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SubjectKCSAN BUG report on p9_client_cb / p9_client_rpc
I got this on rc7 + my hacks ( not near p9 )
ISTM someone here will know what it means.
If theres anything else i can do to help,
(configs, drop my patches and retry)
please let me know



[ 14.904783] ==================================================================
[ 14.905848] BUG: KCSAN: data-race in p9_client_cb / p9_client_rpc
[ 14.906769]
[ 14.907040] write to 0xffff888005eb0360 of 4 bytes by interrupt on cpu 0:
[ 14.907989] p9_client_cb+0x1a/0x100
[ 14.908485] req_done+0xd3/0x130
[ 14.908931] vring_interrupt+0xac/0x130
[ 14.909460] __handle_irq_event_percpu+0x64/0x260
[ 14.910095] handle_irq_event+0x93/0x120
[ 14.910637] handle_edge_irq+0x123/0x400
[ 14.911156] __common_interrupt+0x3e/0xa0
[ 14.911723] common_interrupt+0x7e/0xa0
[ 14.912270] asm_common_interrupt+0x1e/0x40
[ 14.912816] native_safe_halt+0xe/0x10
[ 14.913350] default_idle+0xa/0x10
[ 14.913801] default_idle_call+0x38/0xc0
[ 14.914361] do_idle+0x1e7/0x270
[ 14.914840] cpu_startup_entry+0x19/0x20
[ 14.915436] rest_init+0xd0/0xd2
[ 14.915878] arch_call_rest_init+0xa/0x11
[ 14.916428] start_kernel+0xacb/0xadd
[ 14.916927] secondary_startup_64_no_verify+0xc2/0xcb
[ 14.917613]
[ 14.917819] read to 0xffff888005eb0360 of 4 bytes by task 261 on cpu 1:
[ 14.918764] p9_client_rpc+0x1cf/0x860
[ 14.919340] p9_client_walk+0xcf/0x350
[ 14.919857] v9fs_file_open+0x16c/0x340
[ 14.920411] do_dentry_open+0x298/0x6a0
[ 14.920980] vfs_open+0x58/0x60
[ 14.921475] path_openat+0x1130/0x1860
[ 14.922126] do_filp_open+0x116/0x1f0
[ 14.922731] do_sys_openat2+0x91/0x190
[ 14.923267] __x64_sys_openat+0x9b/0xd0
[ 14.923790] do_syscall_64+0x42/0x80
[ 14.924295] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 14.924955]
[ 14.925159] Reported by Kernel Concurrency Sanitizer on:
[ 14.925899] CPU: 1 PID: 261 Comm: ip Not tainted
5.13.0-rc7-dd7i-00036-gb82eaba47adf-dirty #121
[ 14.927094] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.14.0-3.fc34 04/01/2014
[ 14.928292] ==================================================================
virtme-init: console is ttyS0

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