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BUG: KMSAN: uninit-value in xas_start lib/xarray.c:190 [inline]
BUG: KMSAN: uninit-value in xas_load lib/xarray.c:233 [inline]
BUG: KMSAN: uninit-value in xa_load+0xa59/0xa90 lib/xarray.c:1305
CPU: 1 PID: 15638 Comm: syz-executor.2 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 xas_start lib/xarray.c:190 [inline]
 xas_load lib/xarray.c:233 [inline]
 xa_load+0xa59/0xa90 lib/xarray.c:1305
 _ucma_find_context drivers/infiniband/core/ucma.c:139 [inline]
 ucma_get_ctx+0x82/0x3b0 drivers/infiniband/core/ucma.c:152
 ucma_get_ctx_dev drivers/infiniband/core/ucma.c:175 [inline]
 ucma_accept+0x29a/0xe40 drivers/infiniband/core/ucma.c:1148
 ucma_write+0x64d/0x6e0 drivers/infiniband/core/ucma.c:1764
 do_loop_readv_writev fs/read_write.c:737 [inline]
 do_iter_write+0x9b1/0x1020 fs/read_write.c:1020
 vfs_writev fs/read_write.c:1091 [inline]
 do_writev+0x4cc/0xa30 fs/read_write.c:1134
 __do_sys_writev fs/read_write.c:1207 [inline]
 __se_sys_writev+0x9b/0xb0 fs/read_write.c:1204
 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1204
 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5f9
Code: Bad RIP value.
RSP: 002b:00007f74ae529c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000039c40 RCX: 000000000045d5f9
RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000005
RBP: 000000000118d0c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118d08c
R13: 000000000169fb6f R14: 00007f74ae52a9c0 R15: 000000000118d08c

Local variable ----cmd@ucma_accept created at:
 ucma_accept+0x91/0xe40 drivers/infiniband/core/ucma.c:1137
 ucma_accept+0x91/0xe40 drivers/infiniband/core/ucma.c:1137
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