Dmitry Safonov <dima@xxxxxxxxxx> wrote: > bindex can be out of BA window (64): > tid 0 seq 2983, start_seq 2915, bindex 68, index 39 > tid 0 seq 2984, start_seq 2915, bindex 69, index 40 > tid 0 seq 2985, start_seq 2915, bindex 70, index 41 > tid 0 seq 2986, start_seq 2915, bindex 71, index 42 > tid 0 seq 2879, start_seq 2915, bindex 4060, index 63 > tid 0 seq 2854, start_seq 2915, bindex 4035, index 38 > tid 0 seq 2795, start_seq 2915, bindex 3976, index 43 > tid 0 seq 2989, start_seq 2924, bindex 65, index 45 > tid 0 seq 2992, start_seq 2924, bindex 68, index 48 > tid 0 seq 2993, start_seq 2924, bindex 69, index 49 > tid 0 seq 2994, start_seq 2924, bindex 70, index 50 > tid 0 seq 2997, start_seq 2924, bindex 73, index 53 > tid 0 seq 2795, start_seq 2941, bindex 3950, index 43 > tid 0 seq 2921, start_seq 2941, bindex 4076, index 41 > tid 0 seq 2929, start_seq 2941, bindex 4084, index 49 > tid 0 seq 3011, start_seq 2946, bindex 65, index 3 > tid 0 seq 3012, start_seq 2946, bindex 66, index 4 > tid 0 seq 3013, start_seq 2946, bindex 67, index 5 > > In result isset() will try to dereference something on the stack, > causing panics: > BUG: unable to handle page fault for address: ffffa742800ed01f > #PF: supervisor read access in kernel mode > #PF: error_code(0x0000) - not-present page > PGD 6a4e9067 P4D 6a4e9067 PUD 6a4ec067 PMD 6a4ed067 PTE 0 > Oops: 0000 [#1] PREEMPT SMP PTI > CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Not tainted 5.8.5-arch1-1-kdump #1 > Hardware name: Apple Inc. MacBookAir3,1/Mac-942452F5819B1C1B, BIOS MBA31.88Z.0061.B07.1201241641 01/24/12 > RIP: 0010:brcms_c_ampdu_dotxstatus+0x343/0x9f0 [brcmsmac] > Code: 54 24 20 66 81 e2 ff 0f 41 83 e4 07 89 d1 0f b7 d2 66 c1 e9 03 0f b7 c9 4c 8d 5c 0c 48 49 8b 4d 10 48 8b 79 68 41 57 44 89 e1 <41> 0f b6 33 41 d3 e0 48 c7 c1 38 e0 ea c0 48 83 c7 10 44 21 c6 4c > RSP: 0018:ffffa742800ecdd0 EFLAGS: 00010207 > RAX: 0000000000000019 RBX: 000000000000000b RCX: 0000000000000006 > RDX: 0000000000000ffe RSI: 0000000000000004 RDI: ffff8fc6ad776800 > RBP: ffff8fc6855acb00 R08: 0000000000000001 R09: 00000000000005d9 > R10: 00000000fffffffe R11: ffffa742800ed01f R12: 0000000000000006 > R13: ffff8fc68d75a000 R14: 00000000000005db R15: 0000000000000019 > FS: 0000000000000000(0000) GS:ffff8fc6aad00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffa742800ed01f CR3: 000000002480a000 CR4: 00000000000406e0 > Call Trace: > <IRQ> > brcms_c_dpc+0xb46/0x1020 [brcmsmac] > ? wlc_intstatus+0xc8/0x180 [brcmsmac] > ? __raise_softirq_irqoff+0x1a/0x80 > brcms_dpc+0x37/0xd0 [brcmsmac] > tasklet_action_common.constprop.0+0x51/0xb0 > __do_softirq+0xff/0x340 > ? handle_level_irq+0x1a0/0x1a0 > asm_call_on_stack+0x12/0x20 > </IRQ> > do_softirq_own_stack+0x5f/0x80 > irq_exit_rcu+0xcb/0x120 > common_interrupt+0xd1/0x200 > asm_common_interrupt+0x1e/0x40 > RIP: 0010:cpuidle_enter_state+0xb3/0x420 > > Check if the block is within BA window and only then check block's > status. Otherwise as Behan wrote: "When I came back to Dublin I > was courtmartialed in my absence and sentenced to death in my absence, > so I said they could shoot me in my absence." > > Also reported: > https://bbs.archlinux.org/viewtopic.php?id=258428 > https://lore.kernel.org/linux-wireless/87tuwgi92n.fsf@xxxxxxxxxxxxx/ > > Reported-by: Yuji Nakao <contact@xxxxxxxxxxxxx> > Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx> Patch applied to wireless-drivers-next.git, thanks. 01c195de620b brcmsmac: ampdu: Check BA window size before checking block ack -- https://patchwork.kernel.org/project/linux-wireless/patch/20201116030635.645811-1-dima@xxxxxxxxxx/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
