect the problem, but when I try to boot only with: > "KAISER: Kernel Address Isolation" machine hangs during boot and > reboots without any panic message. > > 4.4.109 boots fine > 4.9.75rc1 also boots fine. Hm, so I'm guessing 4.15-rc6 also works? Odd that 4.9.75-rc1 fails. Adding Jiri and Hugh and Dave here to see if they have seen this before... thanks, greg k-h