On Mon, Nov 04, 2019 at 04:46:35PM +0800, kernel test robot wrote:

[   35.312661] BUG: kernel NULL pointer dereference, address: 00000000000005d8
[   35.316225] #PF: supervisor read access in kernel mode
[   35.319178] #PF: error_code(0x0000) - not-present page
[   35.322078] PGD 800000021b569067 P4D 800000021b569067 PUD 21b688067 PMD 0 
[   35.325629] Oops: 0000 [#1] SMP PTI
[   35.327965] CPU: 0 PID: 3148 Comm: trinity-c5 Not tainted 5.4.0-rc3-01107-g327fecdaf39ab #12
[   35.332863] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
[   35.337932] RIP: 0010:sctp_packet_transmit+0x767/0x822

Right, as asoc can be NULL by then. (per the check on it a few lines
before the change here).

  Marcelo