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The following backtrace is caused by original vizzini-1.1-enable-cts.patch
WARNING: CPU: 0 PID: 1030 at drivers/usb/core/hcd.c:1495 usb_hcd_map_urb_for_dma+0x3c0/0x480
transfer buffer is on stack
Modules linked in: mts_io(O) xt_time xt_tcpudp xt_state xt_set xt_recent xt_policy xt_nat xt_multiport xt_mark xt_mac xt_limit xt_l2tp xt_iprange xt_hl xt_hashlimit xt_esp
ip6t_ipv6header ip6t_hbh ip6t_frag ip6t_eui64 ip6t_ah ip6t_SYNPROXY nf_synproxy_core ip6t_REJECT nf_reject_ipv6 ip6t_NPT x_tables ip6_vti ip6_gre ip6_tunnel dns_resolver
CPU: 0 PID: 1030 Comm: gpsctl Tainted: G O 5.4.81 #1
Hardware name: Atmel AT91SAM9
[<c000ffc4>] (unwind_backtrace) from [<c000d4c8>] (show_stack+0x10/0x14)
[<c000d4c8>] (show_stack) from [<c00195c8>] (__warn+0xb8/0xcc)
[<c00195c8>] (__warn) from [<c0019644>] (warn_slowpath_fmt+0x68/0x7c)
[<c0019644>] (warn_slowpath_fmt) from [<c036ed40>] (usb_hcd_map_urb_for_dma+0x3c0/0x480)
[<c036ed40>] (usb_hcd_map_urb_for_dma) from [<c036fe28>] (usb_hcd_submit_urb+0x8c4/0x940)
[<c036fe28>] (usb_hcd_submit_urb) from [<c03725e4>] (usb_start_wait_urb+0x44/0x130)
[<c03725e4>] (usb_start_wait_urb) from [<c037276c>] (usb_control_msg+0x9c/0xd0)
[<c037276c>] (usb_control_msg) from [<bf096528>] (vizzini_get_reg+0x4c/0x60 [vizzini])
[<bf096528>] (vizzini_get_reg [vizzini]) from [<bf0967e4>] (xr21v141x_tty_set_termios+0x130/0x344 [vizzini])
[<bf0967e4>] (xr21v141x_tty_set_termios [vizzini]) from [<c0285598>] (tty_set_termios+0x168/0x1e0)
[<c0285598>] (tty_set_termios) from [<c0285c70>] (set_termios+0x258/0x2ec)
[<c0285c70>] (set_termios) from [<c028601c>] (tty_mode_ioctl+0x1c4/0x424)
[<c028601c>] (tty_mode_ioctl) from [<c0280f14>] (tty_ioctl+0x90c/0x980)
[<c0280f14>] (tty_ioctl) from [<c00e45d0>] (vfs_ioctl+0x24/0x3c)
[<c00e45d0>] (vfs_ioctl) from [<c00e4eb0>] (do_vfs_ioctl+0x94/0x6f4)
[<c00e4eb0>] (do_vfs_ioctl) from [<c00e5560>] (ksys_ioctl+0x50/0x68)
[<c00e5560>] (ksys_ioctl) from [<c0009000>] (ret_fast_syscall+0x0/0x50)
Exception stack(0xc5ce1fa8 to 0xc5ce1ff0)
1fa0: 00000000 00000003 00000003 00005402 beeb8c04 00000000
1fc0: 00000000 00000003 000121d0 00000036 00000000 00000000 b6fe4fa4 beeb8c74
1fe0: 00000010 beeb8c00 00000000 b6e1e890
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