FYI, we noticed the below changes on
https://github.com/alaahl/linux.git for-upstream
commit 9bd5b8dffd77ec3d258425e9f4dd4f31c41a30b0 ("regression: Disable FENTRY")
+------------------------------------------+------------+------------+
| | e2f9dc3bd2 | 9bd5b8dffd |
+------------------------------------------+------------+------------+
| boot_successes | 68 | 0 |
| boot_failures | 2 | 26 |
| BUG:kernel_test_oversize | 2 | |
| BUG:unable_to_handle_kernel | 0 | 26 |
| Oops | 0 | 26 |
| RIP:copy_process | 0 | 26 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 26 |
| backtrace:_do_fork | 0 | 26 |
+------------------------------------------+------------+------------+
[ 78.786803] Running tests again, along with the function tracer
[ 78.788785] Running tests on trace events:
[ 78.790384] Testing event sys_exit:
[ 78.791562] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 78.795018] IP: [<ffffffff810963c5>] copy_process+0x1f/0x1826
[ 78.796916] PGD 0
[ 78.798172] Oops: 0000 [#1] SMP
[ 78.799768] CPU: 0 PID: 2 Comm: kthreadd Not tainted 4.4.0-rc1-00163-g9bd5b8d #1
[ 78.802492] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 78.805397] task: ffff880013f0e9c0 ti: ffff880013f24000 task.ti: ffff880013f24000
[ 78.818230] RIP: 0010:[<ffffffff810963c5>] [<ffffffff810963c5>] copy_process+0x1f/0x1826
[ 78.821196] RSP: 0000:ffff880013f27db0 EFLAGS: 00010282
[ 78.822776] RAX: ffffffff810b23a7 RBX: ffff8800154f44c0 RCX: 0000000000000000
[ 78.824760] RDX: ffff8800154f4498 RSI: ffffffff810b23a7 RDI: 0000000000800711
[ 78.834825] RBP: ffff880013f27e80 R08: 0000000000000000 R09: 0000000000000000
[ 78.838880] R10: 0000000000000000 R11: ffffffff8202854a R12: ffffffff810b23a7
[ 78.840819] R13: 0000000000000000 R14: 0000000000800711 R15: ffff8800154f4498
[ 78.842683] FS: 0000000000000000(0000) GS:ffff880014a00000(0000) knlGS:0000000000000000
[ 78.845266] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 78.855092] CR2: 0000000000000000 CR3: 0000000001e08000 CR4: 00000000000006f0
[ 78.859161] Stack:
[ 78.860224] 0000000000000000 ffff8800154f4498 ffff880013f27e78 ffffffff819c0ffe
[ 78.863239] 0000000000000800 ffffffff820287ce 0000000000000000 ffffffff810b2b7c
[ 78.874384] ffff880013f27ef8 ffffffff8110a90f ffffffff81098026 ffff8800154f44c0
[ 78.879410] Call Trace:
[ 78.880440] [<ffffffff819c0ffe>] ? trace+0x5f/0x93
[ 78.881843] [<ffffffff820287ce>] ? event_trace_self_tests_init+0x149/0x149
[ 78.883582] [<ffffffff810b2b7c>] ? kthreadd+0xf4/0x13a
[ 78.885041] [<ffffffff8110a90f>] ? ftrace_ops_no_ops+0x151/0x191
[ 78.894861] [<ffffffff81098026>] ? kernel_thread+0x4/0x2b
[ 78.898665] [<ffffffff810b23a7>] ? __kthread_parkme+0x87/0x87
[ 78.900426] [<ffffffff810b23a7>] ? __kthread_parkme+0x87/0x87
[ 78.902183] [<ffffffff810b23a7>] ? __kthread_parkme+0x87/0x87
[ 78.903943] [<ffffffff81097d69>] _do_fork+0xa8/0x361
[ 78.913773] [<ffffffff810b23a7>] ? __kthread_parkme+0x87/0x87
[ 78.915511] [<ffffffff8109802b>] ? kernel_thread+0x9/0x2b
[ 78.919281] [<ffffffff8109804b>] kernel_thread+0x29/0x2b
[ 78.920931] [<ffffffff810b2b7c>] kthreadd+0xf4/0x13a
[ 78.922538] [<ffffffff810b2a88>] ? kthread_stop+0x10c/0x10c
[ 78.924251] [<ffffffff819bf35f>] ret_from_fork+0x3f/0x70
[ 78.933953] [<ffffffff810b2a88>] ? kthread_stop+0x10c/0x10c
[ 78.937784] Code: 01 48 89 de e8 dd 84 0e 00 5b 5d c3 55 48 89 e5 41 57 41 56 41 55 41 54 41 52 53 4c 8d 55 10 48 81 ec a0 00 00 00 e8 cb ab 92 00 <49> 8b 02 48 89 7d b8 48 89 b5 50 ff ff ff 48 89 95 48 ff ff ff
[ 78.959947] RIP [<ffffffff810963c5>] copy_process+0x1f/0x1826
[ 78.961807] RSP <ffff880013f27db0>
[ 78.963149] CR2: 0000000000000000
[ 78.964464] ---[ end trace bce589f6b0fc4786 ]---
[ 78.974094] Kernel panic - not syncing: Fatal exception
Thanks,
Ying Huang