blob: 44b5a9009da75084adcb1828cd42c116699ab4dc (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
qemu-system-arm: crashes raspian kernels with divide-by-zero
While trying to boot a arm kernel for a raspi2 machine (kernel7-4.9.41-stretch.img in my case, but applies to other versions, too) the kernel crash with a division by zero. The output on the sreial console is:
[ 10.022377] [<8011d344>] (__warn) from [<8011d42c>] (warn_slowpath_null+0x30/0x38)
[ 10.024726] [<8011d42c>] (warn_slowpath_null) from [<804da378>] (uart_get_baud_rate+0xf8/0x160)
...
[ 10.094933] Hardware name: BCM2835
[ 10.101507] [<8010fb3c>] (unwind_backtrace) from [<8010c058>] (show_stack+0x20/0x24)
[ 10.105413] [<8010c058>] (show_stack) from [<80455f84>] (dump_stack+0xd4/0x118)
[ 10.140268] [<80455f84>] (dump_stack) from [<8010bed4>] (__div0+0x24/0x28)
[ 10.143065] [<8010bed4>] (__div0) from [<8045498c>] (Ldiv0+0x8/0x14)
[ 10.145553] [<8045498c>] (Ldiv0) from [<804e5538>] (pl011_set_termios+0x9c/0x37c)
[ 10.148017] [<804e5538>] (pl011_set_termios) from [<804da954>] (uart_change_speed+0x40/0xfc)
[ 10.185887] [<804da954>] (uart_change_speed) from [<804ddedc>] (uart_startup.part.3+0xa4/0x13c)
[ 10.222187] [<804ddedc>] (uart_startup.part.3) from [<804ddfcc>] (uart_port_activate+0x58/0x64)
[ 10.226014] [<804ddfcc>] (uart_port_activate) from [<804c93b8>] (tty_port_open+0xa0/0xe0)
[ 10.228398] [<804c93b8>] (tty_port_open) from [<804dce64>] (uart_open+0x40/0x48)
[ 10.264254] [<804dce64>] (uart_open) from [<804c1d70>] (tty_open+0xc0/0x678)
[ 10.266697] [<804c1d70>] (tty_open) from [<802753f0>] (chrdev_open+0xe0/0x1a0)
[ 10.269049] [<802753f0>] (chrdev_open) from [<8026d964>] (do_dentry_open+0x1f4/0x314)
[ 10.271620] [<8026d964>] (do_dentry_open) from [<8026ec00>] (vfs_open+0x60/0x8c)
[ 10.275245] [<8026ec00>] (vfs_open) from [<8027f39c>] (path_openat+0x2bc/0x1040)
[ 10.312827] [<8027f39c>] (path_openat) from [<80281040>] (do_filp_open+0x70/0xd4)
[ 10.317860] [<80281040>] (do_filp_open) from [<8026efd8>] (do_sys_open+0x120/0x1d0)
[ 10.320370] [<8026efd8>] (do_sys_open) from [<8026f0b4>] (SyS_open+0x2c/0x30)
[ 10.357033] [<8026f0b4>] (SyS_open) from [<801080c0>] (ret_fast_syscall+0x0/0x1c)
Tracking that down in the linux kernel source, it looks like somehow uart_get_baud_rate() returns 0.
The same kernel could be booted without problem with qemu version 2.11.
Trying to bisecting the issue revealed commit @d9f8bbd8eb4e95db97cf02bd03af86a3d606f4f1 as the culprit.
Commandline to run was:
qemu-system-arm -M raspi2 \
-kernel "$KERNEL" \
-m 1024 \
-d guest_errors,unimp \
-dtb bcm2709-rpi-2-b.dtb \
-drive file="$IMG,if=sd,format=raw"
Distribution is SuSE tumbleweed (x86_64, kernel 4.17.2), but same problem also happens with a freshly compiled qemu from git repository.
|