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From: David Wang <00107082@163.com>
To: yjnworkstation@gmail.com
Cc: akpm@linux-foundation.org,
	linux-kernel@vger.kernel.org,
	linux-mm@kvack.org,
	willy@infradead.org
Subject: [BUG] 6.10.0-rc1: segfault at 0 when reboot with kernel config INIT_MLOCKED_ON_FREE_DEFAULT_ON=y
Date: Tue, 28 May 2024 23:13:40 +0800
Message-Id: <20240528151340.4282-1-00107082@163.com>
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Hi,

My kernel is 6.10.0-rc1 with CONFIG_INIT_MLOCKED_ON_FREE_DEFAULT_ON=y, and 
I got following screen when I execute `systemctl reboot` on my system.
(The text was extracted from a console image, there may be some parse error. And my kernel was tainted mostly because of nvidia driver)

	42.855067] watchdog: watchdog0: watchdog did not stop!
	42.905871] show_signal_msg: 14 callbacks suppressed
	42.905874) systemd-shutdow[1]: segfault at 0 ip 0000000000000000 sp 00007ffcc8af7318 error 14 likely on CPU 6 (core 4, socke 42.906017] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
	42.906080] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b 
	42.906143] CPU: 6 PID: 1 Comm: systemd-shutdow Tainted: P OE 6.10.0-rc1-linan-0 #244
	42.906220] Hardware name: Micro-Star International Co., Ltd. MS-7889/B450M MORTAR MAX (MS-7889), BIOS 2.80 06/10/2020 42.906308] Call Trace:
	42.906329] <TASK>
	42.906346] panic+0x31d/0x350
	42.906375) ? srso_return_thunk+0x5/0x5f
	42.906411] do_exit+0x968/0xad0
	42.906441] do_group_exit+0x2c/0x80
	42.906472] get_signal+0x876/0x8a0
	42.906502] arch_do_signal_or_restart+0x2a/0x240
	42.906544] irgentry_exit_to_user_mode+0xc2/0x160
	42.906585] asm_exc_page_fault+0x22/0x30
	42.906619] RIP: 0033:0x0
	42.906640] Code: Unable to access opcode bytes at 0xfffft fffffffd6. 
	42.906693] RSP: 002b:00007ffcc8af7318 EFLAGS: 00010206
	42.906736] RAX: 0000000000000011 RBX: 000000000328adea RCX: 0000000000000005 
	42.906794] RDX: 00007ffcc8af73b0 RSI: 0000000000000ea8 RDI: 0000000000000001 
	42.906852] RBP: 00007ffcc8af73be R08: 003b459fca9238c4 R09: 0000000000000069 
	42.906910] R10: 0000000000000008 R11: 0000000000000202 R12: 00007ffcc8af7330 
	42.906968] R13: 0000000000000ea8 R14: 0000000000000000 R15: 0000000000000000 
	42.907029] </TASK>
	42.907328] Kernel Offset: 0x21a00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) 
	43.081928) --- [ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---


I rebuild the kernel with `CONFIG_INIT_MLOCKED_ON_FREE_DEFAULT_ON not set`, the system can reboot normally.
My guess, some memory is zeroed unproperly when reboot?


David