RHEL7/8: Kernel panic at bnxt_tx_int

Issue

• Kernel panic and unexpected reboot in bnxt_en driver function bnxt_tx_int, panic backtrace looks like one of:

[142691.543474] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
...
[142691.590583] RIP: 0010:bnxt_tx_int+0xe6/0x2a0 [bnxt_en]
...
[142691.706628] Call Trace:
[142691.709455]  <IRQ>
[142691.711790]  __bnxt_poll_work_done+0x23/0xd0 [bnxt_en]
[142691.717624]  bnxt_poll+0x55/0x190 [bnxt_en]
[142691.722393]  net_rx_action+0x149/0x3b0
[142691.726675]  __do_softirq+0xd7/0x2d6
[142691.730757]  irq_exit+0xf7/0x100
[142691.734455]  do_IRQ+0x7f/0xd0
[142691.737865]  common_interrupt+0xf/0xf
[142691.742048]  </IRQ>
[142691.744487] RIP: 0033:0x12b330c5

    [exception RIP: bnxt_tx_int+231]
    RIP: ffffffffc01eeb07  RSP: ffff9fe13fec3d90  RFLAGS: 00010246
    RAX: ffff9fe13b5c88c0  RBX: ffffa0613ec84098  RCX: 00000000000002ac
    RDX: ffffb3a6a3d22000  RSI: fffff681bc038480  RDI: 0000000040000000
    RBP: ffff9fe13fec3de0   R8: ffffa06100e12200   R9: 000000018020001b
    R10: 0000000000e13101  R11: ffffa06100e12200  R12: 00000000000000e5
    R13: ffffa0a131e70690  R14: ffffb3a6a3d23560  R15: 0000000000000000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#10 [ffff9fe13fec3de8] __bnxt_poll_work_done at ffffffffc01ee32c [bnxt_en]
#11 [ffff9fe13fec3e08] bnxt_poll at ffffffffc01f4c5e [bnxt_en]
#12 [ffff9fe13fec3e78] net_rx_action at ffffffffaf280037
#13 [ffff9fe13fec3ef8] __do_softirq at ffffffffaeca9545
#14 [ffff9fe13fec3f68] call_softirq at ffffffffaf3c8aac
#15 [ffff9fe13fec3f80] do_softirq at ffffffffaec30825
#16 [ffff9fe13fec3fa0] irq_exit at ffffffffaeca98f5
#17 [ffff9fe13fec3fb8] do_IRQ at ffffffffaf3c9ef6