syzbot

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BUG: KCSAN: data-race in addr_resolve / rdma_resolve_addr

write to 0xffff888141967d84 of 4 bytes by task 833 on cpu 0:
 rdma_copy_src_l2_addr drivers/infiniband/core/addr.c:241 [inline]
 copy_src_l2_addr drivers/infiniband/core/addr.c:484 [inline]
 rdma_set_src_addr_rcu drivers/infiniband/core/addr.c:523 [inline]
 addr_resolve+0x55a/0xda0 drivers/infiniband/core/addr.c:597
 process_one_req+0xac/0x2f0 drivers/infiniband/core/addr.c:631
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
 worker_thread+0x525/0x730 kernel/workqueue.c:2784
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

write to 0xffff888141967d84 of 4 bytes by task 3184 on cpu 1:
 cma_bind_addr drivers/infiniband/core/cma.c:4057 [inline]
 resolve_prepare_src drivers/infiniband/core/cma.c:4080 [inline]
 rdma_resolve_addr+0x4cb/0x1280 drivers/infiniband/core/cma.c:4109
 ucma_resolve_ip+0x13f/0x1c0 drivers/infiniband/core/ucma.c:695
 ucma_write+0x1a5/0x230 drivers/infiniband/core/ucma.c:1744
 vfs_write+0x27a/0x7d0 fs/read_write.c:582
 ksys_write+0xeb/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x42/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x0000000b

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3184 Comm: syz-executor.3 Tainted: G        W          6.6.0-rc1-syzkaller-00240-gf0b0d403eabb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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