infiniband syz1: Couldn't open port 1
RDS/IB: syz1: added
smc: adding ib device syz1 with port count 1
smc:    ib device syz1 port 1 has no pnetid
==================================================================
BUG: KCSAN: data-race in rwsem_down_write_slowpath / rwsem_down_write_slowpath

write to 0xffffc9001179f098 of 1 bytes by task 3954 on cpu 1:
 rwsem_try_write_lock kernel/locking/rwsem.c:676 [inline]
 rwsem_down_write_slowpath+0x3eb/0xab0 kernel/locking/rwsem.c:1189
 __down_write_common kernel/locking/rwsem.c:1347 [inline]
 __down_write kernel/locking/rwsem.c:1356 [inline]
 down_write+0xad/0xc0 kernel/locking/rwsem.c:1632
 kernfs_add_one+0x5a/0x350 fs/kernfs/dir.c:825
 __kernfs_create_file+0x145/0x180 fs/kernfs/file.c:1079
 sysfs_add_file_mode_ns+0x132/0x1b0 fs/sysfs/file.c:316
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x43e/0x9e0 fs/sysfs/group.c:189
 internal_create_groups fs/sysfs/group.c:229 [inline]
 sysfs_create_groups+0x3f/0xf0 fs/sysfs/group.c:255
 setup_port drivers/infiniband/core/sysfs.c:1202 [inline]
 ib_setup_port_attrs+0xa2c/0x1480 drivers/infiniband/core/sysfs.c:1388
 add_one_compat_dev+0x297/0x390 drivers/infiniband/core/device.c:1002
 rdma_dev_init_net+0x1b9/0x240 drivers/infiniband/core/device.c:1227
 ops_init+0x22a/0x2e0 net/core/net_namespace.c:137
 setup_net+0x9f/0x230 net/core/net_namespace.c:443
 copy_net_ns+0x333/0x490 net/core/net_namespace.c:582
 create_new_namespaces+0x1f6/0x420 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0x115/0x150 kernel/nsproxy.c:234
 ksys_unshare+0x3fd/0x6f0 kernel/fork.c:3297
 __do_sys_unshare kernel/fork.c:3365 [inline]
 __se_sys_unshare kernel/fork.c:3363 [inline]
 __x64_sys_unshare+0x1f/0x30 kernel/fork.c:3363
 x64_sys_call+0x1e33/0x2550 arch/x86/include/generated/asm/syscalls_64.h:273
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffc9001179f098 of 1 bytes by task 3929 on cpu 0:
 rwsem_down_write_slowpath+0x462/0xab0 kernel/locking/rwsem.c:1207
 __down_write_common kernel/locking/rwsem.c:1347 [inline]
 __down_write kernel/locking/rwsem.c:1356 [inline]
 down_write+0xad/0xc0 kernel/locking/rwsem.c:1632
 kernfs_add_one+0x5a/0x350 fs/kernfs/dir.c:825
 __kernfs_create_file+0x145/0x180 fs/kernfs/file.c:1079
 sysfs_add_file_mode_ns+0x132/0x1b0 fs/sysfs/file.c:316
 create_files fs/sysfs/group.c:82 [inline]
 internal_create_group+0x43e/0x9e0 fs/sysfs/group.c:189
 internal_create_groups fs/sysfs/group.c:229 [inline]
 sysfs_create_groups+0x3f/0xf0 fs/sysfs/group.c:255
 setup_port drivers/infiniband/core/sysfs.c:1202 [inline]
 ib_setup_port_attrs+0xa2c/0x1480 drivers/infiniband/core/sysfs.c:1388
 add_one_compat_dev+0x297/0x390 drivers/infiniband/core/device.c:1002
 add_compat_devs drivers/infiniband/core/device.c:1060 [inline]
 enable_device_and_get+0x1cd/0x260 drivers/infiniband/core/device.c:1381
 ib_register_device+0x906/0xa80 drivers/infiniband/core/device.c:1503
 rxe_register_device+0x175/0x190 drivers/infiniband/sw/rxe/rxe_verbs.c:1549
 rxe_add+0x8e2/0x900 drivers/infiniband/sw/rxe/rxe.c:217
 rxe_net_add+0x62/0xb0 drivers/infiniband/sw/rxe/rxe_net.c:625
 rxe_newlink+0xdd/0x1a0 drivers/infiniband/sw/rxe/rxe.c:243
 nldev_newlink+0x3a8/0x430 drivers/infiniband/core/nldev.c:1858
 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:-1 [inline]
 rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
 rdma_nl_rcv+0x439/0x570 drivers/infiniband/core/netlink.c:259
 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline]
 netlink_unicast+0x5a9/0x680 net/netlink/af_netlink.c:1364
 netlink_sendmsg+0x5be/0x6f0 net/netlink/af_netlink.c:1919
 sock_sendmsg_nosec net/socket.c:800 [inline]
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0x532/0x580 net/socket.c:2713
 ___sys_sendmsg+0x195/0x1e0 net/socket.c:2767
 __sys_sendmsg net/socket.c:2799 [inline]
 __do_sys_sendmsg net/socket.c:2804 [inline]
 __se_sys_sendmsg net/socket.c:2802 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2802
 x64_sys_call+0x22ab/0x2550 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3929 Comm: syz.0.133 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================
syz.0.133 (3929) used greatest stack depth: 9032 bytes left