===================================================== BUG: KMSAN: uninit-value in __radix_tree_lookup lib/radix-tree.c:758 [inline] BUG: KMSAN: uninit-value in radix_tree_lookup+0x409/0x420 lib/radix-tree.c:818 CPU: 1 PID: 6663 Comm: syz-executor.4 Not tainted 5.9.0-rc8-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:122 __msan_warning+0x55/0x90 mm/kmsan/kmsan_instr.c:201 __radix_tree_lookup lib/radix-tree.c:758 [inline] radix_tree_lookup+0x409/0x420 lib/radix-tree.c:818 qrtr_tx_resume net/qrtr/qrtr.c:224 [inline] qrtr_endpoint_post+0x1172/0x1700 net/qrtr/qrtr.c:498 qrtr_tun_write_iter+0x216/0x370 net/qrtr/tun.c:92 call_write_iter include/linux/fs.h:1882 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0xfba/0x1870 fs/read_write.c:586 ksys_write+0x2af/0x4d0 fs/read_write.c:639 __do_sys_write fs/read_write.c:651 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:648 __x64_sys_write+0x4a/0x70 fs/read_write.c:648 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45de59 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0c7f52cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000003aec0 RCX: 000000000045de59 RDX: 00000000000000e4 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 000000000169fb7f R14: 00007f0c7f52d9c0 R15: 000000000118bf2c Uninit was created at: kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:143 kmsan_alloc_page+0xce/0x1d0 mm/kmsan/kmsan_shadow.c:278 __alloc_pages_nodemask+0x84e/0x1040 mm/page_alloc.c:4938 __alloc_pages include/linux/gfp.h:509 [inline] __alloc_pages_node include/linux/gfp.h:522 [inline] alloc_pages_node include/linux/gfp.h:536 [inline] __page_frag_cache_refill mm/page_alloc.c:5011 [inline] page_frag_alloc+0x35b/0x890 mm/page_alloc.c:5041 __napi_alloc_skb+0x1c0/0xab0 net/core/skbuff.c:519 napi_alloc_skb include/linux/skbuff.h:2865 [inline] page_to_skb+0x142/0x1640 drivers/net/virtio_net.c:384 receive_mergeable+0xedd/0x5cd0 drivers/net/virtio_net.c:944 receive_buf+0x2db/0x2ba0 drivers/net/virtio_net.c:1054 virtnet_receive drivers/net/virtio_net.c:1346 [inline] virtnet_poll+0xa51/0x1d10 drivers/net/virtio_net.c:1451 napi_poll+0x4aa/0x1090 net/core/dev.c:6688 net_rx_action+0x35c/0xd40 net/core/dev.c:6758 __do_softirq+0x1b9/0x7ed kernel/softirq.c:299 =====================================================