Technical Tip: Kernel Panic on FortiGate-7xF running v7.4.8

[alif]

Description	This article describes a Kernel panic observed on FortiGate-7x.
Scope	FortiGate-7xF.
Solution	When FortiGate-7x is powered off by running the 'execute shutdown' command, the following Kernel panic is observed. FortiGate-71F # exec shutdown This operation will shutdown the system ! Do you want to continue? (y/n)y System is shutting down... The system is going down NOW !! FortiGate-71F # The system is halted. Unable to handle kernel NULL pointer dereference at virtual address 0000000c pgd = ffffffc0bc5fc000 [0000000c] *pgd=0000000000000000, *pud=0000000000000000 Internal error: Oops: 96000045 [#1] SMP Modules linked in: filter4 task: ffffffc0e4a99440 ti: ffffffc0b4a00000 task.ti: ffffffc0b4a00000 PC is at wdt_sys_halt+0x24/0xa0 LR is at machine_halt+0xc/0x4c pc : [<ffffffc0003a5e74>] lr : [<ffffffc000084390>] pstate: 60000145 sp : ffffffc0b4a03d40 x29: ffffffc0b4a03d40 x28: ffffffc0b4a00000 x27: ffffffc0004da000 x26: 000000000000008e x25: 00000000000007d1 x24: 0000000000000015 x23: 0000000060000000 x22: ffffffc000808000 x21: 00000000fee1dead x20: ffffffc000797090 x19: 00000000cdef0123 x18: 0000000000000000 x17: 0000007f8ba56be0 x16: ffffffc0000a0ee4 x15: 0000007f8ba26210 x14: ffffffc0bcd33f00 x13: 000000000000fc84 x12: 0000000000000030 x11: 0000000000000001 x10: 00000000000003ac x9 : 0000000000000006 x8 : 0000000000000000 x7 : 00000000000003f3 x6 : ffffffc0007e3eae x5 : ffffffc0007e46ec x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 000000000000000c Process initXXXXXXXXXXX (pid: 469, stack limit = 0xffffffc0b4a00058) Stack: (0xffffffc0b4a03d40 to 0xffffffc0b4a04000) 3d40: b4a03d70 ffffffc0 00084390 ffffffc0 cdef0123 00000000 00797090 ffffffc0 3d60: fee1dead 00000000 8c3ce6c8 0000007f b4a03d80 ffffffc0 000b039c ffffffc0 3d80: b4a03d90 ffffffc0 000b0b78 ffffffc0 cd2e93f0 0000007f 000837dc ffffffc0 3da0: 00000000 00000000 585e5838 00000055 ffffffff ffffffff 8ba7d93c 0000007f 3dc0: 00000000 00000000 eff7ce20 ffffffc0 e4a99800 ffffffc0 271ae705 1b75b31a 3de0: b4a03e10 ffffffc0 00080950 ffffffc0 babc7d80 ffffffc0 babc7cc0 ffffffc0 3e00: babc7a80 ffffffc0 271ae705 1b75b31a cd2e93f0 0000007f 00083890 ffffffc0 3e20: 00000000 00000000 585e5838 00000055 ffffffff ffffffff 8ba7d920 0000007f 3e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 3e60: 00000000 00000000 00000000 00000000 00000000 00000000 b4a03eb0 ffffffc0 3e80: b4a03eb0 ffffffc0 00089400 ffffffc0 00000008 00000000 00000000 00000000 3ea0: 00000000 00000000 b4a03ea8 ffffffc0 00000000 00000000 00083884 ffffffc0 3ec0: 00000000 00000000 271ae705 1b75b31a fee1dead ffffffff 28121969 00000000 3ee0: cdef0123 ffffffff 8c3ce6c8 0000007f 8bb1f788 0000007f 8960a700 0000007f 3f00: 8960a988 0000007f 8bed6380 0000007f 0000008e 00000000 00000000 00000000 3f20: 00000001 00000000 8960a460 0000007f 00000001 00000000 00002880 00000000 3f40: 000071d8 00000000 000028f8 00000000 5a36d190 00000055 8ba7d920 0000007f 3f60: 00003c68 00000000 cd2e9418 0000007f 585e5838 00000055 cd2e94d8 0000007f 3f80: 00000010 00000000 00000001 00000000 5f2ae000 00000055 5f2ae000 00000055 3fa0: 5f2ae000 00000055 00000019 00000000 00000000 00000000 cd2e93f0 0000007f 3fc0: 5593b8e4 00000055 cd2e93f0 0000007f 8ba7d93c 0000007f 60000000 00000000 3fe0: fee1dead ffffffff 0000008e 00000000 819f062a 765db943 ffffffff ffffffff Call trace: [<ffffffc0003a5e74>] wdt_sys_halt+0x24/0xa0 [<ffffffc000084390>] machine_halt+0xc/0x4c [<ffffffc0000b039c>] kernel_halt+0x4c/0x54 [<ffffffc0000b0b78>] sys_reboot+0x208/0x220 Code: f0002316 52800021 f94712c0 91003000 (b9000001) ---[ end trace f229355f0a64a24f ]--- Kernel panic - not syncing: Fatal exception Call trace: [<ffffffc000085530>] dump_backtrace+0x0/0x140 [<ffffffc0004cb49c>] dump_stack+0x14/0x1c [<ffffffc0004cbd70>] panic+0xb8/0x1dc [<ffffffc000085834>] die+0x1a4/0x1c4 [<ffffffc00008cb08>] __do_kernel_fault.part.0+0x68/0x84 [<ffffffc00008cec8>] do_page_fault+0x3a4/0x3ac [<ffffffc00008cf70>] do_translation_fault+0xa0/0xc0 [<ffffffc000080950>] do_mem_abort+0x50/0xc4 Exception stack(0xffffffc0b4a03b70 to 0xffffffc0b4a03c90) 3b60: cdef0123 00000000 00797090 ffffffc0 3b80: b4a03d40 ffffffc0 003a5e74 ffffffc0 007e3978 ffffffc0 00794cd0 ffffffc0 3ba0: b4a03be0 ffffffc0 0009cd5c ffffffc0 b4a03be0 ffffffc0 0009cc9c ffffffc0 3bc0: 007e4a68 ffffffc0 00794cd0 ffffffc0 00794cd0 ffffffc0 00000400 00000000 3be0: b4a03c40 ffffffc0 0009d0a0 ffffffc0 00794cd0 ffffffc0 0000000e 00000000 3c00: 00794d10 ffffffc0 00000000 00000000 000000ff 00000000 271ae705 1b75b31a 3c20: 0000000c 00000000 00000001 00000000 00000000 00000000 00000000 00000000 3c40: 00000000 00000000 007e46ec ffffffc0 007e3eae ffffffc0 000003f3 00000000 3c60: 00000000 00000000 00000006 00000000 000003ac 00000000 00000001 00000000 3c80: 00000030 00000000 0000fc84 00000000 [<ffffffc000083374>] el1_da+0x24/0x78 [<ffffffc000084390>] machine_halt+0xc/0x4c [<ffffffc0000b039c>] kernel_halt+0x4c/0x54 [<ffffffc0000b0b78>] sys_reboot+0x208/0x220 Rebooting in 5 seconds.. FortiGate-71F (07:26-06.02.2023) Ver:05000100 Serial number: FGT71Fxxxxxxxxx CPU: 1200MHz Total RAM: 4 GB Initializing boot device... Initializing MAC... NP6XLITE#0 Please wait for OS to boot, or press any key to display configuration menu...... FortiGate-71F # The issue will be resolved in v7.4.9 and v7.6.4.