IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
sg_write: data in/out 91/78 bytes for SCSI command 0x0-- guessing data in;
   program syz-executor5 not setting count and/or reply_len properly
==================================================================
BUG: KMSAN: kernel-infoleak in copy_to_user include/linux/uaccess.h:184 [inline]
BUG: KMSAN: kernel-infoleak in copy_from_read_buf+0x311/0x890 drivers/tty/n_tty.c:1955
CPU: 0 PID: 6846 Comm: syz-executor6 Not tainted 4.17.0+ #21
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1437
 kmsan_internal_check_memory+0x17e/0x1f0 mm/kmsan/kmsan.c:1515
 kmsan_copy_to_user+0x7a/0x160 mm/kmsan/kmsan.c:1538
 copy_to_user include/linux/uaccess.h:184 [inline]
 copy_from_read_buf+0x311/0x890 drivers/tty/n_tty.c:1955
 n_tty_read+0x178f/0x2f70 drivers/tty/n_tty.c:2226
 tty_read+0x26e/0x6c0 drivers/tty/tty_io.c:865
 do_loop_readv_writev fs/read_write.c:700 [inline]
 do_iter_read+0x884/0xd80 fs/read_write.c:924
 vfs_readv fs/read_write.c:986 [inline]
 do_readv+0x295/0x5f0 fs/read_write.c:1019
 __do_sys_readv fs/read_write.c:1106 [inline]
 __se_sys_readv fs/read_write.c:1103 [inline]
 __x64_sys_readv+0xe1/0x120 fs/read_write.c:1103
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ba9
RSP: 002b:00007f1e18fe7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000013
RAX: ffffffffffffffda RBX: 00007f1e18fe86d4 RCX: 0000000000455ba9
RDX: 0000000000000001 RSI: 0000000020000080 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c098f R14: 00000000004d08c0 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:313 [inline]
 kmsan_internal_alloc_meta_for_pages+0x146/0x700 mm/kmsan/kmsan.c:842
 kmsan_alloc_page+0x75/0xd0 mm/kmsan/kmsan.c:1140
 __alloc_pages_nodemask+0xf7b/0x5cc0 mm/page_alloc.c:4404
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 __vmalloc_area_node mm/vmalloc.c:1702 [inline]
 __vmalloc_node_range+0x8bf/0x1170 mm/vmalloc.c:1767
 __vmalloc_node mm/vmalloc.c:1812 [inline]
 __vmalloc_node_flags mm/vmalloc.c:1826 [inline]
 vmalloc+0xd8/0xf0 mm/vmalloc.c:1848
 n_tty_open+0x4a/0x490 drivers/tty/n_tty.c:1881
 tty_ldisc_open drivers/tty/tty_ldisc.c:466 [inline]
 tty_ldisc_setup+0x17f/0x670 drivers/tty/tty_ldisc.c:771
 tty_init_dev+0xb82/0x1020 drivers/tty/tty_io.c:1345
 ptmx_open+0x2bb/0x7c0 drivers/tty/pty.c:832
 chrdev_open+0xc25/0xd90 fs/char_dev.c:417
 do_dentry_open+0xccc/0x1440 fs/open.c:794
 vfs_open+0x1b6/0x2f0 fs/open.c:908
 do_last fs/namei.c:3365 [inline]
 path_openat+0x4771/0x6640 fs/namei.c:3506
 do_filp_open+0x261/0x640 fs/namei.c:3540
 do_sys_open+0x624/0x960 fs/open.c:1101
 __do_sys_openat fs/open.c:1128 [inline]
 __se_sys_openat fs/open.c:1122 [inline]
 __x64_sys_openat+0x129/0x170 fs/open.c:1122
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Byte 4094 of 4095 is uninitialized
Memory access starts at ffffc900124a105e
==================================================================